compression test


Information and questions on GL1100 Goldwings (1980-1983)
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brewman
Posts: 16
Joined: Sun Nov 21, 2010 10:27 am
Location: claremore,ok
Motorcycle: 1982 GL1100A Aspencade

compression test

Postby brewman » Mon Aug 22, 2011 12:53 pm



I did a compression test on my "82" GL 1100 A with 111,000 miles on it. It smokes just a little when started cold then clears right up.It's been pinging alot when the throtle is open more than halfway,like trying to pick up speed at highway speeds.It has compression of 95,96 psi. on all 4 cyl. and will hold that pressure.My manual says it should be between 140 and 170psi.anything less than 140psi. the motor needs rebuilt. Wondering if anybody has had same situation? Thoughts,solutions.Thanks.



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moffat
Posts: 264
Joined: Thu Aug 05, 2010 2:30 pm
Location: Northwich United Kingdom
Motorcycle: 1982 GL1100
Interstate

Re: compression test

Postby moffat » Mon Aug 22, 2011 2:24 pm

How much Oil do you use? If the consumption of oil is a lot then at the milage coverered probably means at least new pistion rings. Try putting a spoon full of oil into the cylinders via the sparking plug hole and crank the engine over with the throttle wide open and measure the pressure then. If the pressure is significantly higher then the piston rings probably are worn.
Its a complete strip down to re ring a Goldwing- ( I am in the middle of rebuilding my 1982 GL1100 and its a big job!).
The pinging noise could be piston slap???????
Good luck

Goldwing 80
Posts: 39
Joined: Wed Jul 13, 2011 10:12 pm
Location: Geneva Ohio
Motorcycle: 1980 Honda Goldwing 1100

Re: compression test

Postby Goldwing 80 » Mon Aug 22, 2011 8:55 pm

brewman wrote:I did a compression test on my "82" GL 1100 A with 111,000 miles on it. It smokes just a little when started cold then clears right up.It's been pinging alot when the throtle is open more than halfway,like trying to pick up speed at highway speeds.It has compression of 95,96 psi. on all 4 cyl. and will hold that pressure.My manual says it should be between 140 and 170psi.anything less than 140psi. the motor needs rebuilt. Wondering if anybody has had same situation? Thoughts,solutions.Thanks.


When you did the compression test did you hold the throttle wide open? To get an actual reading the throttle must be wide open.

brewman
Posts: 16
Joined: Sun Nov 21, 2010 10:27 am
Location: claremore,ok
Motorcycle: 1982 GL1100A Aspencade

Re: compression test

Postby brewman » Mon Aug 22, 2011 11:53 pm

The bike uses about a quart and half per 5,000 mile.And I did not open throtle when i did compression test, not a big deal I'll just do it again in the morning and then try the oil in the cyl. if need be.Thanks for the input,I'll keep you posted on my progress.

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RBGERSON
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Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: compression test

Postby RBGERSON » Tue Aug 23, 2011 8:49 am

Yep open throttle a must, set valves first too..make sure they are right.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

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dingdong
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Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: compression test

Postby dingdong » Tue Aug 23, 2011 10:02 am

Pull all plugs also to do the test.
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

brewman
Posts: 16
Joined: Sun Nov 21, 2010 10:27 am
Location: claremore,ok
Motorcycle: 1982 GL1100A Aspencade

Re: compression test

Postby brewman » Tue Aug 23, 2011 11:41 am

Warmed up bike this morning,pulled all plugs,valves were adjusted about 1,000 miles ago(had this problem before valve adj. thought that might have been prob. but it didn't help.).Opened throtle and got much better readings:Rt FT-195 psi,Rt R-190 psi, Lt Ft-185 psi, Lt R-190 psi.

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eklimek
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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: compression test

Postby eklimek » Tue Aug 23, 2011 1:24 pm

111,000 miles and compression 185 - 195 in all cylinders?

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moffat
Posts: 264
Joined: Thu Aug 05, 2010 2:30 pm
Location: Northwich United Kingdom
Motorcycle: 1982 GL1100
Interstate

Re: compression test

Postby moffat » Tue Aug 23, 2011 2:42 pm

What instrument and method are you using to measure cylinder pressure as those readings are odd???? Are these readings with oil added to seal the rings for the test?
The maximum pressure when these machines are new is 171 psi. It seems you have beaten Mr Honda!! The amount of oil you are burning is high indicating a problem.
Has the engine been modified to increase compression?

brewman
Posts: 16
Joined: Sun Nov 21, 2010 10:27 am
Location: claremore,ok
Motorcycle: 1982 GL1100A Aspencade

Re: compression test

Postby brewman » Tue Aug 23, 2011 11:51 pm

I'm using an Equus guage,no oil added for test and engine is stock,I've owned it since it had 8,400 miles and my father in-law owned before me. I thought the readings were a bit high too.Maybe I'll barrow a guage from my buddy and see what I get,who knows my guage may be messed up.

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thrasherg
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Re: compression test

Postby thrasherg » Wed Aug 24, 2011 9:51 am

Whether the absolute number is accurate doesn't really matter, you are looking for differences between cylinders. Yours look to be very evenly spaced.. Clearly no one cylinder has a problem. The absolute numbers do look a bit high but if the bike is running well I would leave well alone. Smoking when you first start the engine is normal, as the bike sits on the side stand some oil will run into the lower cylinders (Left hand side) or leak past the valve seals into the cylinders, but as long as your oil consumption is not excessive, it is not going to do any real harm..

Ride it and enjoy it.. :)

Gary

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dingdong
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Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: compression test

Postby dingdong » Wed Aug 24, 2011 10:27 am

Those are very high readings. Numbers that high can mean excessive carbon build up inside the combustion chambers..
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

brewman
Posts: 16
Joined: Sun Nov 21, 2010 10:27 am
Location: claremore,ok
Motorcycle: 1982 GL1100A Aspencade

Re: compression test

Postby brewman » Wed Aug 24, 2011 12:31 pm

Ya,I borescoped the cyls. and it did look like a good bit of carbon in them,mostly on the pistons.




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