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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Engine Tunes/Mods

Engine Tunes/Mods Performance Engine Tuning/Engine Modifications

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  #1  
Old 11-10-2007, 01:50 AM
efi-diy efi-diy is offline
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1951 GMC 3100 PU Truck
hot rod black turbo'ed 4.2L I6 2WD
Join Date: Sep 2006
Location: Alberta, Canada
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4200 engine swaps + hot rod parts

The 4200 enigne has a lot of potential for engine swaps and some folks like myself are starting to do them.


Well I don't have a trailblazer but I do have a 4200 in a '51 GMC running NO GM electronics ( megasquirt and FORD EDIS wasted spark). This winter its getting a GT42 turbo along with a stout bottom end (pistons, rods, darton sleves) and custom cam shafts. <<< doing the design for the CNC cam blanks this weekend.

Once we have the cam blanks ($500) then we'll send them to a cam grinder to get them ground into cams (another $700). The prototype turbo manifold is getting done at www.steedspeed.com. The CNC intake flange is enroute to start the build.

pix of the swap are here http://profile.imageshack.us/user/efi_diy/

Stay tuned parts are in the pipe.
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  #2  
Old 11-10-2007, 01:53 AM
trailblazingold's Avatar
trailblazingold trailblazingold is offline
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2006 Chevy TrailBlazer LS
Singularity Silver 4.2L I6 2WD
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Its good to see someone likes our motor. I'm looking forward to the finished product already.
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  #3  
Old 11-10-2007, 02:11 AM
efi-diy efi-diy is offline
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1951 GMC 3100 PU Truck
hot rod black turbo'ed 4.2L I6 2WD
Join Date: Sep 2006
Location: Alberta, Canada
Posts: 823
Parts needed

What I'm having a hard time to find is a 2006 head.. anyone have any sources without buying a complete engine?
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  #4  
Old 11-10-2007, 10:27 AM
pvgoheelsunc1 pvgoheelsunc1 is offline
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2003 Chevy TrailBlazer LT
Summit White 4.2L I6 2WD
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http://car-part.com/ ....click on link enter zip or state or area of USA, this might help
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  #5  
Old 11-10-2007, 02:55 PM
blazinlow89 blazinlow89 is offline
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2004 Chevy TrailBlazer LS
Indigo Blue Metallic 4.2L I6 4X4
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I see heads and blocks on ebay all the time.

Im interested in this, before i even bought the TB i was thinking of boosting it, mainly a SC. But the more i look at it a turbo might be pretty good. Looking good so far

Ive been looking for an engine for my s-10 blazer and this will put out pretty close to a carb SBC. Not the mention the 4200 is lighter than a 350, and it would mate to my 700r4 with no problems. I want to see some more info on your fuel and ignition setup as i dont want to run the electronics.n
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  #6  
Old 11-11-2007, 12:51 PM
efi-diy efi-diy is offline
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1951 GMC 3100 PU Truck
hot rod black turbo'ed 4.2L I6 2WD
Join Date: Sep 2006
Location: Alberta, Canada
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Quote:
Originally Posted by blazinlow89 View Post
. I want to see some more info on your fuel and ignition setup as i dont want to run the electronics.n

Well the 4200 does not have a dist. so you will need to run electronics for spark control. You could build a custom intake and run carbs - but why? It a lot less work to hookup a megasquirt than fabricate an intake. But thats just my take on things. If you do decide to go with a megasquirt I can send you the calibration file so the tuning will be real close.
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  #7  
Old 12-01-2007, 04:19 PM
efi-diy efi-diy is offline
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1951 GMC 3100 PU Truck
hot rod black turbo'ed 4.2L I6 2WD
Join Date: Sep 2006
Location: Alberta, Canada
Posts: 823
Cam cores

Well the cam cores are designed and ready to goto the machine shop. We're getting them cut from 8620 round bar. GM does not sell cam cores for this engine and the aftermarket doesn't have them either - so the only way to get non-stock cams for this engine is to design and machine cam cores then send them to a cam grinder.

exhaust core
http://img213.imageshack.us/my.php?i...camcoreld0.jpg

intake core

http://img215.imageshack.us/my.php?i...camcoreix0.jpg

The next step is to settle on a cam grinder, currently Comp Cams will do the job.
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  #8  
Old 12-03-2007, 04:35 AM
ScarabEpic22 ScarabEpic22 is offline
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MEGASQUIRT huh?? Buddy of mine has been running that in his VW Scirocco and Rabbit for a year or so now. Swears by it, and hes NA.

Glad to see someone who uses this engine in a hot rod is actually posting up here for us! Good luck with the build, and if you have questions about the engine feel free to ask anyone (or me)!

What have you done with the exhaust cam VVT, nothing or have you swapped the cam already?
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  #9  
Old 12-04-2007, 12:58 AM
efi-diy efi-diy is offline
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1951 GMC 3100 PU Truck
hot rod black turbo'ed 4.2L I6 2WD
Join Date: Sep 2006
Location: Alberta, Canada
Posts: 823
Trav4011 ??????????????

Any idea where I can get hold of this guy? I'd like to talk to him
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  #10  
Old 12-04-2007, 01:00 AM
efi-diy efi-diy is offline
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1951 GMC 3100 PU Truck
hot rod black turbo'ed 4.2L I6 2WD
Join Date: Sep 2006
Location: Alberta, Canada
Posts: 823
Quote:
Originally Posted by ScarabEpic22 View Post
MEGASQUIRT huh?? Buddy of mine has been running that in his VW Scirocco and Rabbit for a year or so now. Swears by it, and hes NA.

Glad to see someone who uses this engine in a hot rod is actually posting up here for us! Good luck with the build, and if you have questions about the engine feel free to ask anyone (or me)!

What have you done with the exhaust cam VVT, nothing or have you swapped the cam already?
The VVT is disconnected for now. I need to get some s/w written to do the control and read the position sensor then I'll try and control it.
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