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Old 12-08-2006, 10:58 PM   #1
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Boat name: Miss-T
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Merc XR2 Specs

During one of my previous threads regarding props for my Black Max XR2, Matt mentioned that he thought the RPM for this engine should be 6000 not 5500 as I had been lead to believe.

Had a look around the web but cant find any useful info to back this up.

Does anyone out there have a copy of the specs for these engines or at least let me know where to start looking? I believe these were around in the mid to late 80's.

Dont really want to start over rev'ing the engine unnecessarily!!

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Old 12-08-2006, 11:17 PM   #2
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I think I mentioned when you posted before I had an early one it reved happily over 6k it never blew up, after some 3yrs I had it checked over and new rings fitted, and ran it for a further 3yrs no problem, as a mate who used to build them used to say the more you rev it and hold it there the quicker it comes to me, for a pleasure boat if you want it to last prop it for 5800 2up 5500 4/5 up it might last longer that way

i can na give her any more captain
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Old 12-08-2006, 11:36 PM   #3
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I'm not sure whethere this is a help or not, it is taken from the works Merc manual. However, there is no mention of the XR2 just the XR4. There is also a page specifically given over to the XR4 and a graph of the hp against revs. It says that the engine must be proped at or just below the max rpm, which is 5500, and there is a rapid loss of power as revs increase past that maximum.
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Old 13-08-2006, 12:51 AM   #4
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most V6 merc's should be fine to rev to 6500 as long as you premix
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