inlet manifold question

paulfordy

paulfordy

0
On the inlet section of the manifold there is what appears to be a brass jet the same as a carb jet screwed into the casting.IS this meant to be there and what purpose does it serve[?].

thanks!:D
 
or it could be a vacume take off to work the mr whippy machine,ha ha ,only joking matey you make a great read.:D[}:)]
 
Nitrous oxide?..lol!...could be fun chewing on the steering wheel with the rear axle wedged between ya butt cheeks!!

:D:D
 
Hi Paul, it could be the manifold drain. Yes it is actually designed to dribble petrol all over the floor if your carb isn't set up right. Both of my vans reeked of fuel for half an hour after the engine was switched off, I didn't dare light the stove even when gasping for a brew after a long drive. A carb overhaul kit and careful setting up of the float height almost sorted it out. Anyone else had this problem. [?]
 
paul you didn't say weither it was on the top or the bottom :I if it's at the bottom most likly panky is correct :D
 
Here is a photo of the manifold with the mysterious brass jet...

Picture056.jpg


Anyone who can tell me what purpose it serves wins a 99 flake ice cream!;)(bubblygum will cost you extra though!)[}:)][^]
 
i have one on mine but it has about two inches of copper pipe coming off it, but i am non the wiser as to what its for. will dig out my manual.. doubt it will explain tho:)
 
Hi Paul, The Brass Jet you refer to is called the `Induction Manifold Drain Pipe`. According to the workshop manual for the `commer,dodge and fargo light van models, it should be kept clear at all times. Sorry i don`t have any pictures in the manual to show whether there should be a pipe comming off of it. Nor does it explain exactly why its there.
 
It's the two inches of copper pipe that stop overflowing petrol from dribbling onto the exhaust manifold [:0], bet yer new Transit doesn't have one of them.
 
Most Rootes inlet manifolds have a drain tube facility to lose excess fuel under 'cold start'/flooding scenarios, or for any other occasion when surplus fuel would otherwise sit in the manifold when the engine was no longer running. However, they should preferably not be blanked off for 'simplicity' and they should never be fitted with just a straight bit of pipe because that would theoreticaly upset the mixture settings, particularly under slow running conditions. Sometimes there is a simple ball bearing manifold vacuum operated shut-off valve on the lower end of the pipe but usually the pipe is just tapered to a small final outlet diameter so that incoming air flow is extremely limited and won't really affect the fuel vaporisation process post the correct carb venturi activity.

If you need to create a new one then consider carefully the appropriate length and pipe run to keep the fuel drips away from the hot exhaust manifold. I should have various spare examples but not many of them come from Commer vans, more likely Minxes, etc.
 
hi my inlet has this pipe it is just like a brake pipe tapered down at the end with a 1mm-0.5mm hole in it. and it is defiantly a petrol overflow for the carb because it kept leaking on me when I was removing my starter the other day!
I might put a pipe on it taking the fumes away to the back of the camper in the near future or I might go with the nitrous idea I have camping gas and a bit of pipe !!

hope the photo helps Ian.

commer.jpg
 
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