2 stroke comeback.

[Jeff B]

What's the compression ratio on these things? Can you get revised bits to alter CR, pistons, or reed valves, etc?

I'm not entirely sure of the compression ratios but it's on the high side on this particular engine (225hp) it's the gruntier model of this engine size family, 150, 175, 200, 225 all have same 2.6 litre capacity.  I will check compression after I fry the first piston.
This actually has a fancy ecu and knock sensor so pulls timing back if I put crappy octane petrol.in it and it pings.

[Jimmy Jet]

Looking good. Its going to be a fun boat!
Who do you use to source the silicon exhaust bends? WAM brand?

[Jeff B]

Looking good. Its going to be a fun boat!
Who do you use to source the silicon exhaust bends? WAM brand?

It's a local shop.
"Hose shop" or something? Used to be called United flexible, they have shops in a few towns in NZ. Do hydraulic hose and all sorts.

[Ross Goldsack - JBNZ Immediate Past President]

Is it called Pipeline?

[mohawk]

Is it called Pipeline?

yup

[Kakapo76]

I'm thinking that WOT will be sucking close to 100 litres/hour?
Cruise 25 litres/hour?
Its 2.6 litre and most of the fuel/oil will blow straight out the exhaust, some will get turned into noise and heat...
What's left will turn the jet unit and hopefully make enough thrust to have some fun.

My 250 EFI Mercury (litre block) burns 156 litres per hour WOT- they love the dino juice no doubt.

[Jeff B]

Reverse fitted. Keeping it light and strong. Locks over centre so no chance of bucket falling down.

[Jeff B]

Making engine cover. 2.5mm, couple folds to match foredeck and stiffen it up a bit. Light and strong...
Gotta keep an eye on weight to keep to my goal of 1.5kg/hp ratio.

[Ross Goldsack - JBNZ Immediate Past President]

I like it, very nice proportions for a wee boat.
Smooth
Silky
Sleek
Nothing like the engine......

[Warwick Marflitt]

It's a local shop.
"Hose shop" or something? Used to be called United flexible, they have shops in a few towns in NZ. Do hydraulic hose and all sorts.

http://hoseshop.co.nz/our-products

Select from products in the left hand margin

[Jeff B]

I like to think of this build as comparable to the "CR500" of jet boats. 

[quattro]

Will you be doing any port work on it? I don't know how much power people get out of those engines but a guy I know in the states has a 3.3l omc v6 making 400hp. Would give a very good pwer to weight ratio

[Jeff B]

Will you be doing any port work on it? I don't know how much power people get out of those engines but a guy I know in the states has a 3.3l omc v6 making 400hp. Would give a very good pwer to weight ratio

I'm not planning on porting it. Partly because I don't really know what I'm doing and partly because it will likely turn something that is terribly inefficient into something that is truly horribly inefficient...
I have some valuable knowledge from guys that have raced these engines as outboards but I'm still not sure how my pump will match the power curve yet. 

[Jeff B]

Hull finished welded up.
Hook up some hoses, cables and wires and it will be ready to rumble.

[Markg]

  A lot of people watching this one.Almost as fuel efficient as the turbine build.