old motorhead

iTrader: (10)

What happens when you spin the snot out of an MP122? Not talking about big boost. Boost should be around 8 to 9psi. Previous setup had LQ4 with LS6 cam, high lift rocker arms, and LT's with 3" duals. Boost was about 9psi with 2.8" snout pulley.

New setup is HKE forged 6.0L with Livernois stage II heads and 215/227 .603/.613 116lsa Comp Cam using LSL lobes. I'm thinking that a 2.6" pulley should have similar boost. I know I'm probably out of blower, but haven't been able to find a TVS2300 at a reasonable price. Will the MP122 play nice with this setup?

Blown06

iTrader: (32)

I see alot of heat in your future.

OnyxSilveradoSS

iTrader: (4)

get a spacer from ray.
maybe see if trick could fit a larger IC core in the tub

old motorhead

iTrader: (10)

If boost remains the same (could possibly be less), is it a "given" that there will be more heat?

DrX

iTrader: (7)

My understanding is that if boost is held constant, Delta T will increase somewhat as you move away from the blower's sweet spot RPM - either up or down. But boost level has a much greater effect on Delta T. Check out all the TVS graphs in Magnuson's online catalogue- download the .pdf and go to page 37 for Delta T.

DrX

iTrader: (7)

Here's the graph. Not concerned about the numbers TVS vs 122, this is just to demonstrate the trends.

Atomic

iTrader: (42)

Assuming you are using the stock truck 7.527" crank pulley and a 6000rpm redline, the max blower speed will be around 17,400 rpm. I dont have any graphs for the isentropic efficiency for the mp122, but its basically the opposite of the delta temperature chart, ie, the more isentropicly effecient, the more of the input work is converted to blower work and not lost as heat. The TVS1900 falls below 60% at 18k rpm.

If you look at driver power, which is basically input work, and keep in mind the isentropic efficiency you can figure out how big of a heater you have . For example, at 18k rpm and 9psi, the tvs1900 is around 60hp.
60*746*(1-.6)=~18kw

old motorhead

iTrader: (10)

OK....how 'bout dumbing it down a little? (you're dealing with a seriously low tech redneck here). I'm expecting the ported heads and bigger cam to lower boost considerably. If you spin the MP122 faster, and boost remains the same, will IAT's be the same or similar? I have a Snow boost cooler connected to WW fluid tank. Previous LQ4 was amazingly consistant. At the track, it would run mid 12 sec quarters in warm to hot weather all night long. New set up has similar compression ratio if that matters.

DrX

iTrader: (7)

Can you put a 2.6 pulley on a 122? If you can, I don't think you will see much difference in IATs compared to a 2.8 on your old setup.

Atomic

iTrader: (42)

I believe the temperature is more dependant on boost pressure than rotor speed