centrifugal blower sm blk motor

[Crizila]

What damper are you using? Double or single keyway? Thanks, John

 

[Budnicks]

Crizila welcome to FBBO forum, maybe go to the welcome wagon section & introduce yourself, give a description of you car some photos are always nice too... How big of a supercharger ?, How much boost/psi will you be running ?, what kind of Centrifugal Supercharger are you using {Prochagger, Eaton, Novi, Powerdyne etc.}?, how many cubic inches ?, what compression ratio ?, is it a LA or Magnum Small block ?, what material is the crankshaft {cast iron/ductile iron or forged steel} ?, what is the final purpose for the car/vehicle {racing, street/strip, cruising} ?, I have run a Powerdyne CSC, 7psi boost, on a slightly modified 5.2ltr Magnum in a late model Dakota, with just stock single key way & balancer with no problems, just a street toy, not over kill, no racer.... If your doing a race engine or palnning on running at the track allot, a SFI cerified, ATI, Fluidampr or ProRace dampner or equivalent would be a really good idea, they will sometimes move the pulleys out because of the much thicker style & weight of dampner/harmonic balacers, you may have to run custom spacing for the supercharger to get everything to line up properly... IMHO dual key-ways aren't really completely necessary until you go over 10psi or have serious compression or over-driving the supercharger allot, it really depends on many factors, but mostly the higher the boost the larger the drag on the hub/dampner/harmonic balancer... Good luck

 

[Crizila]

This will be a race only application. Block is a stock LA 360. Had it sonic tested and magnifluxed and all checked good. It will be half filled with splayed 4 bolt mains on the center 3. It will end up being a 408 with a forged eagle crank and H beam rods, Icon blower pistons ( around 8.8:1). Haven't made a cam choice yet. Heads are fully ported iron ram magnums. Going with a centrifugal blower ( probably a "Pro-charger D1SC kit ). Looking to make a max of 700HP on race gas. Boost in the 10-20psi range. I will probably go with a dual keyway dampner with OEM dimensions ( for sure SFI certified ). Thanks for your feedback Budnicks. I will look in to the dampners you mentioned.

 

[HEMI-ITIS]

I went with the ATI Superdamper with double keyways.Do it right from the start:headbang:

 

[Budnicks]

Good luck

This will be a race only application. Block is a stock LA 360. Had it sonic tested and magnifluxed and all checked good. It will be half filled with splayed 4 bolt mains on the center 3. It will end up being a 408 with a forged eagle crank and H beam rods, Icon blower pistons ( around 8.8:1). Haven't made a cam choice yet. Heads are fully ported iron ram magnums. Going with a centrifugal blower ( probably a "Pro-charger D1SC kit ). Looking to make a max of 700HP on race gas. Boost in the 10-20psi range. I will probably go with a dual keyway dampner with OEM dimensions ( for sure SFI certified ). Thanks for your feedback Budnicks. I will look in to the dampners you mentioned.

It sounds like your doing the right things... O-ring the block & dead soft solid copper head gaskets, is also a good idea too, anything over 10psi, if your going to run any were near 20psi, it's absolute must, especially under high boost conditions... I do it, with all my roots type blower apps, especially in an all out race application with lots of boost... You might want to look into a ignition system that backs off timing under a given boost pressure, like MSD with interchangeable chips or others, it will help save parts in the long run, detonation will kill/crack your block or crankshaft pretty damn fast, a small bore engine like yours is susceptible to high boost pressures, pulling the timing back at higher boosts & an inter-cooler/pre-cooler will help cool the pressurized air, all blowers roots type, centrifugal or turbos all make a lot of heat, cooling the pressurized air charge, if you can, will help a ton... If your going to run gasoline even racing gases, an added methanol/water injection system for using under high boost pressures or even running strait methanol/alcohol for fuel will help with heat issues also, you will need to set up the fuel system properly for sure, too lean or too much heat will kill a blower motor pretty damn fast...

 

[Crizila]

Ya, gonna be buying a lot of -10 lines and fittings in the near future. Water injection is also on my list, as is an ignition retard system. Living in Az, I have to race in some pretty nasty temps at times. How well do MLS type head gaskets hold up? I'm already studed.

 

[HEMI-ITIS]

I'd like to mention this.The ATI has a 2.25 inch register hole for the crank pulley and the roots spacers & pullies use a 2 inch.I needed to open the spacer to 2.25 to fit the damper right:eusa_think: