I have a 27 express cruiser with a single 250 hp 5.9 cummins, im trying to
compare performance, at 2400 rpm im cruising at 20 , have a hurth hsw 630 1.5:1
and running a 19X19 prop... anything comparable out there...
eric
----- Original Message -----
From: john hamilton<mailto:[email protected]>
To: [email protected]<mailto:[email protected]>
Sent: Wednesday, October 14, 2009 12:01 AM
Subject: [UnifliteWorld] Re: Broken Crank Chrysler 360
The cranks are the same. I happen to have one in my garage that could
be used with a bit of machine work. It came out of the same reverse rotation
marine 360 engine that you have. I blew my 360 about 60nm from home and made
it on a 9.9 Yamaha with the identical boat. Averaged about 3.75 knots. LONG
trip.. I now have a 30hp Tohatsu as an auxiliary that makes about 6 knots.
Should be more than that but it doesn't have an optimum gear ratio and prop for
the boat. A Merc 25 or 50 Big Foot would be ideal as an auxiliary for that
boat, as would a Yamaha high thrust. I use it a lot when running at night so
that I'm not tempted to go too fast and hit something (like the whales that
keep appearing out of nowhere and scaring the #%$% out of me).
The problem would not be the wrong flywheel, the whole boat would
vibrate like crazy if you started a 360 with a 318 flywheel on it. I did the
same thing 25 years ago by putting a 350 flywheel on a small block 400 Chevy.
Interesting learning experience and I've stayed away from Chevy's since then.
Foolish reaction, the problem was the mechanic, not the brand.
I also bought a reman reverse rotation marine 360 long block once. I
got it and thought it looked a bit strange so I got out my ruler and measured
the intake ports. The bustards put a 318 head on one side and a 360 head on
the other! They made good on the mismatched heads but the engine didn't last
long. The second time I rebuilt it myself so that I would know exactly what I
had.
I used an Eagle 4 inch cast steel crank with Eagle rods and .040 over
KB quench dome pistons. I have a custom camshaft. Cruising speed is 15-20
knots at 3000-3500 rpm. Top end is around 30 knots at 5000.. The engine is
modified but none of the parts are real high performance pieces, just picked
for producing maximum torque between 2500 and 3500 rpm. I'm using a Hurth 630A
down angle transmission with a 1.5/1 ratio, and a 16x16 NiBral prop.
My boat's original setup was a stock 318 with a Borg Warner 71C
transmission with the same 1.5/1 ratio and (I think) a 16x12 prop. A previous
owner put in a 360 and changed the prop to a 16x14 before I bought it. Any
crank that will fit a Chrysler 360 will work in your engine, including stroker
cranks from multiple sources. I put mine together as an internally balanced
engine like the 318.
When you go to rebuild it, you might want to think ahead about what you
want to end up with. Reverse rotation Chrysler marine camshafts are getting
pretty old and hard to find. They're out there, but nobody is making any new
ones so the supply is what it is. That limits the potential of what you can
do. I changed the rotation of my engine so that I would have more options. I
should have done it sooner. Lots more options out there for standard rotation
LA engines. Since you have a Dodge truck and you've mentioned a 390 crank kit
in the past, I assume you've heard of Hughes Engines? They put together my 410
crank kit and custom ground a camshaft for me. They've got lots of customers
with Marine engines. I'm tickled pink with them, their products and their
customer service after the sale.
Good luck with your winter project! I've got lots of info if you want
to exchange it. I'm exactly one year ahead of where you are right now. This
season with the new engine was awesome!
John
--- On Tue, 10/13/09, dodgetkboy78 <[email protected]>
wrote:
From: dodgetkboy78 <[email protected]>
Subject: [UnifliteWorld] Broken Crank Chrysler 360
To: "UnifliteWorld" <[email protected]>
Date: Tuesday, October 13, 2009, 5:35 PM
So, did you guys know you can make it home in 5' seas with a Honda 8HP
kicker? Average speed of 3KTS? In a 27' hardtop express?
Yyyyyep, you can.
First major failure I have ever had with a Chrysler small block, ever.
Anyway, I have put about 45 hours on my boat since I got it this
fall, and it has ran like a top. Until Friday. I was cruising along,
about 9KTS, at 2600rpm, in a 5-6' following sea, and all hell broke
loose. It seems the crank broke somewhere between the first rod
journals and the flange. The motor spins from the front, and the
flywheel spins free from the back.
Is this a popular thing? Anyone had it happen before? The owner before
me paid big bucks to have a rebuilt marine 360 installed in the place
of a 318. Because the 318 is internal balance, and the 360 is
external, I wonder if the weighted flywheel was put on the back of the
360.
Any place to get a good crank? This happens to be a single screw right
hand (Backwards) engine. Are the cranks the same?
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