Roots/Twin screw heat soak?

[Jr]

Simple. Real world experience. Mark runs a LS9 blower on his 427. A few years ago, a guy with a 99 magnacharged vette was ripping off impressive times at Optima. Everyone says twin screws are more efficient, but ....yeah never know. Again, looking for real world experience.

[6carmello8]

Originally Posted by Jr

Simple. Real world experience. Mark runs a LS9 blower on his 427. A few years ago, a guy with a 99 magnacharged vette was ripping off impressive times at Optima. Everyone says twin screws are more efficient, but ....yeah never know. Again, looking for real world experience.

Fair enough fair enough !

[Bowtieracing]

Good points but it is a big chunk of aluminium on the top of the engine. Keeping under hood temp as low as possible is something to keep in mind.

[Ron in SoCal]

Heat soak happens, IMHO, on any blower motor. I agree w Carmello above that twin screws are more efficient. KB advertises a 10 degree intake charge increase with their intercooler system, but you can always go bigger and less efficient and engineer more cooling into the system.

Temps and humidity on the specific day, how long your track sessions last (Optima at Spring Mountain is what, four laps / 2.5 miles a lap?) all factor into the equation.

What's the intended use?

[Jr]

Originally Posted by Ron in SoCal

Heat soak happens, IMHO, on any blower motor. I agree w Carmello above that twin screws are more efficient. KB advertises a 10 degree intake charge increase with their intercooler system, but you can always go bigger and less efficient and engineer more cooling into the system.

Temps and humidity on the specific day, how long your track sessions last (Optima at Spring Mountain is what, four laps / 2.5 miles a lap?) all factor into the equation.

What's the intended use?

The intended use would be street driving, good guys, and USCA events. I would also like to do random speed venture outings at Fontana.

[6carmello8]

Originally Posted by Jr

The intended use would be street driving, good guys, and USCA events. I would also like to do random speed venture outings at Fontana.

With the type of power you'd be making with a PD blower, I wouldn't worry too much about heat soak. You're going to be making so much power under the curve that it'll more than make up for loss of power under heat soak. AND if the heat soak is something you are irritated of for lack of a better word, you can run water/meth injection. I think you should go ahead and get the blower if you're thinking about it. I doubt you'd be disappointed with the overall result regardless of the heat soak issue.

[71RS/SS396]

How quickly it heat soaks has a lot to due with how much water is being flowed through the intercooler and how hard you're spinning the blower. We've been testing this on a dyno and have found some blowers will heat soak in 3 pulls on the dyno because the intercoolers are so restrictive to water flow. I can tell you a 4.0L whipple intercooler can be modified to flow 20 gpm.