4 stroke Turbo Jet Drive, for more fun than functionality

Hello, as the name states, I do thrive on impractical, cool factor ideas and modifications. So please bare with me, I understand that my desires impact reliability of bulletproof motors.

I have been wanting to turbo my 115/80 Yamaha Jet drive engine.

Efforts of researching the interweb have been futile. So for starters, I have not gotten into the fine details of size of turbo or tuning, I only have the concept roughed out.

My questions are primarily about cooling. Ive seen recently thay Prodrive outboard, and Freedom outboards, have come up with a closed loop cooling system, but both rely on the heat exchangers being in the water. The rivers I run in Montana are significantly different from the mud they run down south with the bottom being primarily rocks. I understand the Keel Cooler method is rugged, but I would like to avoid that route altogether.

I'm well versed in custom fabrication, and really am not worried about having to modify the cowl.

Would it be possible to modify my Yamaha to a closed cooling system, but incorporate a air cooled heat exchanger, a radiator, and an electric fan. Mount it on the stern side of the block, include an expansion chamber somewhere in the mix, and do away with the exhaust cooling aspect of it.

Make a custom exhaust manifold thst has a turbo pedestal, run the plumbing like a normal small car engine for example.

I understand that automotive engines do not run at full load constantly like an outboard does, but stationary generator engines, and pumps do.

Thank you in advance for the input.

 

Welcome .
Why do you need expansion chamber ? You mean expansion chambers like two strokes has ?
If you want stick with open circuit cooling probably best way is use water cooled turbo and custom water cooled exhaust.
regards

 

Thanks for the reply.

I'm looking more towards a closed loop system, and in regards to a expansion chamber, I made a mistake and was referring to an expansion reservior.

So basically an automotive setup, on a 4 stroke outboard.

 

I found a couple pictures of a turboed 2 stroke, apparently its a Johnson, but the pictures are more what I'm looking to do, design wise.