Question about valvetrain noise

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May 14, 2004 | 10:45 AM

boos2

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From: Houston, TX

Question about valvetrain noise

Will there be a significant difference in valvetrain noise between a cam that has .581 lift and one that has .561 lift? Given all else (duration and LSA) are all the same. I know what a .581 lift cam sounds like.

For example only:
Would there be a diff. in the valvetrain noise between MTI's C2 224/224 .581/.581 on a 114 LSA
and
Thunder Racings TR224 cam
224/224 .561/.561 on a 114 LSA

Thanks.

Mike

May 14, 2004 | 10:54 AM

Kurtomac

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From: Okinawa, Japan

3 or 4 local guys used the comp 216 220 532 525 114 cam which is a mild slow *** ramp cam with 918 springs on stock heads they had the biggest sewing machines ive heard....i ventured out and put a 224 224 581 581 112+2 in XER (Xtreme energy fast ramp cam)......my valve train was 10 Times quieter than theirs and i was using 918s as well.....ive since added heads with 987 dual springs and a FMS F13 cam and the valvetrain is louder yet still quieter than a lot of other cars ive heard....i think all cars are different, unless youre gonna spray or got an automatic get the C2 cam on a 112, youll like it lopes just nice and driveability kicks ***

May 14, 2004 | 10:59 AM

boos2

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I already have a cam this was something that came up in a discussion with a friend who has a C2 cam.

May 14, 2004 | 01:05 PM

MyLS1Hauls

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Its not really peak lift that determines valvetrain noise...its mainly due to ramp rate...the valve size also makes a difference as do tolerances in the valvetrain...i.e. lifter preload.

May 14, 2004 | 02:06 PM

94form2000z

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Quote:

Originally Posted by Kurtomac

Wow that seems *** backwards to everything I've ever seen.

Quote:

Originally Posted by Kurtomac

ive since added heads with 987 dual springs and a FMS F13 cam and the valvetrain is louder yet still quieter than a lot of other cars ive heard....i think all cars are different, unless youre gonna spray or got an automatic get the C2 cam on a 112, youll like it lopes just nice and driveability kicks ***

Also how are the 987's holding up to that cam? I know you have them working on the very edge of what they are rated. Got any Dyno's you can post?

May 14, 2004 | 02:34 PM

Kurtomac

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From: Okinawa, Japan

Quote:

Originally Posted by 94form2000z

Wow that seems *** backwards to everything I've ever seen.

Also how are the 987's holding up to that cam? I know you have them working on the very edge of what they are rated. Got any Dyno's you can post?

yea that is assbackwards...my 987s have bout 8000 miles on them and are holding up fine....heres a graph within a 1000 miles ago ran them to 6800 on the dyno

May 14, 2004 | 02:53 PM

94form2000z

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From: Arlington, TX Congestion City

Quote:

Originally Posted by Kurtomac

yea that is assbackwards...my 987s have bout 8000 miles on them and are holding up fine....heres a graph within a 1000 miles ago ran them to 6800 on the dyno[/IMG]

yeah I've got about 8k on mine with a 588 lift cam. No issues whatsoever here either. Although I've thought of going a little bigger on my setup and didn't want to really change springs. Thanks for the info. Any other mods on yours? I don't see your sig. I'm assuming your car is a m6.