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Old 04-06-2012, 07:25 PM   #1 (permalink)
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Impco Model E question

at the 6 o'clock position on the front face of an Impco Model "E" regulator there is a gold colored screen. what is the function of this part? i have a model E but the gold screen on mine has been replaced by a pipe nipple and I dont know what goes there. it is definitely pulling a vacuum so I have a hard time believing that nothing goes there otherwise it would fill the regulator up with dust and dirt. I finally got my rig running today and cannot get the idle down to a reasonable RPM and I am wondering if this piece missing is part of my problem. If I block it off with my finger it kills the engine so I suppose it has to see some amount of air flow, but can someone explain? I also have a 300a on top of the engine, if anyone has a good resource for tuning I would appreciate a link or advice. thanks!
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Last edited by Spacecwboy; 04-06-2012 at 07:26 PM.
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Old 04-06-2012, 07:31 PM   #2 (permalink)
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That's a port that can be used to connect the regulator to the carb. If you look on the carb it should have one too. On the two pane setups I've built neither had it hooked up.
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Old 04-06-2012, 08:56 PM   #3 (permalink)
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should say "BAL" right beside the port indicating balance line to allow reg to compensate for filter restriction (or boost)
without it hooked up you will run richer as air filter plugs
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Old 04-06-2012, 11:12 PM   #4 (permalink)
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What does it hook to?
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Old 04-06-2012, 11:51 PM   #5 (permalink)
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on the 425 there is a port marked 'BAL'
prolley has a pipe plug in it on yours
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Old 04-06-2012, 11:54 PM   #6 (permalink)
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wait a sec read the OP a lil closer..its pulling a vacuum?
then the diaphram is toasted and needs a rebuild kit.
should be ambient pressure to reference the reg, the balance is to reference it to what the mixer is actually seeing

Last edited by mj; 04-06-2012 at 11:57 PM.
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Old 04-07-2012, 01:16 PM   #7 (permalink)
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Quote:
Originally Posted by mj View Post
wait a sec read the OP a lil closer..its pulling a vacuum?
then the diaphragm is toasted and needs a rebuild kit.
should be ambient pressure to reference the reg, the balance is to reference it to what the mixer is actually seeing
if it is a constant vacuum, then yes.

going by my model L, the area inside is sealed. so when vacuum is placed on the propane vapor port, is sucks the diaphragm down, which will cause a lower pressure area inside the evaporator above the diaphragm and will force air into the port until it is equalized. if you plug it up like you say, it will be impossible for the evaporator change the flow of propane vapor either increasing or decreasing without enough force to stretch the diaphragm.



here is how it is hooked up on my setup with model L and 125. red hose is balance hose.


can browse through my account to see images of how the L is assembled and the 125 to get an idea of what happens inside.
http://s5.photobucket.com/albums/y17...cpZZ1QQtppZZ20

use PW pirate.

Last edited by crimsen; 04-07-2012 at 01:18 PM.
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Old 04-07-2012, 06:08 PM   #8 (permalink)
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Quote:
Originally Posted by crimsen View Post
if you plug it up like you say,
I never said to plug it up.
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