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Posted by dmrcflyr2 | Sep 25, 2016 @ 11:26 AM | 4,730 Views
I just so happen to have two old school heavy weights from the late 80's-early 90's in my possession. The first is from 1989, the OS FS-120E Surpass and the second is from about the same time period, the Saito FA-120S DP.

The latter is my personal engine and the former is a good friend of mines. Both have been overhauled with new bearings, timing set, and TLC provided. The OS could be for sale, but Rob might decide he wants to keep it. The Saito, will not be sold. But that isn't the purpose of this post.

I thought head to head runs under the same circumstances would be a fun thing to do today. Both were swinging the same Master Airscrew 15x8 prop, drinking the same brew Morgan's 5% Omega with castor added, and firing with an OS F glow plug. Both engines had been run prior to what is seen in the video, both tuned more or less perfectly.

As you can see below the Saito outweighs the Surpass by 2.2 ounces. The Saito comes in at 32.5 ounces and the OS is at 30.3 ounces. The video shows that the Saito out turns the OS as well; to the order of 750 RPM at WOT.

Saito Max 8670 RPM Min 2250 RPM
OS Max 7920 RPM Min 2550 RPM

Granted the low end RPM figures could be tuned to be lower but most folks aren't looking for how slowly an engine can swing a prop. The OS really could not be tweaked to provide any higher RPM, the next click of the needle resulted in a drop in RPM. The Saito, well I did not try to get more out of it.

Saito FA-120S vs OS FS-120 Surpass Comparison Run (7 min 3 sec)

Posted by dmrcflyr2 | Sep 24, 2016 @ 01:50 PM | 5,150 Views
When I saw this engine listed on eBay I knew I had to have it. The ad stated that it was new and the three pictures in the ad were not that clear. I sent a question attempting to confirm the condition. I got a response stating that the muffler was new, no carbon residue and no smell. I pulled the trigger as these are HARD to find, especially new. The price was $212 shipped.

Well when the engine arrived, it took all of 5 seconds to figure out that it was NOT new and never run. Holy hell! What have a done now? I asked. I made some videos, as I always do to document the condition. I sent a message to the seller explaining the condition issues and 3 days later I got a response. My request of a 50% refund for a non-new engine was granted. Oh, I forgot to mention, the engine was LOCKED up also. It would not turn over at all!

Well I was much happier knowing I just scored a Saito FA-120S DP for $112. I knew I could fix it and, I did. The end result was it just needed some cleanup and a new set of bearings.

Here is the video I made if it running today. It is a very nice $112 engine and one I will keep for many years.

The other disassembly videos are located on my YouTube channel.

Saito FA-120S DP The First Runs (12 min 59 sec)

Posted by dmrcflyr2 | Sep 11, 2016 @ 01:56 PM | 1,327 Views
...but a serious MF. This is an engine sent to me by a friend along with many other engines. The intent was to clean up, play with, make videos and then sell them. Well I have made it through many of his engines, but this one is a bit special. It is a Thunder Tiger Pro 120 two stroke engine. Now when it arrived it looked quite new with little run time. The only issues was that it was very tight turning it over when a propeller was installed.

I tore this engine down, pulled the new bearings and gave it a thorough inspection. When I re-installed the bearings, I made a stupid mistake too. I 'assumed' that the front bearing was fully seated when flush with the front housing. This was how I installed the front bearing using my arbor press. The crankshaft felt great and smooth before the piston was re-installed. It still felt great afterward, but it was a different story when the propeller was attached and tightened down. Eventually I dis-assembled the engine again and found a perfectly sized socket that would fit the outer race. It certainly seated another .5mm-1mm after that using the press. Issue resolved, dumb mistake made, lesson learned.

Now to run this thing! That was and is the largest 2 stroke engine I have ever attempted to run. Honestly I wasn't sure it would fit in my PSP test stand, but, luckily for me, it did. Well run it did! It has been one of the most fun engine runs I have had in a long time! The thing is big, scary, and powerful! I...Continue Reading
Posted by dmrcflyr2 | Sep 10, 2016 @ 09:22 AM | 1,585 Views
I bought this engine here for a mere $15 shipped. It was new, never run and without a muffler. I bought it as a piece to experiment with. It has proven to be much more resilient than I thought. See the full story in video.
Posted by dmrcflyr2 | Sep 05, 2016 @ 08:25 AM | 1,924 Views
I have a YouTube subscriber who has shown me some videos of a home brew fuel he makes with only Ethanol and castor oil. Where he lives in Germany pre-mixed glow fuel with nitromethane is quite expensive if even available. I have tossed around the idea of mixing my own fuel before, but never did because it really just isn't cost effective. I have a LHS that still stocks fuel at a decent price so why mix my own?

Well for an experiment I decided to mix some and try it out. This is the 'what if' scenario. What if all of my LHS closed the doors? What if I could not get pre-mixed glow fuel anymore? Well in this experiment I get an answer to the 'what if' question.

I went to Home Depot and bought a 1 quart can of Klean Strip Denatured alcohol. In addition I already have some Klotz BeNOL racing castor. I simply mixed 6.4oz of alcohol to 1.6oz of castor in a mason jar. I then just filled an 8oz fuel tank with this and selected two engines to run.

I choose my OS FS-30 Surpass and an OS 46 SF engine. I figured one 4 stroke and one 2 stroke would be a good starting point.

Well watch the video to see the results. It is quite interesting.
Home Brew Fuel Experiment: My 401st Video! (10 min 9 sec)

Posted by dmrcflyr2 | Sep 03, 2016 @ 06:13 AM | 1,319 Views
I bought this engine from eBay, paid a bit more than I should have, but hey I'm planning on keeping it so.... It looked pretty decent on the outside. it was missing a few items that added to the overall cost to me, prop washer, muffler, bearings, and the needle valve assembly needed to be replaced. Fortunately I had a replacement needle valve assembly on hand. I also ordered some gaskets, retaining nuts for the muffler and an O-ring.

Once I opened her up I saw how dirty the inside was! It took some time but I got it done and now she is a beautiful and fine running engine once again. See the story in video here.
Posted by dmrcflyr2 | Aug 16, 2016 @ 05:33 AM | 1,804 Views
I have had my YouTube channel for about 2 years now. I started it when I was searching YouTube for videos of engines I wanted to run, or was just curious about. After some searching I really did not find a single channel that had a consistent format and a wide variety of engine videos. So I started making my own.

They started out pretty crude but I think I have gotten better at it over time. Now I have over 370 videos on my channel. These range from nearly 100 instructional videos covering topics such as:

- Disassembly of a 2 and 4 stroke engines.
- How to set the timing on 4 stroke engines.
- How to replace the bearings on engines.
- How to adjust the valve lash on 4 stroke engines
- Tuning and setup of both 2 and 4 stroke engines

I also have a section on "Box to the Bench" reviews. this is where I run an engine straight as it came to me from a seller. Now I assess the engine externally first to ensure it is in running condition. Then afterward I usually tear it down for inspection and cleaning.

That leads to my "A Look Inside" videos. Here I disassemble the engine to inspect the components, and I attempt to guess the amount of run time an engine has on it based on internal condition. Sometimes I have quite surprising finding too. Most often it leads to a bearing replacement. Once this section is complete I make a first run after reassembly video or a Performance Run. these generally are the...Continue Reading
Posted by dmrcflyr2 | Aug 09, 2016 @ 06:17 PM | 2,368 Views
Seeing as I have several 50 size 4 stroke engines, 4 to be exact, how about putting a couple more head to head? My last 50 size comparison was when I ran the Magnum XL52RFS vs the OS FS-48 Surpass.

This time I will put my newest acquisition, an HP 49 VT, against a rebuild project engine a Saito FA-50. I just finished re-assembling the Saito 50 and up next for it will be a performance run. So why not add another video of the HP running with it? Both will be running Morgan's 5% Omega with castor added for a total lube content of 20%. Both will be turning APC 11x6 propellers.

Here are a few pictures of the contenders.
Posted by dmrcflyr2 | Aug 07, 2016 @ 12:13 PM | 3,908 Views
A friend of mine and an awesome member here, Balsaworkbench, was kind enough to send me 2 boxes of engines. Box 1 has arrived and box 2 will be here tomorrow.

Inside box #1 were a variety of engines but three in particular to be discussed here. They are an OS 10 FSR, an OS 10 FP, and an Enya 09 MK IV. I am excited about these engines as they will be the smallest engines I have ever run. I did A Look Inside the OS 10 FSR and the Enya 09(Just added link) to assess the condition of these engines. I did tear down the 10 FP also but I did not shoot a video of that.

With that said the engines are all cleaned up and ready to run. Fortunately Rob also sent three 7x4 propellers with these engines as I do not have props that size. This comparison will be done with these three engines running the 7x4 props. I have not decided which fuel I will be running but most likely it will be the Omega 5% with additional castor added.

Unfortunately this will not be taking place until next weekend as there is a low pressure system off the coast providing constant rain showers. This system is expected to hang around all week dropping tons of rain. So stay tuned for this next comparison.

OS 10 FSR A Look Inside (8 min 26 sec)

Enya 09 Mk IV a Look Inside (13 min 31 sec)
...Continue Reading
Posted by dmrcflyr2 | Aug 06, 2016 @ 07:05 AM | 1,889 Views
Well it runs! Obviously I wasn't as prepared as I should have been. I really just wanted to see if it would pop over. Well it did, the first flip!

More to come.

I have added videos. They can be viewed in this playlist.

HP VT 49 The first run. (3 min 39 sec)

Posted by dmrcflyr2 | Aug 05, 2016 @ 04:34 PM | 2,024 Views
Well every since I have been in the hobby dating back to 1988, I have been intrigued by the HP VT 4 stroke engines but have never owned one.......UNTIL NOW! Can you tell I'm excited?

The ad did not show a box nor was one mentioned so I wasn't expecting one, but it came in one! Now I have had an HP .40 2 stroke Gold Cup engine before, but never one of these. HP usually uses the same artwork design on their boxes with just a sticker denoting what is inside. Now looking at the review from 1983 on the VT-21 I don't think this engine is that old. It is an Austrian made engine and I am not sure what year MECOA took over this engine line, but the exhaust does not look like the ones from the initial release of these engines.

I do plan on keeping this engine, it isn't going to cycle through my collection regardless of how it runs. I hope to get a video of it running very soon too. I need to look at and read the manual I found on the MECOA site or see if I can find an original manual.

Here are the pictures....Continue Reading
Posted by dmrcflyr2 | Aug 04, 2016 @ 06:32 PM | 2,362 Views
Well after some discussion with my subscriber that suggested this comparison, he has decided to narrow down the choices. This concluding segment features only the Saito and Magnum engines running 10x6 propellers and the FAI fuel. These were the choices due to the availability of these engines at his local hobby store.

I know, right? How cool is that? I haven't seen a 4 stroke engine IN STOCK on the SHELF in my LHS in several years. Well his shop must be pretty cool.

I tried doing these runs Tuesday night but had nothing but problems. Neither engine wanted to run for crap, they were getting hot very fast resulting in very erratic WOT RPM. The idle needle on the Magnum on this engine is so loose that it vibrated closed resulting in the engine dying at 1/4 throttle. I had to remove it and wrap it with teflon tape to add some friction.

Then my electric starter cone kept coming loose. Basically nothing was going right. Tonight, however, was a different story. I ran both engines and they ran great. Check it out.

30 Size 4 stroke comparison Segment 2 (14 min 37 sec)

Posted by dmrcflyr2 | Jul 30, 2016 @ 10:22 AM | 2,687 Views
The 30 size 4 stroke comparison begins in earnest now. Today's videos are Parts 1 and 2 of Segment 1 of the comparison. Due to the length and amount of runs it had to be broken down into two parts.

I run the four engines, Saito FA-30S, Magnum XL30RFS, OS FS-30S, and the OS FS-26 Surpass, with a Xoar 10x4 prop. I perform two runs with each engine using two different fuels. Omega 5% with Klotz castor added for a total of 20% lubrication and Omega FAI 0% nitro and 17% total lubrication.

Weather conditions at the time of testing this morning was 82 degrees F and 79% humidity. Yes, I was melting by the end of the runs.

This is the first time I have ever run a Xoar prop and I will remember it well. I got popped and split open right through a leather glove on the second or third flip. You'll see it in the video.

I plan on doing more engine comparisons in the near future. On tap will be a 2 stroke 40 and 46 size shoot out.


Part 1 of Segment 1
30 Size 4 stroke comparison Part 1 of Segment 1 (9 min 43 sec)

Part 2 of Segment 1
30 Size 4 stroke comparison Part 2 of Segment 1 (10 min 28 sec)
...Continue Reading
Posted by dmrcflyr2 | Jul 22, 2016 @ 06:10 PM | 2,995 Views
I am waiting for the final engine to arrive before beginning this in earnest. I will be conducting a 30 size 4 stroke engine shoot out. Basically comparing RPM figures with various props and various fuels. The engines to be included are:

Saito FA-30S
Magnum XL30RFS
OS FS-26 Surpass

This request was originally an idea from a YouTube subscriber in Germany who is trying to decide on a power plant for his WWI Air Combat airframe. he is building a Nieuport 28. Following the rules in the attached document. It sounds like a really cool competition.

I already have the 26 Surpass and the Magnum XL30, but the Saito FA-30S just arrived today. I immediately began the break in of this engine in preparation for the shoot out. The OS FS-30 should arrive on Monday.

Since I cannot enter a table here I just made a screen shot of the test matrix. Basically I plan on running each engine using at minimum a 10x4 prop, as dictated by the WWI combat rules, and probably a few others for Min/Max RPM. I will run this test on several different fuels as well focusing on the FAI as that is easily available in Germany.

Omega 10%
Omega 5%
Omega Control Line 10%
Omega FAI 0%

In preparation for the shoot out I tested out a multiple tachometer setup today too. I have been less than impressed with the GloBee tach I have been using lately. The Tower Hobbies one I have is equally crappy. I have since ordered a Hobby King unit and hope it performs a bit better.

That little Saito is one sweet engine for sure!
Saito FA-30S multiple tach setup (12 min 11 sec)

Posted by dmrcflyr2 | Jul 19, 2016 @ 03:24 PM | 2,941 Views
Well the idle screw that was missing from my latest Magnum XL52 engine finally arrived. It should have arrived yesterday as the USPS status was 'Out for Delivery'. Well it did not show up. Tracking this morning showed it went back to Tampa and then to Sarasota last night. WTH? This morning it showed 'Arrived at post office' in Largo at 7:09AM but not 'Out for Delivery'. I happened to be home and intercepted the Mail person and just as I was about to begin an inquisition I see her pull up an mailing envelope that could only be the idle screw. Finally.

Now with the screw installed to an approximate setting as my other Magnum, I strapped it to the test stand. Needle valve open 2 full turns, new OS F plug installed, tank filled, ready to fire her up. She popped on the first touch of the prop and the second flip she was purring away.

Whatever ill will I had towards Chinese made engines once again began to slip away as I advanced the throttle. This engine is sweet to say the least. Now I have no doubt that SOME Magnum/ASP engines are dogs, but I have been fortunate lately. I would not hold back my feelings on this. These two XL 52's I have are really well behaved nice running engines.

Just like the two ASP FS 80's I have had in the last month, these are nice engines. Check it out for yourself.

Magnum XL52RFS first run after a look inside (9 min 2 sec)

Posted by dmrcflyr2 | Jul 17, 2016 @ 04:46 PM | 2,776 Views
I began the break in of a NIB Magnum engine today. This is an engine I purchased here on RCG. It is the second XL30 I have owned. I have read very mixed reviews about this particular engine as far as quality issues and running performance. Now the first one I had I was unable to ever get it to hand start. Eventually I sold the engine. Aside from the non hand starting it was a good running engine. I replaced it with an OS FS-30 which hands down is a superior engine.

When I saw this one NIB for a price I was willing to pay I jumped on it. Today I began the break in of this engine. From my past experience I had reservations about whether or not I could hand start it on the first tank of fuel. Now one of the issues with this engine, and other Magnum engines, is the lack if a throttle stop screw. This makes it a bit harder to determine when the throttle barrel is open enough for starting. That was my issue again today and after a few flips I resorted to the electric starter.

After several tanks of fuel I was able to hand start this engine and the break in is well underway. The first video of the initial run is somewhat boring as I kept it at a constant rich setting. I have attached the video montage of subsequent runs. It seems to be a really nice running engine.

Magnum XL30FS Break in clips (7 min 54 sec)

Posted by dmrcflyr2 | Jul 16, 2016 @ 06:04 PM | 3,063 Views
So as I stated several posts ago, this is the first K&B engine I have owned. I am both impressed and disappointed in this engine. Let me explain. I ran it today for the first time. It would not hand start which is not entirely surprising, but it did leak fuel, badly.

Once I got it started with the electric starter I ran it quite rich as the instructions mention. I saw tons of fuel leaking from the rear of the head. Initially I thought, hoped, it was coming from the carb inlet. Well that did not turn out to be the case. It was coming from the top of the head, as seen in the videos, and running down the back of the engine pooling up in the rear of the back plate. Now the impressive part of this is that the engine was running well the entire time! I mean once I got it started, it never missed a beat. It would idle well and transition to WOT was good. The engine runs good.

So after the first two runs I took it inside and opened it up looking for some gross manufacturing defects that would be the cause of this leakage. I shot a video of that too. Well I really didn't find anything unusal but I did apply some Permatex motoseal 1 ultimate gasket maker grey around the mating surface of the top head piece. After re-assembly I ran the engine again, again I shot a video, and the fix seemed to work.

There are 3 videos linked to this post. Watch them all if you want to see the progression of the first runs, dis-assembly, and subsequent run of this engine.

K&B Sportster 20 The first runs (11 min 49 sec)

K&B Sportster 20 A Look Inside (8 min 15 sec)

K&B Sportster 20 Run after sealing leaks (8 min 11 sec)

Posted by dmrcflyr2 | Jul 15, 2016 @ 08:25 PM | 3,369 Views
I take a look inside this newly acquired used engine. This was going to be a Box to the Bench review video, but the initial inspection upon arrival showed the carb was missing the idle adjustment screw. The throttle arn was pretty badly bent as well but that is an easy fix. I have an idle screw on order and thus this video review instead.
Magnum XL52FS A Look Inside (15 min 0 sec)

Posted by dmrcflyr2 | Jul 13, 2016 @ 06:01 PM | 3,080 Views
For those that follow my blog you might be surprised by this news. I just bought my FIRST K&B engine! I purchased a K&B Sportster 20 from a fellow member here. Yes, after 28 years in the hobby, this is the first time I have ever owned a K&B engine.

I cannot say that there was ever really a reason for that other than personal choice. I have always favored the Japanese made engines but have owned numerous Chinese made engine too. I cannot say that I am on the K&B 'band wagon' or anything. This choice was really one of needing to try something new, and timing. I would never buy a used K&B engine but a NIB one was worth the risk.

Being a Made in the USA engine I wasn't expecting Japanese quality externally, and I wasn't disappointed. Sure it isn't the same high quality casting as seen from overseas, but it is pretty nice. I have no complaints about it. Judging by the date on the documentation this looks to be a vintage 1997 engine. I wasn't all that thrilled about the simple brass remote needle valve holder, but it should work fine.

The two piece exhaust system should be interesting. I think I will put a drop of semi-permanent loctite on the screws to keep this thing together.

The real test will come when I get around to running it. I will use the supplied glow plug and either Morgan's Omega 10% or FAI 0% for fuel.

Another reason I chose this particular engine as my first K&B dates back to my entrance into the hobby in...Continue Reading
Posted by dmrcflyr2 | Jul 03, 2016 @ 08:14 AM | 7,526 Views
Seeing as I now have a gallon of this Omega FAI fuel I thought I would run another engine on it. Now yesterday I pulled my old school open rocker FA-50 out and put a tank of fuel through it. The run yesterday was done using my standard Omega 10%. The engine ran fantastic! It is one of my favorite engines for sure, four stroke that is.

Anyway this morning I tried several different things. The first being to run this engine on the FAI fuel as a comparison. I use the exact same glow plug and prop; Hangar 9 four stroke and APC 11x6.

I recorded a max 10,440 RPM on the 10% fuel. Today with the FAI I recorded a sustained 9980 RPM. It hit 10,440 but only for a second so I didn't count that.

The next things that were different on this video was the camera angle and tach mounting. I ask any viewers that are familiar with my videos to provide some feedback on the camera angle as to which is preferred. I have links to both videos here. The first from yesterday with 10% and my standard camera angle and the second is the FAI fuel with new camera angles.

Saito FA-50 Open Rocker Revisited (6 min 58 sec)

Saito FA-50 on Omega FAI 0% nitro (8 min 45 sec)
...Continue Reading