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Mar 24, 2012, 09:34 PM
Registered User
earlwb's Avatar
I think the threaded cylinder and head results in a more lightweight engine overall. So it works to the engine's advantage by keeping the weight down. if you have to allow room for screws to bolt things together with, then you have to allow for more metal to let you drill/thread/tap the holes, etc. I doubt there is any cost savings to either method, screw on or bolt on, due to the machining steps involved. At the time this engine was designed it was thought that the rear intake would impart a performance advantage over a front intake engine. But one can get more performance with a front intake and save even more weight in the process too. Which is what one sees with the modern 3.5cc diesel engines (or glow engines for that matter).
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Mar 25, 2012, 09:34 AM
Dieselized User
gkamysz's Avatar
The threaded parts are cheaper to make if clocking of components is not important. It's all a compromise in design and manufacture. Nobody uses screw-in cylinders in modern designs for good reason. Threaded backplates and heads still make a lot of sense, but can require special tooling to install and remove. There's a lot to think about in engine design and manufacture.

Greg
Mar 25, 2012, 03:23 PM
Bill Mohrbacher, MECA Fox Guy
G WILLIE's Avatar

ID help needed


Can anyone tell me the maker, country of origin, year of mfg, and cost of this twin? I first thought it was a Taplin or a Taplin copy, but too many things are wrong.

The front and rear covers are fastened with 3 bolts, not 4.
The mounting lugs and screw bosses don't run the full length of the case.
There are individual brazed on exhaust stacks, not an exhaust manifold.
The heads are finned and held by 4 bolts, not smooth with 6 screws.
There are no lock on the Tommy bars (I love "Tommy bar". I wish I had an excuse to use "gudgeon pin", too!)
The carb is fascinating, but doesn't look like a Taplin.
The socket head capscews look to be of a modern manufacture.
Approximate dimensions are:
2 3/16" cylinder center to center
2 3/8" beam mount length
1 7/16" wide case under mounts
1 3/8" head diameter
3 3/8" bottom of case to top of cylinder
4 7/8" back of rear cover to front of drive washer
It weighs 26 oz

I'm guessing Chinese
Mar 25, 2012, 05:10 PM
Registered User
The crank case looks similar to the CS copy of the OT twin .15.
Looks good, it's always nice to have something a little different.
John
Mar 25, 2012, 05:26 PM
Registered User
Warren B's Avatar
The twin is a 10cc Krines.
I think it's an 80's/90's product from Germany or maybe Eastern European.

Pretty sure it's not Chinese.
Mar 25, 2012, 07:03 PM
Bill Mohrbacher, MECA Fox Guy
G WILLIE's Avatar
Many Thank's
Mar 26, 2012, 02:22 AM
Sticks, Tissue & old Diesels
brokenenglish's Avatar
Quote:
Originally Posted by G WILLIE
There are no lock on the Tommy bars (I love "Tommy bar". I wish I had an excuse to use "gudgeon pin", too!)
Bill, there never is a lock on a Tommy bar. The Tommy bar is the "transversal" lever that you use to turn the screw... The lock is on the threaded compression screw...
I'm waiting for your ECJ series to get to the Combat Specials and Rat-Race .40s, and the disassembling thereof... Then you'll be able to use gudgeon pin!
Brian
Mar 26, 2012, 06:59 AM
Good Better Best quest.
olmod's Avatar
Quote:
Originally Posted by Warren B
The twin is a 10cc Krines.
I think it's an 80's/90's product from Germany or maybe Eastern European.

Pretty sure it's not Chinese.
Hi Warren is that a sliding piston throttle on that carb ?
Mar 26, 2012, 07:01 AM
Bill Mohrbacher, MECA Fox Guy
G WILLIE's Avatar
Quote:
Originally Posted by brokenenglish
Bill, there never is a lock on a Tommy bar. The Tommy bar is the "transversal" lever that you use to turn the screw... The lock is on the threaded compression screw...
I'm waiting for your ECJ series to get to the Combat Specials and Rat-Race .40s, and the disassembling thereof... Then you'll be able to use gudgeon pin!
Brian
I stand corrected Brian. That's the danger of we Americans using a foreign language (English).

You don't have to wait for the Combat series. In part III of the Stunt 35 series, I will get to use gudgeon pin.
Mar 26, 2012, 07:06 AM
Bill Mohrbacher, MECA Fox Guy
G WILLIE's Avatar
Quote:
Originally Posted by olmod
Hi Warren is that a sliding piston throttle on that carb ?
Yes it is a sliding trottle barrel.

On MECA's region 16 website, www.meca-region16.de there is a picture of a Krines made from Herr Krines drawings. It was started in 1963, but no idea when it was finished. The notes say it is a 20cc engine.

I'm still rying to find out when and where the newer version was made.
Mar 28, 2012, 07:53 PM
Registered User

AMZ diesel


Is any one familiar with this diesel? It's a long stroke, so probably not a high rpm engine.The thrust washer looks almost like the early ETA .15, even the same colour.
John
Mar 28, 2012, 08:06 PM
Registered User
Warren B's Avatar
Looks like an Oliver Tiger MkIII based design to me, obvioulsy with some modern features like the muffler mounting jacket etc.
Mar 28, 2012, 08:20 PM
Closed Account
Quote:
Originally Posted by JohnAV8R
Is any one familiar with this diesel? It's a long stroke, so probably not a high rpm engine.The thrust washer looks almost like the early ETA .15, even the same colour.
John
The AMZ engines were made by a Dr. Walter Sturm, Im Strasser Feld, Herzogenrath (or Roetgen ?) Germany. He placed small adverts for this interesting 2.5 Diesel in 1980's era AeroModeller magazines. BOB
Mar 30, 2012, 06:29 PM
Registered User
Thanks Bob. Do you have any more information on EU Engines. The box cover shows an English address. Since this is the first time I have seen a picture of the AMZ, I'm guessing that either it wasn't very popular, or not too many were made.
John


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