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Old 11-10-2009, 07:15 PM   #1
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teething problems

was out testing p18 with 2.4 bridgeport to day. it was running good only has a 3 blade 22 pitch on and sounded like it was over reving and was only doing about 65 mph so would a 4 blade 26 pitch be better ? i dont have a rev counter yet can anyone tell me what i need and how to wire one up eg any sort of sender i need for the engine or does it go strate on





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Old 11-10-2009, 07:42 PM   #2
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Rev Counter

positive wire - negative wire - then grey wire in most Merc looms.

The gauge will have this marked on the rear.

Get the rev counter going before trying props as you could blow the motor over revving the tits off it.





gaZ
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Old 11-10-2009, 07:51 PM   #3
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Quote:
Originally Posted by gazza View Post
Rev Counter

positive wire - negative wire - then grey wire in most Merc looms.

The gauge will have this marked on the rear.

Get the rev counter going before trying props as you could blow the motor over revving the tits off it.





gaZ
thanks for that thats the next job. should have done it before i took it out
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Old 12-10-2009, 09:37 PM   #4
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i have got a 26p 4 blade prop to try does anyone no this prop mazco re4 ? what they like ?
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Old 12-10-2009, 10:29 PM   #5
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Quote:
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i have got a 26p 4 blade prop to try does anyone no this prop mazco re4 ? what they like ?
i think a 26 mite be too much,ive got 26lazer on my 18 with a 2.4,it runs 73 on a gps but only pulling 6500 revs,24 mite be the way to go
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Old 13-10-2009, 07:09 AM   #6
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Quote:
Originally Posted by the rat View Post
i think a 26 mite be too much,ive got 26lazer on my 18 with a 2.4,it runs 73 on a gps but only pulling 6500 revs,24 mite be the way to go


should the 2.4 only be ran at 6500 max ?
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Old 24-10-2009, 08:35 PM   #7
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Quote:
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i have got a 26p 4 blade prop to try does anyone no this prop mazco re4 ? what they like ?

took it for a try to day going from a 3 blade 21pitch to a 4 blade 26p i lost about 10mph . going to try a 23 and 24 next to see what i thinks best has anyone got any thoughts ?




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Old 24-10-2009, 10:02 PM   #8
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Quote:
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should the 2.4 only be ran at 6500 max ?
Keep it under 7k and it'll be fine.
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Old 27-10-2009, 06:11 PM   #9
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From what i understand more blades = better pull out of a hole and better accelaration but less top end. Therefore less blades = better top end but less pull out of a hole and slower accelaration.

I might be a complete saying that and be completly wrong, but it worked that way with my R20. It had a high 5 on and it pulled like a train but only got 55mph top end at about 5500-6000 rpm. I lifted the engine and replaced prop with 25 inch pitch laser 2. Unfortunatly i was unable to fully test as think engine was too high and cavitated when i trimmed it out, then i knocked the ends out the engine, but thats my own fault for not bleeding the oil injection system after the cap broke and half the oil tipped out, i topped it up and thought i got away with it. Yes ive answered my own question i am a complete
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Old 27-10-2009, 06:16 PM   #10
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Originally Posted by Carl_B View Post
From what i understand more blades = better pull out of a hole and better accelaration but less top end. Therefore less blades = better top end but less pull out of a hole and slower accelaration.

I might be a complete saying that and be completly wrong, but it worked that way with my R20. It had a high 5 on and it pulled like a train but only got 55mph top end at about 5500-6000 rpm. I lifted the engine and replaced prop with 25 inch pitch laser 2. Unfortunatly i was unable to fully test as think engine was too high and cavitated when i trimmed it out, then i knocked the ends out the engine, but thats my own fault for not bleeding the oil injection system after the cap broke and half the oil tipped out, i topped it up and thought i got away with it. Yes ive answered my own question i am a complete
have you re-built the motor yet carl???
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Old 27-10-2009, 06:22 PM   #11
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have you re-built the motor yet carl???
No not yet, not had a chance to get near the thing. Might sell it for spares or repair and get another engine soon as the financies allow, something a bit bigger or even a slightly later 2.5 200hp as think this 1 is only 2.4
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