Overdrive my water pump - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!
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post #1 of 22 Old 12-18-2018, 08:21 PM Thread Starter
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Overdrive my water pump

So ive had an underdrive pulley on my Omni GLHT for years. Im running standalone engine management off that pulley. I would like to speed up the waterpump. Is anyone aware of a pulley that I could use. Anything that will match the bolt pattern.The next step would be to have an OEM pulley modified in size..
Its a reverse style pump.
Thanks
Kim
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post #2 of 22 Old 12-19-2018, 01:35 PM
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Re: Overdrive my water pump

2 questions:

Why are you running the EMS off of a belt driven pulley (especially one in the system that is known for slipping under load)?

Why would you want to overdrive the waterpump when they already have cavitation issues at higher engine RPM?

Change the location of the EMS pickup to the crankshaft pulley.
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post #3 of 22 Old 12-19-2018, 03:13 PM
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Re: Overdrive my water pump

Wazee's Billet Aluminum Pulleys

contact him
he is in town.
have cash. dont waste his time.
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post #4 of 22 Old 12-19-2018, 03:43 PM
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Re: Overdrive my water pump

belt slippage on the underdrive pulley on the crank won't affect timing if a magnetic pick is running off a signal from that pulley

with note to the cavitation issue your best solution is probably an electric inline water pump
and a motor speed control switch
and as a bonus you can let it run after shutdown too
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post #5 of 22 Old 12-19-2018, 05:22 PM Thread Starter
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Re: Overdrive my water pump

Thanks for the responses.
to answer Reaper1's questions. I am running the pickup wheel off of an under drive crank pulley
I would simply go back to a stock crank pulley but then I would would have to modify it with
a new crank trigger and build another adjustable mount.
The alternator is an easy fix, but I have yet to find an overdriven water pump pulley.
The water pump is designed to run at a speed in relation to the engine rpm , Ive screwed with that and suffer the low speed water pump performance as a consequence. I agree with the electric water pump solution! Just looking for ideas. Again thanks
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post #6 of 22 Old 12-20-2018, 09:20 AM
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Re: Overdrive my water pump

I showed you mine, will you show me yours?

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post #7 of 22 Old 12-20-2018, 01:45 PM
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Re: Overdrive my water pump

Quote:
Originally Posted by KWimmer View Post
Thanks for the responses.
to answer Reaper1's questions. I am running the pickup wheel off of an under drive crank pulley
I would simply go back to a stock crank pulley but then I would would have to modify it with
a new crank trigger and build another adjustable mount.
The alternator is an easy fix, but I have yet to find an overdriven water pump pulley.
The water pump is designed to run at a speed in relation to the engine rpm , Ive screwed with that and suffer the low speed water pump performance as a consequence. I agree with the electric water pump solution! Just looking for ideas. Again thanks
OK, your original post made it sound like you had the trigger wheel on the water pump pulley.

To say that if the crank slipped in relation to the pulley that was sending the crank position signal won't affect timing...umm...somebody's going to have to prove that one to me. I bet you end up with at the very least a non-running engine and at worst a pile of scrap.

I don't disagree that the drive ratios of the accessories have intent behind them, however, if you are having a cooling issue because of under driving the water pump, your cooling system has a problem. This simply shouldn't be a problem. I daily drove my Shelby Z with a UD pulley in Florida...in traffic...in summer. NEVER overheated. I DID kill the battery in traffic once by having every accessory on at the same time and the alternator wasn't charging enough to keep the battery from being drawn down at idle. I was running a PC680, so it has NO reserve. A larger battery would have lasted a bit longer.

IMHO US pulleys aren't worth it when there are other options. I'd rather have a lightweight stock sized crank pulley just to reduce rotating inertia.
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post #8 of 22 Old 12-20-2018, 02:30 PM
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Re: Overdrive my water pump

Quote:
Originally Posted by Reaper1 View Post
IMHO US pulleys aren't worth it when there are other options. I'd rather have a lightweight stock sized crank pulley just to reduce rotating inertia.
What other options?
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post #9 of 22 Old 12-20-2018, 05:20 PM
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Re: Overdrive my water pump

Like Dr. Johnny posted, electric water pump, manual/electric/electro-hydraulic steering. The alternator doesn't put much load on the system, especially when not charging. The A/C compressor puts no load under WOT or when off. Water pump can be replaced with electric unit. Power steering can be replaced with manual (or looped for "poor man's manual"), or if it's absolutely needed, then there's the electro-hydraulic solution or the full electric assist conversion.

One of my only reasons I used an UD pulley was to slow the accessories down while on track for less wear at higher rpm. I do road course track days and such, so 20 minute stints beating the living hell out of it. I've decided there's better options to UD pulleys.
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post #10 of 22 Old 12-30-2018, 07:59 PM
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Re: Overdrive my water pump

omnis have a horrible cooling fan. speeding your pump up should be done but adding a pusher fan on the driver side will also help. maybe even fix your cooling issue if you haven't already addressed the single fan setup. do you still have the ac condenser? the extra fan is definitely needed if so. I couldn't keep my engine cool at a light even with the normal pulleys.

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post #11 of 22 Old 01-02-2019, 01:01 PM
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Re: Overdrive my water pump

Don't like the cooling fan on your L-body? Got room issues? Got cooling issues? Don't want to run a pusher fan or try to fabricate a shroud for an aftermarket fan?

Look no farther than the 1990 V6 fan. Flat motor for more room, shroud is integrated and only needs slight modification to fit. Has the correct pigtail to plug into your factory harness. Moves a TON of air....

You're welcome. ;)
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post #12 of 22 Old 01-07-2019, 06:01 PM Thread Starter
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Re: Overdrive my water pump

All good ideas and comments. My 2.5 Omni has big aftermarket aluminum rad with modified front end, spal fan and Delta Current controller. There is a heat exchanger cooler for the air/water intercooler setup in front of the rad. I can idle all day with cool results particularly when the hood is open. At higher engine speed with low vehicle speed is where it runs hot. Once the forward car speed is up its good again. Its definitely an issue with evacuating air from under hood at those lower speeds.

I did some pressure testing under hood and on top of hood with a magnehalic gauge and now plan on venting the hood. Its not a GLHT hood on it!

I think that with the UD pulley at those speeds Im concerned with is hampering cooling. I think I will go with an electric pump. First I will vent the hood and look for improvements.

Ive had the car for 15 years and its a garage queen , I think I overbuild things but its all fun and I appreciate the responses.



Thanks Kim
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post #13 of 22 Old 01-08-2019, 01:00 PM
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Re: Overdrive my water pump

Do you have the front end blocked off so the air has no choice but to go through the heat exchangers? Do you have a lower air dam?

Just curious....
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post #14 of 22 Old 01-14-2019, 11:06 AM Thread Starter
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Re: Overdrive my water pump

Yes to both questions , although I am using the original L Body air dam , not an extender S10 style version. Anyone used a FlowKooler water pump that could comment on its performance.

Thanks
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post #15 of 22 Old 01-14-2019, 11:18 AM
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Re: Overdrive my water pump

if you only want to see if there's a working difference simply raise the rear edge of the hood instead of hacking holes in it

it's an old -old school trick
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