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02-05-2010, 12:23 AM #1Member
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Noob: Motor Tune VS Prop question 2.0 merc
I hope this is in the right forum,
I feel kinda dumb asking this , but i'm a few beers in:
I swapped props from a stock merc 23p to a laser II 21p . the new prop has the tuning vent system , the old prop did not , so I basically tuned the motor originally (low speed advance) to run the best holeshot with the old prop . Now I can adjust the prop to the motor.
the top end is great and i can spin this one to 5800 , I could only spin the 23 to 5200. But the hole shot is much slower (cavitation) with the 21p/ no plugs in , much worse holeshot than the 23p.
should I tune the prop with the plugs to the motor as is , or tune the advance to the best the new prop will handle when I get the plugs sorted out? or both?
I am assuming what i eventually am trying to achieve is the motor reving as quickly as possible with as little slip (cavitation) of the prop as possible for the fastest hole shot . Is this correct ? or am i lost?87 Stratos 181 Pro
150 Merc XR2
21P laser 2
52-53 gps @ 5800
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02-05-2010, 12:32 AM #2
Not sure where your hull weighs in, but the Laser series props are not made for the "above average" weight hulls, imho.
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02-05-2010, 12:58 AM #3Member
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not sure on the weight , but she's not a pig like a ranger,lol. the 21 or the 23 laser are the recomended prop from merc. They only go back to the XRI or 6 though for 150's. at least thats the best I could find for the combo.
87 Stratos 181 Pro
150 Merc XR2
21P laser 2
52-53 gps @ 5800
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02-05-2010, 08:21 PM #4
That motor should have no problem with the 23 prop. I had an 84 mariner in factory spec that would spin a 24" with no problem to 5500-5800 RPM on an 18 1/2' skeeter.
It might be time for a compression test .
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02-06-2010, 11:37 PM #5Member
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Thank you everyone for all of the help and comments. Spent some time getting the prop sorted out today and definatly very happy with the results. I was able to get the hole shot tuned in to about 2-3 sec on plane. very different than before as well, the nose comes up a bit and the boat just goes, nice and smooth, the motor sounds a lot less stressed and gets into the rpm band quickly. the best i was able to get today (20-30 mph wind 1-1 1/2' waves) was 52 on GPS. i think this is about the best I can get with my current setup and the boat handles well also you guys rock !
87 Stratos 181 Pro
150 Merc XR2
21P laser 2
52-53 gps @ 5800