Originally Posted by
Kromulous
Here is the funny part of it, perspective, i am a crew chief on a SLM, we race weekly around Cincy Ohio. Here is what we do in the Pits, the real deal.
The Big Motor is required in qualifying. That is about the only time you can really use it, and Heat races it is required, otherwise your in the way, and or getting ran over. Ask anyone one here that races, they will agree, all out motor and new tires.
Feature time, track slicks off, your looking for every way possible to de-nut the power plant. Ask Bobby Pierce, he will confirm it, a lot of guys disconnect the aft 2 bbls on the Carb. How much power does that cut off? not sure, there are Carb company's that are making smaller carbs now too, 600 cfms etc. We also retard the timing up to 4 degrees at times, most have a switch in the cab that can do it on the fly.
Also they are now making spacers, the one that is under the carb, that restrict the size of the hole. Its a restrictor plate essentially. It has a couple of effects on the Engine, but the overall purpose is cutting power.
So where does this leave us? Not sure but de-hooking the cars when the track requires the big power is the key, otherwise you just dont need it, and it makes driving in the slick hard. The guys that win the Big shows are very skilled at applying the absolute most power, to maintain the highest speed on the track. Its not easy by any means.
This is a perspective from racing at like Florence Speedway, weekly, most often on the slick side. The more traction available the more power you need, the 2 go hand in hand.