350 mag vs 350

[etkeeny]

Re: 350 mag vs 350

From the research that i've done looking for parts it seems that there was a split in the 1987 model year serial numbers 0B525982-0B773304 were all regular 350's with the older blocks and heads these numbers are specific to the 1987 model year, serial numbers 0A635178-0B525981 were Magnum 350's produced between 1986-1987 using the older block and heads and flat tappet camshafts, and serial numbers 0b525982-0F600999 produced from 1987-1995 use the newer style blocks and could have either the flat tappet or roller camshafts. So it sounds like you are correct, it was due to a production change during that year and not the magnum designation. Here are some great exploded parts views and part numbers if anyone is interested.
http://www.perfprotech.com/store/catalog/Mercruiser-Parts-Finder,3172.aspx

 

[JustJason]

Re: 350 mag vs 350

As Bondo and 180shabah have said...... there's not much of a difference between a 350 and a MAG. Different manifold and different stickers on the flame arrestor cover.

350 Magnum:
Steel pistons

I dunno what school your going to. And i dunno if the 87 in "twostroke87" is your birth year (putting you at 21ish). But you need to do some research on basic internal combustion engine theory. And if this is what your being taught you need to question it.... and this is why.
In any engine. You need to make your reciprocating mass as light as possible... period. The heavier the reciprocating mass in the LESS power an engine is going to make. Now why would any engine builder choose to use heavier parts in an engine they want to sell as a better or a "more power" engine?
2ndly... as shabah stated (closely but a bit incorrect) if you used steel pistons, you wouldn't trash the lower end, you'd trash the entire engine. The biggest consideration in building any engine, especially a hi reving engine, is the strength of the connecting rod. Connecting rods stretch... period.
If you use a light alloy for the pistion, there is less weight, and therefor less stress on the con rod. If you used a steel piston... there is more weight, therefor more stress on the con rod.
If you put steel pistons in an engine and reved it up, the con rods would stretch, and the piston would go smashing into the heads... and trash the engine.

Thats just a mechanical reason for not using steel pistons. The next biggest thing that comes to mind is heat. Steel absorbs heat slowly, retains heat well, and is slow to give up what heat it absorbs. Alloys do a much better job of quick heat transfer. You want a combustion chamber to run hot for power and efficency, but the heat needs to be managable, and limited to the combustion chamber only (which is everything from the top on the piston to the bottom of the valves) You need to be able to rapidly cool everything under the top of the piston. If you put steel pistions in boat engines every damm one would suffer from heat soak and every one out there would be deiseling and ingesting water.

Hope this helps.... and by all means question your intructors that are teaching you this junk.

 

[Cptkid570]

Re: 350 mag vs 350

Thank you for all of the answers everyone. I didn't mean to start such the debate, but it's been very educational for me..

Basically seems like there isn't much difference

 

[180shabah]

Re: 350 mag vs 350

...2ndly... as shabah stated (closely but a bit incorrect) if you used steel pistons, you wouldn't trash the lower end, you'd trash the entire engine. The biggest consideration in building any engine, especially a hi reving engine, is the strength of the connecting rod. Connecting rods stretch... period.
If you use a light alloy for the pistion, there is less weight, and therefor less stress on the con rod. If you used a steel piston... there is more weight, therefor more stress on the con rod.
If you put steel pistons in an engine and reved it up, the con rods would stretch, and the piston would go smashing into the heads... and trash the engine....

Just trying to keep it simple for him

 

[JustJason]

Re: 350 mag vs 350

KISS baby KISS!!!!!!! hehe

 

[mkast]

Re: 350 mag vs 350

I didn't mean to start such the debate

This wasn't a debate.
Someone stated some misinformation, then tried to justify the mistake by stating his questionable credentials.

 

[twostroke87]

Re: 350 mag vs 350

I really stopped reading once my age came into the story, which is truely really ignorant. I made a mistake yea, but as for stating questionable credentials? You have no idea who I am, where I've been, what I've done and what I am doing, so who are you to state my credentials. If you really want to get down to the nitty gritty, many of you "so called experts" repeatedly give out information that is outdated and incorrect. I don't bother trying to argue though because you are too stubborn to listen. Jesus you guys make mistakes when it comes down to simple winterization. I'm done with this. Forged alloy does have some steel in it, thats why its called alloy.

 

[JustJason]

Re: 350 mag vs 350

Forged alloy does have some steel in it, thats why its called alloy

Main Entry: 1al?loy
Pronunciation: \ˈa-ˌlȯi also ə-ˈlȯi\
Function: noun
Etymology: French aloi, from Old French alei, from aleir to combine, from Latin alligare to bind ? more at ally
Date: 1604
1: the degree of mixture with base metals : fineness
2: a substance composed of two or more metals or of a metal and a nonmetal intimately united usually by being fused together and dissolving in each other when molten ; also : the state of union of the components
3 a: an admixture that lessens value b: an impairing alien element
4: a compound, mixture, or union of different things <an ethnic alloy of many peoples>
5archaic : a metal mixed with a more valuable metal to give durability or some other desired quality

Has nothing to do with steel dude.

 

[Tail_Gunner]

Re: 350 mag vs 350

Boating has always been a rich mans hobby. Buying a new boat gets cheaper every year, but the maintenance, the repairs, and the overall cost of ownership of a boat has never gotten any cheaper.



Au contraire, mon Capit?n


That is if you can check your ego at the door of I-Boats the wealth of do it yourself info is overwhelming ive personally saved thousands and thousands by paying attention here........

 

[JustJason]

Re: 350 mag vs 350

I made that statement more in line with don't be sticker shocked when it comes to the price of a part or estimated hours in the price of a repair.

 

[Bondo]

Re: 350 mag vs 350

I really stopped reading once my age came into the story, which is truely really ignorant. I made a mistake yea, but as for stating questionable credentials? You have no idea who I am, where I've been, what I've done and what I am doing, so who are you to state my credentials.

Ayuh,.... You're Right,...

We have No Idea who you are, nor What you've done....
Other than stating Misinformation....
And,...
Nobody here stated Your credentials,... You did...
And it was Only You who tried to justify your statements with More misinformation....
That's what calls Your credentials into Question....

I don't doubt you have the credentials you state,....
But,...
Your Inexperince Does show....

If you really want to get down to the nitty gritty, many of you "so called experts" repeatedly give out information that is outdated and incorrect. I don't bother trying to argue though because you are too stubborn to listen. Jesus you guys make mistakes when it comes down to simple winterization.

Personally,... I consider it a Great Day, when I learn something I didn't know....
And,...
I'm always willing to Debate whether My ideas are worthy....
So,....
Bring it On.....
Tell me,... Exactly Where are We going Wrong with Our Winterizations,..??..??..??

Forged alloy does have some steel in it, thats why its called alloy.

And Lastly,....
Just when you start making alittle Sense,...
You say something like This....
This is Your Inexperince Showing.....
Aluminum Alloys, No Doubt, have many different minerals,+ metals mixed into it,...
But,...
None of it is Steel....

Stick around,....
There's No doubt in My mind,... Someday you're going to make a Great Tech,...
You might even be a pretty Good 1 now....
But,...
Sticking to your Guns, even when it's a Fact that you're Wrong,...
Isn't going to make you a Great Tech,... It'll just make you another Uninformed Wantabe....