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Archive for March, 2016
Posted by dmrcflyr2 | Mar 26, 2016 @ 05:28 PM | 4,935 Views
All this Saito 45 cam gear swap out stuff has me wanting to look at all 4 of the Saito 45's I have right now. I have 4 and that is the most I have ever had at one time.

From Left to right in all photos (If you do not click on view all images in thread you are missing half the pictures)
FA-45S(pecial), FA45, FA45 MK??, FA45 MKII

The FA-45S came out in the early 90's from what I gather from the box color, but it could have been 1989. It is an ABC with ring construction. it features a 'hotter'cam gear to make more power than the standard MKII. It has the most up to date carburetor and intake manifold. Basically it represents the most modern Saito out of the four.

The FA-45 is the iteration of the 45 Saito put out. It came out in 1982 and features a two piece head design, and AAC ringless construction. If you look closely at the photos you will see the head design, intake manifold and carb differences from the 45S.

The FA-45MK??. This engine I picked up recently and is a bit of a conundrum for me. It has the old style carb, but it was cut off, and it has a strange crankcase that simply has Saito and 45 lightly stamped on the case. It does not have the raised up section with the stamping on it. ***UPDATE***I was looking closely at this and the FA-45 and this share the same crankcase design. That must make this a VERY early 45, possibly from 1983-84.
(I figure this is a mid 80's version before they finalized the crankcase design. Or maybe they...Continue Reading
Posted by dmrcflyr2 | Mar 26, 2016 @ 11:25 AM | 5,718 Views
Well I have completed the first two steps in this experiment. The first pictures are of the completed engine in the stock form after reassembly. It sure is a nice looking engine!

I ran the engine in its stock form and peaked it out. You can see the RPM figures on the video, but I reached a peak of 9990 RPM. My battery in the camera died before that reading was shown.

I then swapped out for the 50 cam gear housing and other parts, and reset the valve lash. Without touching the needle valve from the last run the engine was already at peak. It hit 10440 RPM. That is a gain of 450 RPM. The idle and transition did not seem to be affected at all.

The parts required to make this swap out are as follows:

1. Cam gear housing for a Saito 50/56/45S
2. Cam gear for 50.
3. Cam followers for 50/56
4. Push rods for 50/56

To make the change permanent you will also need push rod tubes. I did not use push rod tubes in my video to keep things a bit simpler.

The final part of this experiment will be when the cam gear from the Saito 56 arrives. I will repeat the same steps and record the readings.
***UPDATE*** I checked a Saito Manual and found that the 50 and 56 share the same cam gear. Thus a definite conclusion to the experiment.

I have since added a video shot today of my 45S as a baseline run for what I am trying to achieve with this experiment. The funny thing is, I have already matched the performance of the 45S with the 50 Cam gear. The peak RPM readings are the same. The 56 cam gear might not yield any further increase.

Saito FA-45 MKII Cam gear swap (10 min 20 sec)


Saito FA-45S Baseline run (5 min 58 sec)

Posted by dmrcflyr2 | Mar 25, 2016 @ 05:35 PM | 5,064 Views
I was not really too sure what to title this post, so it ended up being long. Here is the story:

I purchased a Saito FA-45 MKII from eBay. This is a very nice engine that came complete with box, most of the tools, and all of the paperwork normally shipped with these engines. One piece of paper that came with it was EXTREMELY interesting to me anyway, the original bill of sale! This engine was purchased from Circus Hobbies in Las Vegas NV in May of 1988! Very cool.

Anyway, this engine really didn't need me to do anything to it. It was pretty clean and felt like it would run as it was. It was a bit stiff, the feeling of an engine that has not been run in years. So being me, I decided to completely disassemble it and inspect the bearings. This was one of the easiest tear downs ever. Really nothing was stuck or gave me any issues at all. The bearings were a bit gummed up and after cleaning I decided to just install them again. I can always replace them later if need be.

And then it hit me. Why not try something I have wanted to do for a very long time? I have been wanting to convert a 45 MKII to a 45S for quite a while. To my knowledge a FA-45S is just a 45 with a cam gear of a 50 or 56. The 56 was not available when the 45S came out and real factual information on Saito engine history is a bit difficult to obtain. The best I could piece together from other forums and folks that have done this was that the 45S had a 'hotter' cam.

I set out to find a...Continue Reading
Posted by dmrcflyr2 | Mar 14, 2016 @ 07:37 PM | 4,710 Views
I was restoring and getting this OS 46 SF running for a friend and sort of fell in love with the engine. We worked out an arrangment and it became mine. This was a subject of an earlier post.

This particular engine had some damage but looked to be a very low run time engine. One of the mounting lugs was broken pretty badly but the engine still ran well. There was no intrusion into the crankcase itself.

The muffler also had some strange damage, manufacturing defect or something resulting in a strange hole at the end of the muffler.

I have used JB Weld on many occasions on a variety of applications from motorcycles, to model engines. I figured it was the best to attempt to fix these issues as well.

On the engine mounting lug I created a form using Popsicle sticks glued and clamped together. Unfortunately I did not take a picture of the mold. I filled the area with what seemed to be a sufficient amount of JB Weld and allowed it to cure for about 5 hours before removing the mold sticks. This allowed it to cure just enough to remove the sticks and begin the sanding process. Once sanded I will allow this to cure for another 24 hours or so before doing anything else to it. SInce I plan on using a universal strap mount type of engine mount I really do not need to re-drill the hole, but I might do it anyway when fully cured.

The muffler I inserted paper towels into the chamber to act as a bridge for the JB Weld to cover the big hole. This I allowed to cure...Continue Reading
Posted by dmrcflyr2 | Mar 12, 2016 @ 02:13 PM | 4,831 Views
Let me start this post with a disclaimer. I am not a Webra engine expert nor do I claim to be.

Today's post features the Webra Speed 61 engine I received from a fellow modeler and friend Balsaworkbench. This is one of three engine sent directly to me from his purchase on eBay.

In a previous post I detailed the condition and showed videos of the dis-assembly. In this post I show the first times I ran this powerful engine.

This engine features a Dynamix carburetor. I have never set or run an engine with this type of carb before. I think I did pretty well. The first run went well, the second went ok but not as good as the first. I totally screwed the carb settings up on the third run, but got it dialed in again. The third run had an APC 13x6 prop installed.

Webra Speed 61 first run (8 min 7 sec)


Webra Speed 61 second and third runs (11 min 29 sec)
...Continue Reading
Posted by dmrcflyr2 | Mar 08, 2016 @ 05:37 PM | 5,001 Views
Rob here are pictures of your engines. I can post the pictures here without reducing the resolution like I have to do in email.

First the Webra Speed 61. This has got to be one of the ugliest engines I have ever seen, design wise anyway. I have only ever owned and run one other Webra before and it was a 40 Silverline. I have never seen a carb like this one before. It is a Dynamix carb; one Webra aficionados really love from what I have read. It does not move at all yet. The engine turns over and has decent compression. The bearings feel fine too. It appears to have a Dykes ring. I'll provide more pictures and information once I begin to clean it up.

The OS 46 SF looks pretty decent with the exception of the broken mounting lug. It too turns over fine and has good compression. The carb rotates freely and I do not expect any issues during clean up.

Anyway feel free to comment on things you would like to see done on these engines or anything else for that matter....Continue Reading