Need advice a 930 crankshaft
01-17-2008, 09:20 AM
#16
Racer
Join Date: Apr 2005
Location: Waiting for the pass behind you, or Sebastopol, CA
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Geoffrey, I thought about that last night after signing off. No, it doesn't make sense.
I thought the 3.2 and 3.3 could use the same rod bearings. I was told by SRP that they didn't make their racing bearings for the 3.3. Water under the bridge now, but I don't think I spoke with the right person.
I thought the 3.2 and 3.3 could use the same rod bearings. I was told by SRP that they didn't make their racing bearings for the 3.3. Water under the bridge now, but I don't think I spoke with the right person.
01-17-2008, 10:34 AM
#17
Intermediate
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Location: Mt Pleasant, SC
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Crank
talk to some of the old timers that have been around 930's forever...they'll tell you not to use synthetic...they told me that too...but of course I knew more than they did...and a turned rod insert was the result.. but..since most 930's are driven only a couple of thousand miles a year because they've been screwed with so much...or "performance enhanced" or "performance upgraded" to a dead stop...and synthetic oil in a 930 engine is part of coming to a dead stop. Who do you want to believe..a guy who goes 2000 miles a year...50% of that on a tow truck...or someone who drives a 930 20,000 miles a year...year after year.?
I've talked to some of the older guys (older then me!) and yes I hear them swear by mineral based oil, but that's what they grew up with, nothing more.
Tim
01-17-2008, 10:44 AM
#18
Nordschleife Master
Tim, on your fuel analysis, how was the fuel dilution levels? With the exception of Mobil 1 Extended Performance, I have had similar experiences with oil as you have had.
01-17-2008, 11:00 AM
#19
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Crank
Looking at the Analysis, it shows the fuel present was less than 1% per Parts Per Million. If I read it correctly, which is why I called them!
There conclusion was to continue to use the oil. But I changed it anyway.
I used to use M1 15/50, but switched to amsoil 20/50 racing about 23k miles ago.
01-21-2008, 11:27 AM
#23
Burning Brakes
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I'm running a refurb 964 crank and is center drilled. It gives me an extra mm on stroke, but I also have custom JE pistons so it would fit the rest of the 930 specs. The extra mm plus the 8.0:1 CR works great for me, specifically on low end. This engine is producing 525 hp, 505 torque, at 1 bar at the rear wheels.
01-22-2008, 04:04 PM
#24
Burning Brakes
Don..
So with the increase in stroke, you had to move the wristpin further towards the crown correct? What size pins 22 or 23mm, which rod 3.3 or 3.6.. and are you still 3.3 or 3.4 on bore?
Just curious as I have a spare motor with plans to build as EFI..
Still need:
machine work
Proper hardware
Pistons (98mm)
Decision on cams
Decision and purchase of ECU etc..
Sorry to go off topic guys...
P-
So with the increase in stroke, you had to move the wristpin further towards the crown correct? What size pins 22 or 23mm, which rod 3.3 or 3.6.. and are you still 3.3 or 3.4 on bore?
Just curious as I have a spare motor with plans to build as EFI..
Still need:
machine work
Proper hardware
Pistons (98mm)
Decision on cams
Decision and purchase of ECU etc..
Sorry to go off topic guys...
P-
