I would set total at 34*, peak performance would be 36*, but 34* leaves you room for error, and fuel quality. Depending on your throttle setting, your timing should be all the way in by 2300 or so. If it takes 1/2 throttle to get 2300, you may have to back it off some. The timing on this 360 is full advance by 2000, and it runs 2K with the throttle barely open in gear.
On Sep 15, 8:07 am, Marc Rovner <[email protected]> wrote: > Hi, my response took a while as I had to do surgery on my macbook. I > have a single 318. I am not sure where exactly the difference in > performance comes from. When i bought the boat I figured I made the > biggest mistake ever. Max 10 knots, engine sounded like it wanted to > detonate, wiring was haywire etc. Currently she purrs at anything up > to 3800rpm (never gone full throttle) and really does get the numbers > I posted (mph not knots had gps set wrong and left it that way). > Can anyone please give me an idea as to total timing at what rpm, I > finally realized that the middle of the range spring on the > aftermarket distributors is way too stiff. I figure all in should be > around 2200 - 2400rpm so you need the lightest spring possible. Any > one have a thought on plugs - ngk vs' whatever and what plug number. I > must admit having spent some time cursing and then tweaking the 318 I > now think it is exceptional. It just purrs at the 550rpm idle and will > even go down to 450 and be so smooth (yes, still has good oil > pressure). Any tuning/performance thoughts greatly appreciated. > > On 2009-09-11, at 9:49 AM, e b wrote: > > > Hi, > > > I was asking Mark if his boat had single or twin engines since his > > numbers differed so much from yours and seemed unrealistic for a > > single engine boat... > > "cupping " a prop is giving a little flare to the edge of the prop > > and acts like having extra pitch, as far as speed, a boats > > efficiency is best at or bellow hull speed, since you had a small > > boat you could feel that bellow lets say 5 knots, the boat moved > > very easily, but to get up on plane you had to gas it, the boats > > stern would go down and kind of dig in untill you gave it enough > > power to climb on top of the water and break free... basically what > > is happening is that as you go faster, the water does not have time > > to fill the hole the boat has created, so the boat kind of sinks in > > the hole unless you have enough power to break free and plane above > > the water. > > the theory is 1.37 X square root of the water line length = your > > hull speed. > > most power boats are planning or semi planning hulls, most sailboats > > are displacement hulls, you can put 1000 hp in a 30 ft sailboat and > > all it will do is create a big hole it keeps on trying to get out > > of... > > if your water line length is 24ft, your hull speed is 6.7 knots... > > to adapt to marine use, you will need a SAE bell housing, I believe > > cummins uses a #2 on their engines, fairly readily availlable at > > semi wrecking yards, the bell housing off a 4bt works as well, a lot > > of industrial equipment like gradals, skytrax and extended reach > > fork lifts use 4bt's. > > I do believe someone make an adapter to use the dodge bell housing... > > Eric > > > ----- Original Message ----- > > From: dodgetkboy78 > > To: UnifliteWorld > > Sent: Friday, September 11, 2009 8:45 AM > > Subject: [UnifliteWorld] Re: Prop pitch, GPH, cruising speed, RPM > > > Sorry, it is a single 360. > > > Also, since it sounds like there is a ton of chrysler marine > > experience here........... (I am a chrysler guru, but this is the > > first marine engine I have ever messed with) > > > This 360 has heavy cast iron rockers, is that a marine thing? (Ticks > > like a mech cam too, I haven't opened up a cover to see if it does > > have one, or has lifter/adjustment issues) > > It also has a single plane intake, I think it came off of the 318, > > (Which has different port size in the auto world). The manifold looks > > like the 2bbl single plane on the 215hp 318's, and just like the 273 > > manifold. It is on the 360 now. > > > Is 7-8kts a good speed? I am happy with it, I just was wondering if it > > was supposed to be a slow boat, or it was because it is under power. > > Last boat was a 1976 Bayliner 22', with one of those little inline > > volvo AQ170hp engines, it ran like stink, 14-16kts, and it took more > > power to run at 7kts. But it was too small, took rough water like > > crap, and was a Bayliner. I go out in the Prince William Sound, so > > choppy water is normal, and it is nothing for 6'-8'ers to come up in > > the middle of the trip. > > > What is "Cupping"? I am new to boats this small, also, another inch on > > the pitch I too think would make a difference. > > > The main issue I have with running it 3300, is the 4bbls are kicked > > in, and it seems to be burning about 12gph. I am getting about 1/2 > > gallon per mile at 7kts. > > > As far as the cummins, my truck has a 350-375HP tweaked VE pump > > cummins, I just wonder how the bellhousing/transmission thing will > > work. I guess find a twin disc from a yacht re-power? Being a trailer > > boat, I cant run a huge prop. > > > Picture: > > http://s12.photobucket.com/albums/a227/dodgetkboy78/?action=view&curr... --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "UnifliteWorld" group. 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