WTB: Water pump delete plate.

[quinn11m20]

There was a thread about it earlier this year. One of the members had it machined for them. I want one myself. Any help is appreciated. Thanks. Tony.

[quinn11m20]

So no help. None of you really remember?

[quinn11m20]

Help! Anyone?

[iamcreepingdeath]

why the crap would you want to delete your water pump??

[quinn11m20]

To put in an electric one and to free up some HP. K.

[iamcreepingdeath]

sorry, i guess i don't understand how that works.  Doesn't an electric pump just bolt in place of the old mechanical one?

[1991 E30 M42]

not the one hes looking at, but what he fails to realize, electricity is not free or reliable, even though you remove the water pump you add drain to the battery which results in an alternator working harder. This extra load adds resistance in its rotation and possibly shortens its life for .0025 extra horsepower and less reliability. They are great for a drag car that never sees the streets but i would never use an electric water pump on the street, especially for a daily driver.

[quinn11m20]

Well actually the one I am looking at is a Davies Craig model from HRP motorsports. The kit comes with a thermal time switch SO YOU CAN USE IT AS A DAILY DRIVER! Ooooh! and even an electric fan so I can USE IT AS A DAILY DRIVER!

[nicknikolovski]

Don't bother with it. I've had experience with other electronic components in vehicles, such as electronic power steering pumps, electric motored steering racks, electronic thermostats from other BMW's - all just crap. They are too problematic but it is your choice in the end.

Also not sure if there was a M42 w/pump delete plate available. I think I remember seeing a custom made one.

[quinn11m20]

Yeah nick thats what I am looking for. Thanks.

[Boyracer]

not the one hes looking at, but what he fails to realize, electricity is not free or reliable, even though you remove the water pump you add drain to the battery which results in an alternator working harder. This extra load adds resistance in its rotation and possibly shortens its life for .0025 extra horsepower and less reliability. They are great for a drag car that never sees the streets but i would never use an electric water pump on the street, especially for a daily driver.

Electric water pump only really strains the electric system when engine is running on full power for extended periods and needs lots of cooling. Then there is plenty of electricity to run the pump anyway.

Also you do not need to waste power running the mechnical water pump when it is not needed and also if you run the engine on higher revs than it was designed to work, mechanical pump can cavitate and lose efficiency. Electronic pump can be controlled and run on optimum speed.

It's same as it is with electric fan vs. visco coupled fan, it can work just fine if little bit of thought is put into design. Prodrive has used electric water pump on Le Mans with Ferrari 550 Maranello, Aston Martin factory team has used them etc.

By the way, current BMW models with six cylinders or more use electric water pumps so if you are going to stay with BMW in future also, better be careful on daily traffic if you happen to buy one

[quinn11m20]

Thank you boyracer. Thats the support I am looking for. All the negativity is because of lack of experiance and cowardice.

[qualicas]

If done correctly, an electric fan could fix the poor BMW cooling water path.
There would have to be a block in the profile gasket area preventing water running from the head back to the water jacket. Instead it would run through the thermostat into the top of the rad. Backwards to the way BMW designed it. The electric pump would then be installed in the lower rad hose pumping into the water jacket. Only other mod would be to extend the heater core return line directly to the rad and block of the head fitting. If I was going to do another BMW engine there would be no question I would do this and avoid all the "my engine is overheating" problems.

[bearsbmw]

keep in mind that freeing up the crank too much can result in loss of power due to the stock ign tune and even pre detination in some cases... retune or it's not worth it...goodluck!

[Esprit Aviation]

I am planning on converting my son's 318is to a Davies-Craig pump.

I have successfilly run one for 5 years on my '85 Lotus Turbo Esprit with no problems.

In fact I will use one whenever I have to change a pump on any vehicle.

Use a DC variable speed drive for it. Davies-Craig offers a controller, which is ideal, but expensive. I am using one from Delta Current Control.

I cannot provide any dyno results or detailed MPG data, but I assure you it is faster and gets better mileage.

Anyone concerned about current or horsepower loss? The one on the Lotus uses approx. 3amps @ full speed/load (which is rarely). A drain on the electrical system? Hardly.

P=IxE, P=3x12, P=36 watts.  1 horsepower = 746 watts

36 watts < .05 horsepower

How much horsepower is consumed by your engine driven pump @ 6500 RPM? The electric pump never exceeds  .05HP.

I disagree with the previous reply. If that were true, most of us here would not be doing the simple mods that free up crank HP.

On the '91 318is we deleted the A/C, power steering, fan clutch and engine driven fan (another HUGE waste of power) We also removed 5 pounds of rotational mass by converting to the 325i flywheel and clutch assy. The car is significantly faster

These are relatively common mods to many vehicles. I have never heard of loss of power or pre-detonation occuring. Conversely, lightening the load on any engine will help to prevent pre-ignition and detonation.

BTW: We had the 318is dual mass ring gear put on the 325i flywheel, it simply needed to be turned down a bit. This allowed use of the stock starter w/ no other mods. One thing that was surprising is that we also used the 325i TO bearing supplied in the kit instead of the harder to find 323 TO bearing. The whole set-up works fine.

Lee