alwhite00
Active Member
Hello:
I have a 86 Sea Ray Seville 21MC - Great boat - Love it. The boat aparently had a 4.3 originally - The PO bought it with a cracked block. He trans planted a merc 5.7 / 260 in place of the 4.3 - Boat runs great and tops out at just under 40 mph on the GPS.
It has a Alpha one first gen outdrive that I believe was original to the boat. I was looking at the outdrive and it has stamped into it 1:84 - I am asumeing that this is the gear ratio. I believe the 5.7 / 260 engines had a 1:50 gear ratio. I'm running a 14.25 / 21 3 blade aluminum prop.
Will this cause any problems? I am familar with car gear ratios but this boat thing is all greek to me. RPM's top out right about 4,400 - Everything seems to work corectly.
Can the GR be changed? Should it be changed?
thanks
LK
I have a 86 Sea Ray Seville 21MC - Great boat - Love it. The boat aparently had a 4.3 originally - The PO bought it with a cracked block. He trans planted a merc 5.7 / 260 in place of the 4.3 - Boat runs great and tops out at just under 40 mph on the GPS.
It has a Alpha one first gen outdrive that I believe was original to the boat. I was looking at the outdrive and it has stamped into it 1:84 - I am asumeing that this is the gear ratio. I believe the 5.7 / 260 engines had a 1:50 gear ratio. I'm running a 14.25 / 21 3 blade aluminum prop.
Will this cause any problems? I am familar with car gear ratios but this boat thing is all greek to me. RPM's top out right about 4,400 - Everything seems to work corectly.
Can the GR be changed? Should it be changed?
thanks
LK