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OZ001

SU Carb problem

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my 240z is running abit rich and its getting me nauseous when im driving any help on getting this tuned?? do i adjust the knob on the SU's? this is my first carby engine :P

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I think it's been blabbed about before but try rotating those knurled knobs under the carbs in and then (I think) 2.5 turns out as a starting point. Then if you have access to a carby balancer, balance them! Check your plugs first to see what colour they are.

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If you want to learn everything you can about SU's, order the video from Z Therapy in the states (you can get it direct from them or through black dragon auto). Well worth the money. It will teach you how to pull apart, maintain and tune them. Steve and I have the video, a carb sync tool and the colortune spark plug thing and between all of that we can get the car running pretty nicely.

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I have a massive thread relating to working on my carbs, hopefully you can get some information about tuning them from it.

 

Good luck

 

Steve

 

linky: http://www.viczcar.com/forum/index.php/topic,3493.45.html

 

edit, shaun just beat me to the punch, that video was bloody useful. the reason i struggled so much with my carbs was that the tappets needed adjustment so it ended up not being a carb problem.

 

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It may be float needle and seat. If they are worn/shagged, they will let excess fuel in to the carby. Only way is to strip and check.

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can i get a copy of the video???  :P

 

Kinda stuffing around his business if we start handing out copies of the video.  :-\

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hooold on... a few questions.

is the car actually running ok when you drive it ?

your assuming your getting nauseous because of the carbs, but it could be the carbs are sorta ok, but the residual gasses are entering the cabin thru the usual gaps..

SU's will always emit a little bit of vapour...

check that the fuel tank breather hose (which runs parallel to the tank inlet hose) hasnt separated from the tank,  its a common problem when the grommet shrinks and carrodes...if it has, block up the gap with some silicon to stop the fumes from entering the cabin..

 

 

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Would a car be using too much fuel if this fuel tank breather hose was to be unblocked? What if it was blocked?

 

I found that when I blocked mine up that the pressure got very low and there was a significant 'whoosh' of air flowing into the fuel tank when i opened the filler cap. I couldn't figure out if fuel in tank being at lower pressure would affect the cars consumption since when it gets to the SUs it is at atmospheric pressure.

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problem fixed (THANKS GUYS) it was the oil catch can going atmo which causes me to get all nauseous. just gotta re-route it. the carby are fine. lucky i work next to ian cummins who specialises in classic cars and i mean classics and restorations.. you gotta see his show room its awesome. guess ill be taking my car there for some rust removal.

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