 CHT temps, individual cylinder differences? |
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| falcor75 |
 Apr 12 2018, 10:50 PM
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Senior Member  Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia 
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For those of you that are running 4 CHT sensors under the plugs, what differences do you see between the cylinders?
Whats your typical temps for each cylinder with: A: Engine warmed up sitting at idle for a minute or two. B: Engine warmed up, cruising at 50-55 mph in fifth gear. |
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| Elliot Cannon |
Apr 14 2018, 03:46 PM
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914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
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Coming home from Rt. 66 a number of years ago, I was driving up a very VERY long up hill stretch west of needles into about a 50 mph wind. The throttle wouldn't answer to accelerate and when I looked at the head temp. it was way over 400 degrees. Way over! I pulled over, let it cool, drove from then on in 4th gear and about 60-65 mph. The engine temp. cooled down nicely, to the usual 325-350 and stayed that way till I got on the other side of the mountain and then resumed in 5th gear. I should mention that when I stopped and pulled over to let it cool, I almost couldn't open the door to get out, the wind was so strong.
When the cyl. head temps go up, drop a gear, the higher rpm's mean the engine is working less hard and the fan speed also increases. Thanks to Joe Sharp for the advice. (IMG:style_emoticons/default/pray.gif) (IMG:style_emoticons/default/smoke.gif) (IMG:style_emoticons/default/driving.gif) |
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| worn |
Apr 14 2018, 05:33 PM
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#3
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can't remember Group: Members Posts: 3,143 Joined: 3-June 11 From: Madison, WI Member No.: 13,152 Region Association: Upper MidWest
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QUOTE(Elliot Cannon @ Apr 14 2018, 01:46 PM)  Coming home from Rt. 66 a number of years ago, I was driving up a very VERY long up hill stretch west of needles into about a 50 mph wind. The throttle wouldn't answer to accelerate and when I looked at the head temp. it was way over 400 degrees. Way over! I pulled over, let it cool, drove from then on in 4th gear and about 60-65 mph. The engine temp. cooled down nicely, to the usual 325-350 and stayed that way till I got on the other side of the mountain and then resumed in 5th gear. I should mention that when I stopped and pulled over to let it cool, I almost couldn't open the door to get out, the wind was so strong. When the cyl. head temps go up, drop a gear, the higher rpm's mean the engine is working less hard and the fan speed also increases. Thanks to Joe Sharp for the advice. (IMG:style_emoticons/default/pray.gif) (IMG:style_emoticons/default/smoke.gif) (IMG:style_emoticons/default/driving.gif) I built a 2056 with too much compression and a non-stock cam. Rebuilt the manifold pressure sensor and have to run richer than I want to in order to keep below 400. My experience with fourth gear hasn’t been positive. Louder, but not much cooler. Excellent motivation for a six |
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Posts in this topic
falcor75 CHT temps, individual cylinder differences? Apr 12 2018, 10:50 PM
Porschef :popcorn: :beer3: Apr 13 2018, 04:19 AM era vulgaris I don't own the car anymore, but on my old 75 ... Apr 13 2018, 06:38 AM
Vacca Rabite
So please, don't EVER cruise in 5th at 50-55m... Apr 13 2018, 07:23 AM Mark Henry
So please, don't EVER cruise in 5th at 50-55... Apr 14 2018, 07:08 PM falcor75 Thanks for the replies, hope some more people chim... Apr 13 2018, 11:50 PM era vulgaris Dual carbs, or FI? If dual carbs, then your carbs... Apr 14 2018, 07:29 AM MikeM This is a great reminder... but I've always wo... Apr 14 2018, 09:10 AM era vulgaris
This is a great reminder... but I've always w... Apr 14 2018, 10:32 AM Boomingbeetle Warm at idle on my 2430 with stock fan/cooling and... Apr 14 2018, 10:28 AM Boomingbeetle Here it is 10min driving at 3250-3500 rpm in 5th. ... Apr 14 2018, 10:32 AM falcor75 I've got itbs and FI.
I've measured my ai... Apr 14 2018, 12:26 PM era vulgaris
I've got itbs and FI.
I've measured my a... Apr 14 2018, 02:41 PM falcor75
I've got itbs and FI.
I've measured my ... Apr 15 2018, 01:12 AM Boomingbeetle Sorry for the sideways pictures, they are not rota... Apr 14 2018, 04:30 PM falcor75 Just spend the last 3 hours fiddling with the thot... Apr 15 2018, 05:28 AM barefoot
Just spend the last 3 hours fiddling with the tho... Apr 16 2018, 02:12 PM jd74914 What is your target AFR? Or do you have a screen s... Apr 15 2018, 08:22 PM Dave_Darling
You could see lower flows if you have some valve ... Apr 15 2018, 09:25 PM jd74914 Good point. Totally forgot about that. Apr 16 2018, 05:35 AM falcor75 Target lambda is around 0,92 (8% more fuel than la... Apr 16 2018, 09:22 AM falcor75 I cant get a 0,05 mm feeler gauge in so both butte... Apr 17 2018, 03:42 AM falcor75 I spent 20 minutes this afternoon swapping the #1 ... Apr 18 2018, 01:37 PM falcor75 Had a 40 minute drive today, starting with slower ... Apr 20 2018, 08:08 AM jcd914 After reading through this and your struggles to g... Apr 20 2018, 11:25 AM falcor75 No they only have one air bleed screw for each pai... Apr 20 2018, 12:01 PM jcd914 Too bad.
Their description says there is a vacuum... Apr 20 2018, 05:29 PM falcor75 Yes I'm not sure there's any fault with th... Apr 20 2018, 11:42 PM |
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