single carb

[Beau-Kat]

Maybe a 500 Holley 2bbl would work. Don't remember the specs for that carb though.

 

In the 70s, I had one on a souped up 240 ci Ford straight six. A 650 carb was too much, but the 500 made it run like a hot rod.

[greg_in_london]

It does look as if it would shortcut a project for fuel injection. Switching to one fuel input will surely not improve power, but with my bike and sicecar (and trailer tent) I'd like better starting, cleaner cruising and, most of all, better mpg while pulling hard at 60-65mph.

 

If no-one has done this on a Venture yet, has anyone done a report on a [cough, spit] GW or anything else ?

[bongobobny]

Maybe a 500 Holley 2bbl would work. Don't remember the specs for that carb though.

 

In the 70s, I had one on a souped up 240 ci Ford straight six. A 650 carb was too much, but the 500 made it run like a hot rod.

240ci is a bit bigger than 1300cc! Also, regardless of carb size you are still going to be throttled down (orifaced) by the diameter of the intake on top of the manifold.

 

As stated in the ad, this setup is a quick reliable fix for our complicated 4 carburetor setup but it will not perform quite as well as a properly serviced and set up stock system, but will be a lot more maintenance free...

[hushpuppy]

I don't know any Gold Wing forums- If someone is a member of such a forum could you ask if they have any information on these systems? Thanks, Hushpuppy

[Flyinfool]

OK, math time.

 

Our engines are 1300 cc, that is 79 cubic inches. I'll call it 80 just to make the math easier to follow.

since we have a 4 stroke engine that means that it can only pull in 40 ci per revolution.

If red line is set at 8000 rpm that means that the air intake will be 320,000 cubic inches per minute. Since auto carbs are rated in cfm (cubic feet per minute) you have to divide by 1728 to make the conversion.

so 320,000 / 1728 = 185 cfm

 

Now all of that math is ASSUMING 100% volumetric efficiency which you will never see on a normally aspirated engine. With the small diameters and sharp bends in that manifold 75% volumetric efficiency would be a good guess.

 

so 75% of 185 is 138 cfm. A 138 cfm carb is what you would want on top of there.

Going to big on the carb will really kill the bottom end and adds nothing to the top end.

 

Now on the other hand, If you add a turbo or super charger, then you can get up over 100% volumetric efficiency and be able to make proper use of a much bigger carb.

 

Even that VW carb might be to big for our little motors.

 

There will be a test later.........

[Yammer Dan]

OK, math time.

 

Our engines are 1300 cc, that is 79 cubic inches. I'll call it 80 just to make the math easier to follow.

since we have a 4 stroke engine that means that it can only pull in 40 ci per revolution.

If red line is set at 8000 rpm that means that the air intake will be 320,000 cubic inches per minute. Since auto carbs are rated in cfm (cubic feet per minute) you have to divide by 1728 to make the conversion.

so 320,000 / 1728 = 185 cfm

 

Now all of that math is ASSUMING 100% volumetric efficiency which you will never see on a normally aspirated engine. With the small diameters and sharp bends in that manifold 75% volumetric efficiency would be a good guess.

 

so 75% of 185 is 138 cfm. A 138 cfm carb is what you would want on top of there.

Going to big on the carb will really kill the bottom end and adds nothing to the top end.

 

Now on the other hand, If you add a turbo or super charger, then you can get up over 100% volumetric efficiency and be able to make proper use of a much bigger carb.

 

Even that VW carb might be to big for our little motors.

 

There will be a test later.........

 

 

 

I got a extra TURBO setup.....

[bongobobny]

***sigh***

 

 

It's been a looooong winter...

[dacheedah]

Gotta love this forum

[hushpuppy]

perhaps an older VW carb.- the first VW I ever had had a 1300cc sized motor.- Not very different in size.- Hushpuppy

 

I know some newer VW's were 1600cc.

[bongobobny]

perhaps an older VW carb.- the first VW I ever had had a 1300cc sized motor.- Not very different in size.- Hushpuppy

 

I know some newer VW's were 1600cc.

Yup, which makes them a reasonable choice, only slightly over carbeureted...

[PKR Customs]

It does look as if it would shortcut a project for fuel injection. Switching to one fuel input will surely not improve power, but with my bike and sicecar (and trailer tent) I'd like better starting, cleaner cruising and, most of all, better mpg while pulling hard at 60-65mph.

 

If no-one has done this on a Venture yet, has anyone done a report on a [cough, spit] GW or anything else ?

 

I don't know any Gold Wing forums- If someone is a member of such a forum could you ask if they have any information on these systems? Thanks, Hushpuppy

 

I have posted the link to a video of the custom setup I have on my 83. I also have a post in the first ten tech section that has a lot of information and answers to questions anyone may have.