So.. if I went kenne bell, how MUCH HP can I get with 10:1 compression?

Car Nut said:

Isn't the KB charger supposed to create less heat than other superchargers?

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i think your wrong on this. maybe less heat then a roots type but i dont think a supercharger sitting right ontop of the block with instantanous boost is going to run cooler then a setup with a centrifugal which to my knowledge are more efficient provided by the bigger hp gains people see with them

Thanks Grady!! At my age I sometimes forget how to get home....

Actually, running a KB with a high compression motor may not be a horrid idea. Look at it this way, what makes power is airflow, boost is just a number, a measure of pressure at the intake valve - with a 10:1 motor you already have good airflow and are getting closer to 100% volumetric efficiency than a stock CR motor. Now with ANY blower you will have to run less boost with higher CR, but that's not necessarily a bad thing in your case. With less boost you'll create less heat - the aircharge temps will be far lower at 4-6# of boost than they would be at >8#. And without any IC available for 5.0 KBs that's a really good thing. You just have to be really careful, get a good tune and not get carried away with it.

Here's a good example. The '07 GTs have a CR of 9.8:1 - so the blowers for most of the 3v motors start out at lower boost. We tuned an '06 GT last year with a Saleen twin screw at only 4# of boost and it made 397 RWHP. Your results may vary because the 3v is a pretty darn efficient motor.

Hope this helps!

Don

how about a turbo with an intercooler......?

the only kit available w/ an intercooler i know of is the paxton. i think you could fab a custom setup for other blowers but it would take a good amount of work. kb's do NOT run cooler

igotyofire said:

i think your wrong on this. maybe less heat then a roots type but i dont think a supercharger sitting right ontop of the block with instantanous boost is going to run cooler then a setup with a centrifugal which to my knowledge are more efficient provided by the bigger hp gains people see with them

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Actually, he's correct although I don't think it's as much as 80%. IIRC, it more along the lines of 30 - 35% cooler. Efficiency is measured in number of different ways when referring to power adders. Centrifugals tend to be more HP efficient at the top of its range. Thermal efficiency however, is a different story. Twin screws are very thermally efficient within their designed spin and boost range. Much more efficient than centrifugals.

A twin screw makes its largest amount of heat at idle when the by-passed air is being routed back into the blower inlet. When actually providing boost to the motor (by-pass closed), they are VERY efficient and run considerably cooler than a centri does on the same combo making similar power.

BTW: ATI centri kits have air to air aftercoolers and Vortec has an air to water you cooler that you can order and install additionally.

I think the point that Don was trying to make is that at the pressure (boost level) that would be recommended by this engine combo and the KB (2-4 psi) the KB would generate almost NO increase in air charge temps. Compressing air is what generates heat, not (to any degree) the unit compressing it. With only 2-4 psi, the air would not be compressed enough to generate a bunch of heat. My question would be whether or not the gain would be enough to warrant the expense/effort.

As far as the "cost" and "availability" of methanol for injection, consider that windsheild washer fluid has an almost perfect ratio of alcohol (methanol) and water to be used as a "charge cooler" for a boosted application. $1.29 a gallon at almost ANY gas station.

Correct.

When I said no IC, I meant Kenne Bell blowers. Any centrifugal can be set up with one of you can weld pipes.

Be careful with washer fluid - especially in winter, some contain glycol which will will not be good. Check the ingredients.

There is this little company that provide intercooled superchargers for 5.0s. There called ATI Pro-Charger maybe you have heard of them? Half their kits come with 2 cores some come with three cores. Heres the link http://www.procharger.com/FORD/ford_auto.shtml

Personal I have no idea why these superchargers are constantly overlooked by the stang community.