Dual throttle body LT1 intake
Registered User
Joined: Jul 2000
Posts: 520
From: MD
The plugs show a big difference in color from front to back, we
considered limiting fuel to the rear injectors but decided to try
to add air to the rear of the intake instead.
Our thinking may be flawed, correct me if you see things differently.
The objectives were to increase plenum size, improve air distribution
and increase intake plenum pressure. All of this should be accomplished
but that does not necessarily mean improved performance.
considered limiting fuel to the rear injectors but decided to try
to add air to the rear of the intake instead.
Our thinking may be flawed, correct me if you see things differently.
The objectives were to increase plenum size, improve air distribution
and increase intake plenum pressure. All of this should be accomplished
but that does not necessarily mean improved performance.
Thread Starter
Registered User
Joined: Oct 2006
Posts: 172
Mark,
I'll ask again about the back cylinders running rich, I;m sure that's
what I was told but maybe he was mistaken.
The combination is a flat top 383 CI LT1 4.030" stroke, 3.750" stroke
Stock heads ported, at first just a basic clean up with out making major
changes to the port size, later I raised the port roof 1/8", it didn't
improve performance much. Chambers are worked to unshroud the
valves and one groove cut in each squish pad.
The cam is a solid roller from Bullet, I'll check on the specks,
~ 270 degrees @ 0.050" ~ 0.630" lift.
T350 with 4.30 gears in the rear end, 9 X 30" radial slicks.
The Car has been 9.90s in good air, 10.20s in the heat. 60 ft times in
the high 1.29s to low 1.30s. Lacks power on the top end. Theres more
to be found I'm sure.
I'll ask again about the back cylinders running rich, I;m sure that's
what I was told but maybe he was mistaken.
The combination is a flat top 383 CI LT1 4.030" stroke, 3.750" stroke
Stock heads ported, at first just a basic clean up with out making major
changes to the port size, later I raised the port roof 1/8", it didn't
improve performance much. Chambers are worked to unshroud the
valves and one groove cut in each squish pad.
The cam is a solid roller from Bullet, I'll check on the specks,
~ 270 degrees @ 0.050" ~ 0.630" lift.
T350 with 4.30 gears in the rear end, 9 X 30" radial slicks.
The Car has been 9.90s in good air, 10.20s in the heat. 60 ft times in
the high 1.29s to low 1.30s. Lacks power on the top end. Theres more
to be found I'm sure.
Registered User
Joined: Oct 2004
Posts: 1,130
From: las vegas
for sure we lost #8 literally pulled the head off and only saw 3 pistons #8 was a hole with a rod and wrist-pin lookin at us.stock Lt1, longtubes, madz tune,3.73s,nittos, 52mm,k&n cai,150 shot 11.33 @118 1.6 60',then 175 shot 1.54 60' KAAABOOM white smoke,coolant,piston material on the track, OOOPS!
West South Central Moderator
Joined: Oct 2000
Posts: 3,371
From: Kilgore TX 75662
I was thinking that it'd be interesting to move 2 TBs to the top of the plenum facing up. They would have to be inline, but that could look cool and possibly perform very well if you could set up the linkage and everything.
How would you do the linkage in your dual TB intake? Hook them so they both open at the same rate and everything, or make them progressive?
How would you do the linkage in your dual TB intake? Hook them so they both open at the same rate and everything, or make them progressive?
http://www.impalassforum.com/vBullet...d.php?t=213529
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