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Rob Mix Carbureters

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3.2K views 1 reply 2 participants last post by  70BossRanchero  
#1 ·
Hey Fellas,
anyone have experience with Rob Mix E85 carburetors? I've had a 750 DP built by him for about 5 months now, and for my life can't get it dialed in.

I see several guys on other forums have experienced issues with his carbs, and it seems to be a common issue.

I haven't learned enough about this fuel to be real specific yet, but some of his carb specs vary greatly from what most guys are using. Certain things stand out like: extremely large jetting, undersized PVCR's, larger than normal air bleeds, small booster bin size, small idle feed restrictors, etc. All E85 specific, or course.

I can tell you what the car is doing, but for now I am curious to know if anyone else has had any issues with his carbs, and has been able to make them work (noting the common unusual specs mentioned above) with there combo.

Thanks
 
#2 ·
Since E85 requires more fuel to mix with the same amount of air vs pump gas, then having smaller than normal idle feed restrictors would require the idle mixture screws to be turned out excessively, and would probably create a lean stumble on tip in till the main jets come on.

I don't have any personal experience with his carbs, just lots of experience jetting carbs.

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