g9m3c Posted November 26, 2008 Share #1 Posted November 26, 2008 (edited) EDITED: Ok, I don't think that's the problem anymore. Something is wrong with my front carb I do think. When I look into it, the suction piston doesn't rise as I give it more throttle, whereas the back one does. Also, it sprays a little gas out through the inlet (choke) side. It runs the same if I take the front 3 plug wires off. What's wrong with my carb? I just rebuilt them both, and they were assembled identically to eachother. Edited November 26, 2008 by g9m3c Link to comment https://www.classiczcars.com/topic/30090-260z-valvetrain-timing/ Share on other sites More sharing options...
g9m3c Posted November 26, 2008 Author Share #2 Posted November 26, 2008 Nevermind, just found a bent valve. :mad: Apparently retards assembled this engine. Link to comment https://www.classiczcars.com/topic/30090-260z-valvetrain-timing/#findComment-267464 Share on other sites More sharing options...
Zs-ondabrain Posted November 27, 2008 Share #3 Posted November 27, 2008 While you're at it, check the oil levels in the front carb versus the back carb. Just do a simple "Lift and drop" test. Link to comment https://www.classiczcars.com/topic/30090-260z-valvetrain-timing/#findComment-267478 Share on other sites More sharing options...
g9m3c Posted November 27, 2008 Author Share #4 Posted November 27, 2008 While you're at it, check the oil levels in the front carb versus the back carb. Just do a simple "Lift and drop" test. Yea I checked that earlier today. I'm taking the entire top end off tomorrow morning. Should be a fun Thanksgiving. Link to comment https://www.classiczcars.com/topic/30090-260z-valvetrain-timing/#findComment-267480 Share on other sites More sharing options...
beandip Posted November 27, 2008 Share #5 Posted November 27, 2008 By chance are you still using flat tops? I don't know what you are referring to by the choke side . SUs draw fuel from the one nozzle/needle assembly in the center of the air stream as the piston lifts. The choke is regulated by lowering the nozzle. Your description is what caught my eye here. If you have the flat tops , when you reassemble the engine I recommend that you install a set of Round Top S Us you will be glad you did. Gary Link to comment https://www.classiczcars.com/topic/30090-260z-valvetrain-timing/#findComment-267485 Share on other sites More sharing options...
g9m3c Posted November 27, 2008 Author Share #6 Posted November 27, 2008 By chance are you still using flat tops? I don't know what you are referring to by the choke side . SUs draw fuel from the one nozzle/needle assembly in the center of the air stream as the piston lifts. The choke is regulated by lowering the nozzle. Your description is what caught my eye here. If you have the flat tops , when you reassemble the engine I recommend that you install a set of Round Top S Us you will be glad you did. GaryYes I'm using flat tops, and yes, it was spraying fuel out through the choke. That's because it has a bent intake valve on cylinder #3. I'm going to guess and hope that you just haven't seen my other threads here and on HybridZ about this car, so you don't know the reasoning behind me using flat tops. This engine will not be in the car very long, because I have an LT1 sitting in my garage that will go in before long. Therefore, I'm just getting this thing going as is for the time being. Link to comment https://www.classiczcars.com/topic/30090-260z-valvetrain-timing/#findComment-267506 Share on other sites More sharing options...
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