I have a 1980 Entertainer with a 5.7 V8. I have a 21 pitch prop on it right now, and it will hit right at 60 GPS running 4800 to 5000 rpms. I would really like to keep the RPMs at or below 4800. Would changing to a 23 pitch prop lower my rpms? How much additional speed would that most likely add? It'll pull your arms off with the 21 when skiing ... do any of you think a 23 would reduce my pulling power too much? Thanks for any advice ...
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Finding the perfect pitch
- Thread starter Jamey
- Start date
powerstroker
Member
the 23p prop will put up around 4400 to 4600 rpm and your hole shot wont be as good!
daren34
Member
alot will depend on blade shape and size
what prop are you running now
brand name?
dia?
for stern drives i like the mirage or mirage plus from merc
you might liik for a rev 4 in a 21 to lower the revs a bit
or having more cup added to your 21 will lower the rpms
daren
if you are running a 14 x 21 and go to a 15 x 21 you will lower your rpms also
what prop are you running now
brand name?
dia?
for stern drives i like the mirage or mirage plus from merc
you might liik for a rev 4 in a 21 to lower the revs a bit
or having more cup added to your 21 will lower the rpms
daren
if you are running a 14 x 21 and go to a 15 x 21 you will lower your rpms also
If your exhaust is through the prop, can make up a lot on the bottom end with prop vents... For my diplomat i/o with the v-6 (off the top of my head)
turbo 26" vented, pretty good out of the hole, 60 top end gps at around 4600, some problems with blowout when turning with it trimmed up. If this one didn't blow out, it would be the best all around performer... it beats the 23' laser 2 props out of the hole.
lasr 2, 23" newer hub style, med size plastic vent inserts, best all around performance, good out of the hole,top end around 55-57, 4700-4800
laser 2, 23" earlier version, solid hub, smaller /square vents, not as good out of the hole... 4700-4800
Solas 4 blade 21", (titan) no vents, like a rocket out of the hole, top end at 50,wish I hadn't listened when everyone said to go down in pitch when going to 4-blade. I bet a 23" in this prop would be right on the money... It handles turns better (and I mean turns... without blowing out),is a lot smoother running overall, if it didn't suck on the top end would never come off the boat... as it is i run a laser 2 when playing and the solas when pulling skiers...
Those are just props I currently own. I tried another 8 or 10 that I either borrowed or sold after.
I tried the mirage in a 23' but it was a little slower and a little worse out of the hole than the laser 2 on my set-up...
I'll let you know what happens when I add another 200 horsepower in the next few weeks...
turbo 26" vented, pretty good out of the hole, 60 top end gps at around 4600, some problems with blowout when turning with it trimmed up. If this one didn't blow out, it would be the best all around performer... it beats the 23' laser 2 props out of the hole.
lasr 2, 23" newer hub style, med size plastic vent inserts, best all around performance, good out of the hole,top end around 55-57, 4700-4800
laser 2, 23" earlier version, solid hub, smaller /square vents, not as good out of the hole... 4700-4800
Solas 4 blade 21", (titan) no vents, like a rocket out of the hole, top end at 50,wish I hadn't listened when everyone said to go down in pitch when going to 4-blade. I bet a 23" in this prop would be right on the money... It handles turns better (and I mean turns... without blowing out),is a lot smoother running overall, if it didn't suck on the top end would never come off the boat... as it is i run a laser 2 when playing and the solas when pulling skiers...
Those are just props I currently own. I tried another 8 or 10 that I either borrowed or sold after.
I tried the mirage in a 23' but it was a little slower and a little worse out of the hole than the laser 2 on my set-up...
I'll let you know what happens when I add another 200 horsepower in the next few weeks...
kingsbiship
Member
I have a vented 26" Turbo I'm selling... It will definitely lower your RPMs, don't know how much, but
will refund money if not happy! $150 + mail
will refund money if not happy! $150 + mail