7.4L Big TB
Thread Starter
Racer
Joined: Apr 2006
Posts: 373
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From: Chipley Florida
7.4L Big TB
Here is a project that Steve Simpson and I have been working on . A mounted 7.4L Big TB with 90LB injectors mounted on a crossfire lid with a ported manifold.....
http://www.thecubestudio.com/picture...UpFrontWEB.jpg
http://www.thecubestudio.com/picture...UpFrontWEB.jpg
Tech Contributor
Joined: Jun 2004
Posts: 20,869
Likes: 961
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Looking good. Your TB placement has to be an improvement (mixture-wise) compared to the stock CF system. (I'm using the same TB on my turbo '84, but with a conventional manifold.) Keep us updated with photos. 
Thread Starter
Racer
Joined: Apr 2006
Posts: 373
Likes: 0
From: Chipley Florida
7.4L Big TB
Note in this picture that the throttle bores straddle the stock EGR channel in the middle of the plenum. So BIG TB can be used with a stock manifold, although currently I am having a crossfire ported to go under my BIG TB and new lid to better take advatage of the increased flow. The entire EGR will be removed as part of the porting process."
http://www.thecubestudio.com/picture...trusionWEB.jpg
Last edited by warrior2291; May 2, 2008 at 05:29 PM. Reason: more information to add
Tech Contributor
Joined: Jun 2004
Posts: 20,869
Likes: 961
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
TB is placed so that distance is as equal as possible to each runner and places the TB directly over the deep valley that runs diagonally across the middle of the manifold between the runners. I think that's a wise move. Given that the injectors fire alternately, but the cylinder banks don't always, your system should have better distribution than the stock TB's sitting atop opposite banks.
Note in this picture that the throttle bores straddle the stock EGR channel in the middle of the plenum. So BIG TB can be used with a stock manifold, although currently I am having a crossfire ported to go under my BIG TB and new lid to better take advatage of the increased flow. The entire EGR will be removed as part of the porting process."
http://www.thecubestudio.com/picture...trusionWEB.jpg
Note in this picture that the throttle bores straddle the stock EGR channel in the middle of the plenum. So BIG TB can be used with a stock manifold, although currently I am having a crossfire ported to go under my BIG TB and new lid to better take advatage of the increased flow. The entire EGR will be removed as part of the porting process."
http://www.thecubestudio.com/picture...trusionWEB.jpg
Thread Starter
Racer
Joined: Apr 2006
Posts: 373
Likes: 0
From: Chipley Florida
7.4L Big TB on a CFI
Here is another picture of the 7.4L on a crossfire LID just about done need to polish and port intake........
http://www.thecubestudio.com/picture...kUpSideWEB.jpg
http://www.thecubestudio.com/picture...kUpSideWEB.jpg
