high RPMs

03-11-2002, 12:56 PM

What makes a 4cylinder have such a high red line. and never loose power? dose it have to do with the valve spings having alot of room?

mustang17 · 03-11-2002, 01:37 PM

Well, first off, the amount of cylinders has nothing to do with RPM. Factors like, the engines stroke has much more to do with it. Engines with shorter strokes tend to rev much higher.

An F1 car, turbo, v-10 and 180ci, redlines at 17,000 rpm! It has huge cylinders, but a tiny stroke.

The problem is that short stroke, high reving motors may not make any low end power. The engine may start making real power at 6500 and redline at 8500.

I'm not sure what you mean by "and never loose power." They loose on the bottom end.

The valve train, cam, and parts duribilty also factor into an engines redline.

Unit 5302 · 03-11-2002, 03:40 PM

1988 Mustang LX 2.3L I-4. Redline 5,400rpm.

Yep, nothing to due with the number of cylinders. Camshaft profile, head design, fuel delivery. That's how you get the rpms.

03-12-2002, 02:11 AM

so it just dedends on the size of the stroke. and how long it take for the cylinder to go up and fire back down. basically the longer it take to get through all the four step the lower it will rev and have less top end.

i think i'm getting it know, thank you.

03-11-2002, 12:56 PM	#1
50DAVIDLX Guest Posts: n/a	high RPMs What makes a 4cylinder have such a high red line. and never loose power? dose it have to do with the valve spings having alot of room?

03-11-2002, 01:37 PM	#2
mustang17 Registered Member Join Date: Sep 2000 Location: Concord, MA, USA Posts: 264	Well, first off, the amount of cylinders has nothing to do with RPM. Factors like, the engines stroke has much more to do with it. Engines with shorter strokes tend to rev much higher. An F1 car, turbo, v-10 and 180ci, redlines at 17,000 rpm! It has huge cylinders, but a tiny stroke. The problem is that short stroke, high reving motors may not make any low end power. The engine may start making real power at 6500 and redline at 8500. I'm not sure what you mean by "and never loose power." They loose on the bottom end. The valve train, cam, and parts duribilty also factor into an engines redline. __________________ 1995 GT Black- Edelbrock- 6037's,Intake, cam,70mm TB,75mm pro-m,Equal length headers,3.73's and all the bolt on's. SOLD 12/5/01 NEW! Mercedes-Benz SLK 230 Red/Black. Kleemann boost increase on the way!

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03-11-2002, 03:40 PM	#3
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	1988 Mustang LX 2.3L I-4. Redline 5,400rpm. Yep, nothing to due with the number of cylinders. Camshaft profile, head design, fuel delivery. That's how you get the rpms.

03-12-2002, 02:11 AM	#4
50DAVIDLX Guest Posts: n/a	so it just dedends on the size of the stroke. and how long it take for the cylinder to go up and fire back down. basically the longer it take to get through all the four step the lower it will rev and have less top end. i think i'm getting it know, thank you.