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pressure fitting location on pipe

Old 08-01-2007, 10:41 PM
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CMichaelS
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Default pressure fitting location on pipe

This MAC 3.5 pipe that I bought for my OS .18 CVR doesn't have a pressure fitting for the fuel line. I was told to drill in the widest part of the pipe...
From the looks of it, the pipe has a max diameter for a good 4 or 5inches.. so within that range, where should it go?

I also measured from the glow plug around the header and to the widest part of the pipe (the begining of the widest part) was like 10inches.. now what do you think the difference would be if i were to cut say an inch or two off the pipe to make it 9'' or 8''?
Old 08-02-2007, 12:05 AM
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Ron Olson
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Default RE: pressure fitting location on pipe

Most people drill the hole for the fuel pressure fitting either just aheasd of or at the widest part of the pipe know technically as the convergent/divergent cones. I use the small pressure fitting from Du-Bro for most of my boats.
Shortening the pipe is normal as they come a little long from the manufacturer. A pipe or tubing cutter makes the best looking cuts but a hacksaw or a Dremel with a good cut-off wheel can do the job also. Try it at about 8-1/2" from the plug to the fat part of the pipe where it begins. I have an idea that you bought the muffled pipe.
Old 08-02-2007, 12:33 AM
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CMichaelS
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Default RE: pressure fitting location on pipe

i dont know if it's muffled or not.. but there isnt anything at all in the insides.. but i guess the design could make it muffled?
Old 08-02-2007, 12:45 AM
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Default RE: pressure fitting location on pipe

This picture might help you out a little. Look closely and you can see where the pressure fitting is, it's on the bottom side of the pipe. This is a Mac 2.5 unmuffled pipe but it does have an aftermarket muffler attached in this shot. The muffled Mac 3.5 pipe will be much longer.
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Old 08-02-2007, 01:02 AM
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Sean Bowf
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Default RE: pressure fitting location on pipe

Maybe I am missing something, but I always try to put the pressure nipple any place BUT the bottom of the pipe. My fear is that the unburnt oil will get blown into my fuel tank if I put the nipple on the bottom. I agree with the other inputs you got on the location...so nothing to add there.

Ron, where can I get a silencer like that?

Sean
Old 08-02-2007, 08:01 AM
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Ron Olson
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Default RE: pressure fitting location on pipe

I got that from David Preusse at www.cdrace1.com . It's not on his site yet.
You might have trouble contacting him this week as he, his wife and father are all at the IMPBA Internat's. He custom makes each one depending on what pipe that you're using so he'll need the OD of your stinger.
Old 08-02-2007, 09:22 AM
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Default RE: pressure fitting location on pipe

Ron, do you shorten the pipe as well or do you mean just the header. I wouldn't mind taking my 13cc pipe down 1/2 an inch +.

Ryan
Old 08-02-2007, 06:42 PM
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gooycheese
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Default RE: pressure fitting location on pipe

I usually shorten my pipes, I havent shortend a header yet.


Paul


I agree with Sean, I wont put my nipple facing down affraid I will get oil sucked in to my fuel tank.
Old 08-03-2007, 07:37 AM
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Default RE: pressure fitting location on pipe

Really? Well, I guess it all depends on if you have enough header to cut, otherwise the pipe must be cut. I've always cut the header but it should not make any difference.

Ryan
Old 08-03-2007, 09:13 AM
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Ron Olson
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Default RE: pressure fitting location on pipe

I've only shortened the headers only when they needed to be but otherwise I like to leave them alone
Old 08-04-2007, 06:38 PM
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Default RE: pressure fitting location on pipe

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