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Thread: High vs low RPM
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11-01-2010 #41
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Yes. I think it's going to be REAL hard to control 700lbs unless the chassis has a lot more money and time spent on it than the engine. JMHO. I'm still trying to figure out how to control the 600lbs I've got.
Originally Posted by 79-TA
'66 GTO Vert Project "Red Ink", 462ci of stroked pontiac power, TKO600, SC&C Stg II+, Tubular lowers, Currectrac Rear suspension, Moser 12bolt w/Truetrack, Wilwood Master and discs all around, too much fun for words...
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11-02-2010 #42
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McClaren used Aliminum Big-Block Chevys , and ran very well in the Can-Am Series in the late 60's/early 70's.
Ferrari entered the 512( 5.0 liter V-12) and 712( 7.0 liter V-12 ) in the Can Am , but did not compete very well with the big bore American powerplants ..
For a street-car , torque is king , whether you use a small block or big block to make it.
Low RPM cruising saves engine wear and yields better gas mileage .
On a race car , often times there are engine size limitations , and the higher RPM makes more horsepower for a given cubic inches.Last edited by JEFFTATE; 11-02-2010 at 12:54 PM.
Jeff Tate
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"The best thing about participating in these events is that you get to hang out with a group of intelligent like minded people who live to achieve things in their lives. You won't find a lazy, mean, or dumb bone in their bodies." Bret Voelkel, RideTech
11-02-2010 #43
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Yup, engines are basically an air pump...the more air/fuel you can pump through them, the more power, and if cubes are limited, then you have no choice but to increase the revs to get more air/fuel through the n/a engine. Originally Posted by JEFFTATE
1970 RS/SS350 139K on the clock:
89 TPI motor w/ 1pc rear seal coupled to a Viper T56 via Mcleod's modular bellhousing w/ hydraulic T/O bearing from the Viper, 12 bolt rear w/ 3.73 gearing, SC&C upper control arms, factory lowers with Delalums, C5 brakes at all four corners, Front Wheels 17x8's with Sumi 255/40/17 and Rear Wheels 17x9's with Sumi 275/40/17.
Brief description of the work done so far can be found here: http://www.nastyz28.com/forum/showthread.php?t=112454
11-03-2010 #44
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It has always seemed to be that if you couldn't rev past 5250 RPM torque was all you could count on which made the big blocks feasable with taller rear gears to go forever in the old days and it is still the same today. The killer HP that a big block makes when you spin it up is exponential.
I have trouble with 400 ft lb of torque staying planted in 1st and 2nd so that much power would take it to 3rd and 4th and that is very fast territory and you better have room if you plan to light them up, which will happen too easily with little pedal travel. I have a lot of experience to gain to be able to be in total control at the 3 digit speeds on a track where each lap is different because of all the factors involved. Brakes always change a little and stopping is where a lot is gained in time.
I truly think that no matter what engine he puts in the car it will be as much as he expecting and more ! I hope he gets what he wants and likes it.May The Horsepower Be With You !!!
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