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Which spercharger?

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Dwight

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Discussion starter · #1 ·
How do you know which supercharger to use? I am referring to the size of a roots style. Do you use a 177, 240, 671,871 ?
Is it all based on how much power you want to make? I wondered if it is smarter to run a larger charger at a slower pace to safeguard against heat? Thanks Dwight
 
#2 ·
A lot of factors here.

Basics:

Smaller SC more effecient at lower engine rpms and lower total boost

Bigger SC more effecient at higher engine rpms and boost

Smaller SC more effecient on smaller motors

====================================

I've seen people with 454's/502's go from a 177 and 250 SC and lose power going up to the 8-71's.
 
#3 ·
Dwight said:
How do you know which supercharger to use? I am referring to the size of a roots style. Do you use a 177, 240, 671,871 ?
Is it all based on how much power you want to make? I wondered if it is smarter to run a larger charger at a slower pace to safeguard against heat? Thanks Dwight
Click to expand...
Uhoh,maybe you shouldn't of went with me on that sea trial Dwight. If you go and buy a huffer just make sure to tell Laura it wasn't my idea. :rolleyes:
Are we going to Johnsons Speed Shop after work? :laugher:
 
Discussion starter · #4 ·
I Love the sound of them huffers. I first have to get the boat back together....
I will tell Laura that you are going to hook me up :laugher:
I see so many different size chargers out there I was wondering if it makes more sense to run bigger or smaller?
 
#5 ·
As you have wittnessed first hand my 177 blowers do the job quite nicely and are by far the most inexpensive way to go.
I will call Laura and just tell her what ever Dwight buys for the boat I have NOTHING to do with it. :laugher:
 
#6 ·
How many cubes
how much boost
cam/head/exhaust efficiencies

All the above will determine how much air you can pack in a cylinder given a specific blower.
Each blower has a rating of X cfm per rotation. But each one has a max rpm too.
In the examples you've given, they're all roots type.
In my opinion, overdriving a roots by more than 15% is too much on a boat and creates too much heat, therefore adverse effects.

DAVE
 
#7 ·
Discussion starter · #8 ·
Thanks cfm. I will ck it out.
DS that will for sure make her nervous :laugher:
PC, I have a 502 mpi now so that would be the engine I would convert to carb and charger. I think Scott has a great blueprint of how to go. I was just wondering if a bigger charger would work as well or better than Scotts set up.
 
#9 ·
Dwight said:
Thanks cfm. I will ck it out.
DS that will for sure make her nervous :laugher:
PC, I have a 502 mpi now so that would be the engine I would convert to carb and charger. I think Scott has a great blueprint of how to go. I was just wondering if a bigger charger would work as well or better than Scotts set up.
Click to expand...
If you have a 502 MPI, why wouldn't you consider a Whipple? Roughly 600-625 HP and in a pretty reliable package.
 
#11 ·
SeaRay Jim said:
If you have a 502 MPI, why wouldn't you consider a Whipple? Roughly 600-625 HP and in a pretty reliable package.
Click to expand...
Depending on time frame.......availability may be one factor.
 
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#14 ·
What's a spercharger , anyway ???

I / we have may be talking about the wrong thing.


:shocked: :shocked: :laugher: :laugher: :laugher:

It's late. I'm getting goofy. Sorry. :bigsmile: :bigsmile: :laugher: :laugh:

I messed up too !! Had to edit it. :bigsmile: :laugher:
 
#15 ·
cfm said:
What's a spercharger , anyway ???

I / we have may be talking about the wrong thing.


:shocked: :shocked: :laugher: :laugher: :laugher:

It's late. I'm getting goofy. Sorry. :bigsmile: :bigsmile: :laugher: :laugh:

I messed up too !! Had to edit it. :bigsmile: :laugher:
Click to expand...
Watch out,cfm is on a roll. :shocked: :rolleyes:
 
#16 ·
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<a href='http://www.smileycentral.com/?partner=ZSzeb008_ZNxdm006YYUS' target='_blank'><img src='http://smileys.smileycentral.com/cat/4/4_1_213.gif' alt='Laugh' border=0></a>
 
#17 ·
cfm said:
<a href='http://www.smileycentral.com/?partner=ZSzeb008_ZNxdm006YYUS' target='_blank'><img src='http://smileys.smileycentral.com/cat/16/16_2_106.gif' alt='Roll Over' border=0></a>

<a href='http://www.smileycentral.com/?partner=ZSzeb008_ZNxdm006YYUS' target='_blank'><img src='http://smileys.smileycentral.com/cat/4/4_1_213.gif' alt='Laugh' border=0></a>
Click to expand...
Dude you just kill me sometimes. :laugher: :laugher: :laugher:
 
#19 ·
Dwight said:
Hey Scott, did my wife scare ya with the phone call?
I should of had her play it up... :laugher:
Click to expand...
<a href='http://www.smileycentral.com/?partner=ZSzeb008_ZNxdm006YYUS' target='_blank'><img src='http://smileys.smileycentral.com/cat/36/36_14_1.gif' alt='Phone Shocker' border=0></a>

:laugher: :laugher:
 
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Dwight
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