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vartiak15
03-14-2005, 05:45 PM
ive got a weisco 12.1 compression piston and it isnt hard to kick. i dont think its got all the compression it should have. how much compression should it have and how do i got about checking it? (im sure my dad has the tool, hes at work now)
short4stuff
03-14-2005, 09:46 PM
did you bore and hone the cylinder for the size piston you bought? .. I have a feeling you didnt.
I am pretty sure your not getting the full compressuion of that piston because you say you are running 87 octane with no dentenation .. and I have a 10.25:1 and running 91-93 octane and Think I can still hear dentenation.
vartiak15
03-14-2005, 09:57 PM
ya i honned it and it was a stock size piston just high comp.
short4stuff
03-14-2005, 10:06 PM
ya i honned it and it was a stock size piston just high comp.

did you measure the bore with a mike ?.. you realized that the clearence between the piston and cylinder was suppose to be .002 or .003 of an inch .. which is precision .. atleast I feel it is ...
my cylinder was like .004" out of round and burned oil like a mofo.
samster143
03-14-2005, 10:48 PM
I have like 170 psi with a wiseco 10.25:1. At least that is what is was a while ago. I have a compression guage that is on a hose and threads into the spark plug hole. The guages that you have to press into the hole kinda suck. You need some one else to hold it while you kick it.