How much ?

[joseph m. hahnl]

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]

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]

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]

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]

I guess number of Bl@des their sh@pe & di@meter come into pl@y too

[joseph m. hahnl]

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]

wh@t R your numbers now????? with the quick silver???

[mike o]

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]

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

[MOP]

If you are turning a 21@4800 a 25 will dog you down real bad! You would turn about 4000!

[joseph m. hahnl]

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]

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]

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]

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]

I say 350 at the PROP. So 375-ish up front.

My un-educated guess. :)

[joseph m. hahnl]

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]

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]

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....