RevTheory wrote: ↑Mon Jun 15, 2020 12:36 pmSchmidtMotorWorks wrote: ↑Mon Jun 15, 2020 11:37 am If you narrow down the range of engines that 128 is supposed to be applicable to.
What is the highest and lowest value that it returns?
Is it right for all exhaust systems?
Is it right for both automatic and manual?
Is it right for all driving environments?
Is it right for all driving abilities?
Of course not, because those parameters are not inputs to the formula.
Even when customers can see the measured dyno charts of engines, they never choose the one they like best when double-blind test-driving them.
Yeah, that makes complete sense because those are the exact parameters that were laid out in the initial post.
Nope: see the OP below.
The point is, that the 128 formula is incapable of considering those parameters.
How would you adjust -modify the LSA of the 128 formula when applying to a supercharged engine.
Eg: Roots supercharged (non intercooled)
Lowered compression for pump gas operation.
X? amount of added LSA per lb of boost?
Y? amount of subtracted LSA per full 1 compression ratio reduction?
Or???
Example engine: Typical 350 cid Sbc 23 deg head
2.02" intake valve.. 7.5:1 cr
5 psi boost....... 10 psi boost 15 psi boost.
What would the 128 formula LSA recommendation be for these boosted example engines be?