Technical > Matt Shaff's Engine Shop

backing down blower motor

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Frontenginedragsters:
Paul New, Your right.
The idea is to turn the engine backward to push left over fuel out the exhaust valve into the header.
Any engine other than a HEMI does not have the exhaust valve and port pointing down for liquid to free flow.
Spark plug removal and spinning free will blow it out of that hole.
Nitro requires large volumes of fuel and often times uses down port nozzles.
These nozzles have check balls and springs to prevent fuel flow at idle.
Never assume that Nitro is not leaking down when the engine is not running.
Backing it down will prevent disaster if fuel is in the cylinder.
Nitro is just like dynamite or diesel fuel. It needs to be compressed to light.
I've been involved with Nitro cars for many years.
I have seen first hand what happens when an engine is turned over to start and it was assumed the cylinders were clear.
Its very volatile and can be deadly when not treated carefully.

Matt

BK:
If you are talking about an injected motor on alcohol. Its best to kill the engine with the fuel shut off and then the ignition. That way you don't have as much fuel above the nozzles to leak out into the cylinders.

noslin:
awesome, thanks everyone
dean

wideopen231:
Firm believer in pulling fuel shutoff before clicking the mag . One bent BBC 7/16 steel rod made me that way. I see lots of guys not doing so , but its their motor . Even with blown alky I have never backed a motor down and never had problem.Made hundreds of runs . The TA/D crew I am working with back it down every time its fired  .Hey can't see that it can hurt anything.

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