cbn70 Posted September 18, 2006 Report Posted September 18, 2006 What are people running for a squish clearance(piston to head). My motor is about .020 of on inch. This seems to be a little tight?? Might have to put in another base gsket to increase it??What does everyone else have?? thanks Chuck Quote
bansheeseat$$ Posted September 18, 2006 Report Posted September 18, 2006 Thats defenatly too tight.I set all the ones I build to minimum of .046. Quote
cbn70 Posted September 18, 2006 Author Report Posted September 18, 2006 What is the best way to increase the squish? Just double up on the base gaskets or does someone make them in whatever thickness you want?? Chuck Quote
[email protected] Posted September 18, 2006 Report Posted September 18, 2006 last i recall vitoz atv sells base gaskets and head gaskets to certain sizes. not sure which to run but they do carry all sortsa sizes Quote
GEEZR Posted September 19, 2006 Report Posted September 19, 2006 The compression domes in my pro design cool head are at 1 mm (.040) squish. Seems to run fine. Even that seems a bit tight. Next time I take out the domes I'll set them up in the lathe and trim some fat off. Quote
DaFish Posted September 19, 2006 Report Posted September 19, 2006 can someone please explain this "squish clearance" and how to measure it and how important is it? Quote
BigRed350x Posted September 19, 2006 Report Posted September 19, 2006 It is a measure of the clearance between the top of your piston and the squish-band of your domes in your head, or any surface of the domes for that matter. Quote
DaFish Posted September 19, 2006 Report Posted September 19, 2006 how do you measure it? with feeler gauges? and what should it be with a noss head with 21 cc domes and stock cylinders. Quote
cbn70 Posted September 19, 2006 Author Report Posted September 19, 2006 used some solder and put it in the cylinder and then turned the engine over.this then flattens out the solder, then take it out and measure it. Quote
BigRed350x Posted September 19, 2006 Report Posted September 19, 2006 used some solder and put it in the cylinder and then turned the engine over.this then flattens out the solder, then take it out and measure it. Yep, that's the most common way to measure it. Quote
DaFish Posted September 19, 2006 Report Posted September 19, 2006 (edited) what position does the piston have to be in when you start it? can you go into a little more detail please this sound like something very important. thank you. can i estimate my squish band and squish velocity by lookin at my dyno results? Edited September 19, 2006 by DaFish Quote
GEEZR Posted September 19, 2006 Report Posted September 19, 2006 I would'nt recommend starting up your shee with that piaece of solder in your cylinder. What I've done is disconnect spark plug wires , remove carbs, and intake manifolds, then placed a 1 in. length of (1/8 dia.) pc. of solder on top of piston , moved kick starter by hand just to get piston to " squeeze" it , then remove and measure the thinnest section w/ your mikes. Hope this helps. good luck. Quote
dajogejr Posted September 19, 2006 Report Posted September 19, 2006 I think my cub is setup at .050, if that helps. My cub was uneven at the deck and top out of the box...so, it had to be blocked up. Mine runs two base gaskets.... Quote
cbn70 Posted September 19, 2006 Author Report Posted September 19, 2006 thanks GEEZR thats the same way that I checked mine. Solder through the spark plug holes, then turn it over by hand using the stator and squish the solder and pull it out the measure it. chuck Quote
Animalman294 Posted September 19, 2006 Report Posted September 19, 2006 I've also heard of people using clay to do the same thing, but I think the solder is a better way to go because you can't change the thickness tryin' to get it out................. :beer: Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.