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Prop size for 270 outdrive

dmanars

Member
I need a new prop for a 270 ou

I need a new prop for a 270 out drive. But I know nothing about props. little info to get me started
 
"If you do not know what the p

"If you do not know what the previous propeller size/pitch was, it will be "Trial & Error" for you.
Prop selection is involved. We can't just grab a prop and expect the size/pitch to be correct for our hull.... or more importantly, Your Engine!!!!!...... even if someone else suggests that it will work for you!


You must start with a fully tuned engine..... everything!!!!!!
Fuel tank pick up tube
anti-siphon valve
fuel filter
carburetor work (if need be)
Inition timing for both Base and Total Advance and so on!

Now using your WOT RPM specs from your OEM Volvo Penta manual, you test a few propellers to see which one allows for your correct WOT RPM.
Boat must be loaded fairly close to how you would normally be loading it.
(IOW's, don't set yourself up for a propeller with just YOU on board, if the plan is to have a full crew most other times)

Several propellers may give you the correct wot/rpm, but you may also find that one works particularly better than another, for example.
Again, it's Trial & Error!

NOTE: the WOT RPM is a test only...... and not be to an RPM to operate at for normal cruising.

."
 
"And if You do not have all of

"And if You do not have all of that, at least engine type and estimated speed might help."
 
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