Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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MGBV8
Carl Floyd
Kingsport, TN
(3232 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
GM LFX V6
Posted by: MGBV8
Date: June 22, 2017 01:14PM

Looks like a great choice IF it will fit.

Use the engine from a 2012-2014 Camaro for 323 hp @ 6800 & 278 lb.-ft. @ 4800. Use the 6 speed from a Caddy CTS for better gear spacing. Want IRS use the one from a 2006-2008 CTS.

[gmauthority.com]

Miata LFX race car build using the above parts.

[www.mazdatalkforum.com]


BWA


(302 posts)

Registered:
04/13/2010 08:13PM

Main British Car:


Re: GM LFX V6
Posted by: BWA
Date: June 22, 2017 03:24PM

It looks kind of tall for fitting under the hood of most lbc's
I think one would have to go with a dry sump set up to get it low enough.
Looks like a good engine.

Cheers
Byron


MG four six eight
Bill Jacobson
Wa state
(274 posts)

Registered:
10/23/2007 02:15AM

Main British Car:
73 MGB Buick 215, Eaton/GM supercharger

Re: GM LFX V6
Posted by: MG four six eight
Date: June 22, 2017 08:49PM

Carl,

They are fairly tall and wide, so I'm not sure if it will fit a B. Probably could be done though with enough time and fabrication skills and it would look pretty cool as well!
It's a good engine and will push a Camaro along pretty good, although nothing like a ZL1 ;-)

The engine is the latest generation of the "high feature" V6's found in the Traverse, Colorado and other GM vehicles. Since it's direct injected and has variable valve timing it pretty much will require the factory ECM.
Additionally the low pressure fuel pump is pulse width controlled to vary the low pressure side fuel pressure, which requires module control as well.

The earlier engines (pre 2010) could prematurely wear out the timing chains, especially if the oil/filter were not changed regularly. GM updated the timing chains for those engines and once we replaced them they were good to go for many miles after that.

Bill


joe_padavano
Joseph Padavano
Northern Virginia
(112 posts)

Registered:
02/15/2010 03:49PM

Main British Car:
1962 F-85 Deluxe wagon 215 Olds

Re: GM LFX V6
Posted by: joe_padavano
Date: June 25, 2017 09:07AM

The problem with DOHC motors is the height and width. This is one reason why the Corvette has retained the pushrod motor. It is far more compact for the same HP and torque. This photo compares a 5.0 small block Ford and 4.6 Mod Motor as an example.
DOHC vs OHV.jpg


MGBV8
Carl Floyd
Kingsport, TN
(3232 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: GM LFX V6
Posted by: MGBV8
Date: June 26, 2017 11:08AM

Even the block looks bigger in that pic, Joe.


joe_padavano
Joseph Padavano
Northern Virginia
(112 posts)

Registered:
02/15/2010 03:49PM

Main British Car:
1962 F-85 Deluxe wagon 215 Olds

Re: GM LFX V6
Posted by: joe_padavano
Date: June 27, 2017 09:16AM

"Even the block looks bigger in that pic, Joe."

Yeah, it does. I don't know how much of that is the angle of the photo, and how much is real. The deck surface of the DOHC block needs to be substantially wider to accommodate the much wider head, for example. The front of the block also has to provide volume for the cam drive chains.


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