A-4 inboard project completed

[Hymodyne]

I have always disliked the presence of the outboard kicker on our Dory, so last winter I found an early model Atomic 4 inboard. here it is with the gauges, exhaust and water to test the engine. It was a freshwater engine from lake Michigan


For the final drive I installed an offset 3/4" propeller shaft and folding propeller:

I used insulated pieces of epoxy-covered 1/2" plywood for the side, top and front of the engine compartment:


throttle and choke are on the left.


She's been winterized, so this spring, we'll paint and prep to splash on the Nanticoke from Cedar Hill Marina.

James

[Russell]

Wow, ambitious project! Atomic 4s are great engines, I had one in a previous boat. In a CD22 you certainly will have plenty of reserve power!

[pete faga]

Good luck with your launch this spring. I would guess this is a first inboard repowering on a 22.
Please post more pictures on this conversion when you get a chance.
How many trips to the chriopractor during installation?
Pete

[Hymodyne]

I went ahead and repainted the cockpit and tried out the Rustoleum marine paint and non skid now available at Lowes:


The battery space provided just enough space for the install and compartment:


I laminated pieces of 1/2 " plywood together with West Marine epoxy then covered the rails with heavy woven fiberglass cloth and epoxy resin. The engine mounts are from a PWC. Additional pieces of hardwood were placed underneath the fiberglass deck of the battery location to secure the L brackets and wood screws that were holding the rails in place. Lots of put the engine in place, take it back out and measure, adjust to get the rails cut the a proper angle to give the propshaft the correct path out to the keel.


Backing plate and valve for raw water intake


here is the hot section of the exhaust and the propshaft outer tube. The water lift muffler pictured is mounted on the opposite side beneath the seat. after the riser section pictured, the black iron pipe runs across and beneath the cockpit floor, connects to the water lift muffler, which finishes with a section of wet exhaust hose that exits the transon through flap covered through hull.


James

[Zeida]

W O W !!!! CONGRATULATIONS!

[Gary H]

After seeing this, I will never take the engine in my 22D for granted. Amazing job.

[Hymodyne]

A few more pictures of the project. Mock-up propeller shaft (3/4" steel tube with 5/8" steel rod inside) and mock cutless, a piece of pvc, allowed me to position and finalize the propeller shaft and housing construction long before I got the 3/4" cutless for the keyed stainless shaft. A special drive washer was created at my local machine shop so the shaft would work with the folding propeller. The shaft housing is 6 or so different applications of fiberglass cloth and mat and epoxy and polyvinyl resin. over two sheathed strand fiberglass tubes, with an I.D of 7/8" and a final O.D of 2 1/4"


Intake and exhaust vents are seated on 3/4" teak bases. The blower is directly below at the bottom of the rear storage space. 3" hoses are routed to leave space for the 11 gallon tank and fuel hoses.


Modified for use as a fuel tank vent; stainless mesh on top and a brass barbed nipple for the hose coming from the tank.



James