my exhaust is HOT!, did i go too far??? |
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my exhaust is HOT!, did i go too far??? |
nebreitling |
Apr 12 2005, 04:16 PM
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#1
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Member Emeritus Group: Members Posts: 3,314 Joined: 26-March 03 From: San Francisco Member No.: 478 |
this is the new 2056 w/ 44 idfs, 9.6:1 comp, euro race header
problem: exhaust pipes and cylinder heads *seem* too hot, particularly on the passenger's side. oil is not too hot. i don't have a pyrometer. i'm using my old '75 2.0 distributor w/ the vacuum advance disabled -- it has like 8 or 10 degrees of mech advance. can't afford a mallory right now. timed to 27 degrees, but the engine seems to want a little less advance when idling around 1800 (still setting up the carbs) (any one have a 205aa or an 050 to sell?) still working the carbs out, but they're not *bad*. if anything, a bit rich. have all engine tin EXCEPT the driver's side cooling flap. the passenger's side flap is expoxied DOWN, such that air is forced through the oil cooler. I've seen numerous carbed cars with this set up. i took the muffler off and the exhaust blows SIGNIFICANTLY stronger through just the 4-1 collecter. this seemed to cool the pipes off a bit, but it still seems a little hot. compressed air flows through the muffler okay, so i reattached it (don't believe it is plugged up). i know i'm pissing in the dark here, but any suggestions that you guys could offer would be apreciatted. (IMG:http://www.914world.com/bbs2/html/emoticons/beerchug.gif) n p.s. the good news is,,,, i DROVE it. still needs more tuning,,, but WOW! it pulls. |
Demick |
Apr 12 2005, 04:38 PM
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#2
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Ernie made me do it! Group: Benefactors Posts: 2,312 Joined: 6-February 03 From: Pleasanton, CA Member No.: 257 |
I'm just wondering what makes you think they are too hot? Exhaust and heads should be much too hot to touch. So if you don't have a way of measuring how hot, what makes you think they are too hot?
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Aaron Cox |
Apr 12 2005, 04:44 PM
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#3
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
have a wide band 02 you can borrow?
are you lean? too much advance? (pinging under load) im pissin in the dark with you.... (IMG:http://www.914world.com/bbs2/html/emoticons/dry.gif) |
nebreitling |
Apr 12 2005, 04:48 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 |
good point -- they're putting off a fair bit more heat than my old engine did. that's my only baseline here. don't have an O2 gauge. want to buy an LM1, need to hold off until the finances recover. tuning by the seat of the pant for now. |
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Aaron Cox |
Apr 12 2005, 04:49 PM
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#5
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
i would love to buy one of those quad EGT / CHT's from westach.... (IMG:http://www.914world.com/bbs2/html/emoticons/wub.gif)
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SLITS |
Apr 12 2005, 05:29 PM
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#6
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
Exhaust temp on a good engine is 1400 (rich) - 1600 (lean) degrees.
Since a gasoline engine is, in reality, a heat engine and you have pumped it up, you will produce more heat...period. Much of the heat is lost down the exhaust system. Expect it to run hotter while sitting idle...once you are moving, the surrounding flowing air will cool them a bit. Since you are at the "center of learning", go to the Engineering Dept and see if they have some heat stickers that read in a range of 250 - 400 degrees. Stick 'em' on and see how hot they are running. TMR, above 350 is not really good. And A-aron Admins, go to your local airplane parts supplier, they'll have EGTs all over the place. Chino Airport and in Ontario are located two aircraft surplus suppliers (or at least they were). |
Mueller |
Apr 12 2005, 05:33 PM
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#7
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914 Freak! Group: Members Posts: 17,150 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
can you drive the car to Napa or Antioch?? Our LM-1 (James, McMark and mine) is currently up in Napa, Mark might drive it down to Antioch this week(end) I know nothing about carbs (plenty in theroy, no real world experiance), so maybe Mark can help??? |
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Trekkor |
Apr 12 2005, 05:46 PM
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#8
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
1800 rpms is too high to set your idle mixture.
You should have the linkage disconnected and running at 900-1000rpm. Are you using a sync tool? KT p.s. Mark's not a carb guy either...Said something about hating carbs. At least everytime I see him (IMG:http://www.914world.com/bbs2/html/emoticons/cool_shades.gif) |
nebreitling |
Apr 12 2005, 05:57 PM
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#9
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Member Emeritus Group: Members Posts: 3,314 Joined: 26-March 03 From: San Francisco Member No.: 478 |
yeah, i realize that. still getting things set up. it collects heat when idling. when it moves it seems to cool fine. it would be HUGE to borrow you guys' LM-1. i'm gonna check my schedule and maybe tow up there. would bring copious amounts of beer, of course. |
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nebreitling |
Apr 12 2005, 06:00 PM
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#10
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Member Emeritus Group: Members Posts: 3,314 Joined: 26-March 03 From: San Francisco Member No.: 478 |
REALLY good idea, thank you. i'll ask around |
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ChrisFoley |
Apr 12 2005, 06:28 PM
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#11
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I am Tangerine Racing Group: Members Posts: 7,962 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None |
Even 1400 is lean! Temps at WOT are the only important ones as far as detonation is concerned. |
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TimT |
Apr 12 2005, 06:40 PM
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#12
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retired Group: Members Posts: 4,033 Joined: 18-February 03 From: Wantagh, NY Member No.: 313 |
Yes
I like to trot this out every once in awhile http://www.avweb.com/news/columns/182084-1.html Lots of good info.. and the rest of the articles are very informative also. Some people say that these articles only apply to Aircraft, I dont buy that.. |
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