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boosted 89's Avatar
 
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930 camshaft selection.

Hey guys and gals. Its been a while since I've visited the forum but here I am. I have a question that i hope I can get some different inputs for the group. I currently have an
1989 930 factory slantnose which I have decided to freshen up the engine with new bearings, seals , rings etc. I have run into a dilemma with the right camshaft showing
wear and slight pitting on #6 camshaft lobes..plus the rocker has a wavy slider face. It almost looks like oil starvation. I have since check the oil feed and squirter holes to ensure a clear and clean passage. Anyways, I am looking for suggestions on replacing the camshafts with something more performance oriented. I do have stock size 97mm Mahle cylinders and pistons(flat top). I am not looking for camshafts with too much lift or duration to warrant having to cut valve reliefs into my pistons. I still have the CIS injection, BB headers,K27 7200 turbo and Kokeln intercooler. I have modified my WUR for adjustment and also use a RPM vacuum switch. Any help is greatly appreciated.

Thank You
Chris

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Chris
89 930 slantnose M505
k27, BB headers,kokeln I/C
Old 05-18-2020, 09:24 AM
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I have Sc cams same setup as you and love them
Old 05-18-2020, 11:54 AM
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Sounds like a real gem of a car you got there - DEMAND FOR PICS before giving any answer!!!

OK, with that out of the way...

Common options are SC or 964 cams - SC better down low / 964 better up high.

I ran SC's with a large turbo / IC / headers / etc. and loved it! They very much transform the powerband and driving experience coupled with the mods you've already got!!!

I'm in the midst of a rebuild and am likely moving to 964's to compliment a 3.5 setup. I've had such amazing offers of support from so many folks here, I'd like to give back - you can have my take-off's if you'd like (assuming I do get the 964s, should know w/in week).

Probably need nominal cleanup, but my (Porsche race) shop did see them and say "we've put worse cams back in cars than those" (and they're pretty picky), so you should be good to go.

PM me if interested, otherwise good luck!
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Paul... CT | '87 930 | '08 M3 6gang vert |
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| '07 S6 | '98 M3 vert | '01 M5 | '96 993 C2 cab | '05 S600 Sport - biturbo V12@Just Not Right 495rwhp / 612rwtq |
| '58 TR3A | '01 S8 | '95 S6 6gang | '88 M5 | '87 190E 2.3-16 |
Old 05-18-2020, 12:07 PM
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Quote:
Originally Posted by ertech View Post
I have Sc cams same setup as you and love them
Are the SC cams regrinds..do they have the boss on the left cam for scavenge pump?

Chris
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89 930 slantnose M505
k27, BB headers,kokeln I/C
Old 05-18-2020, 12:10 PM
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mine are not re-grinds / taken off my 930 so yes have the end pins for oil pump drive
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Paul... CT | '87 930 | '08 M3 6gang vert |
past:

| '07 S6 | '98 M3 vert | '01 M5 | '96 993 C2 cab | '05 S600 Sport - biturbo V12@Just Not Right 495rwhp / 612rwtq |
| '58 TR3A | '01 S8 | '95 S6 6gang | '88 M5 | '87 190E 2.3-16 |
Old 05-18-2020, 12:14 PM
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I had a similar experience with pitting on a couple lobes.
I sent the cams and rockers to Elgin Cams due to a recommendation by Chris at Turbokraft.
Elgin rebuilt the rockers and reground the cams to a custom sport grind that is slightly less aggressive than the SC grind.

The thing is webcam and some will grind whatever you ask for and leave you with a base circle that is too small. Dema won't do that. That's why I have a sport grind and not a SC. The end result is just fine though. Car runs great.
And the whole thing was a lot cheaper than new cams.



https://elgincams.com/

Elgin does the rocker restoration for Ed Pink Racing. Quality work.
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Old 05-18-2020, 12:40 PM
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I send mine out to put the scavenge parts
Make sure you get late sc cams Since the fronts are different
Old 05-18-2020, 06:19 PM
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Derrick,

I had a set of cams ground by Elgin Cams also. When I measure them I thought they were less aggressive than the SC grind, but wasn't sure I was measuring accurately. What you said above makes sense. I was curious as to what you set the cam timing to. the spec Elgin cams gave me was 1.8-2.0mm. Did you set cams advanced or retarded to these spec or in the middle at 1.9mm? Do you have an opinion as to what might be a "best" setting now that you have real world experience with these cams?

Rahl
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Drive it like you hate it! 1976 930 Turbo Carrera, Mostly stock...Lightly sweetened
Old 05-22-2020, 09:43 PM
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Chris

I just went through this as well and am happy with the change to SC cams - my other mods are similar to yours. Interestingly my cams and rockers were in excellent shape even at almost 300,000km on the engine. Which shop are you using?
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1982 930, K27-7200, Ruf wheels, Leask WUR, Tial WG, RarlyL8 headers & single out muffler, SC cams, TK I/C
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Old 05-25-2020, 12:30 PM
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Quote:
Originally Posted by 356911930 View Post
Derrick,

I had a set of cams ground by Elgin Cams also. When I measure them I thought they were less aggressive than the SC grind, but wasn't sure I was measuring accurately. What you said above makes sense. I was curious as to what you set the cam timing to. the spec Elgin cams gave me was 1.8-2.0mm. Did you set cams advanced or retarded to these spec or in the middle at 1.9mm? Do you have an opinion as to what might be a "best" setting now that you have real world experience with these cams?

Rahl
Real world: set them full advance, 2.0mm.
The more advanced they are, the more you're helping lower rpm power, and you want all the off-boost, low rpm driveability you can get.
Boost will take care of the rest.
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Old 05-25-2020, 01:43 PM
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Thanks Chris! I really appreciate your contributions to the Turbo forum over the years...very nice.

Best regards,

Rahl
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Drive it like you hate it! 1976 930 Turbo Carrera, Mostly stock...Lightly sweetened
Old 05-25-2020, 09:36 PM
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Quote:
Originally Posted by 356911930 View Post
Thanks Chris! I really appreciate your contributions to the Turbo forum over the years...very nice.

Best regards,

Rahl
I set them to 2.0mm
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Old 05-26-2020, 07:53 AM
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Full advance on my 3.3 engine with 964 cam was 1.96mm.
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Old 05-26-2020, 09:57 PM
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Quote:
Originally Posted by TurboKraft View Post
Real world: set them full advance, 2.0mm.
The more advanced they are, the more you're helping lower rpm power, and you want all the off-boost, low rpm driveability you can get.
Boost will take care of the rest.
+1
Love my SC cams and K27/K29 turbo. Combined with a lightweight flywheel, my car gets off the line like a 427 FE block
When I was debating between SC cams and 964 cams, it seemed like some who had the 964 cams were complaining of reversion issue, mainly strong fuel odors in the cockpit. So I went with SC cams sourced from Webcam (welded and re-ground), phased as Chris has described.

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'91 964 3.3 Turbo
Port matched, SC cams, K27/K29 turbo, Roush Performance custom headers w/Tial MV-S dual wastegates, Rarlyl8 muffler, LWFW, GT2 clutch & PP, BL wur, factory RS shifter, RS mounts, FVD timing mod, Big Reds, H&R Coilovers, ESB spring plates- 210 lb

Last edited by 911nut; 06-24-2020 at 11:06 AM..
Old 06-04-2020, 05:48 AM
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