Purpose of these holes?

[CHANMADD]

I would agree that their would definitely be a pressure difference between atmosphere and in the throttle chamber. When the motor is sucking at idle there is for sure a vacuum above the plates ......seems pretty obvious.....I think Fatboy just wants to argue....

[Jac Mac]

Originally Posted by CHANMADD

I would agree that their would definitely be a pressure difference between atmosphere and in the throttle chamber. When the motor is sucking at idle there is for sure a vacuum above the plates ......seems pretty obvious.....I think Fatboy just wants to argue....

Maybe, but all I can think of in his case is that he must be an interesting passenger anytime he flys in a planeto use his train of thought it wont matter if there is a hole in the wing..........

[FatBoy]

Originally Posted by Jac Mac

Maybe, but all I can think of in his case is that he must be an interesting passenger anytime he flys in a planeto use his train of thought it wont matter if there is a hole in the wing..........

Okay, good analogy. I'll need to think about that one.

Paul

[dcdoug]

Soooooo....

Leave as is, or plug with a small bit of RTV in some unnoticeable way?

[Jac Mac]

Originally Posted by dcdoug

Soooooo....

Leave as is, or plug with a small bit of RTV in some unnoticeable way?

As I think ERA Chas suggested, I would cover each hole with a small piece of duct tape for starters, then use a piece of perspex over the carb top to observe whether any fuel is being pulled from the main venturis at idle. If not and the idle quality does not change then a dab of devcon or epoxy on each hole should be a permanent fix ( RTV would swell & break down over time with exposure to fuel vapours etc ). If it still requires the holes for idle quality then you have to decide whether the road conditions etc that you normally drive on are going to cause any problems long term-dust-grit etc and if so look into conversion to later idle ezi system etc.

[WardL]

For what it is worth, I got my story backwards, at full throttle the vacuum would be low in the intake manifold and at idle the vacuum would be high. I still agree with most that they should be plugged temporarily to see what what happens, then when nothing noticeable happens, plug them permanently. Think about it, 99% of our carbs don't have the holes and they run fine. What else could be different with this carb to require the little holes?

[CHANMADD]

I know..!!! .....I know!!!!!1..........they're for Nitrous oxide jets..........