Dual engine coupling- dont ask why!

[Rusty O'Toole]

This used to be a fairly common thing in drag racing and at Bonneville. It is not too hard to do at home if you have some mechanical savvy.

You couple the engines together with a sprocket on each crankshaft then wrap a piece of double row chain around them. This makes a coupling with a slight degree of flex but very strong.

To build the connecting bellhousing turn 2 bare blocks upside down and connect them by clamping a long pipe or bar in the main bearing saddles. Make 2 steel plates, one on the bellhousing side of the front engine, the other to the front of the rear engine. Weld them together, with plates in between, don't forget you will need a fan belt to drive the rear water pump, unless you can rig up an electric pump, or some other arrangement.

When you put the whole thing together it is wise to put a spare fan belt around the crank, wrap it well and leave it sitting there in case the first fan belt breaks. Otherwise you have to split the engines to put a new one in.