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#3
06-14-2013, 10:36 PM
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the mercury mirage works well with the 3.7l engine, try to prop it out o turn at least 4500 rpm
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#4
06-17-2013, 08:26 AM
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I was running WOT Saturday right at 5000 RPM. Should I be getting higher or is that about right?
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#5
06-17-2013, 03:36 PM
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They say you should get higher, I don't like running that high myself though, scared of blowing her up. I think the more important thing is to not lug the engine while cruising.
__________________
1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 1979 Marine Trader 44, twin Ford Lehman 120s 2006 Panga 14, Tohatsu 20
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#6
06-18-2013, 10:41 AM
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If the specs for your engine say 4500 WOT is ideal then yes, I'd think that a 14.5 x 17 was worth a try. Certainly don't want to over rev it, but you can always throttle back if you find that's happening.. then switch back to your old prop or try another one. Like Bradford said, it's more important to not lug the engine than to slightly over rev it.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#8
06-18-2013, 08:10 PM
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that 3.7 doesn't mind to lug, if it were an outboard. I'd say prop it out to the top end of the rpm range, but the 3.7L is a torque engine, its doesn't like rpm, teh valve train really doesn't like rpm, prop it out to run around 4200-4500 rpm and you'll be fine. My old roommates 3.7 that I had hot rodded a bit turned 4800 and we had some rocker arm issues from time to time.
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#9
06-19-2013, 12:55 PM
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Thanks for the replies guys....If engine runs out good the rest of summer I have a complete 4 barrel setup to go on this winter along with a set of rollers to tighten up the top end and a little polishing just for sh*ts and giggles. Just more
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#10
06-23-2013, 09:02 PM
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Prop performance on shakedown trip #3.
Prop# 14x21 stainless=3800rpm-30mph. Prop#2 14.5x17 alum.=4600rpm-33mph. Guess I will be looking for a 19p now huh? Also waiting in line at dock this evening and lost forward on shifter..reverse is fine but no forward. Any ideas ? Shifter appears to be original '78. Oh and to make things worse Wifey smoked me fishing today!!! I love it. 
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