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General Site Info => General Discussion => Topic started by: Irish_Alley on March 22, 2015, 05:33:04 pm

Title: marine engine
Post by: Irish_Alley on March 22, 2015, 05:33:04 pm

my uncle is looking for a 305 for his boat. whats the difference in a marine and regular engine

Title: Re: marine engine
Post by: LTZ C20 on March 22, 2015, 06:47:45 pm

Not sure exactly, I saw an GM LS marine engine one time that had the oil filter at the front of the oil pan. I've also hard that there are marine spark plugs and wires?? Possible different kind of flex plate for attaching to outboard assembly??

A friend at work said that as a kid his Family had a wooden Chris Craft that had a high output 327 straight out of a corvette.

So I have no idea lol.

Title: Re: marine engine
Post by: enaberif on March 22, 2015, 06:57:34 pm

Marine 350s usually spin counterclockwise vs clockwise with non marine.

Title: Re: marine engine
Post by: LTZ C20 on March 22, 2015, 10:38:54 pm

How the heck does that work?

Title: Re: marine engine
Post by: enaberif on March 22, 2015, 11:10:14 pm

Quote from: LTZ C20 on March 22, 2015, 10:38:54 pm

How the heck does that work?

Beats me.. lol. I just read about it a few times.

Title: Re: marine engine
Post by: LTZ C20 on March 22, 2015, 11:40:44 pm

That makes my brain hurt.

Title: Re: marine engine
Post by: roundhouse on March 23, 2015, 07:40:58 am

Only one of the engines in a twin engine boat spins backwards


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Title: Re: marine engine
Post by: LTZ C20 on March 23, 2015, 09:32:59 am

Ok stop your giving me a headache lol

Title: Re: marine engine
Post by: Stewart G Griffin on March 23, 2015, 06:24:13 pm

1) he can have my 305 if he's willing to rebuild it.

2) Not sure what the diff is between a marine and regular engine, but think about this;  A marine engine is working like a car engine driving uphill---ALL THE TIME.   So they may be tougher?

Title: Re: marine engine
Post by: Engineer on March 23, 2015, 08:22:57 pm

Quote from: Stewart G Griffin on March 23, 2015, 06:24:13 pm

1) he can have my 305 if he's willing to rebuild it.

2) Not sure what the diff is between a marine and regular engine, but think about this;  A marine engine is working like a car engine driving uphill---ALL THE TIME.  So they may be tougher?

That is why you see many more Chevrolets dominating inboard marine applications and no Furds or Dogdes.

Title: Re: marine engine
Post by: fitz on March 24, 2015, 05:04:46 am

  If its raw water cooled (engine is cooled from the water that the boat is being used in) the freeze plugs will be stainless steel (I think, maybe brass?). That way they won't rust out if used in salt water.
  The cam should be designed to make power when the boat is at its cruising RPM.

Title: Re: marine engine
Post by: fitz on March 24, 2015, 07:22:35 am

  Keep in mind the accessories like the starter, alt, and fuel pump are different also.
  The marine starter and alternator are designed not to produce a spark that could cause an explosion in the bilge.  The fuel pump does not have the weep hole in the bottom that could leak gas into the bilge.
  If its a fresh water only boat or has a heat exchanger (kinda like a radiator for a boat) I would just change the accessories and run it like it is.
  If the boat will be used in salt water I would change the freeze plugs.
  Boating season is just around the corner.
 
 

Title: Re: marine engine
Post by: roundhouse on March 24, 2015, 07:36:12 am

Your uncle should get a 350 instead
And have alot more power
Very little difference in fuel consumption


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Title: Re: marine engine
Post by: Irish_Alley on March 24, 2015, 02:34:38 pm

yeah i was thinking a 350 would be good. but wasnt sure where the difference starts in the marine engines. i think we should be able to take a short block and swap all the parts on the 205 to it. maybe get a new cam and lifters and it should be good

Title: Re: marine engine
Post by: roundhouse on March 24, 2015, 04:33:04 pm

Id just get a new crate engine with heads

I think the starter on a 305 has a different bolt holes than a 350

Or a good used one from a wrecked car if you can hear it run before you buy it
A used one is less than $500 where I live


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Title: Re: marine engine
Post by: Captkaos on March 24, 2015, 07:56:37 pm

When it comes to GM marine power, the engine itself is the same.  I would run Brass freeze plugs, but...
Camming for a boat is different than a car...