 Rear valance and engine heat, Does it trap it? |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| MoveQik |
 Nov 9 2006, 09:55 AM
Post
#1
|
|
What size wheels can I fit?  Group: Members Posts: 4,645 Joined: 5-April 05 From: Scottsdale, AZ Member No.: 3,881 Region Association: Southwest Region   |
I recently bought a fiberglass rear valance. It is the larger /6 style. Shortly after I bought it, it was brought to my attention that this has been rumored to trap warm air around the engine. In theory this seems logical....any truth to this in reality? More heat is the last thisg that I need here in AZ.
|
   |
 
|
| brant |
Nov 9 2006, 09:58 AM
Post
#2
|
|
914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
|
yes..
|
|
|
|
| Air_Cooled_Nut |
Nov 9 2006, 10:04 AM
Post
#3
|
|
914 Ronin - 914 owner who lost his 914club.com Group: Members Posts: 1,748 Joined: 19-April 03 From: Beaverton, Oregon Member No.: 584 Region Association: None |
No.
|
|
|
|
| Ferg |
Nov 9 2006, 10:18 AM
Post
#4
|
|
914 Guru Group: Members Posts: 5,948 Joined: 8-January 03 From: Boulder CO Member No.: 116 Region Association: None
|
|
|
|
|
| john rogers |
Nov 9 2006, 10:19 AM
Post
#5
|
|
Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
Yes and No. Yes if you do not have one of the large stock type mufflers that would sit in front of it such as a race car with stingers and No if you have the muffler.
|
|
|
|
| MoveQik |
Nov 9 2006, 10:42 AM
Post
#6
|
|
What size wheels can I fit? Group: Members Posts: 4,645 Joined: 5-April 05 From: Scottsdale, AZ Member No.: 3,881 Region Association: Southwest Region |
QUOTE(Ferg @ Nov 9 2006, 09:18 AM)  (IMG:style_emoticons/default/slap.gif) Fantastic....you guys are great. I assume that Brant is serious but I'm not sure about the "no" answer. In all seriousness, I currently have an aftermarket 911 muffler(see my avatar) on it that has been rumored to be on the large side. How about if I "slotted" the valance and glassed in some mesh behind the slots? (IMG:style_emoticons/default/confused24.gif) You think that would get the air out? |
|
|
|
| So.Cal.914 |
Nov 9 2006, 10:54 AM
Post
#7
|
|
"...And it has a front trunk too." Group: Members Posts: 6,588 Joined: 15-February 04 From: Low Desert, CA./ Hills of N.J. Member No.: 1,658 Region Association: None |
QUOTE(MW 914 @ Nov 9 2006, 08:42 AM) QUOTE(Ferg @ Nov 9 2006, 09:18 AM) (IMG:style_emoticons/default/slap.gif) Fantastic....you guys are great. I assume that Brant is serious but I'm not sure about the "no" answer. In all seriousness, I currently have an aftermarket 911 muffler(see my avatar) on it that has been rumored to be on the large side. How about if I "slotted" the valance and glassed in some mesh behind the slots? (IMG:style_emoticons/default/confused24.gif) You think that would get the air out? I am sure it would help alot but with that big muffler in the way it probably deflects alot of air. |
|
|
|
| Aaron Cox |
Nov 9 2006, 11:31 AM
Post
#8
|
|
Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
you probably wont notice any adverse effects...
|
|
|
|
| TROJANMAN |
Nov 9 2006, 11:39 AM
Post
#9
|
|
Looks nice in pictures......... Group: Members Posts: 5,271 Joined: 5-March 04 From: Colorado Member No.: 1,753 Region Association: None |
mike,
just buy a bigger radiator oh....and all of that extra heat is probably what's making your brakes squeek |
|
|
|
| MoveQik |
Nov 9 2006, 11:42 AM
Post
#10
|
|
What size wheels can I fit? Group: Members Posts: 4,645 Joined: 5-April 05 From: Scottsdale, AZ Member No.: 3,881 Region Association: Southwest Region |
QUOTE(TROJANMAN @ Nov 9 2006, 10:39 AM) mike, just buy a bigger radiator oh....and all of that extra heat is probably what's making your brakes squeek (IMG:style_emoticons/default/laugh.gif) Note to self - Ignore all users from Colorado. |
|
|
|
| john rogers |
Nov 9 2006, 11:43 AM
Post
#11
|
|
Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
In thinking about it more, it must NOT trap the heat as it certinly does not trap oil when you blow and engine wide open at speed. When mine went at about 120 or so all the oil went into the 356 right behind me!
|
|
|
|
| LvSteveH |
Nov 9 2006, 11:44 AM
Post
#12
|
|
I put the Poor in Porsche Group: Members Posts: 1,080 Joined: 22-April 03 From: Las Vegas, Nevada Member No.: 600 |
On your car, the muffler provides enough ram-jet effect to easily negate any issues with the rear valance (Have ya seen the size of his exhaust tips??)
Your best bet is to try it out and see. It will be interesting to see how it works with your oil cooler location. It only takes 5 minutes to take it back off if you need to. |
|
|
|
| MoveQik |
Nov 9 2006, 11:46 AM
Post
#13
|
|
What size wheels can I fit? Group: Members Posts: 4,645 Joined: 5-April 05 From: Scottsdale, AZ Member No.: 3,881 Region Association: Southwest Region |
QUOTE(LvSteveH @ Nov 9 2006, 10:44 AM) Your best bet is to try it out and see. It will be interesting to see how it works with your oil cooler location. It only takes 5 minutes to take it back off if you need to. Thing is...I can sell it now if I want to. After I cut it for my exhaust it won't be worth much to any one else. |
|
|
|
| brant |
Nov 9 2006, 11:54 AM
Post
#14
|
|
914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
|
Mike,
sorry for the differences of opinions. someone here must have the old link. once upon a time there was an old thread or link of a 914 guy who did ton's of actual temperature measurements. was it brad anderson?.... can't remember but in the old testing that was done, there was an actual test that showed removing the rear valance dropped engine bay or was it oil temperatures. this was tested on a -4cylinder... but should yield similar results on a -6 my experience is only racing, but I've ALWAYS been told and understood that for a track car you should drop the rear valance no matter which muffler you used. even if you have a large sausage style muffler, you can reduce the insulation to it by dropping the valance. I don't think we are talking about a big difference. I think that for a street car the aesthetics might outweigh the benefit. but it is my belief that it will help lower temperatures some. so as mentioned above, try running it both ways (off/on) and see if it helps you brant |
|
|
|
| Howard |
Nov 9 2006, 11:57 AM
Post
#15
|
|
Incontin(g)ent Member Group: Benefactors Posts: 5,785 Joined: 24-July 03 From: Westlake Village, CA Member No.: 943 Region Association: None 
|
QUOTE(Aaron Cox @ Nov 9 2006, 09:31 AM) you probably wont notice any adverse effects... (IMG:style_emoticons/default/agree.gif) And that heat is 'all the way back' so unlikely to affect performance or passenger comfort. Having said that, I just cut a nice piece of insulation for my trunk. Got pretty warm (but not enough to melt the kids' crayons) back there on trek to RRC. Attached image(s) 
|
|
|
|
| jsteele22 |
Nov 9 2006, 12:48 PM
Post
#16
|
|
Senior Member Group: Members Posts: 727 Joined: 24-August 05 From: Colorado Springs, CO Member No.: 4,653 |
QUOTE(Howard @ Nov 9 2006, 10:57 AM) QUOTE(Aaron Cox @ Nov 9 2006, 09:31 AM) you probably wont notice any adverse effects... (IMG:style_emoticons/default/agree.gif) And that heat is 'all the way back' so unlikely to affect performance or passenger comfort. Having said that, I just cut a nice piece of insulation for my trunk. Got pretty warm (but not enough to melt the kids' crayons) back there on trek to RRC. I think the thinking is that as air passes from the region under the engine, then past the tranny, it suddenly hits a wall at the rear of the car, a wall that drops just about straight down from the trunk floor level, down to the lower bumper level, and then a few more inches if you have a valence. So from the paint of view of air flow, its a major restriction. I've been working on my engine bay from the inside (just crawl under and sit on the gound) and I was thinking just the other day, that from that perspective the rear end of the car looks like a drag chute. Anyway, based on this I would be willing to bet that removing the valence gives some inprovement, but I have no clue how much. WARNING : Some of the opinions expressed in this post originated in the state of Colorado. They may not be suitable for consumption by pesons living in other areasa. Please consult a qualified non-Colorado resident before taking this advice at face value. May contain nuts. |
|
|
|
| brant |
Nov 9 2006, 12:59 PM
Post
#17
|
|
914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
|
exactly Jeff!
and in a snow state like colorado, you will find many of the old cars have valances bent outward where they have drug in deep snow. the valance (in order to hide everything for aesthetics) is the lowest hanging item usually. |
|
|
|
| VegasRacer |
Nov 9 2006, 01:11 PM
Post
#18
|
|
ELVIRA Group: Benefactors Posts: 8,509 Joined: 27-March 03 From: Between Scylla and Charybdis Member No.: 481 Region Association: None
|
Elvira has a deep rear valance and I have never had any problems with heat.
*(I also know not to keep my Crayons in the rear trunk) |
|
|
|
| McMark |
Nov 9 2006, 01:21 PM
Post
#19
|
|
914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Attached image(s)  
|
|
|
|
| anthony |
Nov 9 2006, 01:42 PM
Post
#20
|
|
2270 club Group: Benefactors Posts: 3,107 Joined: 1-February 03 From: SF Bay Area, CA Member No.: 218 |
So what is the goal here? If you have a 3.2L six then I assume you have a front oil cooler and no cooling issues. Correct?
It sounds like you have plenty of power so trying to improve airflow under the car isn't going to help that much. Unless this is a race car I'd keep the valence because it looks so much better. |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 17th May 2024 - 09:42 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.