Quote:
Originally Posted by wparsons
This is what confuses me about these blocks. Any other engine a longer runner gives better low end power, and shorter runners give better top end power.
These show gains up top by increasing runner length. FA20 > physics?
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The vol. efficiency is increasing in the 5000-6400 zone which causes more torque there but the vol. efficiency drops off sooner than stock. Luckily the boost in vol. efficiency is so good that it prevents the torque from ever going below the stock curve.
Look at where the torque starts dropping off for both runner lengths. Crawford's may make more peak torque but it starts to drop off sooner than a stock torque curve.
As for low end power, it is indeed a little odd that there is no change there.
Can't wait to see nelsmar's tests!