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Tractor Pulling Discussion Forum

Re: case 400 carb

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mEl

12-14-2012 04:41:43
71.241.105.252



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Remove the discharge nozzle and see if there is a jet deep down in the carb, if so remove it, drill the main jet adjustment seat just so the taper will still set on it. Leave the jet out of the passage in the carb. Many do not even have it.
Doug, my carbs for big displacement engines are straight wall venturi but I wouldn't recommend that for stock or near displacement engines. Most will start rite up with no choke. If I want high performance info Motec is my man, Treadwell are great people and do a lot of actual manufacturing of obsolete parts and I use them , but due to Matt's work with big displacement pulling engines and feeding them with stock appearing carbs I feel he has the edge in performance apps. Matt taught me over the fone more than I ever knew about MS carbs, he readily shares info.
mEl
This post was edited by mEl at 04:50:02 12/14/12.

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dboll

12-14-2012 05:26:46
209.23.168.61



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 Re: case 400 carb in reply to mEl, 12-14-2012 04:41:43  
i'm not doubting his abilities and we have discussed this but we pull speed limit often at low rpm's until the load starts coming on and I am a believer on having a correctly sized venturi for throttle response, when I talked to them he pretty much said you didn't need much of one which would be ok at higher rpm's



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mlpankey

12-14-2012 16:05:11
98.68.171.199



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 Re: case 400 carb in reply to dboll, 12-14-2012 05:26:46  
As long as the venturi creates 1 psi of venturi effect its sized correctly no matter the venturis shape.



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