changed float valve and now have exhaust pop

audiocontr · Post by **audiocontr** » Sun Jul 26, 2009 4:00 pm

I've noticed that i have a bog at initial take off and a slight pop in the exhaust while coasting ever since swapping out a bad float valve. I've also noticed a slight loss of power.

The float valve that was in it before had a 175 marked on it. The new has 200. What do those numbers represent? I used the same spacer with the new valve.

Could not having the carbs sync'd properly cause this?

Jim LaGuardia · Post by **Jim LaGuardia** » Sun Jul 26, 2009 5:18 pm

That 200 is the wrong valve, you must use the 175 for the 36 mm Zenith. The 200 is for porsch 356 and Unimog 32mm Zenith carbs

In other words, your float level is too low

Too low = LEAN

audiocontr · Post by **audiocontr** » Sun Jul 26, 2009 5:27 pm

uhh ohh. I blame Scott at EI for this one!!

I'll give him a call tomorrow

Thanks Jim

ExpeditionImports · Post by **ExpeditionImports** » Sun Jul 26, 2009 7:45 pm

No, No, No.........

The needle valves are marked 200, 175, 150, 140. That represents the size of the center hole in the valve. Example, 200 is a 2MM hole in the needle valve. 175 is a 1.75mm hole in the needle valve, etc. This is a flow issue.....The larger the hole in the center of the needle valve the more flow the needle valve will allow.

The Porsche units run a 150 or 140 and hence have caused many a heartache for the Pinzgauer owner who thinks they are getting a great deal on a 356 kit. Usually the difference is that they will be starving for fuel at higher RPM's. The oposite is true of a 200 (2.0MM) needle valve. This valve will allow GREATER fuel flow into the bowl, not less fuel flow.

The 200 valve is a much higher quality valve than the crap that has been coming out of Switzerland/Austria. They are NOS Mercedes Benz and don't even compare to the single body stamped type valves being produced know. There are absolutely ZERO negative effects of installing a needle valve that will allow higher flow, there are definitely negative effects going the other way.

Take your 200 valve and look down the center. Compare it to your 175. You will notice a slightly larger hole.

Your issues are unrelated to the 175/200 valve difference. However, you have installed a new valve, have you set the float level? Anytime a new valve is installed the float level must be set.

Cheers,

Scott

Jim LaGuardia · Post by **Jim LaGuardia** » Sun Jul 26, 2009 10:18 pm

Sorry, my mistake

I had found some longer needle valves in the past that had similar markings.

audiocontr · Post by **audiocontr** » Mon Jul 27, 2009 5:45 am

What? Wait, Jim... you were incorrect?

I now remove the blame from Scott and place it on you.

Thanks guys. I will check the float level again

Jim LaGuardia · Post by **Jim LaGuardia** » Mon Jul 27, 2009 1:56 pm

You must also syncronize both carbs.