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Originally Posted by pontiac jack
I need to point out that I am also in awe of the work on Jim's heads, and have no doubts that it's a killer engine. The only reason I posted here, is to learn why a dyno program (or operater, whatever) would add a "friction" value to the torque measured by the dyno's absorption unit.
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Im not sure anyone knows other than the people who make dynos. LOL Maybe a email to Superflow would answer that? FWIW, when Keorner Racing was tuning my HiPort 482, Jeff told me he thought the friction factor was silly because "what motor operates with no friction?" Furthermore the friction tables are pretty generic using bore and stroke to calculate. While making pulls he used the software without a friction correction as his tuning preference, not sure why, then added the correction in when we were finished just so the numbers would be "like every other dyno"
Speaking of pulls, a tractor pulling a sled has to be the ultimate dyno! Go or No Go LOL