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Title: Chinese 40 idf carbs!! Post by: fastoldvw on July 08, 2015, 08:14:21 am Hi, I just went and bought a set of Chinese 40mm idf "no brand" carbs for my torque built oxyboxer 2276cc engine.
I am now in the process of changing the jets/venturi's as the ones delivered were not the size i need and the venturi's were very rough looking. I'm machining the venturis to 32mm and upping the jet sizes as per Bob Tomlinson ;-) I know that i need to check float height and port the inlet a little Question is: what else should i be checking on these carbs? Anyone running these with succes? Thanks Rune Title: Re: Chinese 40 idf carbs!! Post by: Phil West on July 08, 2015, 17:52:02 pm Check any remaining jets (pump, idle, etc.) with a jet gauge to be sure they measure at what they say are. Check for any flashing and blocked jets. Check float hinge pin to ensure it will remain secure.
As per: http://cal-look.no/lounge/index.php/topic,12904.0.html Cheers Phil Title: Re: Chinese 40 idf carbs!! Post by: alex d on July 08, 2015, 17:55:09 pm I would take the jetting charts in the bob tomlinson book with a grain of salt
Title: Re: Chinese 40 idf carbs!! Post by: fastoldvw on July 08, 2015, 18:04:02 pm Yeah, i've been informed that bob's charts might not be the best place to look, so maybe someone here can get me a rough estimate on jetting these 40's?
Engine is 82x94 2276, 5.6" rods, Engle 120 cam stock rockers, 40/35,5 heads, 9:1 comp. It will sit in a baywindow Crewcab, and will not see more than 6500ish rpm. The venturi's are now 32mm Title: Re: Chinese 40 idf carbs!! Post by: Jim Ratto on July 08, 2015, 18:30:46 pm Yeah, i've been informed that bob's charts might not be the best place to look, so maybe someone here can get me a rough estimate on jetting these 40's? Engine is 82x94 2276, 5.6" rods, Engle 120 cam stock rockers, 40/35,5 heads, 9:1 comp. It will sit in a baywindow Crewcab, and will not see more than 6500ish rpm. The venturi's are now 32mm 32mm chokes in that size motor will allow usable power to 5300 rpm. I would use a 55 idle F2 emulsion tube 135 main 185 air corrector closed accelerator bypass Sincerely, Jim Title: Re: Chinese 40 idf carbs!! Post by: RMS Boxer Service on July 09, 2015, 14:05:33 pm Deburring deburring cleaning cleaning and genuine Weber jets E-tubes then you have a chance :)
/Rolf |