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Old 08-15-2011, 02:50 AM
Join Date: Jan 2011
Location: Colorado
Posts: 474
Water-Methanol injection

Per request, here is a summary of my water-methanol injection systems.
Original thread:

My system has a Shurflo 8000 pump set at 120psi. The two reservoirs are 1.5gallon coolant expansion tanks from 90's Chevy pickups connected in parallel. The pump power is controlled by a dash-switch signaling a relay by the pump. The pump tubing is 3/8" to the pump inlet and 1/4" elsewhere.

There are two stages and 6 nozzles.
First stage is 1x70cc nozzle set to activate at 3psi boost, second is 5x70cc nozzles at 12psi. The first stage is disabled when the second is active for a total injection of 350cc/min@120psi. This flow rate is good for 13whp when using 33% methanol (-20 washer fluid). More flow is not recommended when used with an intercooler, without an intercooler another 100cc/min could be used safely.

The battery and pump are located in what was formerly the spare tire well. Since the picture was taken, a NAPA 3003 fuel filter was added to the inlet hose.

The two valves are Parker K family from Fiero Fluid Power and the two Hobbs switches control them.

First stage at the inlet of the intake manifold.

The other 5 nozzles in each runner of the W115 intake manifold for equal distribution.

The water injection system is similar in my 240D but with only a single 300cc nozzle set to trigger at 8psi boost and the pump is located in the engine bay.

Air compressor and 3gallon air tank above.

Nozzle and valve with the stock T3 turbo and intake manifold.

With the w115 intake manifold.

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Old 08-15-2011, 04:19 AM
oldsinner111's Avatar
once a happy man
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,781
Forced have you seen,any more power,or just cooler EGTs.I have a Shur Flow 50psi pump.Anyway I could use it for gas or diesel.
come on people now,smile on your bro,everybody get together
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Old 08-15-2011, 04:24 AM
Join Date: Jan 2011
Location: Colorado
Posts: 474
Just more power. Combustion of the methanol offsets any cooling benefits, kind of "something for nothing" power.

50psi is too low. It needs to be at least 100psi for good atomization, 200psi would be best. Don't forget boost pressure opposes some of the pump pressure (thats why I raised mine to 120psi).
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Old 08-15-2011, 06:05 PM
Registered User
Join Date: Jul 2008
Location: virginia
Posts: 496
have you tryed it with just water to see what cooling would be?
1977 240D turbo
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Old 08-16-2011, 03:01 AM
Join Date: Jan 2011
Location: Colorado
Posts: 474
No point really, whats why I have an intercooler, and straight water will destroy the system when it freezes in my area's -15*f winters.

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