Technical > Matt Shaff's Engine Shop

backing down blower motor

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noslin:
before starting do you back down ALL blower motors or only blower with nitro?    do you just do one complete cycle from example cylinder one , cycle back to cylinder one?

ty
dean

Draw 3D:
I run a blown SBC alky motor and don't back it down.

msundstrom:
It is a nitro thing, I'm injected BBC nitro and pull the plugs after a pass, crank it over for 10 seconds, check the valves then crank it over for 5 seconds and put the plugs back in, I believe the process is different for a Hemi. I have seen the results of not clearing them, I don't want my equipment broken and more importantly no one hurt.

noslin:
thank you, let me add to the question.  if in the lanes, you start the motor (alky) and then have to turn off due to oil down or ?.  when you go to restart while in the lanes is it critical then?   not from the aspect of with running nitro and blowing up the motor such as could occur if nitro motor wasnt backed down, but for ease of restart on blown alky motor?   

i seen a few guys backing down alky blown motor (i think) while watching some of the runs at MM

ty
dean

Paul New:
With a hemi you can back the engine down and the left over fuel in the engine will flow out the exhaust pipe. If you have a wedge headed engine than this exercise is futile unless you remove the spark plugs. Now remember I am one of those kind of guys who say stuff and it's just my opinion take it with a grain of salt.

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