[Diy_efi] Vortec 4200 Inline 6 ECM - Twin Turbo -

[Brien Tourville]

Subject:     Vortec 4200 Inline 6 ECM - Twin Turbo -
To:             	<hh7x at verizon.net>,	
Copies to:      	<diy_efi at diy-efi.org>


They would probably add 20 horsepower if the inlet to the bottom 
turbo
weren't ingesting hot air from the top tubo's exhaust headers. dh


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Check the Motor Trend Issue on the GM Vortec 4200 TwinTurbo Truck 
and you'll see they moved the forward Turbo Upward and almost over
the lower Turbo.  

The Positioning of the rear Turbo was what I was after as  the one in 
the Motor Trend Article of GMs only shows the forward Aerodyne.

Guess is, my .jpg came first as a Studio Mock-Up Concept and then
GM greenlighted a real Installation application.

I agree > that rear Turbo ingesting broiling hot air off the leading 
Turbo housing > ain't.


----- Original Message ----- 
From: "Brien Tourville" <hh7x at verizon.net>
To: "jb" <jonnbell at gmail.com>
Cc: <diy_efi at diy-efi.org>
Sent: Friday, August 19, 2005 8:00 PM
Subject: [Diy_efi] Vortec 4200 Inline 6 ECM - Twin Turbo -


> "Of course, if we needed more, there's more to be had," adds a
> smiling, but equally dry Kociba. "The point was to demonstrate the
> bullet-proof nature of this engine with fairly minor 
modifications."
>
> We were surprised to learn how little is changed to create this
> Bullitt Mustang-performance-equaling six, with its twin Aerodyne
> turbos and air-to-water intercooler. For example, the block, crank,
> head, head gasket, cams, and valve sizes remain virtually 
untouched.
> The extra breathing hardware adds but 45 lb to the engine's mass.
> The only critical mods were a switch to 8.5:1 pistons (from 
10.1:1),
> the addition of piston-cooling oil squirters, shorter (by 2 mm)
> connecting rods, thicker piston pins, higher-flow oil pump and fuel
> injectors, and a freer-flowing exhaust system. As you'd expect, the
> 4L60-E four-speed transmission's internals required some beefing,
> and the transfer case was swapped for the ultra-tough
> all-wheel-drive unit found in the 6.0L V-8-powered Cadillac
> Escalade.
>
> Home office for the 4.2L/270-hp Vortec six is the GMT360 platform
> (Chevrolet TrailBlazer, GMC Envoy, Olds Bravada). So it was logical
> to install this experimental version in one of those platform
> variants. The Chevy was chosen primarily because of its mechanical
> relationship with the hot Chevrolet (GMT368) SSR retro pickup and
> the long-wheelbase Chevrolet TrailBlazer XL (GMT370) with the
> third-row seat, both of which will debut soon. Besides, Chevy is 
the
> most performance oriented of these three brands.
>
>
>
>              Brien.
>          NEW YORK
>    eagle registry #501
> eagle kammback registry





             Brien.
         NEW YORK
   eagle registry #501
eagle kammback registry