 Will removing rain tray help cooling? |
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| AZ914 |
 Apr 19 2005, 02:00 PM
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#1
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914 Dumbass  Group: Members Posts: 1,459 Joined: 6-January 03 From: Sunny Tucson Member No.: 98 Region Association: Southwest Region  |
Hey all!
Just wondering if removing the rain tray will give me some additional cooling that might be noticable on the temp gauge. Anyone done this or have any data to support it? Also, the side grills in my car have some sort of plastic covering over the holes underneath (no air passes thru). Not sure if this was standard on the late model cars or not. Thanks! |
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| Dave_Darling |
Apr 19 2005, 02:06 PM
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#2
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Yes, removing the rain tray "should" result in additional cooling. It will likely not be enough to see on a temp gauge.
I've never heard of the side-grill covers, but that doesn't mean they weren't an odd option. --DD |
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| brant |
Apr 19 2005, 02:06 PM
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#3
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914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Yes a little bit.
I don't have any numbers for you, but I had always heard 5 degrees difference or there abouts. brant |
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| nebreitling |
Apr 19 2005, 02:08 PM
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#4
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Member Emeritus Group: Members Posts: 3,314 Joined: 26-March 03 From: San Francisco Member No.: 478 |
yup, i got about 5 degrees. it was noticable on my gauge.
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| mightyohm |
Apr 19 2005, 02:09 PM
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#5
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Advanced Member Group: Benefactors Posts: 2,277 Joined: 16-January 03 From: Seattle, WA Member No.: 162 Region Association: Pacific Northwest  |
I am trying to decide on whether to ditch my rain tray or not for this weekend. What if it rains? (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif)
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| Brett W |
Apr 19 2005, 02:11 PM
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#6
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Advanced Member Group: Members Posts: 2,856 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None
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I agree with Dave. When I put mine back on I saw no detectable change in my gauge readings. You will however notice a huge drop in temps of you remove the engine lid all together.
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| tat2dphreak |
Apr 19 2005, 02:26 PM
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#7
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stoya, stoya, stoya Group: Benefactors Posts: 8,797 Joined: 6-June 03 From: Wylie, TX Member No.: 792 Region Association: Southwest Region |
then you'll have a water-cooled engine, right?! (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif) |
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| Mueller |
Apr 19 2005, 02:31 PM
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#8
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None
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a neighbor with an original /6 had his engine lid rigged so that he could pull on the lever and have it pop open only to about an inch to an inch and a half...claimed he'd get a 15° reduction in engine temp on a hot day.... |
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| 914GT |
Apr 19 2005, 02:33 PM
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#9
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Senior Member Group: Members Posts: 1,100 Joined: 11-October 04 From: Tucson Member No.: 2,923 Region Association: Southwest Region |
Jason, bring it over sometime. Once the engine temp has stabilized (you driving it over to my house) we can measure the temp where the air exits the heads for a minute or so with my digital thermometer, then open the engine lid and see if it goes down any. If it does not go down, or very little, then probably no point in removing the rain tray. My thermometer has a remote pickup and reacts almost instantly to temp. changes.
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| Elliot_Cannon |
Apr 19 2005, 02:40 PM
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#10
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Senior Member Group: Retired Members Posts: 1,922 Joined: 26-March 03 From: Orange County Ca Member No.: 480 Region Association: None |
I think Sklines ten day forcast for rain has a few people worried, (including me). One thing to keep in mind is ten day forecasts aren't worth the paper they are printed on. I removed my rain tray but if it looks like rain on thursday or friday morning I will re-install it or take it to the WCC with me and intall it when needed. My car runs a bit cooler without the tray but the calibration on my cage is hard to tell 5 degrees but I would bet that is pretty close estimate. Cheers, Elliot |
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| grantsfo |
Apr 19 2005, 02:58 PM
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#11
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Arrrrhhhh! Group: Members Posts: 4,327 Joined: 16-March 03 Member No.: 433 Region Association: None |
I removed mine this past week. ...it added at least 5 hp to my car (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
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| Jake Raby |
Apr 19 2005, 03:08 PM
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#12
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The testing of the 914 DTM is almost finished. I only await my new 16 channel data logger to log the results of some various changes so they can be documented.
I plan on testing with and without the rain tray to see the differences and even modifying a rain try to also see the effects. BTW- Those infrared temp gauges are worthless for this type of test work. By the time you stop the car, get out and aim the gun the temps can drop as much as 100 degrees. |
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| AZ914 |
Apr 19 2005, 03:23 PM
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#13
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914 Dumbass Group: Members Posts: 1,459 Joined: 6-January 03 From: Sunny Tucson Member No.: 98 Region Association: Southwest Region |
Thanks for the posts! It won't rain here for another 3 months so maybe I'll try it out, can't hurt. Now only if my air cleaner was chrome!
My car seems to run a bit warm here on the 80+ degree days (at least according to the gauge). A couple of times, I've seen it inch up towards 5/6ths up the gauge on longer drives. That scares me. It is a 75 with the smog crap on it so I'm sure that doesn't help. I'm thinking about going the oil cooler route. Maybe something like Demick's as I do not want to cut my tub. (maybe mount one in the front valance w/no chopping?) Guy.. thanks for the offer. I'm curious as to what my actual temps are. I'll take you up on that. DD.. During the last meet I went to, I think one other person had seen those side grill 'covers'. If you pop the grill off, you can't see down into the engine. There is a molded thin layer of plastic (almost membranish) covering the hole. I figured that they may have done that on the late models to help keep water off the battery. (IMG:http://www.914world.com/bbs2/html/emoticons/huh.gif) |
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| Demick |
Apr 19 2005, 03:37 PM
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#14
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Ernie made me do it! Group: Benefactors Posts: 2,312 Joined: 6-February 03 From: Pleasanton, CA Member No.: 257 |
An infrared temp gun is a great way to find out what your oil temps are (I think Jake is talking about head temps which can change very quickly). Oil temps change pretty slowly. Shoot the sump plate with an infrared gun and get an accurate reading for what your oil temps are. Find out what 5/6's up the gauge really is.
I'll bring my infrared thermometer to WCC if anyone wants to check their temps. Only takes a second. Demick |
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| Rand |
Apr 19 2005, 03:38 PM
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#15
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
FWIW, getting rid of all the smog crap isn't nearly as difficult on a 914 as it is other later model cars. Lose the pump, plug the holes, eliminate the CAT. Might even pick up another 5HP! Especially if you don't need a heater and get some decent headers. I don't know the smog rules in AZ, but my 75 is exempt here in WA. |
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| AZ914 |
Apr 19 2005, 03:47 PM
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#16
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914 Dumbass Group: Members Posts: 1,459 Joined: 6-January 03 From: Sunny Tucson Member No.: 98 Region Association: Southwest Region |
Randy.. thanks for the post. AZ is not bad, but if you live in one of the 2 big metro areas (Phoenix or Tucson), you are subject to smogging. They actually do a physical inspection to ensure you are running with a CAT and air pump. SUCKS....
However, there is a bill on the govenor's desk to exempt 15+ year old collectable type cars.. If that happens, I'm definitely losing smog hardware..! |
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| Rand |
Apr 19 2005, 04:00 PM
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#17
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
Ouch. Guess we're lucky here. Hope they pass that bill!
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| bondo |
Apr 19 2005, 04:18 PM
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#18
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
The reduction in temps from removing the rain tray are hard to measure because they happen slowly. When you first remove the rain tray you may notice little difference.. but in a few years once those extra holes open up, you'll get extra cooling air form the passenger compartment and wheelwells. (IMG:http://www.914world.com/bbs2/html/emoticons/lol2.gif)
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| Jake Raby |
Apr 19 2005, 04:40 PM
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#19
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The reason that I recommend not using the intfrared temp guy is because the surface temp of the case or the sump plate is not the same as the oil temp.
Aluminum conducts heat fast and the case can soak up heat made all throughout the engine. Measuring the surface temp is never as accurate as measuring from a probe on the head or submerged in the oil. While any data beats no data I'd still shy from infrared temp guns as a tuning or comparative tool. Buy gauges- With numbers and live by them. |
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| anthony |
Apr 19 2005, 05:08 PM
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#20
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2270 club Group: Benefactors Posts: 3,107 Joined: 1-February 03 From: SF Bay Area, CA Member No.: 218 |
If your car is running hot then figure out why it's running hot. Leaves blocking the oil cooler? Flaps operating correctly?? If you car is not overheating then leave the rain tray alone. I can drive all day in 100 degree heat and my temperature gauge never goes above the 3/4 mark.
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