Wire mesh in GL1100 carb plenum?


Information and questions on GL1100 Goldwings (1980-1983)
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WingNutJC
Posts: 36
Joined: Tue Sep 03, 2013 9:12 am
Location: Brisbane, Australia.
Motorcycle: GL1100 Standard
Goldwing Streamliner
'03 BMW R1100S

Wire mesh in GL1100 carb plenum?

Post by WingNutJC » Wed Oct 11, 2017 2:30 pm



Hi Folks. :-)

Would anybody know the original purpose of these mesh screens?

When I acquired my 1100, the first job was to totally rejuvenate the carbs (although I didn't know that then ... :shock: ).
No - wait - actually the first job was to get them out of the bike, but that's another story ... :evil: :evil: :evil:

Anyway, I was surprised to find this mesh, gives its effect on airflow (-20% or so), but concluded Mr. Honda must have had a very good reason for its use.
Couldn't find any info about it, so I left it out when re-assembling.

Must say I can't complain about engine performance - typical Honda - pulls from the bottom, turbine smooth, and then the tach really takes off at about 5000 rpm. :mrgreen:
And gives a big push against my backside c/- step in the seat.
Having never ridden the bike with the mesh installed, I can't make any performance comparisons, but I'd be surprised if there wasn't a noticeable difference.

Cheers.

John C.



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ct1500
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Re: Wire mesh in GL1100 carb plenum?

Post by ct1500 » Wed Oct 11, 2017 5:38 pm

Flame arrestor in case of backfire or popping back in intake. About the same performance wise as running without an air cleaner. :)
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WingNutJC
Posts: 36
Joined: Tue Sep 03, 2013 9:12 am
Location: Brisbane, Australia.
Motorcycle: GL1100 Standard
Goldwing Streamliner
'03 BMW R1100S

Re: Wire mesh in GL1100 carb plenum?

Post by WingNutJC » Thu Oct 12, 2017 2:13 am

ct1500 wrote:
Wed Oct 11, 2017 5:38 pm
Flame arrestor in case of backfire or popping back in intake. About the same performance wise as running without an air cleaner. :)
Thanks ct. Now that you mention it, I think I heard something about that way back. Haven't had any of those probs myself. Could be that fuel is much better quality these days. Here in Australia I use 98 octane. Bike seems to love it.

BTW - that must be a terrible quality air cleaner to give so much restriction.
Going to do some pressure drop measurements to get a better idea re this. Will post results.

Cheers.

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newday777
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1983 GL1100A Wineberry to sell 36,000 miles

1999A Restored and sold at 19,000 miles

1999SE Totaled by cager at 105,000 miles

Re: Wire mesh in GL1100 carb plenum?

Post by newday777 » Fri Oct 13, 2017 6:28 am

As to your running 98 octane. Wings of all years are a low compression motor so no need for hi test fuels.

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WingNutJC
Posts: 36
Joined: Tue Sep 03, 2013 9:12 am
Location: Brisbane, Australia.
Motorcycle: GL1100 Standard
Goldwing Streamliner
'03 BMW R1100S

Re: Wire mesh in GL1100 carb plenum?

Post by WingNutJC » Mon Oct 16, 2017 8:43 am

newday777 wrote:
Fri Oct 13, 2017 6:28 am
As to your running 98 octane. Wings of all years are a low compression motor so no need for hi test fuels.
Hi newday777.

I use this fuel not so much for the high octane rating, but for:

(a) - high detergent level for removing carbon deposits, particularly on the back of inlet valves. High detergent is available only in the 98 octane.

(b) - higher energy density. BP introduced this fuel here about 15 years ago (also Shell and Mobil).
It's made by cracking long hydrocarbon chains into much shorter ones; meaning more "stuff" can fit into the same space - ie a higher density fuel = more energy available when burnt = better economy = more miles per tank.

Density of BP Ultimate 98 is approx 0.77g/ml, while for 91, it is 0.71g/ml.

At first, thought I was imagining the improvement, but then many ppl began to report the same thing. Have since proven it over the years.

Costs about 15c more per litre ($1.35 v $1.20), or in US terms: $5.13 vs $4.56 per US gallon. That's right!!! :shock: :evil:

Which almost evens out economy argument - BUT - I do get the benefit of carbon removal from the intake valves and combustion chamber = better breathing/efficiency/performance/economy. What's not to love?

This is the level of change I've seen re carbon deposits on the back of my GL's intake valves:






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