Running Really Hot on the Track, I don't necessarily mean fast Options

[ww914]

Yesterday at Buttonwillow for our DE, the temperature was not all that hot, but I could only get in 2 laps at race speed before my CHT gauge started hollering at me. Here are the maximum values from yesterday:
Cyl #1 384 degrees
Cyl #2 357 degrees
Cyl #3 433 degrees
Cyl #4 402 degrees

I have the alarm set at 400 degrees, so each time it reached that temp, I backed off and let it cool down and finished each session with just a Sunday drive. Here's what I have:
My engine is a 2270 built by Original Customs
2 40 DLRAs:
150 main jets
180 air correction jets
34 venturis
9164.2 emulsion tubes
75 idle jets
50 pump jets

Both carbs are accurately sync'd and the a/f gauge shows between 13 - 14 all through the progression to WOT
The timing is set to about 30 degrees

I am running a stock cooling system with the thermostat and flaps working properly. I pulled engine tin to look for obstructions. None.

I am running a Sebtrab 8 x 10 oil cooler but my temps are over 220 when pushing it hard. No fans.

I am not sure where to go from here: alternate cooling, larger oil cooler, fans? Any suggestions would be appreciated.

[Racer]

I am confused about a few things here..

1) I was under the impression that the top side of the 914 engine lid was in a low pressure area. That in fact, the bulk of the cooling air came from the bottom side. Perhaps this moreso in a street car with the rain guard in place. This leads me to really wonder:

a) the oil breather catch tank placement should not really impact engine cooling at all and

b) if the top side is a low pressure area, why the orange hose from the cooler up thru the engine compartment?

2) Have you been able to confirm that the oilcooler is actually working? Can you get a line temp, inlet and outlet sides of the cooler to know if there is a temp difference?

Don't know the class rules you are contsrained by, but I noticed significant oil cooling advantages moving my oil cooler from under the engine lid cover to a front mounted unit that actually got airflow.


CHT temps.. maybe a piece of black tape on the guage would help (IMG:style_emoticons/default/wink.gif)

[brant]

I am confused about a few things here..

1) I was under the impression that the top side of the 914 engine lid was in a low pressure area. That in fact, the bulk of the cooling air came from the bottom side. Perhaps this moreso in a street car with the rain guard in place. This leads me to really wonder:

Nope

a) the oil breather catch tank placement should not really impact engine cooling at all and

Nope....

the stock cooling air comes in through the engine grill
is separated from the bottom side by the tin work and rubbers
is sucked into the stock fan, to be blown over the cylinders and then exits out the bottom of the cylinder fins

thus the oil catch tank anywhere near the intake air path for the fan is a barrier to more air getting in. The distance between the firewall and the fan housing is only about 5 or 6 inches and not any too large to start with

I've always mounted my oil catch tanks on the rear of the engine bay (under the last inches of the rear trunk lid)

the problem with a cooler in place of the rain tray or under the engine lid, is that you are pre heating your intake charge, and also pre heating your cylinder cooling air...

I have seen one fabulous idea using a cooler 25 years ago... with long enough hoses that it mounted on the engine lid for street, and then relocated for track use to a mount using the targa-bar ski rack mounting holes... similar to the go pro mount someone made a month ago.

that car had absolutely clean air hitting a very small cooler with short lines.
it was a great idea and then relocated back to the grill for street use

really surprised no one has copied it yet
a perfect lemons idea
I've bragged about it for ever....

[ww914]

Brant said:
the stock cooling air comes in through the engine grill
is separated from the bottom side by the tin work and rubbers
is sucked into the stock fan, to be blown over the cylinders and then exits out the bottom of the cylinder fins

thus the oil catch tank anywhere near the intake air path for the fan is a barrier to more air getting in. The distance between the firewall and the fan housing is only about 5 or 6 inches and not any too large to start with

I've always mounted my oil catch tanks on the rear of the engine bay (under the last inches of the rear trunk lid)

the problem with a cooler in place of the rain tray or under the engine lid, is that you are pre heating your intake charge, and also pre heating your cylinder cooling air...

I have seen one fabulous idea using a cooler 25 years ago... with long enough hoses that it mounted on the engine lid for street, and then relocated for track use to a mount using the targa-bar ski rack mounting holes... similar to the go pro mount someone made a month ago.

that car had absolutely clean air hitting a very small cooler with short lines.
it was a great idea and then relocated back to the grill for street use

really surprised no one has copied it yet
a perfect lemons idea
I've bragged about it for ever....


Brant

OK, I moved the can away from the firewall, but maybe I will rework the bracket and move it even further back.

I am intrigued with your idea about a temporary track air scoop of some kind that could feed my auxiliary through the engine compartment hose while on the track. I will fiddle with this a bit and report back. Dam, I thought I was done for awhile, but then I guess we're never done with these cars.

[brant]

OK, I moved the can away from the firewall, but maybe I will rework the bracket and move it even further back.

I am intrigued with your idea about a temporary track air scoop of some kind that could feed my auxiliary through the engine compartment hose while on the track. I will fiddle with this a bit and report back. Dam, I thought I was done for awhile, but then I guess we're never done with these cars.

your venting box, is probably good.
I doubt there is a lot to be gained
any tube (drier duct tubing) taped to the outside targa bar should bring cooler air into your cooler. at least a couple of degree's

we are now running a scoop at the back of the window well opening and picked up a lot more cool air for our trans cooler and a noticeable difference on its gauge:

here