When tuning what determines redline limit?
Thread Starter
Drifting
Joined: Aug 2019
Posts: 1,859
Likes: 1,264
From: Houston
When tuning what determines redline limit?
Assuming I have a cam in my car and a blower that is still making power to 7200...what's stopping from having it tuned to shift at 7500, 8000, 8200 rpms?
What's the limiting factor?
What's the limiting factor?
Burning Brakes
Joined: Sep 2022
Posts: 1,202
Likes: 569
From: MSP
assuming you have headroom for flow, strength of metal is going to be your limiting factor.
bearings, con rods, wristpins, the piston itself.. those take an exponentially harder beating as you raise RPMs.
bearings, con rods, wristpins, the piston itself.. those take an exponentially harder beating as you raise RPMs.
Thread Starter
Drifting
Joined: Aug 2019
Posts: 1,859
Likes: 1,264
From: Houston
I see. I'm going full forged on the bottom end and was curious. I'd love to raise the redline a bit to 7500 at least.
Race Director
Joined: Jul 2018
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From: San Antonio, TX/Mahopac, NY
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Pushrod engines run into issues above around 7500 rpm assuming high quality parts are used. Valve springs and rocker arms become almost maintenance items.
Frankly, you can set the redline where ever you want and your engine will determine if that is too high. If you are truly running top quality connecting rods, pistons and valve train components, 7500 redline seems reasonable.
Frankly, you can set the redline where ever you want and your engine will determine if that is too high. If you are truly running top quality connecting rods, pistons and valve train components, 7500 redline seems reasonable.
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,478
From: South Florida
You need the valve train to be able to handle 7200 RPM's. And if you do, then you need the bottom end built to handle the stress of 7200 RPMs. If this is a street car and you don't want to do a lot of maintenance then I wouldn't push it past 7000-7200. Once you go beyond this and into race car territory, things wear out much quicker.
Thread Starter
Drifting
Joined: Aug 2019
Posts: 1,859
Likes: 1,264
From: Houston
Pushrod engines run into issues above around 7500 rpm assuming high quality parts are used. Valve springs and rocker arms become almost maintenance items.
Frankly, you can set the redline where ever you want and your engine will determine if that is too high. If you are truly running top quality connecting rods, pistons and valve train components, 7500 redline seems reasonable.
Frankly, you can set the redline where ever you want and your engine will determine if that is too high. If you are truly running top quality connecting rods, pistons and valve train components, 7500 redline seems reasonable.
You need the valve train to be able to handle 7200 RPM's. And if you do, then you need the bottom end built to handle the stress of 7200 RPMs. If this is a street car and you don't want to do a lot of maintenance then I wouldn't push it past 7000-7200. Once you go beyond this and into race car territory, things wear out much quicker.
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