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Differance between "Regular" & "Marine cr
- Thread starter Root Pass
- Start date
goldhunter_2
Well-known member
Marine engines have heavy duty parts for example the oil pan weighs about 50 pounds but it is solid! the electric stuff like starter , alt have some different stuff to meet regulations to help prevent sparks etc etc etc if you have one set for a sealed fresh water system you need a different manifold to accept the tank and other stuff
A
Anonymous
Guest
I know the marine water pumps I have sold had a black powedercoated or epoxy finish and a bronze impeller.
The marine 350 I have had zero internal difference from any other 350 except that it only had 1.72" intake valves and probably a dinky camshaft, although I junked it without measuring anything. Everything else was the same, cast pistons, cast crank etc
The marine 350 I have had zero internal difference from any other 350 except that it only had 1.72" intake valves and probably a dinky camshaft, although I junked it without measuring anything. Everything else was the same, cast pistons, cast crank etc
goldhunter_2
Well-known member
I have two marine 350Q's and most everything in it is different , crank is heavier manifold, oil pan, pistons
are you buying a whole engine or do you need some parts :?:
are you buying a whole engine or do you need some parts :?:
A
Anonymous
Guest
One thing I forgot is some marine engines run backwards. The only difference there is the cam though
And just to clarify, for the 350 alone, GM probably made about 20 different pistons, so there are HD pistons that may be used in some marine engines. But just because it is a marine engine does not mean that it has forged crank or pistons or any other internal differences, so, caveat emptor, buyer beware
And just to clarify, for the 350 alone, GM probably made about 20 different pistons, so there are HD pistons that may be used in some marine engines. But just because it is a marine engine does not mean that it has forged crank or pistons or any other internal differences, so, caveat emptor, buyer beware
Root Pass
Well-known member
Goldhunter, I haven't see any Marine crate engines for sale in Jeggs or Scoggins
Dickey etc. and I was just wondering what if any were the big differences.My Cadillac
is not a "marine" engine but Lord knows plenty have been put on airboats same with
the 455 or aircraft engines for that matte.I'm trying to get a little more education
that anything else!! Although I do like to day dream as accurately as possiable :lol:
Dickey etc. and I was just wondering what if any were the big differences.My Cadillac
is not a "marine" engine but Lord knows plenty have been put on airboats same with
the 455 or aircraft engines for that matte.I'm trying to get a little more education
that anything else!! Although I do like to day dream as accurately as possiable :lol:
SwampMatt
Well-known member
My neighbor is looking for someone to help him rebuild his big block ford motor for his jet boat.
I asked him this same question.
He said the water flow was reversed thru the motor on marine engines???? or something like that?
I always heard different carb and spark-proof alternator was what made marine.
Thanks for asking the question Boblee.
Is anyone out there in the Orlando area willing to hook up with my neighbor about his jet boat? He says he has $6000 or so for the rebuild. If he had a few more $$ I was gonna try to talk him into a Waterthunder motor - I started to, but he needs to keep it ford for some reason.
matt.
I asked him this same question.
He said the water flow was reversed thru the motor on marine engines???? or something like that?
I always heard different carb and spark-proof alternator was what made marine.
Thanks for asking the question Boblee.
Is anyone out there in the Orlando area willing to hook up with my neighbor about his jet boat? He says he has $6000 or so for the rebuild. If he had a few more $$ I was gonna try to talk him into a Waterthunder motor - I started to, but he needs to keep it ford for some reason.
matt.
goldhunter_2
Well-known member
moodfood,.
he could probably go with a new bell house or adapter plate and run any type of engine but that would be a extra part he would have to buy
boblee74,
Mine aren't crate engines though I am sure someone sells them mine came form a shop in Tampa some time back. don't misunderstand my earlier post you can replace true marine engine parts with stock stuff and it will work. I like the Ac engine idea for airboats but if I was going car motor I would not use a marine engine due to weight yo can change the starter, alt and air filter to marine and meet USCG regulations
he could probably go with a new bell house or adapter plate and run any type of engine but that would be a extra part he would have to buy
boblee74,
Mine aren't crate engines though I am sure someone sells them mine came form a shop in Tampa some time back. don't misunderstand my earlier post you can replace true marine engine parts with stock stuff and it will work. I like the Ac engine idea for airboats but if I was going car motor I would not use a marine engine due to weight yo can change the starter, alt and air filter to marine and meet USCG regulations
A
Anonymous
Guest
moodfood":12qm0lop said:
Well, yeah that too, and a flame arrestor, and flame resistant hose, and a fuel pump that won't leak out fuel if the diapragm ruptures.
Lot of marine motors are EFI now, but I'm not sure what might be different with the EFI systems from auto....
Root Pass
Well-known member
Well I just didn't know if there was a major difference as it applies to us airboaters. I
see some manufactures advertising "marine crate motor" and just didn't know what
the deal is.I thought it might have something to do with corrosion like stainless steal
was used in certain places etc. But I guess with the humidity in Florida I might need
a marine engine in my Dodge! :lol:
see some manufactures advertising "marine crate motor" and just didn't know what
the deal is.I thought it might have something to do with corrosion like stainless steal
was used in certain places etc. But I guess with the humidity in Florida I might need
a marine engine in my Dodge! :lol:
A
Anonymous
Guest
Well, I guess you could get a CCW rotation marine engine and a gear box, and run a left handed prop 
The standard marine engine differences.
1: carb that the overflows run back into the carb so if the needle valves stick it floods the engine and not runs gas all over the engine.
2: fuel pump has a line that runs to the carb again to flood into the engine if the diafram ruptures.
3: spark arester
4: the old engines with points have a sealed distributer.
5: alternators have spark arrestors on them
The main thing with marine engines are not having anything with sparks or fuel vapors in the bilge. Airboats dont have a problem with that because the engines are out in the open and dont have to worry about fumes in the bilge.
Water flow is the same as other engines. The water pumps are normally with stainless impellers and back plates. If the engines are fresh water cooled ( with heat exchangers) they will have a raw water pump.
Some of the internals will be different, cam and compression ratio, but in general they use standard parts.
Tim
1: carb that the overflows run back into the carb so if the needle valves stick it floods the engine and not runs gas all over the engine.
2: fuel pump has a line that runs to the carb again to flood into the engine if the diafram ruptures.
3: spark arester
4: the old engines with points have a sealed distributer.
5: alternators have spark arrestors on them
The main thing with marine engines are not having anything with sparks or fuel vapors in the bilge. Airboats dont have a problem with that because the engines are out in the open and dont have to worry about fumes in the bilge.
Water flow is the same as other engines. The water pumps are normally with stainless impellers and back plates. If the engines are fresh water cooled ( with heat exchangers) they will have a raw water pump.
Some of the internals will be different, cam and compression ratio, but in general they use standard parts.
Tim
The standard marine engine differences.
1: carb that the overflows run back into the carb so if the needle valves stick it floods the engine and not runs gas all over the engine.
2: fuel pump has a line that runs to the carb again to flood into the engine if the diafram ruptures.
3: spark arester
4: the old engines with points have a sealed distributer.
5: alternators have spark arrestors on them
The main thing with marine engines are not having anything with sparks or fuel vapors in the bilge. Airboats dont have a problem with that because the engines are out in the open and dont have to worry about fumes in the bilge.
Water flow is the same as other engines. The water pumps are normally with stainless impellers and back plates. If the engines are fresh water cooled ( with heat exchangers) they will have a raw water pump.
Some of the internals will be different, cam and compression ratio, but in general they use standard parts.
Tim
1: carb that the overflows run back into the carb so if the needle valves stick it floods the engine and not runs gas all over the engine.
2: fuel pump has a line that runs to the carb again to flood into the engine if the diafram ruptures.
3: spark arester
4: the old engines with points have a sealed distributer.
5: alternators have spark arrestors on them
The main thing with marine engines are not having anything with sparks or fuel vapors in the bilge. Airboats dont have a problem with that because the engines are out in the open and dont have to worry about fumes in the bilge.
Water flow is the same as other engines. The water pumps are normally with stainless impellers and back plates. If the engines are fresh water cooled ( with heat exchangers) they will have a raw water pump.
Some of the internals will be different, cam and compression ratio, but in general they use standard parts.
Tim
I think the biggest issue apart from coast guard issues is piston to wall clearance depending if it has a closed cooling system or if it uses lake water. I don't know what the marine engine manufacturer's do but Keith Black recommends around .005" clearance for open cooling systems with their hyperutectics because incoming water could be just above freezing, (hence water jacket exhaust manifolds to preheat coolant). Same reason for the brass impeller etc. Brackish or salt water would reduce that punched tin impeller to nothing pretty quick, but a water pump doesn't make a marine engine. I would hope they have one piece valves, depending on application stelite exhaust seats, inconel coated exhaust valves, and a little better hardware all around. :roll:
You buy a crate engine or long block and it usually doesn't come with all that bolt on stuff anyways, marine fuel pump, alternator, carb usually has different fuel bowl vent tubes, etc.
The left hand prop with backwards engine crossed my mind but I bet a backwards starter costs a bit more the the millions or normal starters out there! :lol:
You buy a crate engine or long block and it usually doesn't come with all that bolt on stuff anyways, marine fuel pump, alternator, carb usually has different fuel bowl vent tubes, etc.
The left hand prop with backwards engine crossed my mind but I bet a backwards starter costs a bit more the the millions or normal starters out there! :lol:
Hey moodfood as a youngin i grew up on the lake of the ozarks in south central missouri and have owned 7 different jet boats (thought they were the best till i found airboats) tell youre neighbor to stick with that 460 but throw the heads away ford only made a few good 385 heads and those were all on 429's and the likelyhood of finding them are slim and none he should get a set of ford racing cobra jet heads and a good intake with the right parts they make over 500 hp. and tons of torque
SwampMatt
Well-known member
Thanks for the tip scooter. I'll pass it along. Thanks to the nazi-like tactics of the Orlando code enforcement office (and thanks to some complaining neighbors), he's not allowed to keep his boat parked in his driveway anymore - and has been storing it at a relative's house in St. Cloud. It's a small world