SU Float Level and Engine Angle

[Mark Fraser]

I am trying to get the float level set correctly on my SU carbs but just can’t make them workout. I want both carb levels to be the same height down from the bridge. My front float level is about the right height but the rear one is about 1/4†lower that is should be. If I bend the tab to raise the level, the float hits the float chamber side and fuel spills over the top. I have even tried drilling a new pivot point higher in the float chamber but that has not worked either. One possible cause of this height difference is my engine sits at a 3 degree angle with the front being higher than the rear. Should a Z engine sit level in the engine bay? Thanks for any help on this.

 

Mark

[steve260z]

I'm sure your engine is fine. That's not your your issue. Its been a while since I adjusted the float levels. I'll let someone else comment on that.

ss

[madkaw]

Certain years actaully had two different float level settings, the front being different from the year. Might have better luck searching SU carb float settings on Google.

[steve260z]

What do you mean by "If I bend the tab to raise the level, the float hits the float chamber side"?

 

To hit the side, you mean the float is not traveling straight up?

 

I assume you've already looked the stuff up, if not:

 

http://www.jetlink.net/~okayfine/su/sutech.html#anchor108396

http://www.jetlink.net/~okayfine/su/moreinfo.html

ss

Edited March 10, 2012 by steve260z

[jasper]

http://forums.hybridz.org/index.php/topic/91432-su-identification-parts-wanted/page__p__865408__fromsearch__1#entry865408

[Mark Fraser]

Thanks for the links to other posts. I ended up making a few shims to place between the lid and the float bowl. I now have both fuel level the same distance down from the carb bridge. On to the next step of the tune up.

[steve260z]

Jasper,

 

Thanks for the link to the link. Never seen those TBs before.

ss