Merc props

[gspig]

It seems that trying to find prop specs for a given Merc prop number must be a national secret. I have searched the net for 4 days and still haven't turned up a useful source yet.<br />Does anyone know of such a list and where to locate it?

 

[Don S]

Re: Merc props

Your Mercruiser dealer has a book with the P/N size cross reference in it.

 

[RatFish]

Re: Merc props

I typed the part # in google. After about 3 minutes of going through the results, I was able to figure out the prop specs. <br /><br />Some online retailers list Merc part #'s along with prop specs. This may be fine for a one time look-up but I would not want to do it often. As Don said, your best source would be a Mercruiser dealer.

 

[gspig]

Re: Merc props

My nearest Mercruiser dealer is 3 hours away. I am trying to get a couple of cheap e-bay auctions to try different prop pitches, but most of the sellers are listing prop part numbers. I am finding that diameters are a feature as well as pitch that I want to watch out for.

 

[Bondo]

Re: Merc props

I am finding that diameters are a feature as well as pitch

Forget about the Diameter.............<br /><br />You have No Control over it....<br />Diameter is a factor in Blade Design......<br />Pitch is What you should be concerned with....<br />Some Engineer, somewhere has Already figured out What Diameter is Needed to work with whatever blade design that particular prop has.....

 

[gspig]

Re: Merc props

Well, I found diameter does matter because some Mercury outboard props fit Mercruiser I/Os. I bought a 21p prop off e-bay and the diameter is ~13 inches. The prop hub is nearly 1/4 inch diameter smaller than the prop I am using. I put the 21p prop on and I was making it slip at 2400 rpm. If I could get a list of Merc prop numbers and specs, I could tell before I buy if this will be a problem. Is there anyway to decifer the code?

 

[tommays]

Re: Merc props

what do you mean by slip??? is the hub spun or is the prop cavatat<br /><br />tommays

 

[gspig]

Re: Merc props

Cavitating the prop. The exhaust is able to get around the outside of the hub and into the blades.

 

[tommays]

Re: Merc props

that was not the diameter BONDO was talkng about he was refering to the total dia of the prop blades it sounds like that prop as for a smaller diameter gear case<br /><br />it is the down side of buying used parts some times you win some times not<br /><br />tommays