2-6 rod failures in "drilled" or stroker cranks?
05-26-2009, 09:19 PM
#46
Rennlist Member
Yes, they drilled the crank like a chevy. Like an insurance policy i imagine. I do get little pressure drops at turn 2 at thunderhill, which the holbert car didnt, but that could be from the drilling. hard to say. The drilling would be better, even with a little less pressure.
Yes, we dynoed it a few times already. 370 at the rear wheels (about) (400rwt peak)
Fuel fat, and all stock components on the engine, (85 US cam)
One knock sensor could be bad and we might change that out soon. (anderson did a dyno of his and he lost 50 hp up top and that might be what is wrong with mine, as most thought it might be closer to 400rwhp.
mk
Yes, we dynoed it a few times already. 370 at the rear wheels (about) (400rwt peak)
Fuel fat, and all stock components on the engine, (85 US cam)
One knock sensor could be bad and we might change that out soon. (anderson did a dyno of his and he lost 50 hp up top and that might be what is wrong with mine, as most thought it might be closer to 400rwhp.
mk
05-26-2009, 10:06 PM
#47
Rennlist Member
Tracking the car aside, would I be right to say:
- Use 20 x 50 synthetic oil
- Periodically check your oil by putting some of it on a piece of black paper and look at it in the sun for metal flakes
- Cut your oil filter open when you change your oil and look for metal in the paper element
- When the OPG’s replaced, have 2-6 inspected
- Immediately park the car when you see suspicious oil pressure loss and don’t drive it ‘til it’s checked out
Am I missing anything? As a soon to be owner of a GTS, you guys are scaring the crap out of me and making me think it’s a ticking time-bomb.
- Use 20 x 50 synthetic oil
- Periodically check your oil by putting some of it on a piece of black paper and look at it in the sun for metal flakes
- Cut your oil filter open when you change your oil and look for metal in the paper element
- When the OPG’s replaced, have 2-6 inspected
- Immediately park the car when you see suspicious oil pressure loss and don’t drive it ‘til it’s checked out
Am I missing anything? As a soon to be owner of a GTS, you guys are scaring the crap out of me and making me think it’s a ticking time-bomb.
05-26-2009, 10:32 PM
#48
Addict
Rennlist Member
Rennlist Member
Join Date: May 2001
Location: Wilbraham, MA
Posts: 2,758
Likes: 0
Received 0 Likes
on
0 Posts
My opinion is that if you aren't going to track it, don't worry about it. At least in my life experience. I haven't seen how/where you could replicate the use/abuse of the track on the street. Of course if it was tracked before you (not too likely with a GTS), then you should have the 2/6 reviewed.
05-26-2009, 11:06 PM
#49
Rennlist Member
My opinion is that if you aren't going to track it, don't worry about it. At least in my life experience. I haven't seen how/where you could replicate the use/abuse of the track on the street. Of course if it was tracked before you (not too likely with a GTS), then you should have the 2/6 reviewed.
Too bad someone dosen't make an oil pan with a clear lexan window. Be neat to see what's going on in there when the oil's drained
05-26-2009, 11:18 PM
#50
Addict
Rennlist Member
Rennlist Member
Join Date: May 2001
Location: Wilbraham, MA
Posts: 2,758
Likes: 0
Received 0 Likes
on
0 Posts
There are fiber optic scopes that would let you "see" in there, but they won't r&r the rod cap to view the bearing
05-26-2009, 11:46 PM
#51
Rennlist Member
Ive had 5 928 engines that I have been responsible for an all have seen extreme track use. High G loading with big slicks. never an issue. Full oil pressure to 5 bar at all temps.
Holbert engine had over 110 race days, all sorts of track conditions over 7 full racing seasons and it looked brand new when pulled apart. so did my 84, so did scots 82, his euro, and his new 5 liter, which is still running, and the 79 had a few races too. New stroker has 15 race days on it and running strong. Oil has been sent off for analysis, and came back with perfect condition test results.
It could be how guys are warming things up, prior damage to the bearings, bad oil, how they are driven, or a dozen other factors. Bottomline, I wouldnt worry about it. It there was a MAJOR flaw, dont you think I would have seen it by now?
mk
Holbert engine had over 110 race days, all sorts of track conditions over 7 full racing seasons and it looked brand new when pulled apart. so did my 84, so did scots 82, his euro, and his new 5 liter, which is still running, and the 79 had a few races too. New stroker has 15 race days on it and running strong. Oil has been sent off for analysis, and came back with perfect condition test results.
It could be how guys are warming things up, prior damage to the bearings, bad oil, how they are driven, or a dozen other factors. Bottomline, I wouldnt worry about it. It there was a MAJOR flaw, dont you think I would have seen it by now?
mk
Tracking the car aside, would I be right to say:
- Use 20 x 50 synthetic oil
- Periodically check your oil by putting some of it on a piece of black paper and look at it in the sun for metal flakes
- Cut your oil filter open when you change your oil and look for metal in the paper element
- When the OPG’s replaced, have 2-6 inspected
- Immediately park the car when you see suspicious oil pressure loss and don’t drive it ‘til it’s checked out
Am I missing anything? As a soon to be owner of a GTS, you guys are scaring the crap out of me and making me think it’s a ticking time-bomb.
- Use 20 x 50 synthetic oil
- Periodically check your oil by putting some of it on a piece of black paper and look at it in the sun for metal flakes
- Cut your oil filter open when you change your oil and look for metal in the paper element
- When the OPG’s replaced, have 2-6 inspected
- Immediately park the car when you see suspicious oil pressure loss and don’t drive it ‘til it’s checked out
Am I missing anything? As a soon to be owner of a GTS, you guys are scaring the crap out of me and making me think it’s a ticking time-bomb.
05-26-2009, 11:58 PM
#52
Rennlist Member
Thanks again and sorry for the temporary off-topic diversion. I'll shut up now...
05-27-2009, 12:02 AM
#53
Race Director
Thread Starter
Ive had 5 928 engines that I have been responsible for an all have seen extreme track use. High G loading with big slicks. never an issue. Full oil pressure to 5 bar at all temps.
Holbert engine had over 110 race days, all sorts of track conditions over 7 full racing seasons and it looked brand new when pulled apart. so did my 84, so did scots 82, his euro, and his new 5 liter, which is still running, and the 79 had a few races too. New stroker has 15 race days on it and running strong. Oil has been sent off for analysis, and came back with perfect condition test results.
It could be how guys are warming things up, prior damage to the bearings, bad oil, how they are driven, or a dozen other factors. Bottomline, I wouldnt worry about it. It there was a MAJOR flaw, dont you think I would have seen it by now?
mk
Holbert engine had over 110 race days, all sorts of track conditions over 7 full racing seasons and it looked brand new when pulled apart. so did my 84, so did scots 82, his euro, and his new 5 liter, which is still running, and the 79 had a few races too. New stroker has 15 race days on it and running strong. Oil has been sent off for analysis, and came back with perfect condition test results.
It could be how guys are warming things up, prior damage to the bearings, bad oil, how they are driven, or a dozen other factors. Bottomline, I wouldnt worry about it. It there was a MAJOR flaw, dont you think I would have seen it by now?
mk
Careful...you might anger the rod bearings gods....I think a sacrifice to the 928 shrine is in order!
If you look at all of the 928's that drive regularly on the track.....other than yourself and Scot....every single one has some type of rod bearing issue or extra system installed to deal with it.....so you must admit you are the "lucky" one....
