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Author Topic:   Max RPM

66Sakonnet posted 06-25-2001 10:22 AM ET (US)
I've seen in some other posts that the max RPM should be about 5200, would this be correct for an older engine, like a 71 Merc? My Sakonnet has a 115 Merc, and I noticed yesterday that at the end of the throttle we are only doing about 4200 RPM.. can I just adjust the cable and safely get some more speed out of her?
thanks
Bigshot posted 06-25-2001 11:22 AM ET (US)
115 should be 52-5500rpm. What prop are you running? If linkage is going to full( on negine) that is is. You might want to do a compression tet, etc. She is 30 years old.
Steve Leone posted 06-26-2001 08:01 PM ET (US)
CAREFUL!!! What year is this Merc? If it is an inline 6 cylinder you better contact me. Steve.
Bigshot posted 06-27-2001 10:54 AM ET (US)
71 is a inline 6. 100's were 5300, 115 was 5500, and 150 were 5700 I believe, why contact you?
66Sakonnet posted 06-28-2001 09:42 AM ET (US)
I'm going to check on the prop this weekend or next week. Throttle cable (original merc chrome unit) tops out, haven't checked the cable at the engine, but at full throttle the engine is only doing 4200 or so..., I thought that adjusting the cable to where I get 5000 or so a full throttle might help pulling up skiers etc.. also going to cut back to two batteries, thanks for the responses, I'll get back to you next week...
Bigshot posted 06-28-2001 11:18 AM ET (US)
If you can adjust it to get more than do so. It is easier to look at the side of the engine while throttle is at full and see if you are maxed out, if so you can't adjust doodoo. If your hull has water in it, that might be all she wrote.
66Sakonnet posted 06-28-2001 02:49 PM ET (US)
Bigshot, hull DEFINATELY has water in it! I had to repair the rear seat that covers the hyd unit for the trim/tilt... when I bored the holes to put epoxy and dowels in there a wet brownish bit of wood came up.. that leads to a question... how much water can the hull/foam absorb before it sinks?
Bigshot posted 06-29-2001 10:35 AM ET (US)
LOL! It won't sink! Just get slow as hell and start handling bad or even dangerously, something will eventually crack or break but it will still float. Might weigh so much it breaks your trailer. My 13 blew a hole in the hull about 1'x2' from the water(might have been a patch that blew off) and then a big crack where the gas tank goes where the foam collapsed and then galss cracked. then the wood got so bad the transom cracked in the corner from the top down about 6 inches in 1 day. That is when I got rid of it. Hind sight being 20/20, sell it now while it is still worth something.

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Author	Topic: Max RPM
66Sakonnet	posted 06-25-2001 10:22 AM ET (US) I've seen in some other posts that the max RPM should be about 5200, would this be correct for an older engine, like a 71 Merc? My Sakonnet has a 115 Merc, and I noticed yesterday that at the end of the throttle we are only doing about 4200 RPM.. can I just adjust the cable and safely get some more speed out of her? thanks
Bigshot	posted 06-25-2001 11:22 AM ET (US) 115 should be 52-5500rpm. What prop are you running? If linkage is going to full( on negine) that is is. You might want to do a compression tet, etc. She is 30 years old.
Steve Leone	posted 06-26-2001 08:01 PM ET (US) CAREFUL!!! What year is this Merc? If it is an inline 6 cylinder you better contact me. Steve.
Bigshot	posted 06-27-2001 10:54 AM ET (US) 71 is a inline 6. 100's were 5300, 115 was 5500, and 150 were 5700 I believe, why contact you?
66Sakonnet	posted 06-28-2001 09:42 AM ET (US) I'm going to check on the prop this weekend or next week. Throttle cable (original merc chrome unit) tops out, haven't checked the cable at the engine, but at full throttle the engine is only doing 4200 or so..., I thought that adjusting the cable to where I get 5000 or so a full throttle might help pulling up skiers etc.. also going to cut back to two batteries, thanks for the responses, I'll get back to you next week...
Bigshot	posted 06-28-2001 11:18 AM ET (US) If you can adjust it to get more than do so. It is easier to look at the side of the engine while throttle is at full and see if you are maxed out, if so you can't adjust doodoo. If your hull has water in it, that might be all she wrote.
66Sakonnet	posted 06-28-2001 02:49 PM ET (US) Bigshot, hull DEFINATELY has water in it! I had to repair the rear seat that covers the hyd unit for the trim/tilt... when I bored the holes to put epoxy and dowels in there a wet brownish bit of wood came up.. that leads to a question... how much water can the hull/foam absorb before it sinks?
Bigshot	posted 06-29-2001 10:35 AM ET (US) LOL! It won't sink! Just get slow as hell and start handling bad or even dangerously, something will eventually crack or break but it will still float. Might weigh so much it breaks your trailer. My 13 blew a hole in the hull about 1'x2' from the water(might have been a patch that blew off) and then a big crack where the gas tank goes where the foam collapsed and then galss cracked. then the wood got so bad the transom cracked in the corner from the top down about 6 inches in 1 day. That is when I got rid of it. Hind sight being 20/20, sell it now while it is still worth something.