Hello Everyone,
I posted a message last year but never got any responses. I'm looking
for information once again on my engine upgrade. First a little
background.... I have a 1982 Uniflite that used to have 270 hp
crusaders, 1.91:1 Velvet drive Transmissions, and 18 x 17 inch props.
My boat would only cruise between 12 and 15 knots. I decided to
upgrade my tired motors and put in a pair of used 350 hp crusaders.
The motors I bought came with 2.57:1 Transmissions so I initially
installed these into my boat. I borrowed a pair of 18 x 22 inch props
from a friend and the boat would cruise at 9 knots and top out at 4400
rpm. At this point I spoke with Sea-cure technologies to find out how
34 ss was set up from uniflite. They told me those uniflites came
with the 1.52:1 Transmissions and 17 x 18 props. So, thanks to
craigslist, I found a pair of 1.52:1 Velvet Drives and put them into
my boat. Took the boat out for a cruise with the 18 x 22 props,
topped out at 2000 rpm and 10 knots. Next I took off the 18 x 22's
and put back on my original 18 x 17's. Took her out for a run and she
did 14 knots topped out at 3200 rpm. So, my question, will going to
the 17 x 18's bring my rpms up and my cruise speed up? Is there
anyone else out there with a 34 uniflite with 454's?
Thanks
Pete
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