Drag Racing Discussions > Front Engine Dragsters

Correct starting & shut off procedure of a blower motor

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arush:
Once again, I come to this forum for wisdom.
I am really close to starting my first Hilborn 4 port, alcohol injected blower motor and would like to know the proper sequence (step by step) to starting and shutting it off.
The motor is 100% fresh and has only been ran for a few minutes with a carb/intake to break in the cam.

Is this even remotely close ?

Starting procedure -  (this could be totally wrong)
(1) Mag switch "OFF".
(2) Open up fuel pump & turn motor over to check for oil pressure.
(3) Stop turning motor over.
(4) Open throttle and squirt some gas down into the ports.
(5) Close throttle, turn motor over for a few seconds and then turn "ON" the mag.

Shut Down procedure - (this could also be wrong)
(1) While motor is idling, shut off fuel pump.
(2) After motor stops running, turn "OFF" the mag.

As always, All feed back is greatly appreciated.

coupemerc:
I recommend doing things differently than you listed. Check for oil pressure in the pits with the spark plugs out of it. Leave the mag off and the fuel shut off and crank the motor. That way you will not kill your batteries.
There are variations but here is what I do

To start  it...
Mag off, fuel on.
Open butterflies and squirt Alcohol into/past butterflies
shut butterflies
crank motor for about 2 seconds and turn on the mag.
As motor starts keep squirting alky into the injector until it runs on it's own. You can use gas if it is colder out. If you are priming with alky you can squirt in a lot of volume. The volume that you are putting in is small compared to what the nozzles will deliver.
Watch for oil pressure and any leaks. Keep track of the head temperature and idle speed

To shut it off...
Close fuel
engine rpm will come up and just as it starts to come back down, kill the mag.

If you are starting it for the very first time. I would leave the fuel off and just see if it fires smoothly on the primer first. That way you can tell if there are any ignition or timing issues.

Good luck!

arush:
Appreciate your feedback Coupemerc.
Your recommendations make sense.
I am sure others may have a slight variation to this routine.
Just trying to get myself educated to this new set up.
Thanks.

crider:
I used to fire the funnycar basically the same way coupemerc described, only difference is we squirted with gasoline

coupemerc:
Note that I edited my original post! Before you crank the motor to start it, fuel needs to be ON. Also, if you have aluminum blower studs do not over tighten them or they will crack. Also leave the blower belt a little loose when the engine is cold. Set the final blower belt tension when the engine is fully warmed up. Good luck

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