1975 23 foot fiberglass with cuddy

Jakem

Master Chief Petty Officer
Joined
Apr 25, 2021
Messages
890
I am wondering about prop size for my old boat. It had a 21p when I bought it. I switched it to a 19. It's been suggested I run a 16 or 15. Does that sound right. Boat revs out at about 3500 ram for causing speed wich seams high to me
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,033
What boat ?----What engine ?----And what condition is the motor in ?-----If motor is sick then changing props means nothing !
 

Jakem

Master Chief Petty Officer
Joined
Apr 25, 2021
Messages
890
It's a campion boat with a ford 302...the engine is being worked on timing wise but ran strong before.
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
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Jul 23, 2011
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47,297
If I recall from your other posts, your down slightly on compression
 

Bondo

Moderator
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Apr 17, 2002
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70,465
I am wondering about prop size for my old boat. It had a 21p when I bought it. I switched it to a 19. It's been suggested I run a 16 or 15. Does that sound right. Boat revs out at about 3500 ram for causing speed wich seams high to me
Ayuh,..... You need whatever prop pitch that allows the motor to run at 4400/ 4800 rpms, at Wot, trimmed, with yer average load of fuel, 'n gear aboard,.....
 

QBhoy

Fleet Admiral
Joined
Mar 10, 2016
Messages
8,286
It's a campion boat with a ford 302...the engine is being worked on timing wise but ran strong before.
Get the timing sorted and take it from there. Once that’s sorted, tell us what outdrive she is abs her ratio of you know. But as she is…you’re about 2000 rpm low at least.
 
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