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Old Mar 24, 2012, 09:34 PM
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USA, TX, Grapevine
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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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Old Mar 25, 2012, 09:34 AM
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Chicagoland
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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
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Old Mar 25, 2012, 03:23 PM
Bill Mohrbacher, MECA Fox Guy
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Beaver Falls, PA
Joined Dec 2006
656 Posts
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
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Old Mar 25, 2012, 05:10 PM
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Canada, ON, Hamilton
Joined Oct 2005
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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
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Old Mar 25, 2012, 05:26 PM
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Mt Evelyn, Melbourne, OZ
Joined Dec 2008
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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.
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Old Mar 25, 2012, 07:03 PM
Bill Mohrbacher, MECA Fox Guy
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Beaver Falls, PA
Joined Dec 2006
656 Posts
Many Thank's
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Old Mar 26, 2012, 02:22 AM
Sticks, Tissue & old Diesels
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France, Centre, Amboise
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Quote:
Originally Posted by G WILLIE View Post
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
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Old Mar 26, 2012, 03:06 AM
F1B is ok.
Monheim am Rhein Germany
Joined Jul 2008
482 Posts
@ Taplin-Twin

http://modelenginenews.org/drj/taplin_mk3.html

http://www.google.de/search?q=taplin...w=1254&bih=605

Heinz
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Old Mar 26, 2012, 06:59 AM
Good Better Best quest.
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Australia, VIC, Cranbourne East
Joined Apr 2004
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Quote:
Originally Posted by Warren B View Post
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 ?
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Old Mar 26, 2012, 07:01 AM
Bill Mohrbacher, MECA Fox Guy
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Beaver Falls, PA
Joined Dec 2006
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Quote:
Originally Posted by brokenenglish View Post
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.
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Old Mar 26, 2012, 07:06 AM
Bill Mohrbacher, MECA Fox Guy
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Beaver Falls, PA
Joined Dec 2006
656 Posts
Quote:
Originally Posted by olmod View Post
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.
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Old Mar 28, 2012, 07:53 PM
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Canada, ON, Hamilton
Joined Oct 2005
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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
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Old Mar 28, 2012, 08:06 PM
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Mt Evelyn, Melbourne, OZ
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Looks like an Oliver Tiger MkIII based design to me, obvioulsy with some modern features like the muffler mounting jacket etc.
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Old Mar 28, 2012, 08:20 PM
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Joined Nov 2009
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Quote:
Originally Posted by JohnAV8R View Post
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
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Old Mar 30, 2012, 06:29 PM
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Canada, ON, Hamilton
Joined Oct 2005
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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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