Quote:
Originally Posted by Critter
I will agree that the advertised dyno numbers for aftermarket packages aren't usually realistic to the average hot rodder. First off they are talking about crank hp numbers. they set up an engine with everything perfectly machined and balanced. After they put on the parts being sold they sit at the engine dyno for hours on end tweaking and tuning and trying different options until they squeeze out every last drop of power. Usually by that time the motor is timed in a way that it is no longer a real world drivable engine. Not to mention that average guy in his garage or even working with a machine shop will never tweak the engine anywhere close to that to get everything setup even close to the perfect conditions that were used for dyno graphs. Unfortunately 9 times out of 10 when I dyno a vehicle that has never been on the chassis dyno the owner is disappointed in his numbers. Either because he had advertised crank HP numbers in his head or the vehicle just flat out isn't tuned right.
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I agree with idea that the average guy can't just all bolt this together and end up with the advertised numbers, but if the package is properly tuned, they will yield times on the track very close to the numbers to advertised numbers should get. A friend of our's put the Edlebrock Performer RPM kit on a GM 350 crate engine his street/strip '72 Nova. After a few times at the track and tweaking it in, we got 12.30's @ 107 out the car, and it weighed 3240# with him in it. That's knocking on the door of the advertised numbers Edelbrock claims.
I will say that car was running 12.50's and 12.60's when he first put it together without track tuning, so that reinforces what you are saying about the average guy just putting this in his car/track calling it a 420 HP engine.