Re: High horepower Twin-cams?
Posted: Tue Mar 12, 2019 7:29 pm
No question about being skeptical regarding engine output numbers. Some people buy and make modifications based upon claims that such a mod will add "x" horsepower. Then add these claims up to arrive at an assumed output number to be bragged about. Clearly, need to be looked at with some level of skepticism when not backed up by some evidence.
To defend the numbers for my car:
1. The numbers come from a series of engine dyno runs (posted). These are not even back calculated to the flywheel from a rolling road.
2. The dyno being used, in my case, is regularly used to test a variety of twin cams (and other engines) for historic racing. Dave Vegher's (engine builder) engines are widespread in historic racing, at least here in the US.
3. If Dave's dyno was "juiced" it would have been easily picked up in actual on-track performance. Moreover, his engines are regularly "re-dynoed" (on different equipment) as racers look to tune them for optimum performance. Any major disparity from Dave's dyno numbers would have been flagged. Dave's customers would hardly stand for inflated dyno numbers and he would not enjoy nor deserve the reputation that he has earned.
4. My numbers, while exemplary, are not unique. If you look at twin cam dyno sheets from Tony Ingram, John McCoy, and other premier engine builders, similar types of output are evidenced on their twin cam builds via dyno runs and real world performance.
I have encountered a lot of skepticism about my build. Generally quieted by chronicling the build attributes, showing the dyno runs, and the fact that the builder is Dave Vegher.
In any case, my 2 cents, for what it is worth.
To defend the numbers for my car:
1. The numbers come from a series of engine dyno runs (posted). These are not even back calculated to the flywheel from a rolling road.
2. The dyno being used, in my case, is regularly used to test a variety of twin cams (and other engines) for historic racing. Dave Vegher's (engine builder) engines are widespread in historic racing, at least here in the US.
3. If Dave's dyno was "juiced" it would have been easily picked up in actual on-track performance. Moreover, his engines are regularly "re-dynoed" (on different equipment) as racers look to tune them for optimum performance. Any major disparity from Dave's dyno numbers would have been flagged. Dave's customers would hardly stand for inflated dyno numbers and he would not enjoy nor deserve the reputation that he has earned.
4. My numbers, while exemplary, are not unique. If you look at twin cam dyno sheets from Tony Ingram, John McCoy, and other premier engine builders, similar types of output are evidenced on their twin cam builds via dyno runs and real world performance.
I have encountered a lot of skepticism about my build. Generally quieted by chronicling the build attributes, showing the dyno runs, and the fact that the builder is Dave Vegher.
In any case, my 2 cents, for what it is worth.