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dewolf's Avatar
 
Join Date: Jan 2007
Location: Australia
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Teetering on the slope

I think I'm going to drop the motor and give it a freshen up. One thing I want to do amongst others is put a set of lumpy sounding cams in it. Is this wise and if so am I better off going for a new cam or getting my existing ones re-ground?
I plan on going to a 7200 with headers and IC etc with adj. wur. Also can the barrels be bored 30thou?
Thanks
Scott
Old 06-14-2007, 12:27 AM
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My cams were stock 930 reground to SC profile by John "camgrinder".

SC/964 cams and higher compression will reduce off-boost lag - although the latter will also limit the maximum amount of boost you can run.

Most wrenches who drove my car with just SC cams and 8.0:1 C/R commented on how little lag it had even with stock (RoW) H/E's and 3DLZ.

The K27/HF is more modern (and thus desirable) than the 7200, people say.

Headers, turbo, SC cams will transform the car. I already had SC cams and 8.0:1, adding GHL's, a K27/HF and a Kokeln has made the car behave/drive completely differently.

Imagine Auto/Kevin announced a HyFlow S recently, but i forget if that's limited to EFI application only?

There's a few reasonably-priced ($2,000) sets of new Mahle 965 (fully-finned) barrels/pistons around at the moment, might be cheaper than reboring, depending what pistons you were going to put in afterwards....

BTW, it only looks like a slope from the top.
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'77 S with '78 930 power and a few other things.
Old 06-14-2007, 09:59 AM
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Old 06-14-2007, 08:22 PM
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where can those P&C's be found? I've tried a search to no avail.
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In Heaven… the mechanics are German, the chefs are French, the police are British, the lovers are Italian and everything is organized by the Swiss.
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Old 06-14-2007, 10:22 PM
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Try Andial, thats where I got mine. Great customer service! 2K seems a little low though as I recall. Make sure you look into flame ringing. It is a great idea and inexpensive to do while your in there. Of course too many "while your in theres" can be very expensive! Be careful with that! LOL!

Just my .02..................................Chris
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 06-14-2007, 11:05 PM
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Yes, those "while your in there" are the ones that seem to be bank account emptying, but power cost $$$$$ so I guess I'll have to bite the bullet. I don't want to go outrageous but would like a little over 400fwhp using CIS. We are a bit lucky here in Oz as all cars were Euro spec so my CIS should be up to the task. But I really want it to sound lumpy. We have a guy in our local Porsche club with a 3.2NA( I know it's different for NA motors) but it sounds fantastic at idle, very cammy.
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In Heaven… the mechanics are German, the chefs are French, the police are British, the lovers are Italian and everything is organized by the Swiss.
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Old 06-15-2007, 01:10 AM
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Quote:
Originally posted by dewolf
where can those P&C's be found? I've tried a search to no avail.
There was a thread on the Rennlist turbo forum, the guy was offering 20+ sets of brand new, boxed, Mahle 965 pistons and cylinders, initially for $1,550.

http://forums.rennlist.com/rennforums/showthread.php?p=3844705

A few people thought "too good to be true", a few people (including one who lived locally and physically collected his) bought them and found them to be exactly as described.

Last I checked (February/March) he had 17 sets left, offered @ $2,200 each. I came this >< close to buying a set just on general principle.

I no longer see them there, sorry y'all.

Quote:

But I really want it to sound lumpy. We have a guy in our local Porsche club with a 3.2NA( I know it's different for NA motors) but it sounds fantastic at idle, very cammy.


SC cams will give it a loping idle, and "really wakes up a 930 motor" (Chris Powell). I don't think 964 cams are very different, and I seem to remember reading here somewhere that 993TT cams are pretty much SC cams with different ramps for the hydraulic tensioners...

Raising static compression ratio a tad helps too. With an open "muffler", my 'Merkin friends remarked that it sounded like a '69 Camaro at idle. I fitted a muffler that didn't set off car alarms when I started getting the urge to wear a wifebeater and grow a mullet...

Although running 8.0:1 means you can't run 1 bar boost without 100 octane gas (thanks to this board), on reflection I'd rather have better off-boost characteristics - for a street car - than run the extra .2 bar of boost.
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'77 S with '78 930 power and a few other things.

Last edited by spuggy; 06-15-2007 at 02:51 AM..
Old 06-15-2007, 02:46 AM
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I have 964 cams that I had reground at Web Cams and they are pretty bouncy at idle. Could have helped that the car was running pretty fat at idle too tho.

Just a warning on Cams. Make sure if you are in a DEQ, or emissions controlled city that you meet their requirements unless you have registration alternatives. I found out AFTER installing my cams that there was a snowballs chance in hell that I would pass smog inspection so I had to get a "special interest" registration. Lucky that the state of Oregon offers that!

HTH..........................................Chris
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77 930 "P Zilla" 3.2 Litre w / EFI conversion
Old 06-15-2007, 07:18 AM
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