Does the gros-jet valve replace the float in a carb as well as the needle and seat. Also do they work ok. Seems years ago i heard swomething on a problem with gros-jet valve sticking shut. I am not familiar with them, are they any good? Thanks, Dennis
Dennis; If that's the needle valve that uses ball bearings as a replacement for the needle, I had problems with that one. I purchased a new NH rebuilt that had one in it. Almost every time out, and many times after just starting, I would run out of gas. Very embarasing and dangerous.
Put in a used all metal one that was in the box of parts that came with the truck and haven't had a problem since.
I've had gros-jets in both of my Model A's and both Model T's for at least 15 years. They have been problem free for me (no sticking or leaking). I can't speak for the ones being manufactured today.
I used gros-jets in my MG-A in the late 1950s and early 1960s with no problems. They were much better that the original valves that must have been copied from the Model T. They have been around long enough for the patent to expire, as did the original Model T (or at least recent) maker in Massachusetts.
Anyone can make them now and others apparently do make them. Not everyone agrees with my opinion on the value of these valves. Like every other aspect or part of a Model T, you always have at least two opinions and must form one of your own!
You can have a problem with a gros-jet if your gas tank has trash in it. I had one problem in 28 years. A very small piece of the felt gas line seal ended up lodged in the small ball area. The valve worked fine again after that piece was found and removed.
I have 1 that I put in the carb I fixed up real nice for my project.It was the first thing I took out when trying to fiqure out what was wrong when the engine didnt do right.
I installed another old carb that i didnt do anything but blow out with a air hose,seat the needle with some of that time saver compound and installed it.Been driveing it since.
While I dont actually use the gross jet,I must say,I dont really see the improvement it could make.Maby I am just a little uneducated on them.Maby someone can take a moment to go over the details.
I wonder what the answer to Dennis' initial question is: "Does the gros-jet valve replace the float in a carb as well as the needle and seat".
OK, NO, the gros-jet only replaces the valve and seat and must still be actuated by the float level, which will change with the gros-jet installation. The gros-jet will not work properly, if the float level is not properly adjusted, after installation of the gros-jet.
The float level must be checked or adjusted any time the valve is changed. The valve type is not important to the need for adjustment. The need for a float adjustment may have been the only original carb problem.
Thanks James. So there needs to be a connection between the float and the Grose-Jet (which I don't have)?
There is a "little tab" on the float that pushes against the old needle so as it goes into the seat and plug the incoming gas hole. The Grose-jet replaces the needle and seat. The little tab on the float pushes up on the ball of the Grose Jet which plugs the incoming gas hole.
(Did I say gashole?)
On a personal note, I used a Grose-jet on a Holley G and did not like it. I found a replacement needle and was satisfied.
There is a Viton tipped needle for the NH that I have been very happy with. You can use it in a Holley G too, just put in a piece of brass tubing to make it fit the inside "well" of the seat.
That Holley G gros-jet shown will not work in the more common Holley NH carb.
If I could find the one I removed from my 16 you could have it. Never ever again.
Keith, thanks for the interesting info that the Holley NH needle and seat can be easily adapted for use in the Holley G.
My question is why doesn't someone make a needle and seat exactly like Holley did? The ones they make today are .023" too small, and cause the car to starve for gas on a hard pull. Another thing we need is the carburetor tool to get them out.