Marcus Frost

How long did it last you? How did you figure out it failed?

I think mine has failed on my 55, but it's difficult to know for sure until I replace it (Thursday).

-m

TTMotorsports

I hope you are putting in a Meziere Marcus!

Vader55

I have had mine for 2 years and no problems, It will be interesting to see what you find out but I doubt that would be the problem.

shardul

iTrader: (1)

Meziere WP136 is the way to go!

Marcus Frost

After reading everyone's responses on here, and in my datalogging thread (https://mbworld.org/forums/w211-amg/...rs-thread.html), I think it's time to call it quits with the CM30. I'm ordering up a Meziere pump and going to try that.

It looks like the days of recommending the CM30 to people are numbered...

Thanks to everyone for the advice.

-m

Marcus Frost

At this point it is one of the only remaining possible culprits. I honestly think it is the pump - why it has failed, I don't know, but I am pretty confident it has to be the problem. I will make sure to update the datalogging thread to let people know what I find.

-m

MB_Forever

I personally know of at least 4 guys local to me that have been running CM30 for the past couple of years with no problems. My understanding was that they do not have a very high failure rate Most of my friends do not data log regularly though, but they do log once in a while (mostly at the track). One of them runs the car very hard almost all the time.... I'll ask him if he has noticed any problems with his CM30.

jangy

Any pump can fail but the CM series are pretty stout. I'm not a personal fan and prefer a pump made to handle the fluids that we run (i.e. an automotive cooling pump like the Davies). I haven't tried the one shardul is touting but he is a straight up dude so that may also be an option.

The CM30 is honestly only good because minimal mods are needed to mount it. the newer OEM pumps are just as good IMO.

E55AMGGG04

I have the Cm30 pump over 1 year and actually never had a problem with my s.c turning off.

Unfortunately I do have a problem. My Cm30 is not sealed sumwhere cauz its now leaking and I have my coolant leaking slowly. I found out first time I installed but I tried to seal it but it now started leaking again.

I ordered a spare Cm30 pump just incase I ever run into problems and its brand new in the box. I'm going to install the new 1 when i get a chance.

blackbenzz

My C090 failed twice. They start leaking internally and get corroded and give out. At least thats what happened to mine. I like to take stuff apart after they fail to find out why or at least try.

Meziere makes great durable pumps. Lots of race cars use them. Lots of cobras use them too.

320 dreamer

i have the cm30 in mine without issues for over a yr now.
something to consider with the meziere or any other high volume pump is the flow rate. dont get one so big it overloads the i/c and causes a possible leak. just a thought.

TopGun32

I have cm30 on both of my cars.

1 pump has about 2+ years (c32)
and the other is under 1 year. (E55)


Next I'm going to upgrade to the CM90 with 20mm or 3/4" connections... not as free flowing as the 1" connector, but faster than Cm30.

I will look into the Mezerie pump as well.. but probably will need to see a write up to mount it correctly.

Marcus Frost

If anyone is interested in ordering the Meziere, you need three things - the pump itself and the two fittings. These are the part numbers. They are available from Jegs/Summit/etc.

WP136S PUMP (x1)
WP12034B -12 AN to 3/4" FITTINGS (x2)

Exotic-metal55

My stock pump went out, as I raced a vette two years ago. Won the first race but got beat the second..lol I knew something was wrong! Bought a data logger and Iat`s were hitting 200 plus.. Read the forum and got suckered into the Cm30 Data logged and seemed good. Drove a few weeks and car felt week again. Put data log on and bad Cm30.. Of course MFG blammed my install , blah blah blah.. Bought another one and it showed to be running cool and fine.. Went to a dyno ,, made two pulls and heater hoses blew off the car on the dyno!!! Again, Cm30 was out and caused me a ton of grief!

Both pumps lasted about 150 miles.. Most people may never know, unless they data log, gets hot outside or they are real in-tune with their car.. The CL, S and SL class seem to eat them faster. They also have more fins to push water through on their stock H/E..

I ran the stock HD Bosch pump and had zero issues , until finding the super mega Meziere pump! It runs full time.. Pretty wild seeing IAT`s 48 deg. on a 40 degree day.. That is a leat 50 deg. lower than people running ECU controlled stock or CM30 pumps..

Here is the Meziere next to stock HD Bosch pump.. The Cm30 is much smaller than both, if size matters to you..

blackbenzz

If size matters check out the CM90!

Exotic-metal55

Hey, I whipped my main pump out next to the bosch,, don`t be modest.. Everyone says they have a big one..

320 dreamer

i doubt if anyone in a c class sl class or any class runs a bigger h/e than i do and my cm30 runs flawlessly for over a yr now.
that h/e is 26"wx16"tx2"d

blackbenzz

Haha. My pump is on my car but my point was that size doesn't matter, at least not in this case. Flow matters.

CM90: 244 mm long x 120 mm wide x 150 mm high

Meziere WP136S: 190.5mm tall x 88.9mm wide x 88.9 long

Ahem, mines bigger

The Meziere is cheaper, flows more, and fits into a smaller space. The Johnson pumps have inlet/outlet oriented the same as stock (90 degrees) but the Meziere has them 180 degrees apart. FYI, Kleemann uses Johnson C090 pumps with their sc kits.

FYI, too much flow can be bad and can cause the coolant to foam