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 Post subject: pump cam/check valve
 Post Posted: Tue Jul 10, 2012 7:56 pm 
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Joined: Wed Apr 19, 2006 8:20 pm
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Location: N.J.
Here's the pump cam that was on my 1150 that gave me a clean and lean leave..Have to say thanks to Bill S. with this idea and help it made a big difference..So I am going to try the stock yellow cam with the E85 and see how it does and swap them out with the modified ones..

If that don't work or even if it does I drilled for a bleed in the pump shot and have 2 of each .010,.015 and .020 bleeds to try..
What do you guys think??
I can tell it's not to clean on the hit with the E85 so I am going to try to clean it up but not until I get the MJ close as I think Im still rich with thw 176 jet...
Hope to see this Sunday =; ..

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running E85
Best ET 8.07
Best MPH 170.71
Barry


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 Post subject: Re: pump cam/check valve
 Post Posted: Tue Jul 10, 2012 8:27 pm 
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Joined: Mon Oct 29, 2007 7:07 pm
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Location: Florida
E85 needs more accelerator pump shot than gas, you may be able to grind a little off but it just depends on the engine.


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 Post subject: Re: pump cam/check valve
 Post Posted: Wed Jul 11, 2012 8:50 am 
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Joined: Fri Feb 17, 2012 8:09 pm
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Location: Maryland
The cam is filed to give less fuel, right? Could the 4150 cams be bored to the 4500 shaft size in order to so the same thing?


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 Post subject: Re: pump cam/check valve
 Post Posted: Wed Jul 11, 2012 10:21 am 
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Ron Gusack wrote:
The cam is filed to give less fuel, right? Could the 4150 cams be bored to the 4500 shaft size in order to so the same thing?


Yeah, jmarkaudio had mentioned doing just that either up the page or on another thread. So yeah, that's being considered. ;-)

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Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

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 Post subject: Re: pump cam/check valve
 Post Posted: Wed Jul 11, 2012 5:54 pm 
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Joined: Mon Oct 29, 2007 7:07 pm
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Location: Florida
The white Dominator cams are just that, I just need to make a fixture to hold the cam so the mill doesn't yank it out.


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 Post subject: Re: pump cam/check valve
 Post Posted: Thu Jul 12, 2012 5:50 am 
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Joined: Sun Nov 11, 2007 10:33 am
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Location: Montgomery, Alabama
You guys are lucky that you have good T slots. I have to use a ton of pump shot to get the stumble out because of over exposed T slots.
I'm at a .044 nozzle. O:)


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 Post subject: Re: pump cam/check valve
 Post Posted: Tue Jul 17, 2012 12:26 pm 
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Joined: Fri Feb 17, 2012 8:09 pm
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Location: Maryland
I'm going to try to bore the cam hole with a 4 flute, 1/2 inch end mill and hope the little 4-40 screws hold the cam secure enough. Would you advise spinning the mill at a high or low speed. I'm thinking the faster the better. Mine is a move the belt deal, so I'm limited to certain speeds.


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 Post subject: Re: pump cam/check valve
 Post Posted: Tue Jul 17, 2012 7:39 pm 
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Joined: Wed Oct 24, 2007 6:36 pm
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Location: Blanco, Texas
Faster with slow feed works better with plastic, less tendency to grab. Not so fast that it wants to melt obviously. =;

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 Post subject: Re: pump cam/check valve
 Post Posted: Wed Jul 18, 2012 12:56 pm 
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Joined: Fri Feb 17, 2012 8:09 pm
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Location: Maryland
This was really easy. I just have to round up some cams and do some testing. I'm willing to do some for you guys if you want. PM me and I'll give you an address.
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