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Tractor Pulling Discussion Forum

Re: Camshaft information

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Author  [Modern View]

12-09-2012 21:51:17

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I would rather not say who built the cam , they done all my work and have been happy just thought the intake valve should b closed be for the piston starts up on compression. I could advance it and give up some on the exaust side but i think that would be better.

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12-10-2012 06:27:42

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 Re: Camshaft information in reply to 1939A, 12-09-2012 21:51:17  
That is why they call it a long duration cam with overlap.
There is supposed to be enough airflow and velocity that the cylinder is still filling during the very early stages of the compression stroke. How many rpm are you hoping for ?

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12-10-2012 15:22:40

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 Re: Camshaft information in reply to Buickanddeere, 12-10-2012 06:27:42  
We are running 10% overstock. Could i retard the if i retard the cam a couple degrees i think the exaust wont be fully closed when it starts the intake side . It runs pretty good just trying to get a little more out of it. Thanks for all the help

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12-11-2012 09:22:24

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 Re: Camshaft information in reply to 1939A, 12-10-2012 15:22:40  
Retarding the cam reduces low rpm lug and increases peak rpm power. You want to run the cam moderatly advanced to increase low end torque.

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north puller

12-10-2012 18:41:13

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 Re: Camshaft information in reply to 1939A, 12-10-2012 15:22:40  
My 70 cam is timmed at 108. I run 10% over stock also. I would see if you could advance the cam a bit more - say 105 or 106.

My grind has 105 LSA. Engine works good, but could use a little more lug. I don't think that 112 LSA is going to give you what you want.

May want to consider something different. Josh Blackburn or Gary Baker can give you a better cam grind. Rumor is that they worked together developing a cam grind for A/60's.

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rumor has it

12-10-2012 18:48:12

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 Re: Camshaft information in reply to north puller, 12-10-2012 18:41:13  
Speaking of rumors, didn't this motor come from josh?

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12-10-2012 19:37:20

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 Re: Camshaft information in reply to rumor has it, 12-10-2012 18:48:12  
No this motor did not come from josh i wasnt aware of him when i built this motor from the things i have seen and learned he appears to knowwhat he is talking about. When i get my A together im going to work on my little boys G and i will talk with him. Thanks to all that have giving me advice im still learning

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