'76 Goldwing GL1000 "Deathwing"

[Drew]

I wasn't thinking of fuel, just air

Still not an issue untill the revs get high. Consider the carb on an old V8. Sure, it was a limiting factor of the performance. But only once you opened the pipes up and let the thing breath anyway.

The reason I mentioned fuel, is that if the carb wasn't built for a multi cylinder motor, it might not have enough gas in the bowl for two sucks every 360 degrees. Otherwise it's all gravy.

[scumdog]

Still not an issue untill the revs get high. Consider the carb on an old V8. Sure, it was a limiting factor of the performance. But only once you opened the pipes up and let the thing breath anyway.

The reason I mentioned fuel, is that if the carb wasn't built for a multi cylinder motor, it might not have enough gas in the bowl for two sucks every 360 degrees. Otherwise it's all gravy.

Total c.f.m. is the limiting factor.

[Drew]

Total c.f.m. is the limiting factor.

Cubic feet per mintue?

[blackdog]

Cum Face Mate.

[Mental Trousers]

Cock Fondling Monkey

[durp]

Cuckold Filling Man-jam

On that note... The chances of the S&S working are 50/50. The length of the tubes definitely won't be a problem on this. But if this carb doesn't end up doing the trick I'll need to go with a kitted vw carb. This S&S is really meant for big fatty harleys. But its adjustable, so we'll see what we get.

This will likely be a game of trial and error. But itll get there.

[scumdog]

Cubic feet per mintue?

Almost.
Change mintue to minute.

[Drew]

Almost.
Change mintue to minute.

Always wondered if that's what it meant.

[Drew]

Almost.
Change mintue to minute.

Always wondered if that's what it meant.

So it's fairly straight forward to work out if a carb is big enough, standby...

1cf=30.48cl

1.5lX6000(Half the revs because each slug fires .5 times per revolution)
9000litres

9000l/30.48l
295.28


295CFM carb, will flow enough air without restriction, for a 1500cc engine that revs to 12,000 RPM. I couldn't find what the red line on a GL is, but I doubt it would be higher than that.

That's not a very big carb at all.

I'm glad I've wasted all this time working it out.

[Eddieb]

295CFM carb, will flow enough air without restriction, for a 1500cc engine that revs to 12,000 RPM. I couldn't find what the red line on a GL is, but I doubt it would be higher than that.

That motor is only 1000 or possibly 1100cc and redline is 8k according to this private for sale advert http://www.americanlisted.com/colora..._16345581.html, plus I found a few videos on youtube showing the rev counter that supported that.

Here's another good intake mod

[Drew]

8k according to this private for sale advert http://www.americanlisted.com/colora..._16345581.html, plus I found a few videos on youtube showing the rev counter that supported that.

Sweet, even smaller then.

[Drew]

Here's another good intake mod

I'm a turbo fan myself. Prolly because they can be mounted where ever the hell ya want them.

[Eddieb]

I'm a turbo fan myself. Prolly because they can be mounted where ever the hell ya want them.

Me too as you don't have the mechanical loss usually associated with driving a Supercharger, however the whole Goldwing motor and frame layout really suits this sort of installation.

Back to my orignal query. I was wondering about the volume of the red section in the picture attached being able to satisfy the demands of the intakes shown green, also whether having no airbox or similiar chamber would have any impact on the intake system, does it matter? will it affect intake behavior in any way?

[durp]

The center section is only slightly larger then the 4 intake tubes. But the inside diameter of the tubes are the same as the original carbs. But the fuel delivery isn't going to be the issue here. It will only suck gas in one at a time per cylinder anyway.

Few more updates:

[Drew]

It will only suck gas in one at a time per cylinder anyway.

This was my original point.

However, the throttle body needs to be able to flow enough air for maximum revs. A 100CFM throttle opening will happily feed one of the pistons on your motor at 8,000RPM. But since the air for more than one cylinder needs to be in the pipe once the revs get up there, the max CFM needs to match all four slugs needs.

PS, if you can mount the carb at the rear of the manifold, there will be less flow disruption, and much better fueling.