82 Aspencade High altitude power loss


Information and questions on GL1100 Goldwings (1980-1983)
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Gregboxster
Posts: 2
Joined: Tue Mar 16, 2010 10:23 am
Location: lhcaz
Motorcycle: 1982 Gl1100 Aspencade

82 Aspencade High altitude power loss

Postby Gregboxster » Mon May 16, 2011 1:35 pm



My bike runs great from sea level to 6000ft. Above 6000 ft there is a significant loss of power. Any ideas where to start checking.



RexAubrey
Posts: 110
Joined: Fri Apr 22, 2011 11:05 am
Location: Aldan, PA
Motorcycle: 1983 GL1100I GoldWing Interstate (Black)
1982 GL1100A GoldWing Aspencade (Maroon)
1981 Yamaha XJ550H Maxim (Black)
1979 Yamaha XS650SF Special (Black)

Re: 82 Aspencade High altitude power loss

Postby RexAubrey » Mon May 16, 2011 3:57 pm

Greg,

How often do you get that high :lol: ? no really how ofter are you above 6000', if it s fairly often you may want to check to see if you need to adjust fuel mixture for high altitude. If it is only for short periods of time a small adjustment may help.

Rex
Rex
1983 GoldWing Interstate, 1982 GoldWing Aspencade, 1981 Yamaha 550 Maxim, 1979 Yamaha 650 Special

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eklimek
Posts: 307
Joined: Tue Feb 15, 2011 1:55 pm
Location: St Catharines Ontario Canada
Motorcycle: 81 GL1100 (Widowmaker not in service), 83GL1100, CB350f x 6, CB400f x2, CB550f sold, CL350 (seized engine), plus enough donors to take me through retirement.

Re: 82 Aspencade High altitude power loss

Postby eklimek » Mon May 16, 2011 9:26 pm

Power will be less at altitude In normally aspirated engines because the absolute manifold pressure limits power output. The air-fuel mixture will also be too rich with lower air density and could be addressed by rejetting for altitude, but if you then descend to sea level the mixture will be lean.

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eklimek
Posts: 307
Joined: Tue Feb 15, 2011 1:55 pm
Location: St Catharines Ontario Canada
Motorcycle: 81 GL1100 (Widowmaker not in service), 83GL1100, CB350f x 6, CB400f x2, CB550f sold, CL350 (seized engine), plus enough donors to take me through retirement.

Re: 82 Aspencade High altitude power loss

Postby eklimek » Tue May 17, 2011 8:21 am


Gregboxster
Posts: 2
Joined: Tue Mar 16, 2010 10:23 am
Location: lhcaz
Motorcycle: 1982 Gl1100 Aspencade

Re: 82 Aspencade High altitude power loss

Postby Gregboxster » Tue May 17, 2011 11:52 am

I had a 1975 GoldWing I rode for 80,000 miles around Canada and the United States at all elevations with no noticeable power loss in the higher mountain elevations. This bike the 82 Aspencade is defininately loosing power at elevation. With two up you have to drop to 4th or even 3rd gear and can barely go 55mph. All four plugs are firing so I believe it is carburation. Do the diaphrams in the carburators somewhat compensate for mixture changes? I am looking for carburation sync and set up and what the bike does for elevation changes. I ride from about 4700 feet to 8000 feet regularly. I have an 86 V-max which I ride on the same roads with no ill effects.

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eklimek
Posts: 307
Joined: Tue Feb 15, 2011 1:55 pm
Location: St Catharines Ontario Canada
Motorcycle: 81 GL1100 (Widowmaker not in service), 83GL1100, CB350f x 6, CB400f x2, CB550f sold, CL350 (seized engine), plus enough donors to take me through retirement.

Re: 82 Aspencade High altitude power loss

Postby eklimek » Tue May 17, 2011 12:17 pm

86 V-max which I ride on the same roads with no ill effects


Yamaha Vmax at 145 HP (stock) 1/6 loss of horsepower due to air density might not be noticeable.
vs
Goldwing at 86 HP (stock) 1/6 loss of horsepower might be obvious.

(1/6 is the approx decrease in barometric pressure between sea level and 6,00 feet.)

Nevertheless, you describe a big change in performance. Makes one wonder about baseline operating condition of goldwing engine.

compression test?
air-fuel mixture rich at sea level?




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