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Low C/R = higher torque in general ?

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Old 25-10-2006, 01:51 PM
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leecavturbo
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Default Low C/R = higher torque in general ?

Just got the car back on the road after Lowering C/R feels more torquey.
Obviously the main reason for me lowering is to allow more boost, but i remember years ago having massively reduced C/r seemed to give better low end feel (more torque) ?
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Old 25-10-2006, 01:53 PM
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The correct CR will give the most torque.

any lower an you get less torque (cause PCPs are too low)
any higher and you get less torque (cause PCP's arrive too late)
Old 25-10-2006, 02:00 PM
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JTECH James
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how do you work out the correct c/r?


can of worms time
Old 25-10-2006, 02:10 PM
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AlexF
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engine testing will tell you whats best!
Old 25-10-2006, 02:42 PM
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Originally Posted by JTECHSAFF
how do you work out the correct c/r?


can of worms time
It increases as RPM increases
Old 25-10-2006, 02:46 PM
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AlexF
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you sure about that chip?


It increase as cam duration increses......

Alex
Old 25-10-2006, 02:47 PM
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Originally Posted by AlexF
you sure about that chip?


It increase as cam duration increses......

Alex

It decreases as boost increases
Old 25-10-2006, 02:48 PM
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the only way is to test
Old 25-10-2006, 02:51 PM
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Lots of true statements in this thread.


Complicated business Lee
Old 25-10-2006, 02:53 PM
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AlexF
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Torque is a function of cylinder pressure and the throw of you crankshaft.

So the lower the comp typically the worse the engine performance off boost.

Hence many manfuactures using high CR and LOW boost so that the engine remains torquey at the low end and retains fuel economy.

Alex
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