Mark Maras

Actually Jalex reported some progress. In post #283, in his last performance description. He said that the car was running better than before, albeit at 3 1/2 turns. That tells me the float (fuel) level needs to go up another mm and recheck the nozzles at 2 1/2 turns.

All I can gather from this is the fuel level isn't critical, which I know is BS. In group A, we have the 23 mm fuel level with the nozzles at 2 1/2 mm, leaving the fuel level FAR below the nozzle top. In group B, we have the 1/16" below the nozzle top at 2 1/2 turns. Both groups say they have had success using these settings. I have no explanation for group A's float setting. @jalexquijano, Keep raising your floats to 1/16" below the top of the nozzle at 2 1/2 turns down.

I agree, unfortunately I don't have the computer skills to do that.

@240260280 I read Brian's write-up on setting floats 10 turns down, 23 mm fuel level. All seems good until you read his opening paragraph under "Setting SU Float Bowl Levels". He says 2 1/2 turns down is the proper setting. Note in his instructions that he doesn't return his mixture screws to 2 1/2 turns. It can't be both ways.

I put a dab of red RTV on those spots that are prone to leakage.

Found it. '72 SU Float Level 2/20/12. "When all is said and done and the nozzles are where ya like' em, the fuel level as viewed down in the nozzle should be about a 1/16 of an inch below the top of the nozzle. Puddling up on top of the nozzle, things'll get fat and contrary to that if the fuel level is too far down the nozzle things'll be lean." That statement comes from Bruce Palmer. If "where ya like'em" is 2 1/2 turns the fuel level should be 1/16" or so below the top of the nozzle. There's no way, IMO, that the fuel level is supposed to be 10 turns down UNLESS the 10 turns down (23 mm) fuel level is with the float removed. The fuel level raises 7 1/2 turns when the float is installed putting it at 2 1/2 turns down. Anyone?

@rossiz You rebuilt your carbs a few years ago and your Z runs great. Where is your fuel level?

That's not another worm in the can. I use that method to set needles too. Another worm in the can is when we start pulling the SM needles out of the pistons a bit to clean up the idle. But that worm is down the road.

@Bruce Palmer @240260280 @jalexquijano and all others who are interested. Hopefully we can get to the bottom of this. My experience with SU's for a few decades was with 4 screw carbs. When I set my floats using the 9/16" method, the fuel level turned out to be a bit below the nozzles at 2 1/2 turns, although checking the fuel height in the nozzles was more out of curiosity back then. Decades later, someone quoted Bruce saying the fuel level in the nozzles was supposed to be slightly below the nozzle top at 2 1/2 turns. I had no problem whatsoever over the years with my SU's and that confirmed my findings from years ago. I was convinced that the 1/16" at 2 1/2 turns was correct. I'm still pretty sure that's correct but I'd like to erase the little bit of doubt I have. I don't give a damn if I'm right. The import thing is to figure this out so we all understand it.

Yeah, I could spend an hour or two pulling parts on that one.

As long as the studs are in place and the interior is clean, try more heat, Propane torch might be enough for sheet metal, oxy-acetylene would be quicker. If you get it hot enough, it will move.

Perfect. We're getting close.

Spotted something else. The X patterned tunnel and shock tower material looksto be reusable. I don't see any rips. I remember a few people who were trying to find the original covering.

Wrong. The fuel level should be around 1/16" below the little hole in the nozzle(nozzle top). The fuel should not puddle on top of the nozzle. The 1/16" fuel level below the nozzle top is so we can lower the nozzles to 3 or even 3 1/2 turns if we need to and the fuel won't be puddling on the nozzle tops. The 1/16" gives us room for fine tune adjustments.

Oliver is checking his stash to see if he can help.

A pic isn't going to be as good as you looking at your own nozzles at 2 1/2 turns. If you're not sure which part of the nozzle assembly we're talking about, pull the domes and pistons. Adjust the mixture screw all the way down (clockwise) while looking down into the carb from the top. You'll see the center part, with the hole in it, drop as you turn the mixture screw. I suggest that you keep adjusting the nozzles down until you see fuel pool on top of the nozzle. That should help show how high the float fuel level needs to be raised. Turn the mixture screws back to 2 1/2 turns down and keep adjusting the floats until the fuel level is 1/16" below the top of the nozzles. You're getting there. At this rate you'll beat Cliff. His floats took three months.

Yeah, inclined is what I remember. You can check the level at 3 1/2 turns but remember the level is supposed to be at 2 1/2 turns. If you're having trouble seeing the fuel level at 2 1/2 turns, pull the choke. That will pull the nozzles down and you will be able to see how low the fuel level is and hopefully, how far it has to come up.

Thanks

What's the name of Oliver's business in Marysville?

Being able to grab something with a handle made it much less tiring and allowed a better angle adjustment. If you try it, safety goggles are a must. The tiny paint chips fly off in a cloud.

How about castellated. Similar to wheel bearing nuts.

@Terrapin Z You might want to go back and get the radio and the face plate. It looks like the original AM FM unit. Oh yeah, the antenna too. I was in Puyallup last weekend. If I'd know that Z was close, I wouldn't have made it to my brother's party.

I found that a H.F. wood chisel worked great and was a lot easier to grip than a razor blade. Used it to remove the PO's flat black spray can paint job.

Jalex. We're "getting there". I'll bet you're starting to feel a sense of accomplishment. You may even have a stupid grin on your face that can't be erased. VOE. Soon you'll be giving your former mechanics a single digit salute as you drive by their shops, revving the engine to 5000 + RPMs. Keep up the good work.

Congratulations, we're getting close. Keep in mind the goal is NOT to get it to run well at 2 1/2 turns. The goal is to get the floats set to 2 1/2 turns THEN adjust the mixture screws to fine tune it. The float level at 2 1/2 turns down (clockwise) is the primary mixture adjustment. We've got to get the floats right before we can fine tune.