GL1100 Cold Air Intake Pipes


Information and questions on GL1100 Goldwings (1980-1983)
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dwight007fchr
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GL1100 Cold Air Intake Pipes

Postby dwight007fchr » Mon Oct 17, 2016 6:41 pm



I have a question regarding the 4 Air Intake Pipes between the carbs and the engine. I just rebuilt the carbs on my 1983 GL1100 and now the bike sounds great when running. I synced the carbs, and the only issue seems to be that she slowly begins to smoke after running five minutes or so. She does not smoke on start-up, but only as she warms up.

Yesterday when she was running, I was checking the temperature of the intake pipes on all 4 cylinders, and was surprised to find that the left side (cylinders 2 and 4) were cool, while the right side (cylinders 1 and 3) began to get warm as the engine warmed up. Pics of intake pipes:

No. 4 runs real cold
No. 4 runs real cold


Today I checked again after she had run for about 10 minutes, and No. 2 and No. 4 were still cooler than No. 1 and No. 3, and it was amazing that the No. 4 intake pipe was super cold, almost like an air conditioning freon line. No. 1 and No. 3 air intake pipes were real warm, and I could not keep my hand on the lower portions due to the heat.

No. 1 and No. 3 run warm
No. 1 and No. 3 run warm


So my question to the experts is why would one air intake pipe run almost ice cold and others run hot?



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julimike54
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Re: GL1100 Cold Air Intake Pipes

Postby julimike54 » Thu Oct 20, 2016 7:57 am

Maybe you can learn why here......
http://classicgoldwings.com/forum/viewt ... 07&t=11702
Seems like a lot of variables
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dwight007fchr
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Location: Culpeper, Va
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Re: GL1100 Cold Air Intake Pipes

Postby dwight007fchr » Thu Oct 20, 2016 8:19 am

julimike.......interesting experiment that guy did by adding thin rubber insulation pad between intake horn of No. 4 and the engine.......ran about 25 degrees cooler on that intake horn.

Good idea, but I tell you......I barely have room to squeeze those round rubber ORings up under the horns, and not sure if there is room to be fooling around with another rubber pad on all 4 horns. Now, if someone could invent this insulating rubber pad with the Orings built in, that might be easier to install.

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spiralout
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Re: GL1100 Cold Air Intake Pipes

Postby spiralout » Thu Oct 20, 2016 10:00 pm

I didn't read the whole thread that julimike54 linked but I saw that it was for a home built single carb manifold. I used to read a lot of thread about those mods on different sites and they were always having problems with intake temps.
Have you checked your exhaust header temps to see if the left side is staying cooler and not causing the left head to heat up at the same rate as the right side?

dwight007fchr
Posts: 435
Joined: Mon Nov 15, 2010 9:43 pm
Location: Culpeper, Va
Motorcycle: 1983 1100 Goldwing Interstate

Re: GL1100 Cold Air Intake Pipes

Postby dwight007fchr » Fri Oct 21, 2016 7:58 am

Conclusiion:

On another thread "Fresh carb rebuild and Engine Knocking", I posted the answer to the cold intake pipe. In summary, the No. 4 float valve was letting too much gas into the carb, and it seems it was a result of too much gas pressure from the fuel pump. I had used a half gallon jug mounted to the foot peg beside the fuel pump as the gas supply. There was not enough flow restriction from the gas tank like is normal, so I guess the pump could pump at a higher pressure, and the carbs could not handle it.

I filled the tank with 5 gallons of fresh non ethanol gas, and installed the gas lines and fuel filter, and now she runs perfect......no white smoke at all.

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spiralout
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Re: GL1100 Cold Air Intake Pipes

Postby spiralout » Fri Oct 21, 2016 8:09 am

I thought you'd started this thread since then. I normally pay more attention to the dates of posts. My fault.

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WingAdmin
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Re: GL1100 Cold Air Intake Pipes

Postby WingAdmin » Mon Oct 24, 2016 9:56 pm

Incidentally, thinking about cool pipes vs warm pipes: remember that evaporation is an endothermic process - it uses up heat. Evaporating fuel into the airstream lowers the temperature, significantly. This is why you can get carburetor ice when it is 70 degrees outside.

dwight007fchr
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Re: GL1100 Cold Air Intake Pipes

Postby dwight007fchr » Tue Oct 25, 2016 7:33 am

WingAdmin......Regarding the evaporating fuel and ice cold intake pipes, with our GL1100s this is a sign that the carbs are not properly adjusted or there is some problem. All 4 intake pipes should get a bit warm, but not have one or all run cold......right?

A cool add-in would be 4 temp sensors on the intake pipes and a display up on the dash giving precise temp readings. Hey.....could screw them into those 4 vacuum screw holes which are used for the carb syncing.




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