Rev Limits

[Todd Hedges]

I have a mellow 428 with Edelbrock Alumn. Heads.
Nothing special done to them, right from the factory.

The cam is a Crowler flat face solid cam shaft
110LC 290/298 Adv, 247/252 @ .050, 313/321 lift

Compression is 10.6:1

Carb is a standard Holley 4150HP

The dyno sheets show 452 hp @ 5600 rpms
and 458 ft-lbs @ 4600 rpms. (crankshaft data)

The motor pulled over 425 hp at 6200rpms
where the dyno sheet stopped taking data.

I have a 6000-rpm limiter setting right now, but have
ordered the modules for the odd 100 increments to 6900.

Any suggestions and experience with setting
on a similar set-up would be appreciated.

Thanks
Todd

[Andy Dunn]

In one of Carroll Smith's books...either "Prepare To Win" or "Engineer To Win", he stated that he sets his race engines at 300rpm greater than peak HP. If you use this rule of thumb, yours would be 5900 (6000 sounds fine). Any higher than that and you are losing efficency and perhaps being harder on components that needed.

There is also a neat site online which you can find the mathematically BEST shift points from an acceleration standpoint. Use you dyno sheet and transmission gearing in the following online calculator.

Calculating Optimum Shift Points

hope this info is useful


Andy

[Todd Hedges]

Thanks Andy.
That was a great help.