Slant on Craigslist, Marine engine. Not mine

Discussion in 'Slant 6 Engines' started by CichliDart, Nov 14, 2017.

  1. CichliDart

    CichliDart Well, where is it now?

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  2. Scampin around

    Scampin around Well-Known Member

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    What's different about marine engines?
     
  3. Charrlie_S

    Charrlie_S Well-Known Member

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    As far as I know, internally, none. There are some differences in the cooling system (water pump system) intake/carb, exhaust manifold, distributor.
     
  4. 64DartGTinAZ

    64DartGTinAZ FABO Gold Member FABO Gold Member

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    Not sure how accurate this is, but: Hidden Treasures: Mopar Marine Engine - Deep Six - Mopar Muscle Magazine

    "Because Chrysler marine engines were specially assembled with the best parts and techniques, this is a great find for someone who needs a Slant Six. There are differences, however, between marine and automotive engines, as these engines typically had looser piston-to-cylinder clearance than their automotive counterparts, being cooled with a constant supply of fresh (or salt) water. Additionally, the exhaust and often intake manifold of a marine engine are completely different, with water being routed through the exhaust."

    Here's something from .org (see second post by SlantSixDan): Slant Six Forum, :: View topic - Slant Marine Rebuild
     
  5. slantsixdan

    slantsixdan =..=

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    BS, BS, BS. They were assembled with as much (and as little) care as the passenger car engines. They did not receive special, loving attention from handpicked engineers and assemblers using extra-special parts and tools, etc. That is a fairytale somebody at Mopar Muscle pulled out of his aѕѕ.

    Parts differed from the car/truck engines to the degree necessary for marine service. That means an open cooling system using an external water pump with noncorroding (bronze) metal parts and a marine-type exhaust manifold to discharge the exhaust together with the water; different oil pan, different crankcase ventilation, nonsparking distributor (without vacuum advance), nonsparking alternator, and nonsparking starter because a spark in the enclosed engine space of an inboard boat motor installation could easily mean an explosion, and other adaptations. Fun stuff to learn about in terms of what's different, but no, there generally aren't extra-special goodies to be gleaned from a marine motor. The blocks aren't extra-good, the heads aren't extra-tough, the cranks don't have a clearer "Dinnnnng!" when you whack 'em with a hammer, nothing. Stellite-faced exhaust valves and positive exhaust valve rotators were available for severe-duty service…same parts available in the heavy-duty Dodge truck/van/bus engine configurations.

    If you start with a marine engine, you have to undo most of the marine mods to make it work in a car. The marine 2bbl intake is a nice piece, and it was used in Marine service with a bolt-on waterbox to provide intake heat—that can be used as a street piece or removed and the regular exhaust-based heat setup can be used.

    Nope, the specs are identical. More made-up bulk wrap by Mopar Muscle.

    Back to reality: the really interesting thing was when Chrysler laid the Slant-6 the rest of the way over (cylinders horizontal) to create the "Space Saver" marine inboard engine.