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GAWnCA

  • Karma: +1/-1
Engine Prep Difference?
« on: October 04, 2007, 07:13:07 AM »
Now I've got a question and it doesn't concern the engine type or make, so I hope this doesn't become a battle over which engine make is better than the other.

When it comes to boats in general, hot boats to be more specific, when comparing "JET" powered to "V" drive powered motors, is there a difference in the machining processes required?  And, the kind of components that may be installed?  I.E. Heads, pistons, valves, etc.
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Forgive your enemies.  It messes up their heads.

Marcsrollin

  • Karma: +33/-0
Re: Engine Prep Difference?
« Reply #1 on: October 04, 2007, 10:34:52 AM »
The only diffrence other than mounts and water pump would be cam. And the cam would only be if you wanted to fine tune it.
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  • Boat #1: 1978 TX-19 Youngblood
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Ema Non-Performance Marine - BANNED

  • Karma: +18/-1
Re: Engine Prep Difference?
« Reply #2 on: October 04, 2007, 10:40:01 AM »
A marine engine has slightly larger clearances due to the pistons getting hot and the block staying cool.

As far as the V-drive deal your wife will kill you ;D

In most cases a hot jet will not exceed 6,000rpms ut a hot v-drive will spin 7,200 or so. The gears and prop will determan the camshaft used.
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GAWnCA

  • Karma: +1/-1
Re: Engine Prep Difference?
« Reply #3 on: October 04, 2007, 10:50:00 AM »
I hope my wife doesn't find out until it's too late.  :) 
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~Greg
Forgive your enemies.  It messes up their heads.

Luckie Stiff

  • Karma: +29/-0
Re: Engine Prep Difference?
« Reply #4 on: October 04, 2007, 10:57:10 AM »
Quote from: Emanon Performance Marine on October 04, 2007, 10:40:01 AM
A marine engine has slightly larger clearances due to the pistons getting hot and the block staying cool.

How much larger? Only in the bore? What about rod journals and main bearings? I'm getting ready to send my 460
to the machine shop and I want to know what to tell them to do, and what to look for before I pay them for it!
Thanks

Skip
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"Don't you realize that there are already enough people in the world to hate without you putting so much effort into giving me another?"

Cas

Re: Engine Prep Difference?
« Reply #5 on: October 04, 2007, 12:01:01 PM »
Quote from: Luckie Stiff on October 04, 2007, 10:57:10 AM
How much larger? Only in the bore? What about rod journals and main bearings? I'm getting ready to send my 460
to the machine shop and I want to know what to tell them to do, and what to look for before I pay them for it!
Thanks

Skip

bearing clearances should also be a smidge larger (+.0004 or so)or at least on the larger side of the automotive clearance range.  Cars can run the tighter clearances due to them very rarely seeing 3000rpms let alone 5.  Jets, as you know, very rarely go below 3k and often times are above the 4800 to 5k.  Although not completely necessary but a real good set of high performance head gaskets are a good idea....at least that's the way I was taught.
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just squirtin

  • Karma: +1/-0
Re: Engine Prep Difference?
« Reply #6 on: October 04, 2007, 08:59:27 PM »
who is doing your machine work=
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Luckie Stiff

  • Karma: +29/-0
Re: Engine Prep Difference?
« Reply #7 on: October 04, 2007, 09:07:03 PM »
Quote from: just squirtin on October 04, 2007, 08:59:27 PM
who is doing your machine work=

Hopefully Jim Barnes if I stay local with it, do you have any recommendations?
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  • Karma: +51/-0
Re: Engine Prep Difference?
« Reply #8 on: October 05, 2007, 02:06:23 AM »
Quote from: Luckie Stiff on October 04, 2007, 10:57:10 AM
How much larger? Only in the bore? What about rod journals and main bearings? I'm getting ready to send my 460
to the machine shop and I want to know what to tell them to do, and what to look for before I pay them for it!
Thanks

Skip
skip the general rule is .001 for every inch of journal, i will talk to you more about this at the races.
fyi, mine is .003 mains and .0025 rods
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GAWnCA

  • Karma: +1/-1
Re: Engine Prep Difference?
« Reply #9 on: October 05, 2007, 07:05:23 AM »
Quote from: Ralph Brunt on October 05, 2007, 02:06:23 AM
skip the general rule is .001 for every inch of journal, i will talk to you more about this at the races.
fyi, mine is .003 mains and .0025 rods

Hey Ralph,  Don't be shy :)  share the wealth of information with all of us.  Greg
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~Greg
Forgive your enemies.  It messes up their heads.

just squirtin

  • Karma: +1/-0
Re: Engine Prep Difference?
« Reply #10 on: October 10, 2007, 02:47:07 PM »
parish automotive =sac town
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CHROMEY

  • Karma: +33/-0
Re: Engine Prep Difference?
« Reply #11 on: October 10, 2007, 03:45:01 PM »
Quote
Brad] 1:39 pm: i'd do it if i had a fuckin boat
[Brad] 1:40 pm: no time to work on it anymore
[bkplesh] 1:41 pm: take it to jim   
[cj410] 1:41 pm: why, so omar can pass brad too



LOLOLOLOLOLOLOLOLOLOLOLOLOLOL....THATS FUNNY SHIZZZ RIGHT THERE...and i dont even know jim !!
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  • Karma: +5/-0
Re: Engine Prep Difference?
« Reply #12 on: October 10, 2007, 10:33:02 PM »
If you have to tell the machineshop how to build it CORRECTLY, you are DOOMED!!!!   If they can't tell YOU how to do it, RUN!!!!   But then again, you may get lucky. You DO believe in luck dontcha? TIMINATOR
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