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Old 02-16-2012, 11:35 AM   #1
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Default What is this???

i was looking at pics on neobuggy from this years montipellier and i came across this picture of mayfields buggy. what is he using on his pressure line?? is it a one-way vavle?? If so why
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Old 02-16-2012, 11:50 AM   #2
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My old eyes can't see it on that image, but there are generally two items that some people use on their pressure lines:

1. Exhaust cooler -- an aluminum or steel heatsink (that looks like a fuel filter) which in theory cools the hot exhaust before it gets to the fuel tank. Hot exhaust = hot fuel = worse fuel economy. Some people also used to use a fuel filter without the filter element for this purpose

2. Pressure valve -- Orion introduced one of these a few years ago -- not sure if there are more on the market now. It basically helps maintain the pressure in the tank, even when the car is upside down.
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Old 02-16-2012, 01:11 PM   #3
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That gold color piece near the tank cap?
It looks like a fuel line coupling adapter, maybe it has a smaller hole to lower down the pressure. I have played with lowering the pressure and must say that you can make some improvements with that.
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Old 02-16-2012, 01:39 PM   #4
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Here are some links to bigger pictures.

http://gallery.neobuggy.net/2012Race.../O/DNC0177.jpg

http://gallery.neobuggy.net/2012Race.../O/DNC0182.jpg
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Old 02-16-2012, 02:32 PM   #5
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Zooming in on the 1st pic I would say I am right. With setting my IE zoom on 400% I do see a smaller hole in the coupling piece.
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Old 02-17-2012, 07:54 AM   #6
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ok so i have heard of using valves to increase pressure and have heard nothing but bad things but i have to admit i have never heard of lowering your pressure . what are the benefits?
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Old 02-17-2012, 08:08 AM   #7
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Very interesting....

Completely unrelated: when did Mayfield start running the LRP engine instead of the Reedy engine?
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Old 02-17-2012, 09:46 AM   #8
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Quote:
Originally Posted by ehartman_49348 View Post
Very interesting....

Completely unrelated: when did Mayfield start running the LRP engine instead of the Reedy engine?
I'm pretty sure last year at the ams was the first time
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Old 02-17-2012, 10:08 AM   #9
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Quote:
Originally Posted by ehartman_49348 View Post
Very interesting....

Completely unrelated: when did Mayfield start running the LRP engine instead of the Reedy engine?
Nats at thunder alley Was the first race
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Old 02-17-2012, 04:34 PM   #10
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Quote:
Originally Posted by nitrozilla View Post
ok so i have heard of using valves to increase pressure and have heard nothing but bad things but i have to admit i have never heard of lowering your pressure . what are the benefits?
The engine will be less pressure sensitive. Going back from top rpm to idle in a normal situation will still give a pressure boost resulting in a rich bottom end when giving throttle again. Trying to lean out can give other problems.
Lowering pressure will fiter out those boosts giving a less rich bottom end without going to lean.
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Old 02-18-2012, 11:58 AM   #11
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Originally Posted by Roelof View Post
The engine will be less pressure sensitive. Going back from top rpm to idle in a normal situation will still give a pressure boost resulting in a rich bottom end when giving throttle again. Trying to lean out can give other problems.
Lowering pressure will fiter out those boosts giving a less rich bottom end without going to lean.
What's the exact part and where can you buy it? I would like to experiment with this a little bit to see how it really behaves....
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Old 02-18-2012, 01:16 PM   #12
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Ik do not know what parts, such things can smple be made by yourself.

Therte is one thing you can look at, there are some exhaust gas coolers wit a HSN from a carburater attached. With that you can adjust the pressure.
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