81 GL1100i Vacuum advance question


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scotterichmond
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81 GL1100i Vacuum advance question

Postby scotterichmond » Fri Jul 27, 2012 5:22 pm



Can anyone tell me how much the vacuum advance is suposed to advance the timing when it is working correctly?

On Randakk's site he addresses this and says to cap it off at the carb, and you won't notice a it gone.
(for those with a bad vacuum chamber).

Here is a link to his tip.
http://randakks.com/TechTip71.htm

Scott



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Johnyy Smoke
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Re: 81 GL1100i Vacuum advance question

Postby Johnyy Smoke » Fri Jul 27, 2012 6:19 pm

Take the hose off the carb-and suck on it-if engine revs up -It is working.Sounds tech enough to me.Regards,Johnyy

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virgilmobile
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Re: 81 GL1100i Vacuum advance question

Postby virgilmobile » Fri Jul 27, 2012 6:47 pm

A vacuum gauge attached to the carb at the vacuum advance port will show 0" vac at a idle and peak at near 5" when revved up.
I believe the actual specs are in the manual but it's something like another 10* beyond the mechanical advance.

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Re: 81 GL1100i Vacuum advance question

Postby scotterichmond » Sat Jul 28, 2012 9:20 am

Well I did what Randakk suggested, the vacuum chamber does leak ( won't hold a vacuum) so I capped off the nipple at the carb . the bogg down at wide open throttle is gone. Whoo hoo !. Randel saysIi wouldn't notice a difference, but I feel a slight( and I mean small) stumble off idle ........... I'd say it is holding back, just when the throttle is cracked open. I can put things back to where they should be, and it is back to where I was. Cap it off again , and now I'm back to where I am .

So , all that to say this; I will live with it capped off for now, but I am the kind that wants to make it "right".
I will do some research to find a solution the replacing that vacuum advance chamber, you can bet on that.
It looks alot like some of the 70's advance units from cars I have worked on......hummmmmmmmmmmmm!

Scott

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scotterichmond
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Re: 81 GL1100i Vacuum advance question

Postby scotterichmond » Sat Jul 28, 2012 9:22 am

virgilmobile wrote:A vacuum gauge attached to the carb at the vacuum advance port will show 0" vac at a idle and peak at near 5" when revved up.
I believe the actual specs are in the manual but it's something like another 10* beyond the mechanical advance.

It also gives you some advance just off idle.

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scotterichmond
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Re: 81 GL1100i Vacuum advance question

Postby scotterichmond » Sat Jul 28, 2012 9:30 am

virgilmobile wrote:A vacuum gauge attached to the carb at the vacuum advance port will show 0" vac at a idle and peak at near 5" when revved up.
I believe the actual specs are in the manual but it's something like another 10* beyond the mechanical advance.

The advance unit give you some advance just off idle too.

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virgilmobile
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Re: 81 GL1100i Vacuum advance question

Postby virgilmobile » Sat Jul 28, 2012 7:45 pm

Sure will.A couple of degrees.
Generally,few people wouldn't notice without being able to compare between them,but I can feel the "G's" with the throttle and can equate that to the power curve.Operating with and without the vacuum advance working properly does affect the power curve.

Now if you only have a idle or a wide open throttle type of driving and are running at 5 grand most of the time,you probably wouldn't notice or care.
I just really like the curve to rise quick and pull like a truck the rest of the way.

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scotterichmond
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Re: 81 GL1100i Vacuum advance question

Postby scotterichmond » Tue Jul 31, 2012 1:03 pm

Hey anyone, would it be possible to find out how much throw the vacuum chamber has.
I have found one for a 81-84 ford with the needed vaccum caracteristics (starts to open @1.7 and ends @3.5) that's close to Honda specs Looks like it would be easy to mount up.

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scotterichmond
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Re: 81 GL1100i Vacuum advance question

Postby scotterichmond » Tue Jul 31, 2012 2:14 pm

I just bought this one for $28 w/shipping, now I will have one to mess with.

http://www.ebay.com/itm/380450609125?it ... m=&vxp=mtr




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