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I have 4 S.T.G15 motors that I got from a former R/C Pylon racer. 2 of the motors have a ABC piston and liner. The other 2 are not ABC engines. My question did the 2 ABC engines come stock from the factory that way or did S.T. make a special run of engines for R/C pylon racing. All 4 have the gray color bath tub insert. I took one of the ABC motors apart and the crankshaft and bearings are different from the 2 non ABC motors. If any one has any useful information on these engines besides what came in the box with the motors, I would appreciate any and all comments.
Mike
Mike,
your best chance of getting the answer to this is to ask the ‘ol expert himself………….Doug GalbreathI THINK Super Tigre only sold the G15RV with ABC p/l, and only with pipe timing, but having said that, I certainly wouldn’t swear to it.
I have 2 G15RVs – one with a steel p/l (standard timing) and one ABC (pipe timing). The ABC p/l would be retro-fittable in a front induction case, of course.I remember reading in Aeromodeller about George Aldrich producing tuned up front induction piped G15s but with ABC p/l. That would be late 60’s I think.
Anyway, conjecture……..John
Bud Becker is the one who discovered the ABC p/l in the S.T. G15. Bud used to fly u/c speed and is very knowledgeable about speed engines. He believes the 2 G.15’s in question were from the late sixties. Bud is a friend of Bob DeShields and mine. Its a mystery so far, but worth looking into.
Given that the G15 is the ‘classic’ European 15mm bore x 14mm stroke it is quite possible that it has been fitted with a non OEM P/L unit-though I’d imagine that there were not too many sources for these-as others have stated above-George Aldrich would be a highly likely culprit. He did a lot of development work on tuning G15s for speed which included quite a bit of ABC stuff [we know this sort of parts mingling is feasible with the later schnuerle 15s-I have a Taipan with a Rossi P/L in it, and there are quite a few Cossis [Cox Conquest with Rossi P/L] out there.
Equally-given that ST were the ones who invented the ABC setup (at least for model engines) it is also possible that they are genuine ST units. To the best of my knowledge, ST never offered the G15FI in an ABC version…..BUUTTT….Super Tigre were notorious for the frequency with which they made changes to production engines and never bothered telling people. If the engines came through the normal US distribution system (ie through World Engines) then it might have been a case of fitting spare liners from the US distrubutors G15RV spares inventory…or WE might have placed a special order with the factory.
I am sure there would have been far far more G15FIs produced than G15RVs (given the relative uses of each model) so it is a little odd that ST didn’t produce an ABC version of the G15FI…..certainly in the early 70s-before the Rossi 15 appeared-perhaps they were already tooling up for the less than successful X15 series?ChrisM
‘ffkiwi’
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