New mod>>>>kenne bell twin screw:)

[BRUTAL]

Well after my lackluster performance turning up the boost on the Stillen MP90 to 10psi(more heat, more power consumption) Ive been looking at alternatives. Namely a Kenne Bell or Whipple Twin Screw. Bell wont sell anything but kits, Whipple will sell individual TS, but still requires building alot of added pieces. My trip in May was uneventfull except a cut tire and alittle rear fender rock carnage, no biggy. 3 days back going to work and developed a knock on number 2. pull the engine. cool number 2 spun but crank ok. pulled all the pistons and WTF!!!seems number 4 ate a piece of the top compresssion ring. Piston damaged( still no biggy, 1 new piston from CP) and THEN crap grooved the cylinder wall at the top and thats going be a new set of pistons and overbore .020. Well being me, nows the time to go back together better. Ordered new pistons and dropped comp ratio another .5 to 8.5-1 and then looky here, someone selling JUST WHAT I was looking for in a used Corvette Kenne Bell Twin Screw 2.6l almost double the size of the MP90. so not only can I up the boost to 15psi,but I can slow down the blower and itll take less power to turn at boost and put out less heat than the Eaton win/win. Just won it and its on the way. Better intercooler under the SC. Now just to fab it all together and retune

[Mr. Tim]

What is the VE of the 2.6 @ 15psi? You might have to run more boost just to compensate for the parasitic loss to run that large of a displacement supercharger on that small of a motor.

Ought to be a fun project. Keep the updates coming.

[JNR]

That's 65% of the displacement of the engine, yikes! I know those screw compressors work really well on V8's like the LS and produce a good amount of power on those, so imagine as long as you can get the fuel and keep the intake temps down + tune for it, I bet you could get some good numbers out of it.

Have you thought about installing a water/meth injection to futher enhance the intercooling? Looks like that uses a water to air intercooler? Not sure where you could plumb in a nozzle(s) though on that setup, post compressor into the combustion chamber and it having enough heat to atomize the mist to steam...activating it is pretty simple using a hobbs switch and maybe set it at like 8 or 10 psi...I'm using a shurflo 100 psi diaphragm pump on my VR-4, but it also will be setup for 30 psig, so hence the high pressure...you could get a 60 psi pump pretty inexpensively and it'd be pretty straightforward for you to build up a 'kit' (don't pay the $$ for the overpriced kits, although some of them do have a neat controller); options are limitless on how fancy you want to make it.

Anyhow, sorry to hear about blowing your engine like that, but it's also a good excuse to put the new blower together.

What will you be doing with the stillen btw? Although I am a bit disappointed in the lackluster performance (compared to others).

[HKYStormFront]

epic! in for results!

[Hartnsol]

What will become of the nismo unit?

[BRUTAL]

YOULL HAVE TO GO TO KENNE BELLS SITE FOR VE, IVE BEEN LOOKING INTO IT FOR A COUPLE YRS AND BASED ON HIS INFO AND A FRIEND THAT BUILDS 2.6LH KITS FOR JAGUAR 4.2 MOTORS. THATS A GOOD SIZE FOR REALLY UPPING POWER. THE LH IS A BIGBORE HI COMPRESSION BLOWER WHICH I WAS GONNA USE BECAUSE IT COMPRESSES THE CHARGE 2-1 INSIDE THE BLOWER( A ROOTS/eATON IS NOT A COMPRESSOR . JUST PUSHES AIR) THE L MODEL COMPRESSES @1.5x'S. ITS BEST USED FOR 8-15PSI, THE H IS BEST AT 14-24PSI. ON THE JAGUAR 4.2 A KENNE BELL 2.6LH PUSHING 23PSI IS GOOD FOR 524RWHP ON A UNTUNED STOCK MOTOR. AND HIS HAS BEEN DOING THAT FOR 100K MILES. HE OFFERED TO SELL ME JUST THE TS, BUT THAT BY ITSELF WAS STILL ONLY A COUPLE HUNDERED CHEAPER THAT THE KIT I GOT WITH ALL THE EXTRAS.
I CAN DEAL WITH 15PSI SINCE I WAS ALREADY ALITTLE CONCERNED ABOUT OUR OPEN DECK BLOCK AND GASKET SEALING AT HIGHER BOOST.
JNR, ALREADY RUN A WATER METH INJECTION SYSTEM. ILL TEMP PROBE THE DISCHARGE THIS TIME AND MONITOR TEMPS. THE TWIN SCREWS ARE ALREADY KNOWN FOR ALOT LESS POWER DRAW THAN AN EATON AND ALOT LESS HEAT TOO, SO WE'LL SEE. IVE BEEN LOOKING AT A KILLER CHILLER BUT I HAVE A WINCH MOUNTED IN THE BUMPER IN THE COOLERS IDEAL MOUNTING LOCATION. IT TIES INTO THE AC DISCHARGE LINE FROM THE EVAP AND DROPS INTERCOOLER TEMPS APROX 60* WITH AC ON. IN HOUSTON THATS PRETTY MUCH YR ROUND
WITH 4.56 GEARS I DONT PLAN ON HAVING ISSUE WITH BUILDING BOOST AND I ALREADY TALKED TO KEN BELL ABOUT MY THOUGHTS AND THIERS. THEY SAID TOO I SHOULD HAVE ANY ISSUE WITH BOOST AND IT SHOULD BUILD VERY QUICKLY IN THE RPM RANGE AND RECOMMENDED A LARGER PULLEY BECAUSE OF THAT WHICH WILL TAKE EVEN LESS POWER TO TURN. ANOTHER ISSUE I NEED TO ADDRESS IS I WANT TO PROVIDE AN ABOSULE COLD AIR INTAKE SYSTEM INSTEAD OF THE K AND N WHICH IS NOT SEALED. i MAY GO BACK TO SOEMTHING FABBED WITH THE STOCK BOX HIDING A SETUP INSIDE DUCTED BACK INTO THE FENDERWELL. SHOULD BE FUN

Originally Posted by hartnsol

what will become of the nismo unit?

im still gonna use pieces from the stillen unit like fuel rails and the lower intake. The blower mount to the lower after cooler will be fabbed to mount the kb and a plate aftercooler. And ill have to ahem, modify the firewall alittle to clear the intercooler lines and air inlet which also may intail fabbing a rerouted ac line which is right behind the blower with a brake line.
The blower iteself i may put on ebay to offset costs

[JNR]

Well, not to split hairs, but the roots type supercharger is a compressor , since it brings in atmospheric pressure and forces (compresses) it into the combustion chambers via the internal lobes...But, it certainly isn't nearly as effecient as a screw compressor, that's for sure and I bet you'll be getting way better numbers and low/instant torque out of this new unit...

Do they require a ribbed belt (not v or serpentine, but cogged), btw, or do you think that would be a good upgrade? I don't mean like the 10-71 3" wide belts, lol, but a nice cogged pulley/ribbed belt setup would be nice. Although imagine the tensioners are good enough. I bring this up because I thought I read about people popping off belts on those, but they were also messing with the pulley od's too and who knows the condition of their tensioners, etc...Would just suck to burn thru a belt! Plus, it's give you even more of the whine (air trapped and squeezed out between belt/pulley), although the whipples do sound kind of cool on their own.

Anyhow, keep us posted and look forward to hearing about the final outome and how tractable it is...Will definitely take some modding to get it work, but least you already have bits/pieces from your other setup and don't have to look for a lower manifold, etc. I wanted one of those on my CTS-V real bad, but damn do they get $$$ (not that the others aren't).

Speaking of cooling, I was at a jobsite today where they use a thermal a/c setup and the guy was describing it to me...basically, it has this large pool of water that they add this particular silicone? type salt that freezes the water and they take that for their cooling...Hmm, I thought how cool it'd be on an automotive application...However, I bet it takes a fair amount of electricity to do that anyway and even if it did, imagine it takes some time, so you'd have a batch, but it would seem to come to a point that it would heat up to the point of needing more of that solution, so probably not feasible. Still, I'd like to look into what he was talking about, cause it sounded too good to be true, lol.

[BRUTAL]

no ill use the same belt setup. I didnt have belt slippage issue with the Eaton over a small pulley. itll be even better over3 3/4". I jjust want to use a off the shelf 7 rib. Im not gonna upgrade all the pulleys to 8 rib, but I will be useing a 8 rib blower pulley. Just one left withotu a belt and can always have them all fabbed later.
And I here ya on compressor/blower, BUt as Ive been corected before. A roots forces more air in. There is no compression except for the resistance to flow(boost psi). if it just blew out into the open, it would be a expensive fan. The Twin screws DO compress the air internally and discharge pressurized air. Another thing I never realized till I starting researching last yr was that the hi compression twin screw develops its 2to1 compession by actually having a smaller discharge port on the bottom than the L which has a 1.5 compression ratio. It achieves this because it has little more case length to compress the air. Theyre the same size, just one has a smaller exit...learn something new all the time.
The twin screw efficiency and comression is one reason I remember NHRA outlawed them yrs ago on Top Fuel over the traditional roots. They just made way more power. not that thats hard for a top fueler to do. Just getting 8000hp to hook up down the track.
IM pretty excited to get started. Im still waiting for the new pistons from CP. Theyre alredy in production. I need the block and crank back from the machine shop. And rings from Total Seal since Im gonna go gapless with rings this time. Ive used them on the 383 and the 580 in the El Camino, and have always gotten low leakdown rates.
I may go over to Engine Logic since they have a blown 4.0 out of Sexterra's blown Xterra he torched a few yrs ago. then I can start the mockup of the blower to lower base and work on belt size and routing

[JNR]

yeah, I guess technically that would be correct then and sort of like when people spec blowers vs. fans in an industrial air system, so that makes sense. Guess since it is on the engine functioning it could be considered a compressor, but on its own, just an air pusher...so in essence, a screw supercharger is a little more related to a centrifugal in the sense that the pressure increases on the outlet side whether or not there is resistance on that end. Of course that's about where the similarities end, he he.

Ought to be a cool project and wish I were able to dwell into those areas on this truck, but funds/time just no go...never know though what the future holds and the truck sure could use some boost , as the n/a limits seem to get reached pretty quickly (realistically speaking)...not really interested in a turbo on this truck, so that leaves the supercharger...the stillen was not really that impressive IMO as far as power goes, so it'd be neat to see other options. A man can dream if nothing else, lol.

Sounds like a fun project and should make for quite the beast!

[sudingusnavy]

I cant wait to see this! You got to take it to the strip and get an 1/8 mile time when your done!