Just remembered...to add to my original reply post.
One important thing to mention is that the master cylinder vacuum boosters
that were installed originally for ICE applications. Your (20 year old
booster) would still operate successfully because you had full time vacuum
when the engine was operating even if there were minor leaks in the booster
or ICE vacuum system.
I found my original brake booster had some leakage at the hose/grommet point
(grommet deformed and brittle with possibly some internal leakage). Because
I could not find a grommet to fit and the vehicle should last another 15-20
years, I replaced the whole master cylinder/brake booster combination.
I found when I changed the parts out, I had less vacuum motor run time
between brake depressions and a firmer brake peddle.
Food for thought for any old ICE->EV conversion.
Terry Forfa
--------------------------------------------------
From: "Terry Forfa via EV" <[email protected]>
Sent: Thursday, September 11, 2014 5:49 AM
To: "EVDL Administrator" <[email protected]>; "'Electric Vehicle Discussion
List'" <[email protected]>
Subject: Re: [EVDL] Vacuum Switch
A larger tank may help but the pump will run longer to "fill the tank"
with vacuum pressure once it reaches down to the switch's cut in point.
I did not see the type of vacuum switch on your EValbum page photo but
appears the tank is in the motor compartment under the hood. If it the
standard Square D pressure switch, there is some adjustability in the cut
in and out pressures but I personally would rather it cut in more often to
maintain the system pressure than to where the vacuum tank/system would be
near empty in case of needing another deep brake depression during
cycling.
If the issue is the noise bothering you when it comes on, you may want to
relocate the pump motor or the motor/ tank combination to the trunk or
maybe even under the rear of the car.
The pump noise will be behind you and the noise will travel rearward as
you drive. The extra length of vacuum hose to the power brake booster on
the firewall will also act as additional tank capacity of your existing
tank and you will still have the same amount of hose connections in case
you worry about leakage points.
I did this on my Ranger Truck EV along with putting it in an insulated box
with ventilation and reduced the noise to where you had to actually strain
to hear it. For piece of mind, I installed a LED light indicator on my
dash wired off the pump motor run wiring to indicate when the pump was
operating.
Terry Forfa
--------------------------------------------------
From: "EVDL Administrator via EV" <[email protected]>
Sent: Thursday, September 11, 2014 4:31 AM
To: "'Electric Vehicle Discussion List'" <[email protected]>
Subject: Re: [EVDL] Vacuum Switch
On 11 Sep 2014 at 3:32, Buddy Mills via EV wrote:
I am about to put two switches on and use a relay to
accomplish but was wondering if there was a simpler way to keep the
vacuum
pump from cycling so often.
I'd suggest a larger vacuum tank.
David Roden - Akron, Ohio, USA
EVDL Administrator
= = = = = = = = = = = = = = = = = = = = = = = = = = = = =
EVDL Information: http://www.evdl.org/help/
= = = = = = = = = = = = = = = = = = = = = = = = = = = = =
Note: mail sent to "evpost" and "etpost" addresses will not
reach me. To send a private message, please obtain my
email address from the webpage http://www.evdl.org/help/ .
= = = = = = = = = = = = = = = = = = = = = = = = = = = = =
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
