Hey, Bruce, are these the right size of Grose jet for the Z SUs?

http://www.minimania.com/web/Item/AUD9096GR/InvDetail.cfm

Also, how does MSA get the Grose jets for their remanufacuted SUs?

http://www.thezstore.com/page/TZS/PROD/11-3001

Duffman,

The orifice size and threading are different on the HS Model Su's and will not fit the Z SU's.

I don't know why MSA keeps advertising Grose jets in their rebuild section. At one time I called MSA and they said they no longer can get Grose Jets.

Also, I believe that Z therapy is the company that rebuilds the carbs for MSA...so Bruce would know.

Here's some of the information I have been able to dig up over the years about Grose jets:

The Grose Jets were made by D & G Valve:

8 Mt Vernon St.

Stoneham, MA 2180

(781) 438-1789.

However no one answers the phone or returns inquiries by mail (As of 2008)

I did read a 510 newsletter that stated BTR Engineering in Australia has acquired the patents to the SU's and is producing the carburetors and parts. Unless things have changed since I emailed them (2008) they handled all the SU's EXCEPT for the Z Cars.

Also, some have had problems with Grose jets sticking too and went back to using the stock parts.

Hope this helps.

Dave Ruiz

Thanks,. Dave, I thought Z Therapy did the remanufactured MSA carbs. Sad to hear that they are not available, would like to try them out!

MSA is about as poficient at getting out of date info off their web site as we are and I say that only if they still reference Grose Jets. I haven't looked at their web site in a long time..... hell, I haven't looked at our web site in a long time.....

I would be really surprised if any patents are still in place that would preclude anyone from producing and selling an on/off valve of the Grose Jet variety. They first came out in the 50's. Anyone here proficient in patent law?

I looked up BTR Engineering and they no longer list a web site.

What little I do know about patents is BTR can buy the rights. They would also have to pay the yearly maintenance fees. Both of which are not inexpensive.

If you're really dying to find out, there is a patent attorney who is also a Z enthusiast by the name of Gary Baker at either zhome.com or AtlanticZcarclub who I'm sure would know.

Maybe the Chinese will manufacture them. . . they really abide by patent law! Sorry...I digress.

Another question is: who makes the Grose jets that are currently being sold for the mini's and MG's ?

Duffman

If it makes you feel any better, yes, the Grose jets are a neat item but the stock jets work just fine. So if you can get past the outdated website at ZTherapy , give Bruce a call.

Dave Ruiz

So, Did the man cure his leaky carb?

Also, some have had problems with Grose jets sticking too and went back to using the stock parts.

My stuck valve was a Grose jet. It happened after the car was sitting for a year so I cleaned it and still run the Grose jet. That was about 10 years ago and no other incidents.

Just to get this thread back onto the ORIGINAL question, when you take the top off the carby, look for any tiny black bits in the bottom of the bowl. If the rubber fuel lines are as old as the car, the inside of the hoses could be breaking down.

Happened to me with the rear carby. New fuel lines fixed the problem.

Rick.

I adjusted the float, and everything seems to be running fine so far, i have not been able to really work on it the past few days thanks for all the help!

on a side note, would bad/ torn gaskets be the cause of my 3000rpm idle when mix is lean and idle is set to full low?

Tim

on a side note, would bad/ torn gaskets be the cause of my 3000rpm idle when mix is lean and idle is set to full low?

No. Is your fast idle screw out at all? That should be fully retracted after the fast balance is set.

Gentlemen, i had the same problem car shutting off what i first diid was take the gas tank out and notice it was rusted and sending particles to the fuel pump. so i dumped the old gas tank and replaced it whith a refurbish one problem solved.