is it the Proform screw in head ?????
need to grt a longer bolt then 
Need help with a Piston Stop question
Thread Starter
Team Owner
Joined: Mar 2002
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From: Huntsville AL
Need help with a Piston Stop question
I picked up a piston stop from summit and it is the short thread type and my plugs are the long thresd type. Anyway, I installed it and screwed the bolt all the way in and and the piston does not hit the stop???? Whats going on here???? I would think it would hit. I turned the engine over by hand several times.
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
You got further than I. I couldn'y get the thing to screw into the head. I think the threads were different. I used a plastic straw to feel for the top of the piston.
Le Mans Master
Joined: Oct 2002
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From: Las Vegas - Just stop perpetuating myths please.
Easy does it.
Originally Posted by Mr D.
I picked up a piston stop from summit and it is the short thread type and my plugs are the long thresd type. Anyway, I installed it and screwed the bolt all the way in and and the piston does not hit the stop???? Whats going on here???? I would think it would hit. I turned the engine over by hand several times.
But i can c that on a BB the chamber could be large enough such that stop-bolt may not reach the piston. My 69cc chamber sb with stock dished pistons seemed to use most of that stop-bolt length.
I have heard of a tricky homemade gage rather than a piston stop. Take an old (or new) sparkplug and gut it of porcelin and electrode. Find rod or tubing to fit & slid into chamber. Mark rod with a tape stop and watch for movement. Record clockwise degrees then cc degrees and divid the difference by 2.
Hope this helps.
cardo0
Racer
Joined: Dec 2002
Posts: 421
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From: Long Grove, IL
Originally Posted by cardo0
...I have heard of a tricky homemade gage rather than a piston stop. Take an old (or new) sparkplug and gut it of porcelin and electrode. ... cardo0
Last edited by griffths; Oct 30, 2004 at 03:08 PM.