The Ford Barn

gavinnz · 04-20-2019, 06:43 AM

Had to much time to think today....
Thinking about if I am going to really need two carbs on the boat motor....
With the 0.125 over bore on the 8BA block I will be about 4.2 litres... Bigger than the long stroke Merc that was rated at 125hp which is more than boats this size had in the 1930's...

Spec plan would be.....
4.2 litres.
After big pistons, Canadian heads and a head skim I will have 8.0:1 ish compression.
Might even just run the 8mm lift 8BA cam...
Simple cleaning up of the ports and careful matching of manifold.
Better electronic ignition inside a divers helmet dizzy.

Thinking about one 1 1/16 dual throat Holley 94 carb, which I now have to hand.

In a petrol powered boat fuel leaks can be dangerous so on less chance of that is good... Less "BOOM"!
The boat is only 16 feet long wooden 1930's two seater.... Some engines supplied for boats of the same size and style build in the 1930's had 95hp engines.... The high performance option was 125hp.

I might have a 1935 manifold lined up... (Thanks Brian!)

Thoughts?

04-20-2019, 06:43 AM	#1
gavinnz Senior Member Join Date: Feb 2019 Location: New Zealand Posts: 208	Do I really "need" twin carbs???? Had to much time to think today.... Thinking about if I am going to really need two carbs on the boat motor.... With the 0.125 over bore on the 8BA block I will be about 4.2 litres... Bigger than the long stroke Merc that was rated at 125hp which is more than boats this size had in the 1930's... Spec plan would be..... 4.2 litres. After big pistons, Canadian heads and a head skim I will have 8.0:1 ish compression. Might even just run the 8mm lift 8BA cam... Simple cleaning up of the ports and careful matching of manifold. Better electronic ignition inside a divers helmet dizzy. Thinking about one 1 1/16 dual throat Holley 94 carb, which I now have to hand. In a petrol powered boat fuel leaks can be dangerous so on less chance of that is good... Less "BOOM"! The boat is only 16 feet long wooden 1930's two seater.... Some engines supplied for boats of the same size and style build in the 1930's had 95hp engines.... The high performance option was 125hp. I might have a 1935 manifold lined up... (Thanks Brian!) Thoughts?