M758

Accusump = 9qts on the track vs 6 qts when the motor pops....


Really given the nature of our engines I am not sure how the accusump would help. Once you lose pressure you are done. Most guys don't spin bearings on low oil pressure. They do it on normal oil pressure.

M758

I use a temp sensor in my drain plug and my highest temps are 260 oil. Never as high as 280. I run a turbo oil cooler. I run in some hot conditions of over 100F, but don't run 24 hrs. The other thing I heard on these motors was to never run enduros. ... How often do you check the oil during an event? These cars can burn oil and after 3 hrs of racing you could be rather low.

V2Rocket

Curious, what RPM do you guys run your Spec cars to? Peak power is 5500-5800 or thereabouts, any real point going into the 6000s unless you're going for speed in gear?

Considering putting the rev limit of my motor at 6000 when the supercharger goes on in coming months for blower longevity.

M758

6000 RPM for most shifts, but up to 6200 rpm whne I am really ringing out. Sure you lose power that high, but there is still more power to ground at 6200 rpm in 3rd than 4000 in 4th for example. I have seen this side by side when racing wheret the guy in front shifts and you stay on it for 200 more rpm and close a little bit. Most noticeable in 4th to 5th shift even with shorer .829 5th gear.

txhokie4life

Since we are running endurance races we generally shift around 5500.
We'll push it to maybe 5800-6000 a times.

we check the oil generally every other fuel change -- ~4 hours.

We're planning to run a larger oil cooler this year -- just trying to figure out where to put it
and whether it is active (fan) or passive..

Contact is a concern as occasionally there is rubbing during our racing :-(

Endurance races can be anywhere from back to back 7 hour days to a full 24 hours.

Mike

michaelmount123

Mike txhokie4life,
Had a question about the rod bearings you pulled from your engine a few responses back. Answer if you can. You may not have an oiling problem at all.
Thanks,
MM

Strosek Ultra

Failing rod bearings is well known in the 928 community. Many good things has been said here but the main cause is the factory Glyco rod bearing which is way, way too soft. For my 6,0 litre having a GTS crank and factory rods I will use the Clevite high performance Nascar rod bearings CB-1628HX. These bearings will also fit the 944 and 968.

Ake

carlege

Really? for a Stock 944/951 and 968?

http://www.race-mart.com/Clevite-CLE-CB-1628HX.html
each for $20 bucks?

M758

No looks like the pricing is $20 EACH. No idea on fit however.

carlege

Ah i didnt see that. Still puts it at cheaper than stock bearings.

M758

It is a a wash. Stock bearings are $82 a set.

carlege

Not if these are designed better and are better quality.

Cris Brady

This store looks likes it's $20 for a set of 6:

http://thmotorsports.com/clevite_77/.../i-463692.aspx

carlege

"CLEVITE BEARINGS ARE SOLD AS PAIRED ‘SETS’ (TWO BEARINGS, FOR ONE ROD) UNLESS OTHERWISE NOTED. FOR A 6 CYLINDER, YOU SHOULD ORDER QUANTITY: 6"

Yeah they fooled me too. But if what they say about the quality being better. then at the price its worth a shot.

Cris Brady

Yup, you're right. They post Set of 6 in big letters everybody, and sneak that quantity disclaimer down at the bottom. I agree though, still worth trying a set.