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Tractor Pulling Discussion Forum

Re: Blackburn cam

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Josh Blackburn

06-01-2014 16:24:58

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Thanks guys. Glad I could help. Just had a customer give me some Dyno results on one of his projects. Stock stroke 730 gas with .125 over bore, cam and carb I bored for him pulling 79 hp and still not quite rich enough.

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06-01-2014 20:01:44

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 Re: Blackburn cam in reply to Josh Blackburn, 06-01-2014 16:24:58  
I've wondered if opening the tight spot in the Venturi causes enough reduction in velocity/vacuum that it has trouble pulling enough fuel up? A bigger carb would not have this issue because the size difference between the Venturi & throat is still greater, Unless it was severely oversized. Any thoughts?

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north puller

06-01-2014 16:48:10

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 Re: Blackburn cam in reply to Josh Blackburn, 06-01-2014 16:24:58  
What compression ratio? That's an impressive number.

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Josh Blackburn

06-01-2014 17:47:56

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 Re: Blackburn cam in reply to north puller, 06-01-2014 16:48:10  

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