Speed,Combat,Scale,Racing > Combat

Fox 35-to-36 stroker cranks.

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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.

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