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Unread 08-14-2006, 01:44 PM
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Default I/O RPM'S
HEY I/O GUYS, I HAVE A 84 MERCRUISER 470, AND SHE IS OLD AND HAS HER PROBLEMS. I USUALLY RUN HER AROUND 3500 RPM AT CRUISING SPEED. MAINLY BECAUSE I AM AFRAID TO RUN HER ANY FASTER AND BLOW HER TOP :-/ IF ANYONE ON THE BOARD HAS THIS MOTOR, WHAT SPEED (RPMS) DO YOU CRUISE AT? I WOULD LIKE TO GET HER RUNNING FASTER, I AM JUST AFRAID I AM GOING TO RUIN HER. :'(
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C:\Documents and Settings\cyensen.VISTADESIGN\My Documents\My Pictures\boat\DSC00750-a.jpg CY 1984 V20 STEP LIFT I/O 470 MERCRUISER Wheeling, WV
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Unread 08-14-2006, 01:46 PM
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Default Re: I/O RPM'S
I HAVE HAD HER RUNNING AT 3900 BUT SHE SOUNDS "BEST" AT 3500. ANYMORE THAN 3700 AND SHE SOUNDS LIKE SHE IS GOING TO COME APART.
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C:\Documents and Settings\cyensen.VISTADESIGN\My Documents\My Pictures\boat\DSC00750-a.jpg CY 1984 V20 STEP LIFT I/O 470 MERCRUISER Wheeling, WV
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Unread 08-14-2006, 02:44 PM
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Default Re: I/O RPM'S
CY, I don' t know the specs on that motor but I recall it being fairly large bore, so it's not gonna like high RPM's. Probably best cruise around 3200-3500.

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Unread 08-14-2006, 03:17 PM
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Default Re: I/O RPM'S
Mines an '89 165 4 cyl which if I'm not mistaken is a later version on the same engine. Clymer manual lists full throttle as 4200 - 4600 rpm, but I agree with Airslot, engine seems "happiest" at 3200 - 3500 rpm
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Unread 08-14-2006, 03:58 PM
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Default Re: I/O RPM'S
ANY GUESS ON HOW MANY MPH THAT IS, I DON'T HAVE A SPEEDOMETER. ???

GUESS I AM JUST CURIOUS ::)
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C:\Documents and Settings\cyensen.VISTADESIGN\My Documents\My Pictures\boat\DSC00750-a.jpg CY 1984 V20 STEP LIFT I/O 470 MERCRUISER Wheeling, WV
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Unread 08-14-2006, 04:06 PM
bigshrimpin bigshrimpin is offline
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Default Re: I/O RPM'S
The 4 cly Volvo AQ130C has a max RPM of 5100 or 5500 depending on which model.
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Unread 08-14-2006, 04:17 PM
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Default Re: I/O RPM'S
I AM A MERCRUISER 470 MAN, DOESN'T CAPT BENT HAVE A 470? WHERE IS HE TODAY?
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C:\Documents and Settings\cyensen.VISTADESIGN\My Documents\My Pictures\boat\DSC00750-a.jpg CY 1984 V20 STEP LIFT I/O 470 MERCRUISER Wheeling, WV
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Unread 08-14-2006, 04:48 PM
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Default Re: I/O RPM'S
max rpm's on my v/6 4.3l is 4400-4800 if that's any help.
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Unread 08-14-2006, 10:19 PM
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Default Re: I/O RPM'S
3200-3500 rpm and a 21 pitch prop gives me about 25mph
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Unread 08-15-2006, 04:40 PM
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Default Re: I/O RPM'S
Quote:
Originally Posted by rick
3200-3500 rpm and a 21 pitch prop gives me about 25mph
Ditto to that. ICW speed limit is 25 here'bouts anyway.
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