SC cams in 930 Turbo

[camgrinder]

If anyone has used an SC camshaft in a 930 turbo please contact me. I usually get feedback from engine builders or racers.
I would like to hear from the guy who owns the car for a change.
SC cams or Sport-SC cams are the most popular grind we do for turbo cars.
I know they make more HP, but im more concerned with the driveability before and after the camshaft change.

Thanks

[BURN-BROS]

Hey John, I can't help with this but I am subscribing to the thread because it is a mod I am thinking of doing. Whoever responds should also say what he has done to the car such as exhaust and boost.


Do you guys do billet cams? I know its a weird question but humor me. If yes can you p.m. me? Thanks a bunch Aaron

[dean]

Hey John,
I can't help either. But I am looking forward to installing new cams next winter. So I am interested in what cams to buy.
Thanks
Dean

[beepbeep]

RareyL8 has SC cams on 930 engine I believe. You can try and send a PM to him.

[hobieboy]

I just installed the Elgin SC cam in mine & had my 1st track event.
I had an unknown CAM before so my comparison is not quite what John is looking for. My original seems to have total lift of the GroupB cam but less overall timing.
Comparing before/after - off-boost torque on the SC cam is definitley better. And I'm surprised based on what I read that it pulls strongly to red line (ok - 6600rpm) as opposed to most who said they start to fall off at 5,000.
Probably the biggest driveability issue for me is take off from 1st gear, but I think its more a CIS issue. The 3 second laziness.
HTHs...

[WERK I]

John,
I recently rebuilt the 930 with the following mods;
Twin Plug
Web Cams (SC grind) sorry, John
B&B Headers/Muffler
Kokeln IC
Andial Fuel Enrichment
Tial Wastegate (.8bar)
K-27 7006 Turbo
The 930S came with a factory SC cam. While I can't attest to the factory 930 grind, I can say that the driveability of the car at low engine speeds(1000-2500RPM) isn't the greatest. Still, it's probably better than the factory 930 grind. I also have a 78 911SC which feels like it has more low RPM punch than the 930. The contributing factor has to be the low compression of the 930. All that aside, I think the SC grind is probably the best cam for the street. It has a nice sweet spot from 2800RPM on up to 5500RPM where it runs out of breath. I think the cam has a little more to give, but the turbocharger is past its limit at higher RPM's.

[camgrinder]

Patrick- Do you remember the setting you used to install the cams?
Dave- I have never seen a turbo style cam with the scavenge pump drive on the end, with the SC profile. I have seen 930 cams and some have the 964 grind. Interesting.

I want to make a cam somewhere in between the SC and the 930 that gives more off turbo torque without sacrificing the on-turbo performance. If the k27 turbo is done at 5500 to 6000 I think its possible.

[WERK I]

John,
Porsche did a rather intresting thing to get the early SC cams into the 930S engines. They machined a collar that would mount onto the end of the end of the left cam driving the sump pump.
Pretty simple approach...it just requires longer allen bolts to mount the collar and at the same time, drive the sump pin. It looks a lot like the collar Porsche used on MFI engines to drive the high pressure circuit.

[5axis]

Hey I know this one.... I am running 330's in mine. It seems pretty healthy until I go over the K27 7200 flow around 6000. I got mine through Stephen at imagine.

Set to 1.91 per imagine auto. spec 1.8-2.0

I may be moving up to a K27 HF... I tend to go for a solid mid range push rather than a low end blast off.

david 89 turbo cab.

[BURN-BROS]

John, you have a pm.

[john walker's workshop]

i use them a lot, usually with a K27 swap. webcam either welds the 930 cams, or if i'm in a hurry, they use a billet for more money. way better around town/lower rpm response.

[89turbocabmike]

John, I have the Webcam billet SC's that I just did a few months ago. I had my engine out for a new clutch and some resealing. I had small chain cover gaskets leaks and basically rationalized myself into the upgrade. I went with the billets only due to time constraints, turn around time to regrind my cams would have been 2-3 weeks and I was underpressure to finish this "project" as this is my daily driver. I have been very happy with the upgrade though I had rather expected more of a performance bump. I timed them in the middle of the recommended specs (1.55). Current mods are Fabspeed single out exhaust, kokeln IC, k27-7006 and .9 bar No downside that I've noticed in the swap.

[thabaer]

BA has been advocating this for some time, he talks about it in at least one of his books. Don't remember how much he explains behind the reasoning, I might look for it tonight if I remember.

[RarlyL8]

I can give you a comparison from a different angle.
Mine was a 930 transplanted into an SC using the stock 915. The 930 engine has SC cams timed in the middle of the range. What I experienced from the first trip around the block was nothing short of incredible driveability. Off idle and before boost the SC cammed 930 with the 915 box has significantly more torque than the 3.0L it replaced. This is with a Euro exhaust and K27-7200.

[nreed]

John,

I am about to install sc330 that you made for me. I have just posted a question regarding valve spring height. BA's book recommends a height of 34.5 for both intake and exhaust. Do you know if this is correct?

Thanks and I will let you know how the cams work for me in a few days.

Norm

[350HP930]

Damn, I was hoping for some dyno numbers.

I will be putting the SC330 grind in my 930.

[camgrinder]

Norm- The 34.5mm valve spring setting sounds right to me.

[camgrinder]

Seems like which exhaust system and the type of k27 turbo could have more to do with the low speed than the SC cams.
Is there a version of the k27 that can make HP past 6000 rpms? K27 HF ?

PatrickT, Which turbo do you have ?

[hobieboy]

Hi John,
Sorry - been swamped with work to even check my favourite site

I'm using a K27-HF and timed my CAM to 1.575 (somewhere between 1.4-1.7 was the goal), and with the usual GHL header upgrade & fuel enrichment.

Just came back from 3 days of track but was breaking everything in at the time - the engine pulls strong all the way to ~6500 though I typically like to shift around 5800-6000rpm. Haven't dyno-ed it since I want to re-adjust the valves after my 1st run post rebuild.

[WERK I]

I was advised by Richard Clewett and Tech Support at Web Cams to set my timing as close to 1.4 as possible. They said staying close to the low side would improve the low-end torque. I got the cams set to 1.42. Oh boy, was that fun! :-(