Quote:
Originally posted by kruhland@Feb 8 2006, 01:25 PM
it's a upcoming law change for the manufacturers to post how they get their HP.*
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It's not really a law as such as it is a change in the standard. The SAE made changes in the way HP is calculated to make sure all manufacturers are on the same page.
It's sort of like the HP ratings in the 70's. They were all Gross HP which basically meant all the engine had hooked up was an alternator with no exhaust, smog equipment etc.
Basically what auto manufacturers did was fill the test engines with Premium fuel. Now most off shore manufacturers have a form of variable valve timing. With this feature the cars computer can advance the timing to produce better HP.
More octane in the fuel is less prone to knock so therefore there is little to no chance of detonation. This way if we all run our engines with 91 we will all be getting much needed HP.
Now what the SAE has stated is you need to test the engine in the following fashion or put an "*" beside the number. I have found the following link that should provide usefull in seeing the changes.
http://www.sae.org/certifiedpower/