$ Building a Slant 6 for performance
I doubt my last Slant made any where near 300 HP, in fact I would guarantee it. The light weight helped, and so did the 4.86 gears. It surprised many people on the street.
There's an online calculator at:
http://www.wallaceracing.com/et-hp-mph.php
It is not 100-percent accurate, by any means, but is fun to use and I think, comes fairly close to figuring out flywheel horsepower if you give it the weight, e.t. and mph. I believe it's useful as a tool for figuring out how much adding weight, or subtracting it from a given combination will help or hurt performance.
For example, it says that a 3,300-pound car needs 300 horsepower to run a 12.95 @ 103 mph. I find it interesting that those numbers are almost the exact ones that were turned by Tom Wolfe's Dart turned with the addition of just a 2bbl carb and a junkyard turbo.
The program , when fed the same HP number, but the weight was cut 500 pounds to 2.800, reported an increase in mph to 109 and it dropped the e.t. from 12.95 to 12.26-seconds. No other changes.
Like I said, those numbers are not exact, but they probably represent a good "ballpark" guess.
A 300 HP, normally-aspirated, slant six would be a HOSS!!!:cheers:
That's 1.33 horsepower-per-cubic-inch.
Guzzi Mark Ethridge's Valiant runs 11.50 @ 2,350-pounds; and that's 305 HP according to this online calculator.
Mark's car is a rocket, and has pretty much, a full-race engine, I think.
It would take something pretty special to beat his performance on gas/no power-adder.
