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hoyabear hoyabear is offline
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Join Date: Feb 2008
Location: Seekonk, MA
Posts: 142
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I seem to have a similar build to you, and I believe I also have a similar problem

I see that your car is also running hot. Mine runs about 8:30 cruising on a cool day, 9:00 if caught in traffic on a cool day, and will easily get up to 10:00+ if it is hot out and I'm in traffic.

This is definitely running WAY hot for a 930 and needs to be dealt with. I also had a previous problem with oil going past the turbo seals (Bruin had PM'd me discussing a similar problem the PO of his car had with turbos), in the end I found out that it wasn't the turbo's fault. The issue was, the car was running so damn hot that the oil would hit the turbo and coke up into little bits. These bits would then get stuck in the scavenge line right before the pump, blocking the return of the oil. The oil would then back up in the turbo and go through the seals causing a huge amount of smoke.

I've solved the first problem by implementing a service regimen that involves checking the return line for blockage every 500 miles. Now, to get at the root cause of the problem, high operating temps, I have to do some more work:

My car is an 86 and didn't come with a fan for the right front oil cooler, with the modifications that have been done, I don't think the stock cooling system can keep up. I think that adding a fan may be enough to do the trick. If not, I will look to put on a big center mount oil cooler ($$$) in addition to this and if that doesn't solve the problem, there are some other places to look (although I will be fiddling with some of these variables as well over the summer).

Another angle to consider is ignition timing, if it isn't set right the car can run hot. I just put in a programmable MSD, so screwing around with timing is on the agenda anyway.

AFRs (to a lesser degree) are also a concern, do you know where your car stands in this respect? Right now I have my car running on the rich side to be safe (running lean car cause a car to run on the hot side), but I am going to tune this so that it is optimum, along with the ignition, as soon as I get a chance.

Hope this helps, if anyone else has some thoughts, please chime in!
'86 930: 3.4 Andial build, Web GT2 Evo cams, Carrillo rods, ported/polished heads, MSD 6530, B&B headers/exh + intercooler, K27HF, 1 bar spring, Tial wastegate, Andial FE, Lindsey Fuchs. Back in black!!!
Past:997S cab; '88 930; '86 951; C5 Vette; 4th Gen Z28; 3rd Gen Trans Am GTA; '71 Z28
Old 05-28-2010, 10:13 AM
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