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Outboards vs I/O

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Old 07-26-2025 | 05:06 PM
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Originally Posted by F-2 Speedy


My 525s need some of those accessories you got there.
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Old 07-26-2025 | 09:58 PM
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Originally Posted by Markus
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.
Volvo 4 cylinders were standard issue in the 17 & 19 footers til 85 when they
signed a 5 year contract with OMC with the newly introduced cobra,Brunswick still had to honor that til 90

Volvo produced 4 cylinder engines were use to til the early 90’s when they came up with the SX drive, then they went to the GM 3.0 that OMC was using at the time.

Last edited by JaayTeee; 07-26-2025 at 10:22 PM.
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Old 07-27-2025 | 02:57 AM
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You misread 4-valve and 4-cylinder.

We are saying the same thing: Volvo only marinized its simple, cheap, car engine designs. When the car engines became too sophisticated and expensive, Volvo switched to GM engines.
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Old 07-27-2025 | 08:34 AM
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Why does the I/O have to be cheap inexpensive?

I think the bigger reason mercury doesn’t do it is the OB gives more room in the boat.

What I don’t understand is the “I boat in salt water so the OB is better”, I hear this all the time.

I own both a OB boat and a open cooled I/O, still have to flush both. I have freinds with closed cooled I/O’s those are a breeze. I hope people are flushing the salt water used Outboard.
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Old 07-27-2025 | 08:51 AM
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Originally Posted by Wildman_grafix
Why does the I/O have to be cheap inexpensive?

I think the bigger reason mercury doesn’t do it is the OB gives more room in the boat.

What I don’t understand is the “I boat in salt water so the OB is better”, I hear this all the time.

I own both a OB boat and a open cooled I/O, still have to flush both. I have freinds with closed cooled I/O’s those are a breeze. I hope people are flushing the salt water used Outboard.
I’m with you. I guess if you don’t flush your motors the OB’s would probably prove to rot less, but I have closed cooled blocks and my IO’s are super easy to flush - 5 minutes on each motor, kayak under the lift and remove the plug, I have valves on my headers so I drain the headers into the bilge and out the drain plug, Drop the hatch and spray off the drives, steering, platform, tabs, etc……. It’s a courtesy I extend to my neighborhood allowing them to get these 10 extra minutes of engine noise.
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Old 07-27-2025 | 10:23 AM
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Originally Posted by Rocco
At some point 5 outboards are obnoxious and has to have an effect on CG. The turbo whine is pretty awesome! This 41 Cigarette Nighthawk is Bad Ass and very balanced.
Out of curiosity, how fast is that 41 Cigarette Nighthawk? I have an idea, but what is the real world top speed?

ChatGPT’s answer to that question was:

”41’ Cigarette Nighthawk equipped with twin 1100 hp Mercury Racing engines and #6 drives is an extremely high-performance offshore powerboat. Here’s what you can expect:

Estimated Top Speed: 120 to 135+ mph (193 to 217+ km/h) under optimal conditions.”


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Old 07-27-2025 | 10:41 AM
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Originally Posted by Smarty
Out of curiosity, how fast is that 41 Cigarette Nighthawk? I have an idea, but what is the real world top speed?

ChatGPT’s answer to that question was:

”41’ Cigarette Nighthawk equipped with twin 1100 hp Mercury Racing engines and #6 drives is an extremely high-performance offshore powerboat. Here’s what you can expect:

Estimated Top Speed: 120 to 135+ mph (193 to 217+ km/h) under optimal conditions.”
A 42X with 1100’s won’t do that, no way something wider, heavier and with a roof on it is

Myrick ran something similar in the shootout a few years ago and it ran just over 100
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Old 07-27-2025 | 11:28 AM
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Originally Posted by Smarty
Out of curiosity, how fast is that 41 Cigarette Nighthawk? I have an idea, but what is the real world top speed?

ChatGPT’s answer to that question was:

”41’ Cigarette Nighthawk equipped with twin 1100 hp Mercury Racing engines and #6 drives is an extremely high-performance offshore powerboat. Here’s what you can expect:

Estimated Top Speed: 120 to 135+ mph (193 to 217+ km/h) under optimal conditions.”
Like 106-110 iirc. It’s pretty fast hull. Runs good even with the 565s
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Old 07-27-2025 | 12:37 PM
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Originally Posted by Wildman_grafix
Why does the I/O have to be cheap inexpensive?

I think the bigger reason mercury doesn’t do it is the OB gives more room in the boat.
Inboards have always competed with outboards on price and looks.
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Old 07-28-2025 | 08:07 AM
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Originally Posted by hogie roll
Like 106-110 iirc. It’s pretty fast hull. Runs good even with the 565s
I have seen over 100 mph. It has M8s on it. Its just a very nice package and very stable. The gentlemen that owns it also has a 41 Apache. SC Red Hot V-88.
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