 Head temp differences, How big is too big? |
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| lapuwali |
 Apr 29 2004, 12:59 PM
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#1
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Not another one!  Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743   |
I recently fit a CHT gauge, and originally put the sender under the #4 plug. Readings were in line with what I've read here: idled at 300dF, cruised at 325-350dF, touched 400dF under heavy load (lots of long uphill grades here).
I moved the sender to the #1 plug yesterday, and the temps are as much as 50dF lower across the board. Idles at 250dF, cruise about 300dF, never exceeds 350dF even pulling up a long hill. I expected a difference, but not 50dF (20%!) between heads. I'm running Webers, so it's possible I have completely different mixtures for each cylinder. I presume cooler head temps would usually mean richer? This would be in line with plug colors (blacker on the 1/2 head, tanner on the 3/4 head). Hmmm.... |
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| mightyohm |
Apr 29 2004, 03:45 PM
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#2
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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 |
Not long ago I installed cooling flaps on my 1.7. Not knowing how they were supposed to fit I first put them in WRONG so that the right side flap was blocking all the air to that side of the engine. I drove around town for 30 minutes and noticed the car was running real rough at idle. When I got home I could FEEL the temperature difference across the engine!
PS. The engine still runs today.. and yes I am an idiot. (IMG:style_emoticons/default/aktion035.gif) |
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Posts in this topic
lapuwali Head temp differences Apr 29 2004, 12:59 PM
Jake Raby Absolutely...
50 degrees from the 1-2 bank to the... Apr 29 2004, 03:23 PM dmenche914 I'll be getting head temp senders on mine, all... Apr 29 2004, 03:56 PM Jake Raby The replacement shroud is a 100% knockoff of a sto... Apr 29 2004, 04:12 PM lapuwali Wait a minute. Is a 50dF difference "typical" or ... Apr 29 2004, 04:26 PM jkeyzer It can be typical and still be bad for making powe... Apr 29 2004, 04:45 PM Jake Raby I'm saying that a 50 degre difference is typic... Apr 29 2004, 05:11 PM tracks914 50*F from front to back is OK (1-2 and 3-4)
But 30... Apr 29 2004, 05:14 PM Jake Raby Bank to bank... meaning:
cylinders 1-2 are a pair... Apr 29 2004, 06:08 PM Dave_Darling So you're actually going to make another new c... Apr 29 2004, 06:27 PM Jake Raby Yes, the mold is being made now... It loks 100%fac... Apr 29 2004, 09:02 PM dmenche914 goodness sake jake (hey that rhymes) You are doin... Apr 30 2004, 12:09 AM Jake Raby ALL the cooling results from the TIV and TI test w... Apr 30 2004, 06:45 AM lapuwali There were several holes left in the tin from the ... Apr 30 2004, 12:30 PM
dmenche914 yes, all the correct seals on the holes are import... Apr 30 2004, 10:47 PM |
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