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Old 07-24-2008, 11:59 PM   #34 (permalink)
amateur mech. engineer
Join Date: May 2008
Location: New York City
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Originally Posted by jamesw View Post
Just wondering if increasing the intake runners will
have increase in fuel efficiency?

Not directly but indirectly by increasing low end
torque. Say by installing spaces between the throttle body
and the engine block?

Any thoughts?
I don't think this would help unless it allows you to use a higher gear much more than you do now.

Some things that are likely to improve engine efficiency:
1) increase the compression ratio
2) use a heat barrier coating on pistons and combustion chambers
3) retard the camshaft a few degrees (but lose some torque)
4) optimize the ignition timing
5) raise the thermostat temperature
6) install zero gap piston rings (like Total Seal)
7) install a water injection system to add water at high loads
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