Supercharger Applications

[Guest Draken]

I'm a bit confused . Here goes:

#1)Does an engine have to have a low CR (like in the 8's:1) to be supercharged?

 

#2}Also, why are 4-bolt mains better than 2-bolt mains?

 

#3)Are Camaro/Firebird LT1's 2-bolt mains?

 

Thanks.

[grumpyvette]

(1) no an engine does not HAVE to have 8:1 compression to work with a super charger but it will work much better that way, what a super charger does is cram more fuel air mix into the cylinders than can normally fit at standard atmospheric pressures , to get the most efficientcy you need a lower standard compression ratio to allow room for the extra volume of fuel air mix to effectively fill the chamber. here play with this, youll see what Im talking about,

 

http://www.turbofast.com.au/TFcomp.html

 

http://www.turbofast.com.au/TFcompB.html

 

http://cochise.uia.net/pkelley2/DynamicCR.html

 

try to figure a 8.5 dynamic cpr under 10 lbs of boost youll see why you need a static compression around 7-8:1

 

(2)4 bolt maim caps have greater strength holding the crank in the block, this is especially helpfull on supercharged engines

 

(3)most are 2 bolt but there are exceptions

 

10125327...350...92-up...2 or 4...Gen.II LT-1, reverse flow cooling

10125327...350...96-up...2 or 4...Gen.II LT-4, reverse flow cooling