Quote:
Originally Posted by RobFrost
I wonder will the DC80 be okay with 10.5:1 or better with lower like 10:1? In terms of compromises, a peppy engine is more important to me than being streetable - although I would aim to use it almost daily. As I already have a standard 2.2 T engine for being sensible.
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The key to running huge cams in compromised situations is a dance between compression, ignition timing, and cam timing. To make horse power with a small motor you have to spin it. It's an air pump and you have to pump air. That simple.
As counter intuitive as it sounds, in running huge cams in these "street" applications I have found the formula to be, lower compression [9.5:1], advanced cam timing [piston clearance is critical] and aggressive ignition timing [30-34 twin plug]. Now all you have to do is find some CO tuning numbers and you're good to go.
Years ago I built a 2.8SS, Slide valve, twin plug street engine with RSR Sprint cams [arguably an ugly street cam] that was in a car called the "Red Sled". Randy Wells wrote an Excellence article about the car and was amazed at how civilized it was until you pushed the throttle in anger. These principles were incorporated in that build.
The Excellence article was from Oct 2011 "Sliders An early 911 with SoCal hot-rod style."
You may have remembered this engine from the cover of Wayne's engine rebuild book.
