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Tractor Pulling Discussion Forum

Blackburn cam

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jpick87

06-01-2014 12:11:08
64.33.200.252



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I put one of Josh's cams in my A and man that thing pulls better now. It's a completely different beast now. I've only got 4 passes with the new cam but it's running really strong. Price was reasonable turn around was quick and Josh is super nice to talk to. Just thought I would pass along some good feedback for everyone.
Thanks a million Josh!




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Gtx1967jewison

06-01-2014 20:09:50
66.97.232.42



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 Re: Blackburn cam in reply to jpick87, 06-01-2014 12:11:08  
We have a stock stroke 5" B with his cam that pulls real hard on the top end. I just finished a stock stroke 4.69" B with the same compression & valve size, & a "puller" cam grind from another shop that does not pull nearly as hard. They both idle real nice. There are a few other differences, but those may get eliminated soon. It carries the front in 2nd gear for about 50', in 6500# class, with 750# 11 feet ahead of the axle. It's 220 cubes.

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Gtx1967jewison

06-01-2014 20:11:39
66.97.232.42



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 Re: Blackburn cam in reply to Gtx1967jewison, 06-01-2014 20:09:50  
52hp on the crankshaft, on a belt driven Prony Brake that is dead accurate.



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Josh Blackburn

06-01-2014 16:24:58
70.194.2.226



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 Re: Blackburn cam in reply to jpick87, 06-01-2014 12:11:08  
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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Gtx1967jewison

06-01-2014 20:01:44
66.97.232.42



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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
207.219.69.197



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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
70.194.2.226



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 Re: Blackburn cam in reply to north puller, 06-01-2014 16:48:10  
10.5



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Bill Riechmann

06-01-2014 12:38:41
208.70.36.7



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 Re: Blackburn cam in reply to jpick87, 06-01-2014 12:11:08  
Josh did my cam and carb on a 49 JD G. Great results!



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2 Cylinder

06-01-2014 17:16:52
66.87.74.235



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 Re: Blackburn cam in reply to Bill Riechmann, 06-01-2014 12:38:41  
What were the numbers on the G? And is it stock stroke? What bore size? I have a fairly stock 67 hp G. No stroking, flat head, aluminum high compression .090 over. How much could I gain with a cam setup?



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Josh Blackburn

06-02-2014 08:54:28
70.210.67.250



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 Re: Blackburn cam in reply to 2 Cylinder, 06-01-2014 17:16:52  
Cam and carb work would be worth. 8-10 hp.



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2 Cylinder

06-02-2014 14:27:34
66.87.93.32



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 Re: Blackburn cam in reply to Josh Blackburn, 06-02-2014 08:54:28  
What kind of price for the cam & carb work Josh?



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Josh Blackburn

06-02-2014 14:28:27
70.194.0.194



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 Re: Blackburn cam in reply to 2 Cylinder, 06-02-2014 14:27:34  
9892775366



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Early B

06-02-2014 09:31:34
67.142.181.26



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 Re: Blackburn cam in reply to Josh Blackburn, 06-02-2014 08:54:28  
Hey Josh, should i tell them what my little B that you built is putting out on the dyno? lol I did find a few more horses playing w/the carb since we last spoke.



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Gtx1967jewison

06-02-2014 18:42:14
66.97.232.42



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 Re: Blackburn cam in reply to Early B, 06-02-2014 09:31:34  
Did you stroke it?



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Early B

06-02-2014 19:41:55
70.192.17.33



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 Re: Blackburn cam in reply to Gtx1967jewison, 06-02-2014 18:42:14  
Yes i have a little stroke. 52 hp at the crank, what you figer that should be at the pto for hp?



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Gtx1967jewison

06-03-2014 17:59:38
70.197.200.13



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 Re: Blackburn cam in reply to Early B, 06-02-2014 19:41:55  
Should only be about 3 hp less, but I would not try it because it will break the pto



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Early B

06-03-2014 19:23:25
70.192.10.189



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 Re: Blackburn cam in reply to Gtx1967jewison, 06-03-2014 17:59:38  
I wouldnt worrey about it brakeing @ 52 hp.



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Gtx1967jewison

06-05-2014 14:34:49
70.198.38.235



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 Re: Blackburn cam in reply to Early B, 06-03-2014 19:23:25  
Lots of bone stock ones have broke. When it goes you end up with a hole in the bottom of the Trans case.



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