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Conquistador_del_mar
02-18-2012, 12:32 PM
Is the Bravo ratio determined in the upper gear set or the lower? How about the Volvo Penta 270s or 280s? Thanks, Bill

smidgen too
02-18-2012, 01:20 PM
Bill on the Volvo 270 & 280 drive the ratio changes are made in the lower foot. Mark

Conquistador_del_mar
02-18-2012, 01:53 PM
Thanks Mark,
I was almost positive of the Volvos, but I could not remember where the ratio is determined with the Bravo. Hopefully someone will chime in. Bill

smidgen too
02-18-2012, 03:52 PM
Bill I called a friend and he said it's a combination of top and bottom gear sets on the Bravo drive.

Conquistador_del_mar
02-18-2012, 11:31 PM
Thanks guys. So if you install a 1.5 lower on a 1.36 ratio Bravo drive, you would end up with a strange ratio in between a 1.36 and 1.5? I am asking since I just bought an IMCO Extreme 1.36 drive with a conventional looking lower Bravo lower and want to install an IMCO SC lower foot on it. Thanks in advance, Bill

http://www.ebay.com/itm/330688999797?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

joseph m. hahnl
02-19-2012, 04:38 PM
Seems that the gearing in the lower of a Bravo is only different on Bravo III"S and just for diesel power, Gas appears to be all the same on all three Bravos.:crossfing:

http://www.mercruiserparts.com/Show_Pictures3.asp?dnbr=17721&ivar=images/COMMON/38666.png&inbr=952&bnbr=70&bdesc=DRIVESHAFT+HOUSING+AND+DRIVE+GEARS

http://www.mercruiserparts.com/Show_Pictures3.asp?dnbr=17721&ivar=images/COMMON/38668.png&inbr=952&bnbr=90&bdesc=GEAR+HOUSING%28BRAVO+I%29


http://www.mercruiserparts.com/Show_Pictures3.asp?dnbr=17721&ivar=images/COMMON/18725.png&inbr=952&bnbr=110&bdesc=GEAR+HOUSING%28BRAVO+III%29

Conquistador_del_mar
02-19-2012, 07:54 PM
So it looks like the Bravo 1 drive is determined by the upper gear set while the Volvo Pentas are determined by the lower gear set. It looks like there were no alternative sets for the Bravo 1 lower gear set - just the upper which is apparently what determines the ratio. Correct? Bill