GM knows how to make it work, obviously. The Le Mans Corvettes are taking far more abuse than trackway cars.
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Nov. 19, 2011 1:43 p.m. Keith SuperDork
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Nov. 19, 2011 2:02 p.m. The_Jed Reader
So should I put some baffles in the Burban's (LM7) oil pan?
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Nov. 19, 2011 3:54 p.m. Greg Voth HalfDork
docwyte wrote:
Campaigned my LS1 equipped 951 all season with no issues. 4 30 minute sessions a day, 6+ weekends...
I hear about 5.0's blowing up as well but our car has lasted two lemons endurance races 24 and 14 hours respectively (probably about 30 hours of time on track) without issue. Just keeping it 1 quart of oil above full.
I think it depends on how many G's the car is pulling, what track and turn they are on etc. I am putting an LS1 in my 1st gen RX-7 and doubt I'll be pulling the G's these Corvette guys on slicks do. 315+ width tires generate alot of grip.
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Nov. 21, 2011 9:31 a.m. camaroz1985 Reader
We are adding an extra qt to our 5.0 for the next Lemons race. We noticed the pressure dropping in corners this past one.
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Nov. 21, 2011 9:32 a.m. carguy123 SuperDork
Keith wrote:
GM knows how to make it work, obviously. The Le Mans Corvettes are taking far more abuse than trackway cars.
So GM is running LS2s or 3s?
The problem is supposed to have been fixed in other versions.
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Nov. 21, 2011 9:51 a.m. Keith SuperDork
The Le Mans Corvettes run the LS7.R. You can probably guess what it's most closely related to. And like the street LS7, it's dry sumped. Possibly with a bigger tank or more scavenge stages, I don't know.
It's a Gen IV engine, just like the LS2 and LS3. The LS1 and LS6 are Gen III - I mistakenly referred to these as 4 and 5 in an earlier post. I don't know if the generational change is significant, but it does seem like more than a coincidink. Remember that the LS3 is the current production engine while the LS2 has been replaced, so anything that was "fixed" in the LS2 should also have carried through to the LS3.
After having a bit more time to go through the entire thread, it appears that it's only the serious racers that are having trouble. Sustained 1.2g or more on a left turn. That should give some big clues as to exactly what's going on.
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Nov. 21, 2011 11:58 a.m. bluej Dork
I don't have anything constructive to add other that someone needs to TM "LSJohn" and sell them with the grills and margherita makers.
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Nov. 21, 2011 12:48 p.m. turboswede SuperDork
Not sure what's running in this:
https://www.facebook.com/video/video.php?v=2052598753300
http://www.youtube.com/watch?v=HPHmOIjjlwI
but it appears to have had an unknown issue and blown up:
http://forums.corvetteforum.com/garage/2005-Chevrolet-Corvette-4051-OCCOMSRAZOR.html
http://forums.corvetteforum.com/c6-tech-performance/2944036-need-opinions-on-new-r...
So its an LS2 from the above specs. Still, those vettes can generate a ton of lateral G's.
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Nov. 23, 2011 7:57 a.m. Varkwso HalfDork
The problem is pretty much limited to the LS3. The LS1/2/6 are ok with the batwing pan LS6 being the most reliable (and no longer available in a crate). The LS3 Grand Sport Coupe comes with dry sump. Those run 335s by the way.
Early LS7s also tend to detonate in an impressive manner and they are all dry sumped. The 08 and later dry sumps are better.
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Nov. 23, 2011 5:20 p.m. Canute New Reader
Thanks for that information. I knew I wanted a C5 Z06 for some reason.
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Nov. 23, 2011 5:48 p.m. fasted58 SuperDork
2010 Chevy Corvette Grand Sport LS3 dry sump lubrication system explained
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Nov. 23, 2011 5:55 p.m. Javelin SuperDork
docwyte wrote:
Campaigned my LS1 equipped 951 all season with no issues. 4 30 minute sessions a day, 6+ weekends...
As I understand the issue, which isn't well, it's a drainback issue with the Gen IV square-port engines (LS2, LS3) that wasn't an issue with the cathedral-port Gen III (LS1, LS6). I could be totally wrong though as there's a distinct lack of LSx anywhere on my property...
