MES ELECTRIC VAC PUMP

Post by **nsuro80** » Sat, 16 Feb 2013, 03:57

Hello

does anyone know anything about :

MES 70 / 6E or MES / Ê2 electric vac pump

is it a good unit ?

and where to buy one

thankyou , Murray

Post by **evric** » Sat, 16 Feb 2013, 04:18

nsuro80 wrote: Hello
does anyone know anything about :
MES 70 / 6E or MES / Ê2 electric vac pump
is it a good unit ? and where to buy one
thankyou , Murray

Hi Murray,

I'm using an MES 70/6E vacuum pump in my EV conversion and it has been running (on and off) for the last 2 and a bit years. They are very good, fairly quiet and have the vacuum switch built in.
Get it from EVWorks.

Eric

Post by **Bryce** » Mon, 18 Feb 2013, 18:01

Hi there - have also heard good reports re the MES vac pump. Personally, have used a number of the Taiwanese ones: http://www.yutai.tw/English/vbs-ev.html. Similar to MES version, but a bit cheaper.

Main difference is the MES-DEA is a bit quieter. In an EV, that can be noticeable!!
Cheers
Bryce

Post by **Sutho** » Tue, 19 Feb 2013, 02:38

I originally used an MES 70/6E pump in one of our cars. Unlike Eric's experience, it was noisy and would not cut-out when down to correct vacuum.

I presumed it must have had a leak in the lines or booster, but it didn't. I tried installing the pump in a PVC box filled with fomofill (exhaust hole vented) to cut down the noise. Still made this EV sound like a 50cc garden appliance.

Gave up and replaced it with a more expensive billet unit that is commonly used by hot-rodders. Problem solved.

Post by **evric** » Tue, 19 Feb 2013, 03:15

If there wasn't a leak (it doesn't need much), it must have been faulty.
I have helped several people install these an each time they have worked a treat. I don't hear mine except when I'm stopped at the lights etc. - sometimes. I use a reservoir (about 2 litres) which really helps keep the usage down. Without a reservoir the unit come on and off too much for my liking. The mounting position will help with the noise as well. Mine is way down in the front corner of the engine bay.

Post by **nsuro80** » Tue, 19 Feb 2013, 03:23

hello ! thankyou for your reply . I plan to use the pump on a rotary engine car in place of the mechanical vac pump. It will be used with a i would say 3 litre vac reserve - the vac booster is a moderate size - not large . So you would say the MES unit is a good one to use ? How long have you had yours in operation for ? And where can i buy one ?

Post by **Sutho** » Tue, 19 Feb 2013, 03:30

No doubt the internal vacuum switch was faulty from new. When I removed it I found that the unit never cuts-out.....even if the inlet port is totally blocked.

It certainly isn't quiet either. Not on a near silent EV.

Post by **evric** » Tue, 19 Feb 2013, 04:24

See my post of the 15th February above - over 2 years use. Highly recommended.

Post by **Vortex** » Tue, 19 Feb 2013, 07:29

I too use the MES70/6E and it is very quiet when mounted in the front wheel well. The continuous operation that Sutho experienced may have been wiring. It has two power terminals. Connect 12v one way and it runs continuously, reverse the connection and the vacuum switch functions.

Post by **evric** » Tue, 19 Feb 2013, 12:33

Vortex, Is that documented somewhere or did you find out by accident?

Post by **Vortex** » Tue, 19 Feb 2013, 17:52

Evric, I bought my pump from the USA and it came with more docs than you see normally. The continuous running mode they call diagnostic and there is no harm to the pump running in reverse through a internal bridge rectifier. However they dont recommend this mode for normal running as the pump can overheat. I find in pracise the pump runs for about 10 seconds and cycles about every second time I use the brakes. Having an external reservoir is of dubvious value anyway as the pump still runs as long, just the duty cycle is different.

I summary there is a + and - symbol moulded inside the connector body above the pins. Connect + to +12v for switched operations and - to +12v for continuous operation.

One feature I would like to see is a two stage output on the solid electronic switch so that low vacuum can be sensed to meet our EV guidelines. I had to add an external industrial switch + fittings which is costly and adds more failure paths.

Post by **evric** » Tue, 19 Feb 2013, 19:02

Thanks Vortex - Very interesting. So if the internal vacuum switch ever failed, one could add an external vacuum switch and then reverse the wiring to the pump. Excellent!
Can you upload or PM the extra document(s)please?

Post by **Richo** » Tue, 19 Feb 2013, 20:56

Sutho wrote:Gave up and replaced it with a more expensive billet unit that is commonly used by hot-rodders. Problem solved.

+1 to that.
They look 100x better too.
Except some of the billet units aren't that expensive compared the MES units these days.

Post by **Sutho** » Tue, 19 Feb 2013, 23:10

I got mine from Summit racing. They are priced at about US$370 from memory. I got a spare diaphragm kit as well just in case. Pretty sure it all landed here in under a week for about $500.

This pump set-up made it easy to put a crude muffler (rag jammed in a small pvc box with some small holes drilled in the opposing end) on the intake. Much smoother and quieter than the MES.