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Engine pr0n (G rated)

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Originally posted by: Saga
So, by your explanation, the whipple is better than the Eaton mass-produced twisted roots?
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Much better. A twin screw can almost be compared to a centrifugal blower or turbo in efficiency, compared to a roots.

On a 03 Cobra, a simple swap from the roots blower to a twin screw blower is about a 75-100 HP gain at the same boost level without changing anything else (less heat, denser cooler air, less parasitic drive loss because the blower doesn't have to spin as fast to make the same boost, etc)
 
At the risk of further de-railing this thread, I've been eyeballing various semi-bolt on products to add to a LQ9. A gearhead friend of mine (I do more electronics and am, for all intents and purposes, a greasemonkey in training) has been attempting to steer me towards a Vortec SC for some time, but I honestly prefer the Whipple for various reasons - it's self contained so I don't have to punch a hole in my oil pan, and it uses a far more thermodynamically efficient design.

What would you recommend if I intended to stay at $8000 or below total parts, if say I wanted to do a SC/TwinTurbo monstrosity?

Feel free to PM if you want/need.

Edit: The reason I like the Whipple is it appears to gain the highest HP gains at far lower RPM's than the Vortec does, and when dealing with the 6,000RPM redline LQ9 I assumed that made the most sense. Feel free to educate me otherwise, though, as I'm mostly speculating based on limited understanding.
 
Shit. Now I'm doubly confused. Doing a bit of research shows that the 06 and before Vmax (or VHO for you oldies) was the LQ9. 07 and beyond (which mine falls into) is showing the L76. Are those both Vmaxes?
 
Originally posted by: Saga
Shit. Now I'm doubly confused. Doing a bit of research shows that the 06 and before Vmax (or VHO for you oldies) was the LQ9. 07 and beyond (which mine falls into) is showing the L76. Are those both Vmaxes?
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I attempted to use my mind reading devices but they failed.


What vehicle?
 
Originally posted by: Deviant Grasshopper
Originally posted by: Saga
Shit. Now I'm doubly confused. Doing a bit of research shows that the 06 and before Vmax (or VHO for you oldies) was the LQ9. 07 and beyond (which mine falls into) is showing the L76. Are those both Vmaxes?
Click to expand...

I attempted to use my mind reading devices but they failed.


What vehicle?
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You old people don't have them pre-installed? I thought that was the point. 😉

'07 SLT Sierra K1500 6.0 VortecMax.
 
Originally posted by: Saga
Originally posted by: Howard
Originally posted by: Saga
Huh. I didn't know the LS9 used a twinscrew turbo as opposed to a rotary.
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wat's a twinscrew turbo?
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Originally posted by: mwmorph
Originally posted by: Saga
Huh. I didn't know the LS9 used a twinscrew turbo as opposed to a rotary.
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It's a positive displacement (roots type) supercharger. The marketing material will deny it, but it is very much a modified roots type with 4 lobes as opposed the conventional two which should give it higher efficiency since Roots type have never been known for their efficiency at anymore than lowish psi.
The most legendary engine of all time: The Porsche Aircooled Flat 6
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I'm probably wrong, it just looks an awful lot like a Whipple supercharger when everything is taken apart.
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LOL

What I meant was that there's no such thing as a twin-screw turbo (at least, to my knowledge).
 
Originally posted by: Howard
What I meant was that there's no such thing as a twin-screw turbo (at least, to my knowledge).
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Someone is thinking of 'Twin Scroll' turbos:

Twin scroll turbine housing. The TST housing derives its name from the geometry of the exhaust gas inlet into the turbine. Two different-sized scrolls are generally used, a primary and a secondary. Typically, the primary is open for low-speed operation, and both for high-speed use. This creates the ability of the TST to be a small A/R housing at low speeds and a large A/R at higher speeds. TST designs are of merit in that they offer a better combination of low-speed response and high-end power. It would be difficult to configure the unit to control boost by effectively varying A/R. A wastegate is therefore still necessary to control boost pressure. Simplicity of the twin scroll turbine housing is its big selling point.
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No complete tear down shots, just some of the internals.

In Ford dyno testing, the "Cammer" made 616 hp at 7000 rpm and 515 lbs/ft of torque at 3800 rpm, the most power any production/race engine had ever made, then or now.
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Link

I would love to own one of these, granted I would need an insurance policy to cover any damage my lead foot may cause to the engine.
 
A long time ago, probably 20 years or more I went to the SAC museum in Omaha. The whole thing was pretty damn amazing, but one thing that really stood out in my mind was a V-12 engine on display. If memory serves my correctly, it was from a P-51 Mustang. Talk about gear head porn, this thing was/is a piece of art. Seriously, put this in your living room!
http://www.williammaloney.com/...0V12AircraftEngine.htm
Amazingly complex and modern for it's time. I'm pretty sure this is a different motor than what I saw, but still.
http://upload.wikimedia.org/wi...12_Aircraft_engine.jpg
Freakin' works of art, in my opinion. Sorry these are not automotive engines, but I love this shit.
 
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