water injection on a t1

[1985glh]

im thinking about putting water injection on my 1985 glh but i was talking to a guy i work with and he told me that its a bad idea because my air intake comes off the tb so it would hydrolock the engine right away is this true?
if thats true(which i dont think it is) is there another way to do it?
i just think the guy i work with doesnt want me to beat his honda.
thanks
tyler

[thedanielm]

no its not true if you have check valves/solenoids set up correctly to stop water from being siphoned in.

[1985glh]

so i just make sure its not leaking/spraying alot in to there and it worrk right

[dvldoc]

Quote:

Originally Posted by 1985glh im thinking about putting water injection on my 1985 glh but i was talking to a guy i work with and he told me that its a bad idea because my air intake comes off the tb so it would hydrolock the engine right away is this true? if thats true(which i dont think it is) is there another way to do it? i just think the guy i work with doesnt want me to beat his honda. thanks tyler

This guy doen't know jack. Number one there is less than a inch of vacuum in the intake when the throttle body blade is closed. It's not enough to siphon water from the pump. You need at least 8 inchs of vac in most cases to siphon. A simple 1psi check valve is all that is needed for 99% of water injection systems and this is only if you have mounted the tank higher than your nozzle.

[1985glh]

yeah thats what i thought
just wanted to check

[thedanielm]

Quote:

Originally Posted by dvldoc This guy doen't know jack. Number one there is less than a inch of vacuum in the intake when the throttle body blade is closed. It's not enough to siphon water from the pump. You need at least 8 inchs of vac in most cases to siphon. A simple 1psi check valve is all that is needed for 99% of water injection systems and this is only if you have mounted the tank higher than your nozzle.

umm at idle (when the throttle blade is closed) you should have approx 17inhg of vaccum what are you talking about?

but yes a simple check valve will solve all that siphoning problems.

[dvldoc]

Quote:

Originally Posted by thedanielm umm at idle (when the throttle blade is closed) you should have approx 17inhg of vaccum what are you talking about? but yes a simple check valve will solve all that siphoning problems.

17 of vac is before the blade not after it. I can show you a few hundred installs of it just like that if you need to see what I'm talking about.

If you mounted the nozzle in a spacer between the intake and the throttle body then yes you need a check valve. But just like the Grand prix, SRT-4, WRX, Buick Grand national, All LS1 applications mounted pre throttle body ect, ect, and ect. we don't use a check valve unless the tank is mounted higher than the nozzle itself.

Yes your car makes vacuum at idle but that vac is behind the blade, Connect your boost vac gauge in the intake pipe, get a reading then you'll see what I'm talking about your vac will be less than 1in. Now if you have a odd set up like the NON-IC grand nationals where the turbo is right on the throttle body and you plane on putting the nozzle in the Tb after the blade you will need the check valve.

[4sfed4]

The 85' GLH uses a suck through setup (i.e. the TB is before the inlet of the turbo).