Engine "Braking".......Does it hurt the motor ???

[Chris Hill]

My gut says no, but I think Jeff is correct on the rod being loaded more. If your engine is running 7,000+ rpm, then you let off the gas, vaccum in the intake system goes through the roof. Intake runs high vaccum, not much air if any is compressed during compression stroke and the net load on the rod may be greater than at the top of exhaust stroke when rod is slowing down the piston. You would have to look at cylinder pressure traces to make sure though.

But to answer Rusty's original question, we've done it both ways with our stockers, and both ways seem to work ok

[Lambertcars]

You dont see much engine failure in nascar and they are basically doing the same thing.

Allen lambert

[SSDiv6]

Originally Posted by Lambertcars

You dont see much engine failure in nascar and they are basically doing the same thing.

Allen lambert

However, NASCAR engines run rotating components, heavier oil weights, less spring pressure and smaller cams. Jeff Lee, Chris Hill and GMonda covered many of the issues. Engines with aluminum rods are more suceptible to damage than steel rod engines.

My recommendation is to click the engine "off" and not "Engine Brake"; you are not driving a Diesel truck.

[trmnatr]

Originally Posted by SSDiv6

However, NASCAR engines run rotating components, heavier oil weights, less spring pressure and smaller cams. Jeff Lee, Chris Hill and GMonda covered many of the issues. Engines with aluminum rods are more suceptible to damage than steel rod engines.

My recommendation is to click the engine "off" and not "Engine Brake"; you are not driving a Diesel truck.

See post #6, What about a small block that run 8,100-8,400rpm past the lights with aluminum rods and a TH400 automatic that is a transbrake so it is a reverse valve body so you cant put it in Neutral

[SSDiv6]

Originally Posted by trmnatr

See post #6, What about a small block that run 8,100-8,400rpm past the lights with aluminum rods and a TH400 automatic that is a transbrake so it is a reverse valve body so you cant put it in Neutral

Use a Precision Performance Products Kwik-Shift-1, ProHydro shifter with the safety neutral shifter
(P/N 408) The shift pattern is P N/R 1 2 3 N, reverse is neutral position with trans-brake engaged.

http://www.precisionperformance.com/power1.htm

http://www.precisionperformance.com/faq.htm#faq8

[trmnatr]

Originally Posted by SSDiv6

Use a Precision Performance Products Kwik-Shift-1, ProHydro shifter with the safety neutral shifter
(P/N 408) The shift pattern is P N/R 1 2 3 N, reverse is neutral position with trans-brake engaged.

http://www.precisionperformance.com/power1.htm

http://www.precisionperformance.com/faq.htm#faq8

Is there too much engine braking with a transbrake that doesnt use a front band? Would that sort of transbrake do any harm? Its a Hughes/JW style and doesnt use a front band

[Real Racer]

If engine braking is suposed to be so bad, I wonder what kind of damage all of the top end womp womping is doing?