Port and Polish 84 Gl 1200 heads - Page 3 - Steve Saunders Goldwing Forums

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post #21 of 22 (permalink) Old 03-18-2019, 08:13 PM
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Join Date: Jul 2015
Location: Haltom city Texas
Year: 1991
Make: Goldwing
Model: SE
Posts: 1,395
I built the exhaust on my 82 and until now didnít understand why it ran so well,it had full size headers and a GS 1100 muffler,it had a flat spot in the rpm range so I had some different size holes water jet cut and fitted it where the muffler bolted to the header pipes,found the right one to clean it up,I think it was 1 1/4 inch.Mine sounded a lot different than a stock motor.

Love chasing white lines but they are difficult to catch.Hate drivers with no STOPLIGHTS.

1968 Kawasaki Avenger
1969 H1 Kawasaki
1975 1000
1985 LTD
1982 1100,STANDARD
1991 ST 1100
1991 SE Goldwing.
1995 BMW R 1100RS
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post #22 of 22 (permalink) Old 03-18-2019, 11:18 PM
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Join Date: Oct 2006
Location: Green Bay, Wisconsin, USA
Year: 1999
Make: GL1500 SE
Posts: 5,491
Originally Posted by trike lady View Post
I'd like to see a pic of this hot rod BMW you have. Many members here are proud of their builds and post their progress.
A little bit of knowledge can be dangerous. If you just get in there and start hogging things out odds are pretty good you will hurt performance. Matching the bottom of exhaust ports is never good as it increases reversion when the cam is on overlap. Bigger port sizes can hurt performance because it slows the speed of the air in the port. That causes fuel drop out and hurts low end torque. I bet Joe Average would have to be pretty lucky to improve over all performance with a grinder more than a couple of percent which would be negligible and not worth the effort. If you want to improve overall performance invest in a good 3 angle valve job and leave it at that. Most performance increase is right at the bottle neck where the valve and seat intersect.
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Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.
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