View Full Version : Prop question
ffjoey
09-28-2005, 06:03 PM
I have a 182 Medallion. It has a 14 1/2 x 19 prop. The prop is a little nicked up but not too bad.However the motor seems to outrun the prop. Should I move to a 21 pitch?
ffjoey
09-28-2005, 06:07 PM
I have a 182 Medallion. It has a 14 1/2 x 19 prop. The prop is a little nicked up but not too bad.However the motor seems to outrun the prop. Should I move to a 21 pitch? I need to add it is a 4.3 Merc with an Alpha 1 drive. Thanks
4200 to 4600 is what is in the manual as long as you are in that range you are fine.
Phil
ffjoey
09-28-2005, 07:01 PM
It runs all the way to 6,000. Also 15 minutes after I took it out the motor blew. Mind you I did not stay at 6,000. Come to find out it was an auto not marine motor. The block is still good. Can an auto block be used for marine?
boldts
09-28-2005, 07:57 PM
Wow 1,400 rpms to lose? I don't think the tac is reading correctly if that is the case. I mean at 200 rpms for every inch of pitch added, you need to be running at least a 26" pitch prop? Something is out of wack here.
It runs all the way to 6,000. Also 15 minutes after I took it out the motor blew. Mind you I did not stay at 6,000. Come to find out it was an auto not marine motor. The block is still good. Can an auto block be used for marine?
The blocks are the same, but the pistons, cam, bearings are different also the casting plugs (freeze out plugs are brass). They trun up on Ebay pretty regular, also I think one of the members has a good take out. Put a post in the wanted section.
Phil
mrfixxall
09-30-2005, 10:03 AM
check the drive coupler to see if it has signs os ware???
Hmmm did you smell rubber burning?
ffjoey
09-30-2005, 11:23 AM
No funny smells. Maybe the tach is off but the motor does outrun the prop. At 3/4 it feels good, when you give it more it seems to do nothing more in the way of speed. The motor blew because the rod bearing in the # 3 cylinder was not seated correctly and spun. The motor still ran but it really tore up and metal shavings were everywhere. Not to mention the terrible clunk from the loose rod.
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