Quincy Racing Deflector, D Mod Mercury Mark 55

**Hydro200merc** · 11-19-2017, 12:35 PM

https://www.ebay.com/itm/132403128506

I have talked to Paul Christner, of the Quincy Racing family, and he has authenticated the motor in the photos as one of there Deflector race engines.

**Dave S** · 11-21-2017, 05:42 PM

Real Real Real early mk 55 block.... no oil lines..... nice deal if ya wants......worth $2000 IN THE OLD.....DAZYS.

**olboatman** · 11-21-2017, 09:27 PM

That is a jewel!!!!

Love (miss) the great howl they make.....couldn't get enough of it when I was a kid.

Did I ever grow up?

Gary

**Mark75H** · 11-23-2017, 08:31 AM

8400 rpm

**FMP** · 11-23-2017, 08:36 AM

head padded to increase compression

anyone know that process
If not blind then much easier but is it built up weld and worked to shape?

**olboatman** · 11-23-2017, 08:38 AM

Originally Posted by Mark75H

8400 rpm

Is that as high as they spun merc 4 cyls?
Gary

**Mark75H** · 11-23-2017, 07:02 PM

8,400 is like a brick wall for rpm of the 4's; just about everyone spins that fast except for correctly modified 30 cubic inch 4's

**Mark75H** · 11-23-2017, 07:05 PM

Originally Posted by FMP

head padded to increase compression

anyone know that process
If not blind then much easier but is it built up weld and worked to shape?

The pads are welded in from the back, thru holes drilled to let the welder start at the back of the pad. A large fixture jig slug holds them in correct position so the piston won't hit them.

**FMP** · 11-23-2017, 07:14 PM

I thought something like that. Could you do it to a inline Merc?

**Mark75H** · 11-23-2017, 08:16 PM

I am sure you could, but they are already at the verge of detonation on most boats and while they were in production Merc advised reducing the timing advance from 27° to 21°. You would have to run $8 to $20 a gallon race gas or methanol.