Camaro XV - Lateral-g Forums

Steve68 · #1 01-04-2013, 04:39 AM

Mark,

whats the difference in oil cooler sizes between the Mule and Mayhem vs XV, is it a difference in line size or cooler size, thanks

**Stielow** · #2 01-04-2013, 07:35 AM

Quote:

Originally Posted by Steve68

Mark,

whats the difference in oil cooler sizes between the Mule and Mayhem vs XV, is it a difference in line size or cooler size, thanks

The Mule had a oil to water oil cooler built into the end tank of a Griffin rad. It held the oil temp down to under 250F for 3-5 laps. The turbos drive a lot of heat into the oil. One issue I have found is some of the older gauges don’t read high enough for synthetic oils. Redline has told me there engine oils are good to 325F. The Mule gauge pegged at 250F so we were shutting off early. Jackass has a relatively stock LS9 in it and it has no cooling issues on track with its Ron Davis rad with an oil to water oil cooler built into it. Red Devil runs a stock LS9 oil to water oil cooler mounted to the side of the engine. Once we had that car fully tuned up it would over temp the oil and the water in 5 laps on a 90 degree day. On Mayhem I upped the rad and moved the trans and diff coolers to the back of the car. In a 5 lap session the water temp was great and the oil temp is getting marginal. That oil cooler is built into the rad as a oil to water cooler.

On Camaro XV we upper the rad size even more with a custom core from Dewitt. I met with C&R rad at SEMA and they steered me to a larger 13 plate oil to water oil cooler that should keep my oil temp good. I have opened up the front of the car with the new Anvil front clip. I’m using my vented hood again to help move air through the rad. Dewitt is also making me a one off intercooler heat exchanger that will nest into the cooling stack to maximize core face and air flow. On Red Devil, Mayhem and Camaro XV I’ve ran a very large powerful cooling fan. It is a 20 inch dia Caddy SRX Turbo fan what pulls 850W. I like oil to water coolers because it heat the oil then cools the oil. It also makes a very clean installation. Dewitt is finishing the cooling stack next week and I hope to have some photos to post.

On a side note the LS9 based engines have oil squirters that shoot oil on the bottom of the piston to cool the pistons. Thomson modifies the LS7 block to add the piston squirters. He did a lot of testing to sort out the size and the location of these squirters. This does drive oil temp. Also as the power goes up so do the heat rejection requirements.

On your question on oil line sizes. I’ve been running -10 AN for cooling lines. I have run 12 AN but the 10 AN seems fine. I don’t have the sizes of all of the different coolers, sometimes it is hard to get the heat rejection rates or to know what you need without just testing it.

Hope that helps

Mark

Gandalf · #3 01-04-2013, 07:52 AM

Hey Mark, et all; thanks for the awesome detailed info on topics that inevitably come up for many of us both during and after an initial build. It's great to have good, experienced, first-hand, engineering-driven info like this. I really hope you have time to capture some of this for your next book :-)

G.

ironworks · #4 01-04-2013, 07:52 AM

It is amazing how much more complicated this get with every extra horsepower. All the heat you have to deal with is amazing.

When I helped out on a Turbo drag car that was running high 6 second passes. We would put 40 lbs of ice in an aluminum 20 gallon fuel cell and water to air intercooler and in one 1/4 mile pass you would have luke warm bath water. 4 10lbs bags of ice in a quarter mile.

That just goes to show how much work building a big Hp road race car is and why most big race teams don't run huge power.

Thanks for the insight Mark, I feel like I can go home for the day after I learned something.

**parsonsj** · #5 01-04-2013, 07:57 AM

Quote:

Originally Posted by Mark

I have less data on the trans but while I'm at it I add one. If someone is not going 10/10ths then the extra cooler are not needed.

I overheat the transmission in my Z06 in about 15 minutes (Sebring, Homestead). It's the current limiting factor on my car on track days. Packaging the coolers are hard to do, but they are absolutely required.

preston · #6 01-04-2013, 02:24 PM

When you quote your oil temps where are you measuring it - before or after it enters the engine ?

Are you water/oil coolers plumbed to the cold or hot side of the radiator ?

What is your airflow path for the rear mounted coolers ? I have mounted them in the tail panel before that seems like a low pressure area but I have heard you can actually get reversed air flow in there if you have a somewhat "open" trunk like I do. Where do you pick up your intake air for rear mounted coolers ?

**Stielow** · #7 01-05-2013, 06:06 PM

I finally got the Anvil parts.

The fenders, inner fender wells, front valance, and hood saves approx. 125 lbs.

I can also fit a 11 inch wide front wheel!

Nice well made parts that fit well.

Mark