Hign Compression Vs. Low Comperssion
08-22-2006, 05:01 PM
#21
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Any one of the two most common engine builders will get you on your way. Engine rebuild is in the $3k+ range.
Laskey Racing (other have gone here with success)
OR
ERL Performance (this is where I went)
From what I went through 9:1 is the most common ratio.
-Chris
Laskey Racing (other have gone here with success)
OR
ERL Performance (this is where I went)
From what I went through 9:1 is the most common ratio.
-Chris
08-22-2006, 06:26 PM
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Originally Posted by honda9krpm,Aug 22 2006, 04:55 PM
Choosing compression ratio is very important and it depends on what you want to to do with your car. The aim is to get as high effective compression ratio as you can with minimal risk of detonation. Effective compression ratio is static compression ratio + boost. There is a formula for it on the web if you are keen.
If you want to use the car for daily use with low, to medium boost then a higher static compression ratio is ideal. This will give you more midrange power and more importantly good fuel economy.
If you want a high power, high boost, drivetrain killing engine then a low static CR ideal.
Do a search on s2ki for the piston options. From memory there are 8-10.5:1 ratio pistons available. There are higher ratio too but not ideal for FI purpose. IMHO the forged pistons are all very similar. There are only less than a handfull of places where the forged metal for the pistons came from. What you pay is for the brand, design and quality control.
Hope that help. It's a new learning curve with engine rebuild, but it's fun one
If you want to use the car for daily use with low, to medium boost then a higher static compression ratio is ideal. This will give you more midrange power and more importantly good fuel economy.
If you want a high power, high boost, drivetrain killing engine then a low static CR ideal.
Do a search on s2ki for the piston options. From memory there are 8-10.5:1 ratio pistons available. There are higher ratio too but not ideal for FI purpose. IMHO the forged pistons are all very similar. There are only less than a handfull of places where the forged metal for the pistons came from. What you pay is for the brand, design and quality control.
Hope that help. It's a new learning curve with engine rebuild, but it's fun one
http://www.rbracing-rsr.com/compression.htm
So what is the max safe static compression ratio with 91 octane?
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