Originally Posted by bunker7
Bought a turbo with a 1 year warranty, no core charge From superior turbo in Detroit. 1700.00 !!!!!!its in the mail.
They mill out the housing to accept a Borg Warner cartridge.
Good info. I'm curious if the old turbine section was damaged such that it couldn't be reused? Air Research, right?
By the way, a couple of other spares I'd recommend is either an engine water pump (different than the truck engine) or a rebuild kit, and probably a fuel shut off solenoid. I also carry a spare starter, but it's a very common item.
I believed some of the phony balony dock talk about these engines ten years ago when I bought the boat (over one with Volvos) and started gathering parts. No turbo as yet, but I have a magnifluxed and decked block, set of heads, new cam, all the bearings, solenoids, turbo pistons/rings, gaskets...on and on. And in ten years I have replaced absolutely nothing on the engines except belts and some hoses. Absolute gems. Even bought the rack setting tool...looks like for no reason. By the way, MESA in Birmingham make new exhaust manifolds...stupid expensive, but available.
Back when I was shopping for a boat, I contacted Johnson and Towers who had marinized the engine in our boat. Spoke with one of the old engineers who worked the project back in the 80s. He took me through the variants and changes to the engine as they worked their way up in power. Based on that info, I've often thought about downsizing the injectors to the 220 HP size, as that's the only change from 220 to 250HP. he JT engineer said if an engine with the larger bolts didn't blow up in the first few hours...it wasn't going to (speaking of the 250).
The engines do tend to "load up" when running for hours at 8.4 knots. Thinking maybe a slightly small injector would help a little. That said, they start and run so well that I hate to mess with them. Guess I'll just keep running them up to 2500 for 5-10 minutes every couple of hours...definitely cleans up the exhaust. I've noticed that they run at about 165-170 degrees at slow cruise, and then heat up to 180-185 at 2500 with a load.
The "fuel pincher" moniker is well founded in my experienced. By the way, the folks at JT sent me their prop curves for the engine, which have proven to be quite accurate. Transmissions in our boat are MG502s with 2:1 ratio.
Love the engines...great V8 exhaust growl. Thank goodness I didn't buy one with Volvos or even 3208s.
PM me if you want to compare notes. Thank you and mbevins for the info on the turbos.