MTI R1 vs. FM 9

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01-17-2005, 08:17 PM

Steve Gunn

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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!

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01-17-2005, 08:41 PM

DavidNJ

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[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.

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01-17-2005, 08:45 PM

narcszm

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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.