GL1100 Turbo Project

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ericheath
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Re: GL1100 Turbo Project

#16

Post by ericheath »

You should be able to adjust total timing by changing the length of the arm that the vacuum canister pulls. I believe it’s adjustable, but I’m not sure of how much.
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Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
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chris937
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Re: GL1100 Turbo Project

#17

Post by chris937 »

Thanks for the response Eric. I am particularly frustrated by this timing question because I cannot find a single document, web page, forum, or blog on the whole of the internet (via duckduck go, google, and yahoo) that provides a specification of *BTDC mechanical advance and/or *BTDC vacuum advance for any model of Goldwing 1000, 1100, or 1200.

The only reference I found after exhaustive searching is a randakk's blog post that effectively says "you won't miss the vacuum advance if it goes out."

Regardless, the engine is out. The starter clutch is going out so it's not like I could have avoided pulling the engine anyways. Guess it's TLC time.

Crazy how fast I went from this...
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To this cluster...
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PS - Anyone familiar with Roddy's Motorcycle Shop in Jamestown, Oh? I was told he works on Goldwings.
'75 R75/5
'77 GL1000 turbo
'79 SR500E
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ericheath
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Re: GL1100 Turbo Project

#18

Post by ericheath »

On 1000 models, the advance was on top of ignition timing. 75-77 had 5 degrees initial timing, 37.5 degrees total, or 32.5 degree mechanical advance. The 78-79 had 10 degrees initial, 37.5 degrees total, so 27.5 degrees mechanical advance.

I assume but cannot confirm the 1100 is the same. Hope that helps. You should be able to adjust yours enough for now to keep from blowing it up.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
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chris937
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Re: GL1100 Turbo Project

#19

Post by chris937 »

I believe that does answer my question, thank you. I was not 100% sure how to interpret the spec in the ‘81 manual.

That means this bike has 25.5* mechanical on top of 13* initial. I need to study the system and see if I can limit the mech advance to maybe 18*. I could retard the initial timing but I’d like to keep it feeling factory before boost comes on. Plus it spools quicker. :D
'75 R75/5
'77 GL1000 turbo
'79 SR500E
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chris937
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Re: GL1100 Turbo Project

#20

Post by chris937 »

Got the rear engine cover off. Starter clutch looks to be in great shape with the exception of one excessively worn roller keeper. Guess that's why it started to act up "for the first time" when I showed up to buy the bike.

Timing should be a piece of cake to limit max advance. I can only say that because I've now had the mechanism in my hands. Bending the limiting tabs inward to limit the mechanical advance may land me where I want to be without retarding base timing or sacrificing low end performance. I’ll do more thinking before I mangle any good parts.

On a related note, I believe I can retain vacuum advance below the boost threshold simply by employing a check valve that shuts as boost comes on. (Someone correct me if I'm wrong there!)

The worst and most time consuming part of this engine out job has been cleaning the old gaskets off of all the mating surfaces. I thought the smaller ones were a PITA until I realized I'll be pulling the clutch just to clean the engine surfaces so I can get the cover back on... wooohoooo

Guess I should probably install an upgraded clutch anyway. :D
'75 R75/5
'77 GL1000 turbo
'79 SR500E
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chris937
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Joined: Thu Dec 12, 2019 12:36 pm
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Re: GL1100 Turbo Project

#21

Post by chris937 »

Got the engine case back together after a clean up, fan switch, starter clutch, and a few words akin to “that’s good enough for now.”

This bike is going on hold until the turbo GL1000 I just picked up is back on the road. The other bike already has really the hard work done and appears to just need TLC.

If any forum members want this GL1100 super cheap in the meantime, PM me. It’ll need fresh tires, brakes, and carbs to be roadworthy.
'75 R75/5
'77 GL1000 turbo
'79 SR500E
Shadowjack
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Re: GL1100 Turbo Project

#22

Post by Shadowjack »

Vacuum advance is always on top of all other advance figures, and it was developed for fuel economy at light loads. It's generally around 15-20 degrees. At cruise you can get upwards of 50 degrees total, which drops back once you open the throttle and lose the vacuum. Once you get into boost, there's not going to be vacuum, by definition, so that's a non-issue.
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ericheath
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Re: GL1100 Turbo Project

#23

Post by ericheath »

Full advance of 1100 is 38.5 degrees. Everything I have read is that full advance is starting advance (10-13 degrees) plus whatever gets you to full advance. I’ve measured it on 1000’s but never checked 1100’s. The 1200 is touted to have more advance than previous models when not under load and in fourth or fifth gear, but 45 degrees total.

The 1100 ignition checks require to check the mechanical advance mechanism before the vacuum. From that I conclude it’s partly mechanical, partly vacuum controlled.

So even though the vacuum is not there in a blow through turbo, mechanical advance will be.

Not positive of what I wrote— waiting for correction if anyone knows.
Whatever I suggest here should be given ample time for a moderator to delicately correct. I apologize in advance.
77 WING, 1200 engine with 77 heads, cams, gl1100 foot pegs, Magna V65 front end, 764A carbs, [-gone Suzuki M109 monoshock--, replaced with gl1100 shocks] gl 1200 swing arm, gl1500 final drive, wheel and rear brakes Valkyrie seat, Meanstreak tank, Sportster pipes, Power Arc ignition off crank.
77 Wing. black
83 Wing, in pieces
"Continuing education is important even if the subject matter is fairly useless (as in this case)."---Greg Foresi
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