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| porsche735 |
Sep 15 2003, 11:08 AM
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#1
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Member ![]() ![]() Group: Members Posts: 189 Joined: 10-January 03 From: Los Altos, CA Member No.: 127 |
So, we have been running a rear cooler hanging down near the aft of the transmission. It has been doing an OK job of keeping us cool. This weekend we ran at Laguna Seca (where it was supposed to be 74 degrees, but was actually 87) at a charity event. I was taking 3 people out for 3 laps each (about 20 minutes) and then would come in when the temp reached 250. Interestingly, we found that shutting down the engine cooled it off faster than letting it idle (I thought the fan was supposed to cool these things). On Sunday, the temperature was more like 78 degrees. The engine temp, even with 6 people on 3 lap runs each (about 45 minutes) only got the car up to 240 degrees.
As we are still breaking in the engine it makes sense that the temps would come down as teh cylinders have less friction once teh rings are worked in. We are also running regular dino oil, so synthetic should bring down the temp as well (10 degrees or so). However, even though it looks like we will be able to keep our temps at around 230-240, we have to deal with Buttowillow and Thunderhill at 100 degree temps. I think it is time for a front cooler. So, I know Brad has spoken about some types that he uses that keep the cars at 190 degrees (which sounds to low to me BTW). What brand are these and where is the best/cheapest place to get them? Also, what is teh best place to get teh AN fittings and oil hose? Do you think that steel braided is a requirement or just looks nice? Thanks for the feedback... Chris |
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| brant |
Sep 16 2003, 12:47 PM
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#2
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914 Wizard ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 12,092 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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Chris,
Its kind of a gamble that you have to decide on your own. I did it on recommendation of my builder.. I did it not to save money, but rather to improve cooling and ultimately performance. I had a thermo installed in the begginging... it was the mocal plate, and I think that is fine. On my 4 cylinder I had a back up plan. I installed an pressure release valve in an accusump. ONCE, on a very cold morning "frosty and wet" I did blow the valve. dumped a couple of quarts in the trunk floor in the pits. Did not blow the cooler apart. The purpose of the thermostat is twofold: first to save your cooler from too much pressure second to reduce wear on your engine - cold start/poor lubrication wear. you can go with a safety valve if you want. You can monitor the ambient temp (ie: don't start the motor if you feel it is too cold for the oil to provide good lubrication) and monitor the pressure. When I cold start I won't rev- the motor to the point of bring the pressure too high. If this means driving around the pits for 20 minutes and missing a session, then I make that decision. Our summer temps are 80 degrees in the morning and 110 through out the day. We barely ever see 50's or 60's. Also, I theorize that we loose a little cooling efficiency at altitude due to the air being less dense. The mocal type uses a little space but is still very doable. Re-route the clutch cable slighly and it will work fine. good luck either way. |
porsche735 Oil cooler front install Sep 15 2003, 11:08 AM
J P Stein Summit Racing or Racers Warehouse (Wholesale?) for... Sep 15 2003, 11:24 AM
nomore4 Here's a couple places for oil lines/coolers:
... Sep 15 2003, 11:29 AM
porsche735 Do you really need a thermostat for a racing appli... Sep 15 2003, 11:51 AM
seanery think of a cold, november morning at Laguna. You N... Sep 15 2003, 11:53 AM
drew365
J P Stein The feed line "should" be AN 16.......the stock li... Sep 15 2003, 02:54 PM
brant I haven't said anything controversial all week... Sep 15 2003, 05:14 PM
porsche735 Brant,
Given our California weather and the fact t... Sep 15 2003, 05:48 PM
campbellcj I'm not sure I have the cajones to run w/o a t... Sep 15 2003, 10:58 PM
porsche735 What are your thoughts about the sandwich-type the... Sep 16 2003, 10:04 AM
campbellcj My last car (2.0 four) had the sandwich plate type... Sep 16 2003, 10:22 AM
john rogers We have never had a thermostat in the race car sin... Sep 16 2003, 10:25 AM
porsche735 John,
Where did you get your cooler and who was it... Sep 16 2003, 01:51 PM
J P Stein John:
I was talkin' to a race car guy (interne... Sep 17 2003, 02:57 AM![]() ![]() |
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