gl1100 vacuum pressure


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ax7el34
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gl1100 vacuum pressure

Postby ax7el34 » Thu Sep 17, 2015 8:15 am



Can anyone tell me what the vacuum at idle speed should be. I know carbs must be balanced. Just want to know if my in. Hg. Is in the ballpark. Thank you. Gl1100. 950rpm.
:lol:



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virgilmobile
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Re: gl1100 vacuum pressure

Postby virgilmobile » Thu Sep 17, 2015 9:03 am

No clue.Keep in mind,you cannot compare vacuum readings to what you read about for a car.This method measures vacuum on each cylinder.Your looking for equal amounts only.

indianakid
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Re: gl1100 vacuum pressure

Postby indianakid » Thu Sep 17, 2015 6:17 pm

it is around 10 inches.

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wingman12
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Re: gl1100 vacuum pressure

Postby wingman12 » Thu Sep 17, 2015 6:47 pm

As I remember when I synced the carbs on the 82 1100, you have to use the #3 carb as your base vacuum and I believe with my gauges is was around 23 psi. But the important thing is that they all need to be the same. set 1 & three the same then set 2 and 4 the same and then set 4 and 3 the same. you have synced your carbs. :D :D

ax7el34
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Re: gl1100 vacuum pressure

Postby ax7el34 » Fri Sep 18, 2015 10:15 am

Thanks for the reply. My question is was that 23 in Hg or was it 23 cm hg? I have synced mine. They are all balanced. 1981 gl1100. Brian, Wayne MI. My meter reads both.

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littlebeaver
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Re: gl1100 vacuum pressure

Postby littlebeaver » Fri Sep 18, 2015 10:47 am

10 inch I am sure is the correct answer, next to nothing in other words, not hardly enough to move the pick up coils but it's there providing you ain't got you none of them there air leaks...LOL :lol:

indianakid
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Re: gl1100 vacuum pressure

Postby indianakid » Sun Sep 20, 2015 11:32 am

to answer the OP question at idle (~950 rpm) the vacuum on each intake manifold will be "ballpark" 10 in hg.

for little beaver the vacuum advance does not use manifold vacuum. it is ported (venturi) vacuum. per the factory manual the advance starts to move at 1.6 in hg and will be all in at 3.2 to 3.6 in hg depending on year.

now a question for the beave. can just the cover for the pulse generator be removed with out removing the swing arm ???
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littlebeaver
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Re: gl1100 vacuum pressure

Postby littlebeaver » Sun Sep 20, 2015 8:14 pm

I am not positive to your question... I always just pull the swingarm off....

ax7el34
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Re: gl1100 vacuum pressure

Postby ax7el34 » Tue Sep 22, 2015 10:51 pm

All 4 carbs now are balanced in terms of vacuum. From the replies I am getting here that seems to be the big thing. Mixture is at 5/4 turns open on all four. Idle at 950 rpm. The vacuum reads 17 in hg. The tach is steady. I really don't get how the vacuum gets down to 10 in hg but it idles steady! Brian.

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Aussie81Interstate
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Re: gl1100 vacuum pressure

Postby Aussie81Interstate » Wed Sep 23, 2015 3:32 am

All carb sets will display different characteristics- due to the wear and condition of all the internal elements of the carbs themselves.

depending on how much wear is in the vacuum pistons - and if the bike is in tune or out of tune, valve settings etc..if everything was perfect we wouldn't have anything to do...




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