Prop Codes and compatability

[MickLovin]

Ok I took off my prop from my 75HP 1980 Chrysler, it is a stainless steel prop with a code of A511265, it may be a volvo penta prop as when I had it repaired, that is what they called it. Here's the thing, my prop on my 100HP is smaller in diameter and has a code of 528.23., as I can't find these codes in the parts list I am presuming maybe that the original chrysler prop with the code 528.23 is a 23 pitch????? but I don't know for the life of me what the 75hp volvo penta prop is, I was hoping it to be a 17 or 19 as I am going to try it on my 100HP as it has been balanced. The 75hp fits on the 100hp without and trouble.

Can anyone help with these codes and maybe pitch sizes.

 

[pnwboat]

Re: Prop Codes and compatability

The stainless steel prop code A511265 is a 21 pitch prop. Couldn't find anything on the Chrysler prop 528.23. Not sure what size boat you have, but typically I've only seen props between 15, 17, or 19 on most set-ups with Force motors. There's always exceptions so, the best way to check is to see what your RPMs are at WOT. Should be around 5500 at WOT.

 

[MickLovin]

Re: Prop Codes and compatability

I actually had 5000 rpm on my 75hp so this may explain why as it should have a 19 or 17 pitch on it the book says 17, ok so I have a 100hp and I am hoping this 21 pitch prop may be ok for it.

 

[pnwboat]

Re: Prop Codes and compatability

Sounds like you should be propped just about right, but the true test is out on the water. I suspect you should be able to go at a pretty good clip with that 21 pitch prop at 5000+ RPMs.

 

[Frank Acampora]

Re: Prop Codes and compatability

528-23 is the Chrysler code for a stainless steel (or aluminum--I forget), 13 inch diameter, 23 pitch prop. The prop is stock Chrysler but was made for them by Michigan. I would need to go down into the garage and look at my collection of props to tell you the material of 528.

That year Chrysler has a number of prop options so you need not worry about replacing. You can use props for Force engines prior to 1994 and some Mercury props, from the small gearcase 90 for example, will also fit. Many 15 spline 13 inch diameter props can be modified to fit too. You only need to know that your gearcase is considered the 4 inch diameter.

 

[MickLovin]

Re: Prop Codes and compatability

Hey Frank, the 528.23 is aluminium sorry I should have stated that, why is it though being a standard prop for Chrysler motors are they specifying 15", 17" or 19" the only motor I have seen with more than this choice is the 120HP, I think I will leave the 21" pitch s/s prop on from the 75hp, it does seem bigger than 13"diameter though, will diameter affect my performance? So I have gone from 23 to a 21 pitch prop as well in doing this. My only concern with a s/s prop is that they have no give and I have done a gearbox before .

 

[Frank Acampora]

Re: Prop Codes and compatability

13 is the nominal diameter. It is actually about 13 1/4 or so. Even 21 pitch is going to be too much for your 75, but hey, it's your choice. Even the 120 unless on a very small hull will not like the 21 pitch.

The only time I used a 21 pitch prop was with the 125 on my 14 foot go-fast. Even my 150 on my 21 foot cuddy uses a 19 pitch

Everyone has an opinion about stainless--mine is that it does no more damage to a gearcase than an aluminum prop and you should not be in the habit of plowing the river or bay with it. If I can help it, I never use aluminum props. Stainless gives about 200 RPM more than the same brand, diameter, and pitch prop in aluminum.

Larger diameter will have some effect on rpm, dropping it a little but again, everyone has an opinion on that. Certainly, the difference of 1/4 to 3/8 inch diameter will not do much, PITCH will be the controlling factor. If you have some mates with Chrysler engines, try to borrow a 17 and a 19 pitch. You may be surprised by the difference.

 

[MickLovin]

Re: Prop Codes and compatability

Thanks again frank, unfortunately at the moment I only have that 23" pitch aluminium which was on the 100hp when I got it, and the 21" pitch s/s prop was on the 75hp when I got it, now I have a few contacts due to trying to sell my 75hp on ebay, I will try and get a 19 or 17" prop for experimental purposes . I think I would notice the difference from the 23" ally to the 21" s/s which I now have on the 100hp as it originally had the 23".

 

[MickLovin]

Re: Prop Codes and compatability

Oh the s/s 21" was originally off the 1980 75hp which I did the gearbox in, my other 76 model 75hp chrysler has a prop which is on a 2 piece gear box, possibly is 17"

 

[1FASTLASER]

Re: Prop Codes and compatability

Frank,
I have to give you a hats off as usual. I .... like you get so frustrated when you hear "don't use a stainless prop.. you will tear your lower up. The benefits far outweigh the aluminum. I keep an aluminum strictly for a spare. Most stainless props have either a rubber "shock absorbing hub" and/ or a remove able hub system that will take the brunt of a blow just like an aluminum. You can wack a prop hard enough whether or not it's aluminum or stainless and hurt the lower.