The Bus

My C4 race car is toast [ caught on fire ]. I just bought a 2007 C6 with Z51 package. I'm 73 [ almost ] and I thought instead of buying another race car I'd do HPDEs for my race/speed fix. I'll be running 315 30 18 A6s all the way around. I thought I read somewhere that LS 6s have a oiling problem on hard cornering. True or false??? If so will a extra quart of oil be enough for HPDEs or what can I do? Or not run the car???
Or should I run something with less grip. Street tires or maybe Toyo 888s ??????
All info is welcome.

The Bus

Didn't mean LS6 but LS3. Sorry

RX-Ben

LS3 was introduced in 2008, which means an '07 with have an LS2. I think a few people have built LS2s that have been surviving on A6s and an Accusump, but I'll let them chime in.

rocsvette

It was the LS7 that had oiling issues on hard cornering with R Comp tires. In 2008 they increased the size of the dry sump tank from 8 to 10 quarts. The LS2 (2005-2007) should be fine with half quart over. I run an LS7 with the larger tank so I would want to see what those with an LS2 say just to confirm.

J.R.

I agree with RX-Ben. But it depends. If you run A6's you will have the potential for a lot of grip. If you run a track with left hand sweepers that will tend to exacerbate the oiling issue. If you are moving from an all out race car to an HPDE car you are probably pretty aggressive on cornering so that will compound the oiling issue. Also rpm. If you shift at 6600-6800 rather than 6000-6200 that will also tend to increase oiling issues.

Solutions (from least costly to more costly):
Overfill by 1/2 to 1 qt.
Use restricted pushrods (Smith Bros. or Trend) - this will somewhat limit oil pooling in heads and not draining back to oil pan for pickup.
Install an Accusump

To be as safe as you can without installing a dry sump do all of the above.

0Anthony @ LGMotorsports

save for the restrictor pushrods. Not a fan of doing that unless it is the last resort.

For most the over fill by 1 qt seems to take care of the job, and an Accusump will most certainly take care of it.

The Bus

thanks for all the info

J.R.

Anthony,

Have you seen any issues with restrictor pushrods?

I have been using them for the past 6 seasons and have not seen any valve train issues etc. with 80-100hrs on rebuilds. This is obviously just race engines.

Thanks,

J.R.

0Anthony @ LGMotorsports

We always forced oil up there through spray bars in the valve covers to keep the springs cool. Without that, personally I wouldn't want to restrict oil up there if I didn't have to.