Kevin Johnson and crank scrapers.
01-30-2009, 12:12 PM
#46
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You probably already know this but FedEx Express takes care of all customs handling as part of the regular fee. Before we found a better way of doing it, my company was FedEx overnight shipping several hundred pound several hundred thousand dollar products across the border for less than FedEx/UPS/ltl ground would cost.
01-30-2009, 12:15 PM
#47
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Results of Amsoil in your engine =
01-30-2009, 12:48 PM
#48
Rennlist Member
From the report, Georges engine had many other possible issues. blown headgasket, possibly flooded the oil with water, detonation ,etc. I didnt have time to read all the 27pages of the failure discussion, but even amsoil has its limits.
What I have found is that amsoil does not have the thermal break down at the very high engine oil temps we run during 30-50min sprint races!
I think my record stands on its own. 175,000mile 4.7L with 50 race days, 5L part euro with 20 race days, and the holbert car with 105 race days. not to mention. 50 race days on Scots 4.5, and 20 race days on the new 5 liter part euro. Dont forget the new stroker, 15 race days and 2000miles so far.
No cooler, scraper, accusump, drysump, screens, separators, vents lines, or baffles. Just the stock stuff.
speculate all you want. But, the main factor that i think is related to engine failure is oil pressure reduced by viscosity breakdown, that ive seen plague a few other oils. (mobil 1, valvoline, castro). the strong synthetics like redline and amsoil didnt have the reduction of oil pressure at high temps (i.e. 240 to 260F) We are talking about bang off the rev limiter racing here too!
Joke about im racing on a time bomb, but is it just LUCK that has carried me through? hmmmm, too many years of racing wth a 928 with no issues.
Whatever Im doing is different than the ones that have failed.
mk
What I have found is that amsoil does not have the thermal break down at the very high engine oil temps we run during 30-50min sprint races!
I think my record stands on its own. 175,000mile 4.7L with 50 race days, 5L part euro with 20 race days, and the holbert car with 105 race days. not to mention. 50 race days on Scots 4.5, and 20 race days on the new 5 liter part euro. Dont forget the new stroker, 15 race days and 2000miles so far.
No cooler, scraper, accusump, drysump, screens, separators, vents lines, or baffles. Just the stock stuff.
speculate all you want. But, the main factor that i think is related to engine failure is oil pressure reduced by viscosity breakdown, that ive seen plague a few other oils. (mobil 1, valvoline, castro). the strong synthetics like redline and amsoil didnt have the reduction of oil pressure at high temps (i.e. 240 to 260F) We are talking about bang off the rev limiter racing here too!
Joke about im racing on a time bomb, but is it just LUCK that has carried me through? hmmmm, too many years of racing wth a 928 with no issues.
Whatever Im doing is different than the ones that have failed.
mk
01-30-2009, 01:52 PM
#49
Rennlist
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Pretty hard to look at those two completely blue crank journals, in the picture, and think that anything but bearing failure had much to do with that failure. The multiple piece rod caps also only occur when the rods quit rotating on the crankshaft....and the crankshaft keeps turning. Also note that, in the picture, that there is no indication of the "milkshake" associated with any water in the oil.
I don't know the history of the engine in the picture, but clearly, that is an extreme example of the 2/6 bearing failure. This example looks, walks, and talks like a duck.
I don't know the history of the engine in the picture, but clearly, that is an extreme example of the 2/6 bearing failure. This example looks, walks, and talks like a duck.
__________________
greg brown
714 879 9072
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Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
greg brown
714 879 9072
GregBBRD@aol.com
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
01-30-2009, 01:55 PM
#50
Rennlist Member
No doubt. the question is why.
mk
mk
Pretty hard to look at those two completely blue crank journals, in the picture, and think that anything but bearing failure had much to do with that failure. The multiple piece rod caps also only occur when the rods quit rotating on the crankshaft....and the crankshaft keeps turning. Also note that, in the picture, that there is no indication of the "milkshake" associated with any water in the oil.
I don't know the history of the engine in the picture, but clearly, that is an extreme example of the 2/6 bearing failure. This example looks, walks, and talks like a duck.
I don't know the history of the engine in the picture, but clearly, that is an extreme example of the 2/6 bearing failure. This example looks, walks, and talks like a duck.
01-30-2009, 02:16 PM
#51
Road Warrior
Rennlist Member
Rennlist Member
maybe mark doesn't drive fast enough? hahaha
I have a windage setup from doc brown (pics on my sharksite), seemed to settle down oil fluctuations on hard sweepers. could have been from dropping the pan and pickup a bit too. or using the gts oil control stuff. or magic torco synthetic oil.
will be moving up to r compund /60tw stuff this season, guess we'll see what happens then.
I have a windage setup from doc brown (pics on my sharksite), seemed to settle down oil fluctuations on hard sweepers. could have been from dropping the pan and pickup a bit too. or using the gts oil control stuff. or magic torco synthetic oil.
will be moving up to r compund /60tw stuff this season, guess we'll see what happens then.
01-30-2009, 02:40 PM
#52
Rennlist
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01-30-2009, 03:15 PM
#53
Race Car
Repeated detonation on 2/6 due to the stock 32V intake due to those cylinders running leaner than the rest?
https://rennlist.com/forums/6152806-post31.html
Dan
'91 928GT S/C
475hp/460lb.ft
https://rennlist.com/forums/6152806-post31.html
Dan
'91 928GT S/C
475hp/460lb.ft
01-30-2009, 03:26 PM
#55
Rennlist Member
The only failure ive seen on someone elses engine has been idling in the driveway. 
. Oh yeah, there was Scots mystery motor (# 2 of 5)* that lasted the drive to the track, 3 sessions and 10 laps of the race before this same 2-6 failure. But, from the looks of the pan and all the black sludge, its a wonder it even lasted that long 
mk
*
1. original 4.5 (several racing seasons)
2. mystery motor from who knows who supposed to be a built euro 4.7 lasts 100miles and 20 laps on the track before #2-6 fail.
3. rebuld mystery motor ( just new crank and bearings)of the mystery motor grenades on in the driveway starting up
4. used 4.7 euro block that we re-ringed runs perfect , but need more power and has a head gasket leak from not enough bolt torque. (assembly error) But lasts a season.
5. mystery motor 4.7 euro block, bored out to 5 liter and uses 5 liter pistons. (1 full racing season so far and running strong. posts 1:40.xx at laguna)
. Oh yeah, there was Scots mystery motor (# 2 of 5)* that lasted the drive to the track, 3 sessions and 10 laps of the race before this same 2-6 failure. But, from the looks of the pan and all the black sludge, its a wonder it even lasted that long mk
*
1. original 4.5 (several racing seasons)
2. mystery motor from who knows who supposed to be a built euro 4.7 lasts 100miles and 20 laps on the track before #2-6 fail.
3. rebuld mystery motor ( just new crank and bearings)of the mystery motor grenades on in the driveway starting up
4. used 4.7 euro block that we re-ringed runs perfect , but need more power and has a head gasket leak from not enough bolt torque. (assembly error) But lasts a season.
5. mystery motor 4.7 euro block, bored out to 5 liter and uses 5 liter pistons. (1 full racing season so far and running strong. posts 1:40.xx at laguna)
01-30-2009, 06:02 PM
#58
Three Wheelin'
I got mine from Canton Racing. www.CantonRacingProducts.com
Their universal windage screen kit is here.
http://www.cantonracingproducts.com/...&category=2090
Their universal windage screen kit is here.
http://www.cantonracingproducts.com/...&category=2090
01-30-2009, 06:58 PM
#60
Rennlist Member
That's all I do on our tracks! thunderhill turn 2, sears carocel, laguna turn 9.
And, we are pulling a heck of a lot more Gs as well!.
Its something else. Its as we discussed on the post mortum thread regarding the difference between WOT, high rpms for intermittant periods vs sustained 5800rpm instances.
mk
And, we are pulling a heck of a lot more Gs as well!.
Its something else. Its as we discussed on the post mortum thread regarding the difference between WOT, high rpms for intermittant periods vs sustained 5800rpm instances.
mk