View Full Version : How much ?
joseph m. hahnl
10-15-2009, 03:12 PM
How much horsepower would you say is needed to turn a 25P @4800 rpm?
a small block with 1.5 alpha.
I been having good luck with the stock quick silver mirage II. so let's go with that 3 blade stainless 25P quick silver mirage II
mrfixxall
10-15-2009, 03:18 PM
How much horsepower would you say is needed to turn a 25P @4800 rpm?
that depends? weight,BB SB drive ratio? with a 1.50 ratio,i would sat between 385-425 depending on the weight.
mattyboy
10-15-2009, 03:39 PM
wh@t drive r@tio??? I turned @ 25 pitch chopper to 4950 with my 310 ish hp ford & volvo 1.6 drive
sorry but see if you c@n guess wh@ts wrong with my l@top :rolleyes:
joseph m. hahnl
10-15-2009, 03:39 PM
that depends? weight,BB SB drive ratio? with a 1.50 ratio,i would sat between 385-425 depending on the weight.
I edited it, small block with the alpha 1.5.
This being the 350 mag with 4 barrel webber, it would have 300hp out of the box ? I'm thinking it's 650cfm carb.
mattyboy
10-15-2009, 03:45 PM
I guess number of Bl@des their sh@pe & di@meter come into pl@y too
joseph m. hahnl
10-15-2009, 03:49 PM
wh@t drive r@tio??? I turned @ 25 pitch chopper to 4950 with my 310 ish hp ford & volvo 1.6 drive
sorry but see if you c@n guess wh@ts wrong with my l@top :rolleyes:
I'd like to steer away from cleavers as I climb the drive to board the boat from the water
I guess number of Bl@des their sh@pe & di@meter come into pl@y too
okay, I been having good luck with the stock quick silver mirage II. so let's go with that 3 blade stainless 25P quick silver mirage II
mattyboy
10-15-2009, 04:22 PM
wh@t R your numbers now????? with the quick silver???
mike o
10-15-2009, 04:47 PM
Joesph, I was turning a 25p lazer II with the 4.3, V6, 1.85 drive to 5k with my 16. Your welcome to try it if you want to drive up a few exits (#24) to Squam.:kingme:
joseph m. hahnl
10-15-2009, 04:50 PM
wh@t R your numbers now????? with the quick silver???
I'm turning 21p between up to 4800 water pick speedo between 58 and 60mph
No slip should be at 63mph
If you are turning a 21@4800 a 25 will dog you down real bad! You would turn about 4000!
joseph m. hahnl
10-15-2009, 05:03 PM
If you are turning a 21@4800 a 25 will dog you down real bad! You would turn about 4000!
yes theoretically it would.
What I'm trying to figure out is how much more horse power I would need to turn the 25 at the same rpm
mattyboy
10-15-2009, 05:42 PM
100 more ponies
or 75 ponies & @ ge@r ch@nge up to 1.6
but keeping the 1.5 will give you more speed
the 1.5 @4800 25 pitch with 10% slip is 68
the 1.6 will be 64
mrfixxall
10-15-2009, 06:11 PM
Matty you need to blow the crap out from under you keys on your laptop,mine does that once in a whyle..if that dont fixx it plug in a new keyboard:)
Sweet Cheekz
10-15-2009, 06:22 PM
4800 RPM's on my dyno sheet showed 390 hp turning a 1.5 sbc with alpha ss 1.5 Gear ratio going 73
25 Pitch 3 blade from Grizz
16'
SC
Lenny
10-15-2009, 07:23 PM
I say 350 at the PROP. So 375-ish up front.
My un-educated guess. :)
joseph m. hahnl
10-16-2009, 08:34 AM
OK thank you gentle man. so it would appear that a minimum of 390 to 400 HP.
Now how to achieve this in a recession:kingme:
Maybe a list of mods with there potential HP increase:shades:
Eddlebrock makes a nice pump up kit,but I don't want to re-cam it, as all the mods will be done with the block still in the boat.
"no holes to the engine compartment":bonk:
I have old style heads, so Vortec heads lead to a new intake manifold which would lead to a new lung"carb" as I wouldn't want it to be asthmatic:screwy:
It seems a pro charger packs the most bang for the buck.
this motor only having a 2 bolt main makes me weary of that.but I'm not looking to excessively wind her up" yah I say that now:drool:".Just get more out of her at cruise:woot:
what do you:idea:
mattyboy
10-16-2009, 08:57 AM
leaving no stone unturned for increases in speed from small stones to big stones
1. prop tweaking
2. removing weight like new exhaust
3. engine mods
4. getting a shorty
5. or just putting all your stones in one basket and go for it
each item can except 1 and 4 go hand in hand like going to alum heads might see an increase in power and a decrease in weight or making a mild engine that needs to breathe then having to upgrade the exhaust.
no matter what you do the old addage $1000 per mph seems to hold true with the shorty being the best return on investment
mrfixxall
10-16-2009, 09:51 AM
OK thank you gentle man. so it would appear that a minimum of 390 to 400 HP.
Now how to achieve this in a recession:kingme:
Maybe a list of mods with there potential HP increase:shades:
Eddlebrock makes a nice pump up kit,but I don't want to re-cam it, as all the mods will be done with the block still in the boat.
"no holes to the engine compartment":bonk:
I have old style heads, so Vortec heads lead to a new intake manifold which would lead to a new lung"carb" as I wouldn't want it to be asthmatic:screwy:
It seems a pro charger packs the most bang for the buck.
this motor only having a 2 bolt main makes me weary of that.but I'm not looking to excessively wind her up" yah I say that now:drool:".Just get more out of her at cruise:woot:
what do you:idea:
A two bolt main wouldnt hold me back :) i use to run a two bolt main 314 in my donzi,lasted 15 years and the only reason i took it out out was because i wanted to go faster..i would wing it to 5600 all day long....
Powered by vBulletin® Version 4.2.5 Copyright © 2024 vBulletin Solutions Inc. All rights reserved.