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Anyone run a single carb?

  • Thread starter Thread starter kyle.quamme
  • Start date Start date
One thing that I thought I'd mention. Won't the velocity of the air flow on the end cylinders be decreased unless you taper down the size to the end inlets. Or just leave the inlets the same and make the manifold opening larger by the carb for the feeders for the end carbs. I really don't know much about airflow, but we use this principle for metal flow in our aluminum die cast dies at work.
 
"I don't get it. What's the reference to? "

"Notice the lengths..."

Yea, I was thinking that Ford manifold would bolt right up....

My point was that the distance from the inlet to the outlet ports are not the same, however the distance from the plenum to each port appears matched.

This would be an interesting problem to model.
 
drhach said:
I don't get it. What's the reference to? That they are all equal length? Or that he should buy one of those cast iron manifolds for his bike?
Click to expand...

O man, ur a piece of work. Those designs are what i wanted to make originally, just in appropriate lengths for my bike.
 
"Yea, I was thinking that Ford manifold would bolt right up...."

You should do it before Billy Lane steals your idea.


Your reference to inlet location doene't really mean anything. If you have a plenum, it doesen't matter where the inlet is (to a point). That's why you use a plenum. There is a charged mixture in the plenum waiting to be pulsed in to the next available tract. As you increase plenum size, you lose throttle response. The rule of thumb is twice the engine volume (not the gospel).
 
drhach said:
"Your reference to inlet location doene't really mean anything. If you have a plenum, it doesen't matter where the inlet is (to a point). That's why you use a plenum.
Click to expand...

Polly want a cracker?
 
drhach said:
you may want to consider something like this. Note the lengths....
Click to expand...

This appears to be a very well designed single carb setup.
You said in your first post that "ease of tuning" was the main reason for fitting up a sigle carb.
Those cast manifolds that have been shown will work ok. However, you must expect to loose some performance from your existing 4 carb setup.
Those cast manifolds are manufactured that way to keep the costs down for the manufacturer. They are a no nonsense, average performance solution which Jo Public generally accepts.
Whenever you introduce right angle kinks into a gas flow, you create resistance to flow (drag). This is why most serious race engines have the inlet tracks aligned as close as possible to the valve pocket/seat areas. This is also true of the manifold tracks.
If ease of tuning is your only concern, go for it.
 
lecroy said:
Polly want a cracker?
Click to expand...

Are you always this sensitive when someone isn't clear about what it is you're tlaking about or possibly even disagrees? It may be time to stop taking yourself so seriously.
 
LMFAO!!!

I thought it was already covered. You know, like a parrot, repeats what you say.... LOL
 
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