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-   -   Outboards vs I/O (https://www.offshoreonly.com/forums/general-boating-discussion/386020-outboards-vs-i-o.html)

Rocco 07-25-2025 12:56 PM

https://cimg7.ibsrv.net/gimg/www.off...fd0fb357de.jpg

dirtlawyer 07-25-2025 02:28 PM

As a long time former I/O guy, I get the desirability of a big block sound, but for me and being that we do all of our boating in saltwater, the reliability of outboards wins over the sound.

hogie roll 07-25-2025 02:29 PM


Originally Posted by vdrsnk04 (Post 4931320)
I haven’t been able to hear it or see it run in person. But with the mods he has done and it being on a Performance 360. I bet it runs and accelerates hard. I would guess over 140 on top end.

Haven’t seen an OB cat do 140 yet, lots are close though. Probably out there already.

hogie roll 07-25-2025 02:30 PM


Originally Posted by BajaFresh (Post 4931262)
I've never owned an outboard before but they are the latest trend now. They seem to be pretty efficient but I will always love the sound of a roaring V8 I/O.

Why are outboard so quiet and do they make a switchable exhaust like a Captain's Call? Would a V8 outboard sound like an I/O? Does Merc design the blocks?

The 64 degree bank angle means they don’t exactly have the classic sound.

BajaFresh 07-25-2025 06:27 PM

Interesting info from everyone. Thanks.

I wonder if Merc would ever use the outboard blocks to build I/O motors.

powerboatr 07-25-2025 06:33 PM

i just watched a video from a captain coach or coach captain on a run he did to move a 40 plus foot valhalla from irc Miami to marco island
it had four mercs on the back and at 47 to 50 it was burning on the range of 61 gallons per hour
it was something
https://youtube.com/shorts/hLRTritv6-I?feature=sharedhttps://youtube.com/shorts/hLRTritv6-I?feature=shared

Markus 07-26-2025 01:08 AM


Originally Posted by BajaFresh (Post 4931353)
Interesting info from everyone. Thanks.

I wonder if Merc would ever use the outboard blocks to build I/O motors.

It would be too expensive. The benefit of I/Os is that you can use ancient, simple, GM automotive engines built at high volumes and low cost, paired to a drive.

Back in the days when Volvo still had a car division, they used GM engines instead of their modern in-house 4 valve engines for I/Os.

JaayTeee 07-26-2025 01:13 PM


Originally Posted by Markus (Post 4931357)

Back in the days when Volvo still had a car division, they used GM engines instead of their modern in-house 4 valve engines for I/Os.

False,
Before the OMC merger/ acquisition, there were thousands and thousands of Bayliner Capri’s just to name a few, that were equipped with 4 cylinder cylinder Volvo engines.

Markus 07-26-2025 02:17 PM


Originally Posted by JaayTeee (Post 4931379)
False,
Before the OMC merger/ acquisition, there were thousands and thousands of Bayliner Capri’s just to name a few, that were equipped with 4 cylinder cylinder Volvo engines.

But weren’t those the seventies B20/B21/B23 4 cylinder designs?

Brunswick, not OMC, acquired Bayliner in 1986. Volvo’s 4/5/6 cylinder 4-valve engine platform was launched in the early nineties. As far as I remember, those engines were not marinized. Volvo Penta used GM V6 engines instead.

F-2 Speedy 07-26-2025 02:54 PM

Funny what threads bring the lurking OG's out to post, good to see you're still around.......:ernaehrung004:............I say long live the IO's


https://cimg2.ibsrv.net/gimg/www.off...723e4d6ef4.jpg


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