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Engine Placement in Altered/Funny Car Chassis

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captndiet:
How far out and what crankshaft angle/ground clearance are typical for the average altered chassis.

I know many Alky cars have the engine out 67"+ but not sure what crank centerline is, up, zero or down.

The Mark Williams F/C print has the engine out 63" and the centerline at the front of the crank is 10 1/4" from the ground, which would be down in the front. Chassis ground clearance is 3 1/2".

The S&W altered print has the engine out 62 1/4" and centerline at the front of the crank is 13 5/16" from the ground which would be zero. Frame ground clearance is 4 1/2".

Any input is appreciated.

Jeff

rooman:
Jeff,
     what you are planning to run for power and what will transfer that power to the rear end has a lot of influence on the motor location.

Roo

captndiet:
Roo

Initially just a small cubic inch injected alky/auto trans deal.

500-600 hp.

1700 lb.

Solid front & rear suspension.

125" w.b.

1/8 mile car.

Jeff

rooman:
Jeff,
     I would put the motor 65 out and slightly nose down.  The M-W blueprint is very old as evidenced by the fact that 67 out is the norm for a current funny car. I presume that you are planning about a 31" tire from you comment on the S & W print. The S & W print also sounds a little suspect in light of current track preparation standards. Unless your local track is dirt I can't see that you would want the motor that far back and up.

Roo

captndiet:
Roo

Thanks for the input.

I will probably follow your advice.

Jeff

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