JohnKoaWood

Can someone get Chris White to weigh in?

bebbetufs

Even cheaper here.
Has anyone actually run these bearings and can verify that they fit and that they are no worse than stock? I'm looking for a set of rod bearings right now

carlege

If the 928 guys can verify then i bet they do work with our cars and are an improvement over Glyco ones

txhokie4life

Sorry I missed this, I didn't pull the bearings myself
I'll ask our engine guy if he noticed.

Mike

whalebird

I would be curious as well. I wonder if the bearings are really the problem though. I understand the problem to be an oiling issue, and a Nascar bearing will fail without oil like any other, no?

M758

That is my belief.

whalebird

good read here
http://www.aa1car.com/library/ar797.htm

Scroll down to "bearing material". Keep in mind, Federal Mogul manufactures our Glyco bearings.

LUV2SPEED2

I believe in replace rod bearings every season with coated bearings. The one time i let it go past one season I lost the engine. Swain coating is cheap insurance.

Al

Oddjob

Agree. Harder bearing material will just cause more wear/damage to the crank journal if the oil supply is inadequate.

Strosek Ultra

Here you will find detailed informations on Clevite engine bearings. http://mahleclevite.com/publications/EB-10-07.pdf. Read the technical part and about High Performance/Race Applications. The Clevite Trimetal rod bearings are far superior to the Aluminium Bimetal Glyco factory bearings. Never ever use alumium bearings in a high performance application. Use Clevite bearings of the TM77 material for high performance. As said by Michael Mount in post #9 you can grind down the rod journal to Chevy 327 size (2.000") and use NASCAR type performance rod bearings (CB-1271P). Custom made rods are required. Doing some research I found the Toyota V6 NASCAR type rod bearing CB-1628H (CB-1628HX for more oil clearence). This top of the line bearing will fit right in using the factory crank and rods for the Porsche 928, 944 and 968. The 1628 bearing is smaller in width (.7600") compared to the factory Glyco bearing (.9449"). According to all experts I have consulted this should not be an issue. Remember a Toyota V6 high performance turbo engine do put out way over 150HP per cylinder. On 928 stroker engines up to 7,4L the most common setup is using Chevy SB H-profile rods and Clevite CB-663HN (.7920" wide) NASCAR type rod bearings. I have been in this game for more than 45 years and experienced many rod bearing failures. In the old days, for certain applications, we used diesel engine bearings which usually are harder and it worked. Somebody said hard bearing material will wear down the journals which I do not believe. Maybe somebody like to install racing bearings in a street car and drive it for 300.000 miles and take it apart and see if we can measure any wear.

Ake

PS The Chevy CB-663HN bearings do cost even less, I have paid $ 7.49 ea (per rod).

SeanR

I'm finding this discussion very informative. Keep it up.

carlege

I have never experienced a Spun rod bearing but inadequate oil supply seems to be a result of worn rod bearings. So a harder bearing would be beneficial

bebbetufs

I guess they don't make a too wide version we can grind down?

bebbetufs

I am intrigued by the windage ports Porsche introduced with the larger blocks 2.7, 3L, and I have been reading up on it. I'm starting to believe this might be the most overlooked detail in all the discussions on the #2 failures.

There is an article on it in the Lindsey newsletter [URL="http://www.lindseyracing.com/hptalk/0808.htm"]here[/URL (scroll down, or search for "Shop Talk")

The thought is that a windage port cut above the bearing between cylinders 1-2 and 3-4 will allow the air trapped below the piston to move freely from cylinder to cylinder without blowing past the crank and frothing up the oil. I'm wondering if it could not be blowing the oil out of the gap between the sides of the rods and the sides of the journals, possibly pulling the oil film out of the bearings in the process. Perhaps the pressure builds up the highest in cylinder 2? The port between cylinders 1-2 looks bigger than the one between cylinders 2-3 .

txhokie4life

Great stuff guys.

Thx