220 5.7 volvo max rpm

atlmover · **Joined:** Mon Jun 09, 2014 10:02 pm **Posts:** 52

Anyone know the redline on an 06 220 with the Volvo 5.7? 280hp motor

meinmelb · **Posted:** Mon Sep 08, 2014 5:14 am

In the absence of any other replies I can suggest that as with many marine motors yours will probably have a WOT range of 4400-4800rpm. WOT is not a red line but a safe maximum operating rpm. My 4.3MPI has an electronic rev limiter at 5000rpm, and I suspect most other Volvo and Merc motors will be around there.

Humour me now with why you need to know the Redline? On boats this is really academic, as you should not run your motor at or near max rpm for extended periods.

deafwish · **Posted:** Mon Sep 08, 2014 5:49 am

meinmelb wrote:

Humour me now with why you need to know the Redline? On boats this is really academic, as you should not run your motor at or near max rpm for extended periods.

Pffft!

If you're engine is healthy, using quality lubricants and running a safe AFR, you'll be safe as houses.

meinmelb · **Posted:** Mon Sep 08, 2014 8:23 am

deafwish wrote:

Pffft!

If you're engine is healthy, using quality lubricants and running a safe AFR, you'll be safe as houses.

Ahem well actually..... As OP asked a "new boater" question I would give a conservative reply. These motors have a LOT of safety margin designed in so WOT of 4800rpm is as safe as you can get!

So as is the case of do as I say, don't do as I do..... I run a modified 19P high five prop that gets me to the rev limiter pretty quickly :roll:

, and I used to bounce of this often.... until I had it removed :twisted:

.... Current lube is acceptable, but changing to full synthetic before summer.

GottWhat · **Posted:** Mon Sep 08, 2014 11:31 am

Four Winns fast facts indicate the full throttle operating range to be 4600-5000 rpm for that engine.

Download the fast facts here: http://www.fourwinns.com/customer-service-catalogs.aspx

atlmover · **Joined:** Mon Jun 09, 2014 10:02 pm **Posts:** 52

Just took the boat out during the week and the water was like glass. Had it almost at WOT for a good while. It was around 4600 rpm . Speedometer was reading 51mph. Hard to resist.

Wrench · **Joined:** Thu Aug 21, 2014 8:20 pm **Posts:** 15

In a road vehicle, the redline is basically determined in a pushrod motor by the valvetrain. It can only run so fast before the opening ramp on the camshaft launches the valve such that the valve spring can't keep all the components in contact. The valve then isn't closed by the ramp on the cam, more or less it smashes into the valve seat by virtue of the spring tension. Things get ugly from there. Its easy to crank up the valve spring tension and raise the redline but there's also more contact pressure between the valve head and the seat which is directionally incorrect for long wear life, so you can see the conundrum. Generally lower spring pressure is better. But I recognize fun is fun, nothing like the mellow tones coming out of a marine exhaust!

The basic engine is easily good for 400 to 500 hours of "redline" WOT operation without damage or blowing up other than wear on the sliding and rolling components. Its a common manufacturer validation test of the structure of the engine and all the reciprocating and rotating assemblies.

I think Volvo Penta probably backed off from the higher vehicle redline into the 4000-5000 rpm range as their recommended "redline" just to give another factor of safety and longer engine life. I also don't think the near-zero-pressure lakewater cooling is quite as good as the 15psi pressurized radiator system in a vehicle and that may be another important reason that the heat transfer is just not as good and so some conservatism is necessary. Seems like I may have seen some pressurized coolant marine systems on the latest model EFI engines (??? from flipping thru manuals, not totally sure here) and if so they have higher outputs from the same displacement. I would think better cooling allows this.

www.iFourWinns.com

220 5.7 volvo max rpm

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