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scott s
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« on: August 05, 2008, 11:20:17 am » |
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Since I'm still basically in the break in period on my 2110cc, I've been hitting the engine with my IR temp gun every now and then just to check it out and to get a feel for "normal" for the engine.
I know that the IR guns aren't the most accurate way to measure absolute temps, but it's all I have and I can compare the engine to others I've had over the years.
So far, nothing really jumps out at me...the heads, sump, case, etc all seem within "normal" as far as what I've seen on my '63 and my old '66. BUT, the left carb (45 Dell w/ CB update kit) runs about 15-25 degrees hotter than the right carb. The left head is only slightly hotter....they always vary by a few degrees, even on my other engines....but it's consistently about 5-10 degrees hotter than the right head.
It's the carb that I'm really curious about. It's hotter by, on average, I'd say 15 degrees than the other side. Sometimes more. It's hotter from the manifold all the way up to the carb body.
My first thought is jetting, of course, but what? A plugged jet? Which one? Leaky O-ring (it's a Dell'orto, remember)?
I can't find any vacuum leaks. The carbs are synched. Linkage adjusted. Car runs OK, but it likes to idle around 1050-1100. I'd like to think I could get the idle down to ~850-900 with the Dells.
I haven't had a chance to pull the rear plugs yet and compare them. I'll try to do that soon.
Any thoughts or ideas? Or just forget it and drive on!?
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Logged
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Pull the pin and count to what?
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Mark Harney
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« Reply #1 on: August 05, 2008, 11:59:44 am » |
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I'd bet the left head is running hotter. Almost any shroud tends to do this. The aftermarkets are often worse about it than OEM.
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Logged
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I'm not expecting to grow flowers in the desert
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scott s
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« Reply #2 on: August 05, 2008, 01:59:29 pm » |
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I thought about that, too. I was aware of the #3 cylinder running hotter. The shroud is genuine German doghouse. All ( and I mean ALL) cooling tin is in place.
I'm gonna pull the two rear plugs this afternoon, just to have a look. So a temp. spread like that isn't really anything to be concerned about?
Oh, and I forgot to mention....just did the 600 mile tune-up, including valve adjustment. Didn't find anything out of the norm, so I don't think it's a problem with the head or cam (flat lobe or anything).
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Pull the pin and count to what?
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Mark Harney
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« Reply #3 on: August 05, 2008, 03:57:48 pm » |
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Realize that the temp of the carb and intake is a percentage of the temperature of the head, based on how fast it can absorb heat and what rate it can dissipate heat at, just like a heat sink.
So if it is a percentage of the head temp, then you can't assume that the temp difference in the carbs is the same as the temp difference of the heads.
What you CAN do is add some thermal barrier between the intakes and the heads, and/or between the intakes and the carbs. ANother gasket, phenolic spacer, etc.
There will still be some soak when you shut off the engine. The heat IN the intake tract will rise up, regardless of what thermal barrier physically separates the joints of the runner. It won't be as much, but they will still get warm. Too warm to touch for a long time is not unusual. I like to minimize it though.
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I'm not expecting to grow flowers in the desert
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martin
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« Reply #4 on: August 05, 2008, 05:00:18 pm » |
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Mark, don't you think there should be enough room in the sig line to include credit for yours? Stuart Adamson I guess. I think you're limited to just a few characters currently.
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68 White Cal look 2.3 efi turbo 194hp/240tq@wheels
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Mark Harney
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« Reply #5 on: August 05, 2008, 07:05:41 pm » |
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I'm a little busy living and breathing and seeing the sun in winter time for that.  I run out of characters before I can write much more.. but you can sure use your sig space to credit my sig line appropriately if you should choose. |
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I'm not expecting to grow flowers in the desert
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2332 baja
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« Reply #6 on: August 05, 2008, 08:47:04 pm » |
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This may be a bit of a stretch but here's my theory. The fan is on the right side of the engine so it's possible that there's more air moving past that carb than the left one. Since the carb is aluminum,,, the air going into the fan cools that carb a bit more than the other??? And, of course, the left head does run a little hotter even with all german tins in place. That's my 2 cents,,, may not even be worth that much  |
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Sam
lowered 65 driver
2332 drag baja ;-)
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J Dotson
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« Reply #7 on: August 05, 2008, 10:08:06 pm » |
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Idle that high hot I think of lean.What did your plugs look like? Did ya ever do a hard run on clean plugs, shut it off pull over and read them.Might need to richen up a little.What ya running on total advance timing?  |
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2stroke
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« Reply #8 on: August 06, 2008, 12:16:11 am » |
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I was testing a 2275 the other day and the drivers side was 20-40deg hotter than the pass side with a laser temp gun.
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ugly as sin, fast as hell!
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scott s
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« Reply #9 on: August 06, 2008, 08:47:00 am » |
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I never pulled the plugs...couldn't get to them without using the Weber Windows and didn't feel like jacking up the car and taking off the rear wheels in 98 degree heat yesterday.
It sounds like it's normal, though. I was just curious......
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Pull the pin and count to what?
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J Dotson
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« Reply #10 on: August 06, 2008, 09:43:29 am » |
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I never pulled the plugs...couldn't get to them without using the Weber Windows and didn't feel like jacking up the car and taking off the rear wheels in 98 degree heat yesterday.
It sounds like it's normal, though. I was just curious......
Scott....Get ya some nomex sleeves from one of the tool trucks and check it out, very easy tuning aid check.Now the bummer would be during just your break in period ya are melting some pistons, huh?  |
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« Last Edit: August 06, 2008, 09:45:22 am by J Dotson »
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