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dewolf's Avatar
 
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Aggressive cam grind

Does anyone have some specs for an aggressive sounding cam grind, I want it to sound lumpy. Power from 3-6500rpm I am having some stock 930 cams re-ground (or should I get SC cams and have them reground?) and want any suggestions at to grinds that others have used. I'll be fitting k27 and the all usual stuff and retaining CIS. Any input would be welcome.
Thanks
Scott
Old 06-24-2007, 04:51 AM
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You could go for a 964 grind to your cams. More aggressive than the SC cam.
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Old 06-24-2007, 07:47 AM
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Scott, you will be fighting a losing battle on two fronts....
1)., CIS does not like valve overlap (lumpy idle). It sends energy pulses up the intake and to the metering plate, which in turn, screws with your fuel flow.
2). Turbo cars do not do good with a lot of valve overlap. If, you have a large amount of overlap, you will start to blow the intake charge right out of the exhaust during the intake stroke.

If you really want a "lumpy sound" at idle.... buy a "zork" tube, which is a straight pipe right off of the turbo, instead of running a muffler. I don't run anything but that tube anymore. You will be amazed at how "lumpy" the car sounds at idle. It will also allow the turbo to spool up quicker, hense, a quicker car. And you will be amazed at how much the turbo quiets the motor down. It really isn't that loud. It will also allow you to hear the whistling sound from the turbo just about all the time... sounds awesome.

just my .02 cents.... Brad
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Old 06-24-2007, 10:59 AM
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Old 06-24-2007, 06:11 PM
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Quote:
Originally posted by turbobrat930
Scott, you will be fighting a losing battle on two fronts....
1)., CIS does not like valve overlap (lumpy idle). It sends energy pulses up the intake and to the metering plate, which in turn, screws with your fuel flow.
just my .02 cents.... Brad
That is not quite correct. It's correct for SC but not for turbo. Turbo has lot's of stuff upstream from intake (intercooler, plumbing, and turbo itself) so chances of pulses surviving a trip trough intercooler and turbo impeller in wrong direction are nill.
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Old 06-24-2007, 11:05 PM
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Quote:
Originally posted by beepbeep
That is not quite correct. It's correct for SC but not for turbo. Turbo has lot's of stuff upstream from intake (intercooler, plumbing, and turbo itself) so chances of pulses surviving a trip trough intercooler and turbo impeller in wrong direction are nill.
You know what? I think you are correct. I was thinking about CIS in general...and now that I think of it, you are right, there is several items that the pulse would have to pass through before it gets to the metering plate... I stand corrected....
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Old 06-25-2007, 12:52 AM
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I think 964 cams are about as radical as you should go with CIS. A straight through exhaust will probably do more for the idle sound than the cam anyway.

I've been told my car sounds like a like a big block V8 at low rpm. I don't think so, but it does sound like a car you don't want to mess with .
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Old 06-25-2007, 04:47 AM
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Quote:
Originally posted by turbobrat930
You know what? I think you are correct. I was thinking about CIS in general...and now that I think of it, you are right, there is several items that the pulse would have to pass through before it gets to the metering plate... I stand corrected....
No - you are more correct than not. The big cam pulses play hell in the turbo and the air metering plate.
Old 06-25-2007, 05:14 PM
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Old 06-26-2007, 06:11 PM
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You can actually tune your cams to have a choppy idle. Play with the cam timing a little and you'll see what I mean. They may not end up set in an optimum spot but you will see that there is more to a choppy idle than just the basic grind.
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Old 06-26-2007, 07:06 PM
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Quote:
Originally posted by DonE
No - you are more correct than not. The big cam pulses play hell in the turbo and the air metering plate.
I am by no means an expert on this, however the guy advising me may Qualify(Richard Clewitt). I was told about he overlap issues and that I could run 964 cams when I went to EFI. SC cams with a Zork sound pretty kewl.

Hell, I put a Zork on my Dog, and he sounds Kewl when he farts now.

ZORKS Rule!

Les
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Old 07-07-2007, 04:05 PM
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