Technical > Matt Shaff's Engine Shop

Balancer spec

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ss4:
Looking through the NHRA spec and there is a requirement for the balancer to be SFI rated 18.1 mandatory.  So what happens If I don't have a balancer.  since my motor was in a sprint car it is setup with a KSE gear drive and the crank snout drove a water pump.  I am not running pump so I just blocked off the adapter and run it like that.  Will I have a problem with Tech on this.

ricardo1967:
Good question, I'm all ears for what the pros have to say. My understanding is that the damper spec exists to prevent damper explosion or a runaway damper (or outer ring). Many blown engines don't use damper at all.

ss4:
I would expect it just won't apply, but a good friend of mine had to put a battery disconnect on his fed to satisfy the tech guy "because the rules said you had to have one" even though he didn't have a battery on the car.

dreracecar:
A "HUB" is not a balencer so SFI spec is not required.  As to the battery discconnect, some of these Tech people are worse than NFL refs

ss4:
good point on the balancer, Bruce.  Should I have a mag shut off on the back?

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