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Posted: Sun Dec 19, 2010 11:22 pm
by chauzer
poor builds have nothing to do with cooling issues. with big horsepower comes big heat. ever see the heat exchangers on a big offshore sportfishing boat? those diesels are stock, putting out 16 to 2400 horse apiece!
Posted: Mon Dec 20, 2010 2:01 am
by alexander38
Not going to try to talk you out doin your deal, but setting right next to me in my marina is a C.C. Catalina 38 with 502's made up with all the go fast up-grade this and that. It left the pier two times this season and 3 last and was back with in an hr every time with an engine down from heat or gas trouble. And yes been there done that with cars 71 Chevelle with a 383 small block that got hot setting more than 10 mins. Well that's my 2 cents. Have fun doing it and please keep us up to date.
Posted: Mon Dec 20, 2010 6:18 am
by Allen Sr
Posted: Mon Dec 20, 2010 9:53 am
by fastestonehere
prowlersfish wrote:A race car that runs the 1/4 mile has nothing to do with a boat engine the runs under high load for hours . Air flow and shroud's have nothing to do with cooling a boat engine . the size of the heat exchanger is the key ( and a water pump to match . yours is made for a stock engine . won't cut it on a built engine.
I seen this time and time again , you'll spend more time fixing it then using it . The people I have seen go this road end up going back to stock or just let it sit . Most the folks have done well doing cars but do not understand boats are a different ball game ..
BTW Those big carburetors are marine right ?
yes marine carbs! i am aware of the custom ground cam on a reverse rotation motor. direct drive gear, rev. dist.gear. bla. bla. bla.. this is the easy stuff. heat exchangers and water pump will be delt with as everything else along with this build.
the reference to my drag car was only for why my user name is what it is.. nothing more.
also The reverse rotation motor will need a custom camshaft
Posted: Mon Dec 20, 2010 12:02 pm
by prowlersfish
If the cam is direct drive ( no chain )( 2 gear ) you don't use a rev. dist.gear.bla. bla. bla
Posted: Mon Dec 20, 2010 12:16 pm
by S.A.M.
Hey guys,
I think it's time to agree to disagree and move on.
Posted: Mon Dec 20, 2010 1:17 pm
by Paul
I don't know how the extra power will affect a 10M Trojan but I found it to be both good and bad on my F- Series hull. The additional torque is is great when in rough water or getting a heavy load up on plane. The extra top end however does not agree with the modified V hull and I find that it gets a little squirrelly to handle.
Posted: Mon Dec 20, 2010 4:08 pm
by RWS
Cars and trucks are not running up a steep hill at 3500 RPM CONSTANTLY.
The rules you are familiar with on the strip and at the track simply do not apply in a marine engine, drive line and propulsion system.
The engine does not push the boat, the propellers do.
In addition to all that, you can ONLY use a marine carburetor and ignition system if you do not want to go BOOM.
Don't you think it would be a good idea to completely research this before you start with the stroke and bore ?
RWS
Posted: Mon Dec 20, 2010 4:22 pm
by chauzer
S.A.M. wrote:Hey guys,
I think it's time to agree to disagree and move on.
i thought we were taking a page from THT web site where EVERYTHING get beat to death!!
Posted: Mon Dec 20, 2010 6:59 pm
by prowlersfish
S.A.M. wrote:Hey guys,
I think it's time to agree to disagree and move on.
Just try to save someone from a $$$$$$ mistake , I will keep doing so
You don't have to read it .
Posted: Mon Dec 20, 2010 7:04 pm
by captainmaniac
Any 10M owners know if the hull and stringer structure was designed to handle the 600HP a side he is talking about here? Engine reliability could be one victim of aiming too high, but I would also wonder about fundamental structural integrity. The boat was designed with a specific purpose, speed, and power range in mind.
Posted: Mon Dec 20, 2010 7:13 pm
by fastestonehere
Paul wrote:I don't know how the extra power will affect a 10M Trojan but I found it to be both good and bad on my F- Series hull. The additional torque is is great when in rough water or getting a heavy load up on plane. The extra top end however does not agree with the modified V hull and I find that it gets a little squirrelly to handle.
Thank you for the help. Guys i am not trying to upset or argue with any body i just thought i would test the waters and see your sides.
the Carb , ignition system incl. dist, alt. starter , and fuel pump dump are all MARINE grade also flame aresters and the check valve in fuel tank pickup.
so it is safe to say no one here would stroke these out and just rebuild them back O.E.
Thanks just looking for some insight. i will keep you posted on the progress if interested.
Posted: Mon Dec 20, 2010 8:23 pm
by RWS
You would probably do far better by going to a pair of 370 - 400 hp lightweight diesels.
If you are genuinely serious about your goals, this is the only realistic method of getting there.
The short lifespan, subsequent problems and termination of production for the 502 is proof positive of the limitations for this basic design.
The 454 Crusader can be reasonably bullet proof however increasing compression in a marine duty application creates stresses that may ultamately result in a cascade of problems.
Take a look at the Yanmar LY series. I looked at them and they would meet the height constraint of my 1983 10 meter express cruiser.
I believe they go from 370 to 440 or so horse. The additional torque will provide increased lift and make that boat run out as it should.
Good luck with your research.
A $25 membership at BoatDiesel.com would enable you to get input on your bore/stroke concept from marine engine professionals with far greater experience than some of us here on this forum.
RWS
RWS
Posted: Mon Dec 20, 2010 8:45 pm
by prowlersfish
Althou I would stay stock beefing it up a little could work out . Just not 500-600 hp , IMO its the wrong boat , It was not made to be a go fast. Its not a Donzi , But it is a great cruising boat
Posted: Tue Dec 21, 2010 10:36 am
by S.A.M.
prowlersfish wrote:S.A.M. wrote:Hey guys,
I think it's time to agree to disagree and move on.
Just try to save someone from a $$$$$$ mistake , I will keep doing so
You don't have to read it .
Now that I've been scolded, I'll go to my room.
