Speed,Combat,Scale,Racing > Combat
Fox 35-to-36 stroker cranks.
Paul Smith:
During that era I stuck with Super Tigers and never dabbled in the idea up upsizing a Fox from 35 to 36.
Assuming that the bore and stroke of the base engine was .8" and .7", a .716" crank would bring the engine up to .36 cubic inches, a gain of 2.3% swept volume, which would be significant in a close speed contest.
But it would also reduce head clearance by .008". If the engine was under-compressed to begin with, this would help. If the engine was correct to begin with, this would blow plugs and maybe the whole engine. In that era I didn't know of anybody who was actually measuring head clearance. But I did hear of a few who were stampeeding buy stroker cranks.
Is there anybody out there who actually bought a Fox stroker crank and got positive results?
C.T. Schaefer:
The 36x crank was beefed up around the pin. turned out to be pretty durable, even on Blast. The ST crank on nitro, not so much.
Paul Smith:
--- Quote from: C.T. Schaefer on February 06, 2024, 04:35:32 AM ---The 36x crank was beefed up around the pin. turned out to be pretty durable, even on Blast. The ST crank on nitro, not so much.
--- End quote ---
As is I stated, I never either puffed or inhaled the Fox stroker cranks.
But I did spit out a few ST G21 cranks, even on suction on slows.
I recall doing that a few years ago using a G21 on a SL plane. It was a treat for the young guys who hadn't seen it before. It was so common that somebody actually put through a rules change to exempt engine parts from the "dropped parts" DQ rule.
Al Ferraro:
Fox sold a .020 liner shim to offset the longer stroke. I have one LS gave me many years ago.
Andre Ming:
36X piston/sleeve/etc into a Fox 35 Stunt: I'm not understanding why anyone would want to go to the trouble?
I mean, essentially a 36X can be had with the 36 "Sport" or "C/L" engine: 36X piston, sleeve, timing, crank timing, hi-compression, etc, in a very light and short package (compared to the length of a 36X), albeit with a plain sleeved main bearing.
Andre
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