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Cam regrind

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Arnold Cunningham

Original Poster:

737 posts

174 months

Sunday 10th September
quotequote all
Another post gone! lol

Mine's a 556 cu motor with Airflow Research 315cc CNC anodised heads on a 4.375 stroke & 4.5" bore. Hilborn mechanical intake converted to EFI with hidden injectors. Designed to produce more than 600hp at less than 6K rpm, but also have a gob of torque since it's a marine engine and therefore doesn't have a gearbox.

Edited by Arnold Cunningham on Sunday 10th September 16:29

Boosted LS1

16,340 posts

181 months

Sunday 10th September
quotequote all
Arnold Cunningham said:
Another post gone! lol

Mine's a 556 cu motor with Airflow Research 315cc CNC anodised heads on a 4.375 stroke & 4.5" bore. Hilborn mechanical intake converted to EFI with hidden injectors. Designed to produce more than 600hp at less than 6K rpm, but also have a gob of torque since it's a marine engine and therefore doesn't have a gearbox.

Edited by Arnold Cunningham on Sunday 10th September 16:29
You won't get far without wheels. Are you wakeboarding with it?

Arnold Cunningham

Original Poster:

737 posts

174 months

Sunday 10th September
quotequote all
Being a pedant - as we're on an island and 2/3rd of the world is covered by water, there's more opportunity to go further, as long as I start in the right place. smile

No, not wakeboarding - monoski is more my thing anyway - BTW - look up some of the mental engines the waterski racers run - 1500+ hp in a 24' boat, for example.
However this motor is for a 27' replica of a 1967 race boat I've been building for the last few years. Not enough spare time these days, so it's taking me forever.



Not mine - but you get the idea:


Anyway, a couple of hours in the garage and the cam looks fine again. Thanks Dave.

Edited by Arnold Cunningham on Sunday 10th September 19:26

Boosted LS1

16,340 posts

181 months

Sunday 10th September
quotequote all
Cool. I've built a few marine engines for wakeboarders, Chevy's. Have you a pic of your boat?

Arnold Cunningham

Original Poster:

737 posts

174 months

Sunday 10th September
quotequote all
Yeh, it's all chevrolet (for inboard motors), whether badged as mercruiser, volvo, yamaha etc.

The tech's moved on a bit now - mercury marine now make their own motor from scratch - own block, etc. Up to 1750 hp factory build - but if you have to ask how much, you can't afford it. They put one in an Ultima GTR too, for the launch.

My boat is the same as the orange one - except in white. It'll get some graphics when it's running.
Lots of pics of it, though not so many "overall ones"

Towing it back from sweden where the hull was molded. Think this pic was near Malmo:


Building the structures:


Trial fit of the engine:


Edited by Arnold Cunningham on Sunday 10th September 22:29


Edited by Arnold Cunningham on Sunday 10th September 22:48

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Boosted LS1

16,340 posts

181 months

Monday 11th September
quotequote all
That's going to be fantastic!

Arnold Cunningham

Original Poster:

737 posts

174 months

Monday 11th September
quotequote all
Thanks. I hope so, it's been a lot of work - (re)building the trailer (major replacement of of the frame), lots of glass fibring, building the ECU (megasquirt 2 V3), wiring, building the engine - and so forth.