Re: EV brake vacuum leaks

[Seth Murray]

when my system holds, I leak pretty much no air into my vacuum system at all. I have two check valves. There is the original one in the brake booster, and my own directly after the pump. When the pump check valve isn't working, it cycles on and off fairly quickly. The vacuum in the booster is held just fine, the only vacuum I loose is in the hose. the best way to tell where you're loosing vacuum is with a little condenser mic on a stick hooked up to a little op amp and headphones or something....

Seth



On Saturday, October 12, 2002, at 12:08 AM, Lawrence Rhodes wrote:

How would one test this? My system only holds for 8 and a half minutes. I
got clamps everywhere. What is the symptom for the bad check valve?
Lawrence Rhodes....
----- Original Message -----
From: "Victor Tikhonov" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, October 11, 2002 2:35 PM
Subject: Re: EV brake vacuum leaks

Honda check valve worked fine for me. You can find one
on the junk yard. (I took it out because MES pump I use now
has this valve integrated in.)

Victor

Seth Murray wrote:

actually the entire leak is through the pump! when the pump's off air
can flow back into the system through it. When the check valve is
working, the car will hold vacuum for a few days. when it isn't
working. leaks like a sieve. weird.

Seth

On Friday, October 11, 2002, at 12:01 PM, Mark Dodrill wrote:

I'm not sure it's worth the effort.  Unless your power brake pump
cycles
a lot when you aren't pressing the brake, it probably doesn't have

very

much of a leak. You might be wasting a few watts, but there are other
places
you can make up efficiency to compensate.

My 2 cents.

Mark

-- Original Message --
Date: Fri, 11 Oct 2002 11:48:27 -0400
Subject: EV brake vacuum leaks
From: Seth Murray <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]


A while back someone posted something about vacuum system leaks. My
system works well except that I have been unable to find a reliable
check valve. I have tried three or four different check valves, and
on

all of them, if you put a hose clamp on it seems to distort the case
and not check properly but if you just push the hose on it isn't

tight

enough and it leaks. What check valves have other people found to
work? thanks

Seth



--
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Mark Dodrill

--
QUESTION INTERNAL COMBUSTION

My electric truck page, with lots of photos and a 25 page conversion
journal.  Check it out!
http://users.wpi.edu/~sethm/  (no more popups!)

My EV Album page
http://www.austinev.org/evalbum/387.html

--
QUESTION INTERNAL COMBUSTION

My electric truck page, with lots of photos and a 25 page conversion journal. Check it out!
http://users.wpi.edu/~sethm/ (no more popups!)

My EV Album page
http://www.austinev.org/evalbum/387.html