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Outboard weight diiference- AL vs Cast Iron?

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Outboard weight diiference- AL vs Cast Iron?

Old 09-28-2019, 07:35 AM
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Default Outboard weight diiference- AL vs Cast Iron?

The newly designed Mercury, Yamaha and Etec engines are a lot lighter than older generation Suzuki, Honda and Tohatso in their V6 series.And of course the heavy engines are cheaper to buy and easier to get.

Does anyone know if the lighter stuff has cast aluminum and if the older stuff still uses Cast Iron for blocks, heads and lower housings?

The older cast iron stuff has proven it will last in the 5000 hr range. Do you think the Aluminum blocks and heads will be more disposable?

Old 09-28-2019, 07:38 AM
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Originally Posted by Bullshipper View Post
The newly designed Mercury, Yamaha and Etec engines are a lot lighter than older generation Suzuki, Honda and Tohatso in their V6 series.And of course the heavy engines are cheaper to buy and easier to get.

Does anyone know if the lighter stuff has cast aluminum and if the older stuff still uses Cast Iron for blocks, heads and lower housings?

The older cast iron stuff has proven it will last in the 5000 hr range. Do you think the Aluminum blocks and heads will be more disposable?
Who made a cast iron outboard block?
The weight savings has been in the cowlings, bellypans, skirts, brackets, cylinder liners (or not).
Old 09-28-2019, 08:01 AM
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Originally Posted by Parker Yacht View Post
Who made a cast iron outboard block?
The weight savings has been in the cowlings, bellypans, skirts, brackets, cylinder liners (or not).

Thanks for correcting me Ole. I see that suzuki blocks are aluminum too. My Bad.

https://www.sportfishingmag.com/how-...s-its-engines/
Old 09-28-2019, 10:50 AM
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As far as I know all outboards were always at least in the last 50+ years alu for blocks, heads and lower units....the only cast iron blocks and heads were on inboards.
Old 09-28-2019, 10:58 AM
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The Fagoel / Homelite / Bearcat 55 was the only outboard motor I can think of with a cast iron block. It was based on the Crosley automotive engine.
Old 09-28-2019, 11:42 AM
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Only a few iron/steel parts on any modern outboard. Things like cranks, rods, cams, gears, sprockets. All blocks and heads are Al. Some blocks have cast in steel/iron cylinder sleeves (most really) but some the cylinders are coated aluminum.

The old four strokes were a good bit heavier as some were adapted car engines and there was metal in places it was not really needed. As the 4s outboards have evolved, they have gotten a little more refined and got rid of metal that was not really needed.
Old 09-28-2019, 11:50 AM
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Originally Posted by Corndog38 View Post
Only a few iron/steel parts on any modern outboard. Things like cranks, rods, cams, gears, sprockets. All blocks and heads are Al. Some blocks have cast in steel/iron cylinder sleeves (most really) but some the cylinders are coated aluminum.

The old four strokes were a good bit heavier as some were adapted car engines and there was metal in places it was not really needed. As the 4s outboards have evolved, they have gotten a little more refined and got rid of metal that was not really needed.
Who had adapted car engines?

Old 09-28-2019, 12:07 PM
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I think some Hondas are adapted car engines.
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Old 09-28-2019, 12:23 PM
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Originally Posted by Parker Yacht View Post
Who made a cast iron outboard block?
The weight savings has been in the cowlings, bellypans, skirts, brackets, cylinder liners (or not).
After I repowered from 3.3 F250's to 4.2 F250's the first thing I noticed was the difference in the cowlings and the mechanism that locks the cowlings in place. I'm not saying the new cowlings and locking mechanism are inadequate, but I am saying IMO the cowlings and locking mechanism on my old motors was superior to the new motors.
BUT, I will also add that changing oil filters on the new motors is FAR easier than on the old motors.
Old 09-28-2019, 12:32 PM
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Originally Posted by tarpononecharter View Post
After I repowered from 3.3 F250's to 4.2 F250's the first thing I noticed was the difference in the cowlings and the mechanism that locks the cowlings in place. I'm not saying the new cowlings and locking mechanism are inadequate, but I am saying IMO the cowlings and locking mechanism on my old motors was superior to the new motors.
BUT, I will also add that changing oil filters on the new motors is FAR easier than on the old motors.
There are MANY things on new outboards not as robust as their predecessors.
All in the name of saving weight. You know, make it lighter, oh yeah, but I want it to run for 50,000 hrs also.
Old 09-28-2019, 12:34 PM
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A lot of the weight reduction comes from getting rid of the steel cylinder sleeves. Not sure what else they do to cut weight.

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