Prop size- F36

Stripermann2 · Post by **Stripermann2** » Mon Oct 19, 2009 3:31 pm

My good friend has a 81-82 F36 Sedan, 460 Fords.

What is the correct size prop for this boat? He now has 21x22 on since he's had the boat. Something says it's not the right size...

Thanks for your input, I'll pass along the info to him.

rossjo · Post by **rossjo** » Mon Oct 19, 2009 4:05 pm

Sounds reasonable for 460 big blocks ... depend son transmissions gear ratios ... why do you ask?

Stripermann2 · Post by **Stripermann2** » Mon Oct 19, 2009 4:27 pm

Thanks Ross,

The reason for the question was that although his boat runs very well, bottom is clean and no other performance issues, he cannot attain a rpm over 3400. After speaking with another friend of ours who has an F36 with 440's in it and runs 20x19 props, the question arose that maybe he was over-propped.

prowlersfish · Post by **prowlersfish** » Mon Oct 19, 2009 7:25 pm

A friend had one with 454 and it ran 20x19 I belive . I and runing 22X22 but I have diesels And I know there bigger then another f36 that was hauled out next to me .(w/440)

alexander38 · Post by **alexander38** » Tue Oct 20, 2009 5:41 am

Running 454's with 22x22 = 27knt on a 36'

rossjo · Post by **rossjo** » Tue Oct 20, 2009 5:55 am

What transmission gear ratio? Without that, we're comparing apples and oranges here.

alexander38 · Post by **alexander38** » Tue Oct 20, 2009 5:57 am

true I'll look tomorrow

prowlersfish · Post by **prowlersfish** » Tue Oct 20, 2009 6:24 am

No matter what the gear is this boat is over proped by the rpm readings . the 460 was the replacement for the 440 . I would check the tachs make sure they are right first ,

Stripermann2 · Post by **Stripermann2** » Tue Oct 20, 2009 2:24 pm

Not sure of the gear ratio. Thanks, guys...I'll pass the info along.

prowlersfish · Post by **prowlersfish** » Tue Oct 20, 2009 5:50 pm

alexander38 wrote:Running 454's with 22x22 = 27knt on a 36'

Thats not on a F36 Is it ? I belive they came with 20" wheels .

alexander38 · Post by **alexander38** » Tue Oct 20, 2009 6:04 pm

You know it's not..

gjrylands · Post by **gjrylands** » Wed Oct 21, 2009 7:00 pm

My F36 has 20x21 props with 1 3/8 shafts. Chrysler 440 engines with 1.91:1 Velvet drive trans & reduction gear. This was the stock setup in '79