MTI R1 vs. FM 9

Reply Subscribe

Thread Tools

Search this Thread

Jan 17, 2005 | 08:17 PM

Steve Gunn

Thread Starter

TECH Resident

Joined: Feb 2002

Posts: 843

Likes: 0

From: Roseville, Ca.

MTI R1 vs. FM 9

Could you guys tell me how much power I am missing out on by having a lower lift cam (R1) vs. a same duration cam with higher lift? (F9)

To keep it simple, lets just say they have the same ramp rates.

MTI R1: 232/236 .575/.578 114
vs
Futral F9: 232/236 .585/.598 114

Should I be regretting my relatively low lift?
Is there ANY upside?

My car will be dyno'd as soon as it is broken in. I'll be spraying a 150 shot.
Anyone shed some light?

Thanks!

Jan 17, 2005 | 08:41 PM

DavidNJ

TECH Resident

Joined: Dec 2004

Posts: 881

Likes: 1

[QUOTE=Steve Gunn]Could you guys tell me how much power I am missing out on by having a lower lift cam (R1) vs. a same duration cam with higher lift? (F9)

To keep it simple, lets just say they have the same ramp rates.

MTI R1: 232/236 .575/.578 114
vs
Futral F9: 232/236 .585/.598 114

Should I be regretting my relatively low lift?

Quote:

You have a big cam and a heavily modified motor. More lift would have been a good idea. With a forged 347, how may revs do you turn? However, that is .575, not .525, so its not going to be that much different.

Is there ANY upside?

Quote:

Less stress on the valvetrain, especially the springs.

Jan 17, 2005 | 08:45 PM

narcszm

TECH Enthusiast

Joined: Jul 2004

Posts: 546

Likes: 1

From: Washington

totally depends on your heads / valves. How much do they flow at .600 vs .550? If there's a 10% difference there, you're probably missing out on 2-4% difference in power, so maybe 15HP at best. I wouldn't change it; ten thou is not very much, and your valve springs will just last that much longer.