BTW, in order to match the block to the new crankcase and wind up with the crank bore being round and sized right I did the bore on a DeVlieg jig mill. Yours being 50% longer will be a little tougher. I could be wrong but I think when the engineering guys see what you are asking they won't be...
No cooling mods at all. In fact the one to one gear case off a 45SS johnson race engine (stronger than the "D" Merc) had such a big water pump in it the engine wouldn't warm up so I had to re-route some of the water back to the river to get sensible engine temp. I really hope you aren't planning...
I'm an old school machinist, sine plates, rotary tables and such. When I was buying my first Hurco machining center when the owner of the shop I was dealing with stepped away, I asked the twenty some year old operator how difficult it was to learn how to operate it. He said he could teach a...
Not the perfect engine for adding HP. The long somewhat frail crankshaft I feel was at the edge in stock form. Either a V-4 or V-6 is a much stronger unit. The small inline four cylinder Merc thast I used had the front half of the motor (crankcase) that supported the crank and took a lot of...
When I told a motorcyle dealer that had a turbo on his bike, that I made OVER double hp at 14.7 psi boost he sneered and said I broke the laws of physics. I told him to visulize a 500 ci engine with a small lawn motor carb on it that would be running in a very high vacuum and making very little...
I'll find the Haltech in a day or so and give you the model, I bought it from Tom Earhart out of Gun Lake MI. He would be the guy for questions about it. What were you running the 750cc triple in? The 700cc snowmobile I have with a turbo was in a multi-state grass drag and was running the...
FWIW, I bought a Haltech electronic fuel injection system for my Mercury outboard. I had the dealer come over and he had me bring it up to various rpm's under full load on my dyno while he monitored his instruments and set up the fuel curve. $1000 system (still have it, anybody interested?) With...
I read it and it looks like they are blowing through the original carbs. The picture wasn't clear enough to see if they had a way to pressurize the float bowls with boost pressure. If they weren't they would get bad results.
With increased engine capacity comes increased weight, I guess my experiences have been getting the maximum performance from the smallest, lightest engines and the concept of fuel efficiency has never been important.
I'm assuming you are talking about efficiency such as gas mileage? In the performance world getting the max hp out of a certain cu in engine is the bottom line. The ultimate example could be a top fueler that consumes ten gallons of fuel in a quarter mile. My 44 cu in engine at 14.7 lbs of boost...
Luth asked;
you had problems to start the engine in the draw through config?
At first I was using a rope start on the outboard and due to the long path from carb to crankcase, it took a little experience to start at times. Going to electric start eliminated all starting issues.
Baluncore, most engines that have been proven over time are easily capable of much more hp than they produce in stock form. My Mercury would run almost forever at stock 40 hp. I have seen over 100 and the failure was detonation which could have been remedied by a slightly higher octane fuel.
There is another plus when turbo'ing a two stroke. Before I installed the turbo, I put a small reed valve on the outside of the crankcase under a small cavity. This is the way outboard motors used to pressurize the fuel tanks to get around needing a fuel pump. I was curious how much crankcase...