Bill Ball

Watch it! That is going to skew Mark's statistics all to hell. Could it be that the oil brand isn't really a factor?

johnb

My engine is a M28/21 with a C/R of 10.4

Mark, could be interested, especially with the pound/dollar as it is now!

Let me know if you are interested.

rods and crank $300
almost brand new euro 4.7 , $1500

What engine is it that you have?
What has it had done to it?
Has the crank been ground, if so, by how much?

Larry928GTS

No it won't. He'll just ignore those facts.

heinrich

I beg to differ sir A long lefthand sweeper, a nice sunny day, entering or leaving th freeway at high revs and BOOM!!

heinrich

Stan thanks for the info so ultimately there is no fix is what we're saying.

Jim bailey - 928 International

Heinrich you would need to spend 15-20 minutes circling the cloverleaf at high RPM high side loads just to approach one run session in the typical drivers education event where you get 4 or 5 runs per day. J. Kim Crumb circulated a paper nearly 20 years ago pointing out that the "944 disease" number 2 rod bearing failure ALSO infected the 928 and that after some 10-12 hours of agressive track time many will have bearing problems. I think he personally had it happen at least three times (four if you count the car he sold which failed at it's next track event). All the stroker cranks are drilled like a Chevy and feed oil from a different main bearing to #2,#6 and they do NOT have 2-6 failures. A shop in Germany claims that they can modify the lower cradle to eliminate the oiling problem but do not wish to "share" that information. Kiborts Holbert car engine may or may not have a stock bottom end ? The early engines used a different oil pump pickup arraingement and do not seem to have the same frequency of 2-6 failure BUT I personally killed one early engine at the Big Willow Track in about 15 minutes ! The accusump is a bandaid which seems to help some of the people some of the time. One of David Lloyds engine failure he forgot to open the valve on the accusump as I recall, they only help if you use them

Bill Ball

When we took apart Dennis's motor, Jim Morton pointed out some features of the oil galleys in the cradle that appear to reduce the flow that 2/6 gets.

UKKid35

Hi John

Really sorry to hear about your engine failure. I didn't get to speak to you on the day, but many others reported how philosophical you were about the whole situation.

Also a big thanks for lending Joel your Ignition Amps, which gave him another chance to get out on the track.

Good luck with the repair.

heinrich

Bill, care to share please? Jim, yes this is where I have issues with the comon knowledge -- if an accusump fails to protect you because you never turned it on or you went off-track and cut the feed line, that cannot be considered an accusump failure. But I am intrigued, so NOT ONE 928 has failed 2/6 after receiving the Chevy drilling? I wil send my GTS crank away this week if o .... please confirm
Best,
Heinrich

Charley B

I hope you're referring to knuckles on wood.
I'm embarrassed to admit, I some how look forward to the day the Holbert engine gives it up, so we can find out what secrets lay within.
Of course, I'm also pulling for you in the championship this year, so it does even out.

Nicole

That's Turbo-Uli. He used to post on the German 928-board, and has responded to posts here some time ago. If anyone is seriously interested in using his services, I'll be happy to help in contacting him.

Stan.Shaw@Excell.Net

drysump with drilled crank is the answer

Stan.Shaw@Excell.Net

David Lloyd had a failure with Amsoil and drilled crank, as I recall. Jim is correct (of course ) that there was one incident where the accusump was not turned on. I was responding to the original question about whether there had been a failure with Amsoil.

Bill Ball

Take a look at the cradle where the main that feeds 2/6 gets its oil and compare to the rest of the galley outlets. I don't have the engineering background to say more. Jim wants to do some flow testing. As to the drilling, I don't know if that is true, and the drilling can be done different ways with different passage sizes and other features such as center drilling. I haven't gotten that far yet. Still studying.

Jim Morton

Heinrich:

Bill, Dennis and I are going to be testing the flow of the bottom end and possibly making some mods. I am sure we'll take pictures of the pieces and tests with the intent of posting what we find. My experience making hydraulic distribution manifolds is what tells me the #2 crank journal is ligther fed than the rest. The position and shape of the galley lateral looks lesser than the others. The trick will be deciding an improvement. Hopefully Dennis will let us mod his toasted block before we do one of the two good blocks we have.

Right now and through this weekend, I am still elbow deep in de-sliming all of the parts and prepping them for measurement and testing. Damn, I hate the smell of old, burned engine oil. Yuk...

Stay tuned !