will somebody guess what`s my compression: .020 flattop CP piston and fr500 heads
my compression
- Thread starter silver2001cobra
- Start date
high?
how high?,i`ve been told 10.3 to 1 to 10.8 to 1
11.5:1
that sucks,i didnt know it was that high
why did you go with a flat top piston?
well i had my motor built awhile ago and i wanted all the hp i can get at the time.I knew it would be awhile before i did anything else major .Oh well ,no force induction for me then.
Why not ask the builder to be sure?
What is the chamber of the fr500 heads? I have stock heads with flattops and it's about 10.4:1. I don't think you can get above 11 without going with a slight dome.
I just ordered my engine and I have fr 500 heads too. But i had to special
order my pistons to get 11.5 :1. I'd say maybe 10.5:1.
i did ,he said it was 10.5:1,but wanted to get ur guys opinion.
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He is right, it sure as hell aint 11.5 w/ just a flat top and regular Fr500 heads.
NXSVTCOBRA
New Member
10.5:1 or so is what you are running. exactly what 10.??? doesn't really matter, you're just in the ballpark of 10.5:1
what is the cc size of the fr500 heads?
what is the cc size of the fr500 heads?
Did you just decide to come by and figure that you'll just throw up some numbers
11.5...give me a ****ing break.
Your compression can be anywhere from 9.9-10.8. There are a lot of factors that determine compression like piston to deck clearance, valve relief volume, gasket thickness, Combustion chamber CCs, etc.
Do your pistons have valve reliefs? If they do, you are probably closer to 10 to 1 than 10.5 to 1.
Did you get a build sheet?
These are the factors that determine compresison ratio:
Do your pistons have valve reliefs? If they do, you are probably closer to 10 to 1 than 10.5 to 1.
Did you get a build sheet?
These are the factors that determine compresison ratio:
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Guess you will only be using nos on this motor.
no i didn`t get a built sheeti had the motor built 4 years ago.Also ,there is no valve reliefs on the pistonsYour compression can be anywhere from 9.9-10.8. There are a lot of factors that determine compression like piston to deck clearance, valve relief volume, gasket thickness, Combustion chamber CCs, etc.
Do your pistons have valve reliefs? If they do, you are probably closer to 10 to 1 than 10.5 to 1.
Did you get a build sheet?
These are the factors that determine compresison ratio:
no nos for me,if its 10.5:1 ,i still might go boost,just small amount.I just some power now,having 360 rwhp 2 years ago was cool,but people are starting to pass me by.fr500 intake was an option,but to find out i might loose some mid-range power.
What cams are ya using? I ask because with only 220 deg dur my PTV clearance was pretty tight without valve reliefs.
fr500 cams
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