Front mount blower

[kip305]

In the middle fifties, maybe 56 or 57, someone ran a roadster (?) with blower mounted on the front 90 degrees vertically.  GMC 6-71?

[Glen]

Joe Panak of RotoFaze has  a front mount 6-71 with a over drive he designed and built in his machine shop. It's on the front of a V-12 Cadillac in a 34 Ford coupe.

[Stan Back]

The story I heard was that the dragsters went to top-mounted blowers not for the ability to overdrive them, but for quicker throttle response.  I'm sure someone who knows the inlet speed could prove or disprove this.  Nailing a front-mount from the two to the five wouldn't count here.

[Xoecraft]

  Anyone have any better images of the Drive coupler or details?? Was Tom Cobbs set up the same ?

 Thanks

[Peter Jack]

It's a rather simple 1:1 chain drive as seen in the e-bay ad

Pete

[Anvil*]

If you have room machine a small gearbox you might machine one that will accept quick-change gear pairs. They easily handle the rpm and torque and can be swapped for ratio changes as you tune up.

[Xoecraft]

I like that idea ,,but trying to "recreate" so want to copy how it was done 'then' which seems simple and straight forward,,just wanna make sure to get all the details and fine points

[Glen]

google potvin blower drives, there are pictures of what you want. The crank and blower drives are a sprocket with a double row chain to couple them.

[Xoecraft]

next question ,,I don't see a harmonic balancer in any of the pictures,,what is done to maintain the balance ?

[panic]

Those engines aren't externally balanced.

[RichFox]

Those things are more properly called Harmonic dampeners. And are used to dampen whipping of the crankshaft. Most race engines do not use them for balance, that I know.

[bvillercr]

We use one.

[RichFox]

Me to. Just not for balance.

[Xoecraft]

Those things are more properly called Harmonic dampeners. And are used to dampen whipping of the crankshaft. Most race engines do not use them for balance, that I know.

Thanks I was not aware of that ,,thought it was one of those "must have " things

[desotoman]

Thanks I was not aware of that ,,thought it was one of those "must have " things

If you use a motor that is externally balanced, by the use of a harmonic balancer and flywheel, you must use those two pieces. Only way around it is to have the whole assembly internally balanced which could be very expensive using Mallory metal.

I would recommend using a motor that is internally balanced to keep costs down. Good luck.

Tom G.