Same experience as Turbojack - run them on the edge and watch em go. Just go with the basics of any blown motor - good valves, low compression, moderate boost and they will live a long life.

4 to 6 lbs of boost and they increase power by about 40%. With the right prop up to 25% fuel economy increase at your current cruse speeds. MMoree poer than a blower because there is no drive loss. Engine ssould do well for yeas if you dont push it to far all the time

It is possible to run very low compression and high boost. My static compression ratio is under 7:1 and I'm running over 20# of boost. Engine starts making boost at 1500 rpm's so getting on plane is not a problem. I'm using efi and not a blow through or draw through set up.

Check300 - how bout posting a pic!

Not real pretty but It's all home built.

Check300, are details of your engine project available? It looks like there is no intercooler and it is not a Merc EFI system... How fast will it push the boat? I am considering a similar project on a 283 W/ twins but packaging it may be a challenge.

The intercooler is the round piece on top of the engine. The efi is Big Stuff3. The boat runs in the triple digits. With twins you could use smaller turbos but packaging would still not be easy.

I have two sets of Multiport EFI turbos willing to sell. They come with injectors, fuel rails, computers, 4 turbos using mercruiser exhaust...riser is bolted to the turbo. Intercooled with Paxton fuel pumps and regulators. Only thing missing is edelbrock intakes and some of the wiring was hacked by the previous owner. I'm building a different setup and have decided not to install them. These will fit in twin engine setups, but narrow engine spacing will required an adapter between the inboard turbos to kick them into the center of the motors. Neat setup and would hate to sell them...but no need for them to collect dust. Also come with tall valve covers. This is a PFM setup using shielded garret turbos.

Tom
561-676-8624

Check 300 has an awesome ride, very effective set-up.



Jon

another pic