Canton Accusump Electronic Pressure Control (EPC) Operation
09-30-2006, 03:22 PM
#1
Le Mans Master
Thread Starter
Canton Accusump Electronic Pressure Control (EPC) Operation
Is the Electronic Pressure Control (EPC) for the Accusump
essentially a 'normally closed' pressure switch that goes to
'normally open' when the specified pressure value occurs?
Low pressure - circuit closed, valve open.
Adequate pressure - circuit open, valve closed.
.
essentially a 'normally closed' pressure switch that goes to
'normally open' when the specified pressure value occurs?
Low pressure - circuit closed, valve open.
Adequate pressure - circuit open, valve closed.
.
10-01-2006, 06:13 PM
#2
Race Director
no, it is a simple valve. The accusump itself keeps equal pressure against the engine oil pressure. However when you lose pressure at the pump, the compressed air in the Accusump forces that oil into the engine, hopefully filling the void just long enough for your pump to pick up some oil.
I usually rev the engine up as I'm shutting it down, to fill the accusump fully. They I have a little extra boost when I start up. Like to old castrol ads, 99% of all engine wear occurs at startup. That is, unless you are pulling 2-g's around the carousel at Sears Point.....
I usually rev the engine up as I'm shutting it down, to fill the accusump fully. They I have a little extra boost when I start up. Like to old castrol ads, 99% of all engine wear occurs at startup. That is, unless you are pulling 2-g's around the carousel at Sears Point.....
10-01-2006, 07:11 PM
#3
Le Mans Master
Thread Starter
Do you have the electric valve
http://www.accusump.com/acc_products/24_270.jpg
Or what Canton markets here as their E.P.C. Valving?
http://www.accusump.com/acc_products/24_271.jpg
In the case of the latter unit, I increasingly believe that the
add-on component is merely a pressure switch that gets wired
in series in the power circuit to the Accusump electric valve.
(Edit: altered to make images display on demand instead of automatically)
.
http://www.accusump.com/acc_products/24_270.jpg
Or what Canton markets here as their E.P.C. Valving?
http://www.accusump.com/acc_products/24_271.jpg
In the case of the latter unit, I increasingly believe that the
add-on component is merely a pressure switch that gets wired
in series in the power circuit to the Accusump electric valve.
(Edit: altered to make images display on demand instead of automatically)
.
Last edited by Slalom4me; 10-03-2006 at 06:24 PM.
10-03-2006, 12:29 PM
#4
Le Mans Master
Thread Starter
I bought one in the spring but it was in storage. I have it in hand now,
here are some pictures.
The additional component is a pressure switch and is wired Normally
Closed in series. It actuates when oil pressure falls below the target
range and powers/opens the electric valve releasing the contents
of the Accusump.
What is interesting is that the actuation point appears to adjustable
within a range of 0.2 - 6.0 bar. I figure this to be equivalent to
a range of 2.9 - 87 psi (using a factor of 1 bar = 14.504 psi inch.)
It is not apparent from the photo, but the red plastic circular object
on the pressure switch appears to be a cap or a **** - notice the
molded arc with arrowheads. There is also a smaller accessible
screw that also has an molded arc with +/-.
This is good news for me because Canton sells the EPC in three
ranges but the lowest operating range (20-25 psi) is still above my
idle oil pressure. Now I believe I can adjust the one I have to
actuate at a lower more suitable pressure.
As a bonus, I will consider adding a throttle switch that effectively
bypasses the EPC pressure switch at, say 50% or more throttle.
That way, if I have a pressure loss under power/RPM, the Accusump
will begin discharging immediately rather than waiting until pressure
falls to my idle level.
.
here are some pictures.
The additional component is a pressure switch and is wired Normally
Closed in series. It actuates when oil pressure falls below the target
range and powers/opens the electric valve releasing the contents
of the Accusump.
What is interesting is that the actuation point appears to adjustable
within a range of 0.2 - 6.0 bar. I figure this to be equivalent to
a range of 2.9 - 87 psi (using a factor of 1 bar = 14.504 psi inch.)
It is not apparent from the photo, but the red plastic circular object
on the pressure switch appears to be a cap or a **** - notice the
molded arc with arrowheads. There is also a smaller accessible
screw that also has an molded arc with +/-.
This is good news for me because Canton sells the EPC in three
ranges but the lowest operating range (20-25 psi) is still above my
idle oil pressure. Now I believe I can adjust the one I have to
actuate at a lower more suitable pressure.
As a bonus, I will consider adding a throttle switch that effectively
bypasses the EPC pressure switch at, say 50% or more throttle.
That way, if I have a pressure loss under power/RPM, the Accusump
will begin discharging immediately rather than waiting until pressure
falls to my idle level.
.
10-06-2006, 12:53 PM
#5
Le Mans Master
Thread Starter
Some more information.
What I have been refering to as a pressure switch is also
(more?) commonly known as a pressurestat. The red cap DOES
cover an adjustment screw.
You will be amused to discover the application that pressurestats
like this CEME unit appear to be typically used for. Other brand
equivalents appear to be 'Mater' (less liked), 'Sirai' (well regarded
but bulky and expensive) and 'Barksdale' (unknown).
All of these use electro-mechanical contacts which eventually
wear out and lead to replacement of the unit.
(Interested in going digital? Then consider substituting a
PID pressure controller [PID: Proportional/integral/derivative].
With one of these, the right valve and some ingenuity you can
control the accumulator in ways that are not possible with
the CEME pressurestat.)
.
What I have been refering to as a pressure switch is also
(more?) commonly known as a pressurestat. The red cap DOES
cover an adjustment screw.
You will be amused to discover the application that pressurestats
like this CEME unit appear to be typically used for. Other brand
equivalents appear to be 'Mater' (less liked), 'Sirai' (well regarded
but bulky and expensive) and 'Barksdale' (unknown).
All of these use electro-mechanical contacts which eventually
wear out and lead to replacement of the unit.
(Interested in going digital? Then consider substituting a
PID pressure controller [PID: Proportional/integral/derivative].
With one of these, the right valve and some ingenuity you can
control the accumulator in ways that are not possible with
the CEME pressurestat.)
.
10-06-2006, 12:59 PM
#6
Le Mans Master
Thread Starter
If you already have an electric valve for an accumulator, you can
update to the E.P.C. equivalent with kits offered by Canton. The
kits includes a CEME Pressurestat adjusted to one of three pressure
ranges and the brass 1/2" Male x 1/4" Female x 1/2" Female tee fitting
that is necessary to add the pressurestat into the circuit.
The part numbers for the kits are:
line so I'll post that you can get the kit from directly from Canton
at MSRP or for less from places like CarShopInc or LivermorePerformance.
If you wanted to build your own, the CEME pressurestat is available
but seems to come up at prices that wouldn't make it worth my while
to then have to hunt down the tee fitting.
.
update to the E.P.C. equivalent with kits offered by Canton. The
kits includes a CEME Pressurestat adjusted to one of three pressure
ranges and the brass 1/2" Male x 1/4" Female x 1/2" Female tee fitting
that is necessary to add the pressurestat into the circuit.
The part numbers for the kits are:
24-271K (20-25 PSI)
24-273K (35-40 PSI)
24-275K (55-60 PSI) - Note that the p/n on Canton's site is wrong
I have not seen any forum vendors that mention carrying the Canton24-273K (35-40 PSI)
24-275K (55-60 PSI) - Note that the p/n on Canton's site is wrong
line so I'll post that you can get the kit from directly from Canton
at MSRP or for less from places like CarShopInc or LivermorePerformance.
If you wanted to build your own, the CEME pressurestat is available
but seems to come up at prices that wouldn't make it worth my while
to then have to hunt down the tee fitting.
.
