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Old Mar 13, 2013, 02:26 PM
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Evolution Engines 15cc Gas?


I have a funny feeling we will be seeing a Evo 91GX before too long.

Evolution has just introduced the 91NX glow engine. Interestingly, it has the same exact pad on the crankcase for mounting the ignition pickup, as the 10GX engine.
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Old Mar 13, 2013, 02:43 PM
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I think they should bore it out a little more and make it a 1.00 gas engine (17cc).
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Old Mar 13, 2013, 02:50 PM
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Originally Posted by earlwb View Post
I think they should bore it out a little more and make it a 1.00 gas engine (17cc).
I'll bet with a different (thinner) sleeve they could (larger piston).

Ken
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Old Mar 13, 2013, 03:30 PM
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Does anyone know if this will be a ringed version ? Cheers the new pope
Old Mar 13, 2013, 03:45 PM
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That might be a first to use an ABC cylinder/piston in a engine larger than 10cc. I think 10cc is probably the limit for ABC cylinders and pistons. But SC apparently did make a 1.08 cubic inch displacement engine for a short while with ABC cylinder/piston construction. But there are too many problems and issues with metal distortion from uneven heat distribution when the engine is running. I don't remember seeing or hearing about any engines larger than 10cc with lapped cylinder/pistons or ABC cylinder/pistons. But there might have been some though. There were a few lapped piston engines at 10cc displacement using a iron piston and steel sleeve but they tended to vibrate way too much though.

Oops I almost forgot that there were some ducted fan engines made with ABC cylinders and pistons in them. These engines did go .80 or just over 1.00 cubic inch displacement. So yeah they could make one ABC as a 15cc engine then.
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Last edited by earlwb; Mar 13, 2013 at 03:50 PM. Reason: add more information
Old Mar 13, 2013, 05:14 PM
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Originally Posted by earlwb View Post
That might be a first to use an ABC cylinder/piston in a engine larger than 10cc. I think 10cc is probably the limit for ABC cylinders and pistons. But SC apparently did make a 1.08 cubic inch displacement engine for a short while with ABC cylinder/piston construction.
Earl,


MVVS also still offer their 12.7 and 15 cc (.77 and .91) engines, with a very successful and long-lasting ABC setup.
They were never of any other construction.

Their even larger 26 cc engine was ringed, however.
Old Mar 14, 2013, 12:53 AM
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Originally Posted by Kmot View Post
Evolution has just introduced the 91NX glow engine.
wondering why glow again ? isn't glow engines market dead yet ?
Old Mar 14, 2013, 09:26 AM
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Glow engines are still hugely popular. There is nothing wrong with glow engines. Their simplicity of use with not needing complicated carburetors, spark plugs, ignition systems, etc. still make them very popular. The .40 through .50 size glow engine market is still really good as that size plane fits easily in most automobiles for tranasport to and from the flyingt fields. But larger planes are still pretty popular still.

But electrics are steadily moving in on the larger and larger size engines over time. At first it was 1/2a size planes being electrified but as the motors, ESC's and batteries evolved, the electrics are being used in ever larger size planes. The major problem is still flight time as the battery packs are still limited in that respect, thus the glow engines still win out in that area. The battery pack cost can still be a huge hurdle too.

Gasoline engines still have issues with gasoline odors and smell, plus more complicated carburetors though.
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Old Mar 14, 2013, 01:19 PM
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Yeah, glow engines are awesome. It's just that the new breed of 'small' gas engines are rather interesting and just another option to choose from. I will always fly glow, and now occasionally gasoline fueled engines.
Old Mar 14, 2013, 03:34 PM
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Originally Posted by Kmot View Post
I have a funny feeling we will be seeing a Evo 91GX before too long.

Evolution has just introduced the 91NX glow engine. Interestingly, it has the same exact pad on the crankcase for mounting the ignition pickup, as the 10GX engine.
We can't pull anything over on you guys. Join us at the Toledo Show in April for a few other surprises.

Pete
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Old Mar 14, 2013, 03:59 PM
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We can't pull anything over on you guys. Join us at the Toledo Show in April for a few other surprises.

Pete
Sweet....
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Old Mar 14, 2013, 07:48 PM
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A 15 GX could find a home in my hanger.
Old Mar 14, 2013, 09:06 PM
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The plot thickens. Nice.
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Old Mar 14, 2013, 11:55 PM
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Dang, just as I was about to pull the trigger on a DLE 20 for my new z-Lin.
I wonder what the price point will be?
Old Mar 15, 2013, 02:28 AM
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The biggest problem with gasoline is the odor and how flammable it is.
My wife hates the odor of my gasoline engines while she doesn't mind the nitro.


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