SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: doug olah on May 17, 2016, 07:56:44 AM
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Hi , I'm new to current jet boats. I had a couple in the 70"S but need your imput on current engine choices. We bought a 1985 taylor with a 454 CI with a dominator pump. Took it out but sucked a valve. Need new short block. Do I need a marine short block? not looking to race but want decent power, running msd, air gap oval intake and 800cfm.Any suggestions?
thanks
Doug
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No way!!! A chevy blew up?!! I am suuuuper surprised. Lol
Lots of options. Someone on here could have something that could help out. Or you can go the short block route but you need to make sure it is set up for marine specs. The pros will chime in.
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thanks need to know more about marine applications.
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Anybody recommend a supplier for a short block with large oval intake ports? thanks
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Anybody recommend a supplier for a short block with large oval intake ports? thanks
So... a long block?
GM crate motor is an option.
A used/take out motor?
How bad is your motor? salvageable?
Whats your goals?- stock? performance? race?
Oh, and budget?
Its really easy to spend other peoples' money...
Dan'l
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HI Dan'l
motor is shot need long block. Performance goal, large oval ports. I run a 468 in a 68 vette with aluminum heads which works great. Whats your opinion of aluminum heads for the boat engine? thanks and by the way thanks again for your imput on removing the engine came right out.
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HI Dan'l
motor is shot need long block. Performance goal, large oval ports. I run a 468 in a 68 vette with aluminum heads which works great. Whats your opinion of aluminum heads for the boat engine? thanks and by the way thanks again for your imput on removing the engine came right out.
Aluminum heads- I run 'em on 2 diff boats.
ZZ454, 440 hp. GM crate motor
or collect parts to build ya one.
454 HO was the model/build sheet for mine.
Dan'l
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I don't recommend a "reman" or even a "new" crate engine for a marine application with an open cooling system, unless it was built specifically for that purpose.
You would probably be money ahead by going to a competent machine shop and having it built for what you want to achieve.
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thank you crewchief22
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The single largest differences between a marine engine and the car are machining clearances, cam grind depending on what exhaust and materials used in head gaskets and freeze plugs.
Brass plugs and Marine head gaskets are a pretty big deal if the boat spends lot of time on the water, to control electrolysis.
A machine shop familiar with the added clearances needed on a marine engine should be able to get you going on the right direction.
Depending on what you intend to do to the engine, the clearances will be somewhat of a moving target.
RPM, HP, how long it will run hard, exhaust system, fuel used, compression ratio all pretty much come into play in a small part.
I like forged internals for an all out performance engine. I would not turn cast pistons past 4,800rpm. Forged crank is optional to an extent, I use 500 horse as a guidline. Four bolt block after you touch 600 plus.
JMO based on my experience and the stories of others.
The reason for the added clearances is the extreme temperature differences seen with open cooling, these engines rarely run warmer than 140°F with very cold entering water.
Good luck, sorry for your troubles.
GT
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No way!!! A chevy blew up?!! I am suuuuper surprised. Lol
Me too..........
Normally we hear about a Ford crapping itself.
Weird.
Must have been a 30 year old build.
GT
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Me too..........
Normally we hear about a Ford crapping itself
GT
No kidding!! My last one looked like a grenade went off inside it. But dont you worry, my blue oval is waiting for you. For as long as it can last. Lol
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No kidding!! My last one looked like a grenade went off inside it. But dont you worry, my blue oval is waiting for you. For as long as it can last. Lol
On a ford, they call that an oil change.....
Anything that got touched by oil...needs to be changed...
Dan'l
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On a ford, they call that an oil change.....
Anything that got touched by oil...needs to be changed...
Dan'l
Lol. Ironically I am doin an oil change before memorial weekend festivities.
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Some people are really hard on Ford's around here
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Some people are really hard on Ford's around here
Bunch of jerks!!! So insensitive!
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I like my Ford
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I like my fords too