Big Block Twin Turbo 7.0L Cadillac video 1

Ive built a custom big block twin turbo 7.0L Cadillac, with a blow thru carbureted system, and twin Intercoolers. I installed two T3/T04B on upside down headers, with twin 38mm waste gates. I have installed three RS Type BOVs and running the stock distributor with Proform 50k coil HEI ignition HOT upgrade, with 16 degrees initial and a check valve inline with the Vac advance. The Carb is a Holley 600cfm with mechanical secondaries, and nitrophyl floats. I set it up with a square delivery, and replaced the primaries with a Percys Adjust a Jet. I increased the PV restrictions by 135% area. On the tail Ive got twin OBDII Catalytic with Bosch single wire O2 sensors. The build is a 1935 Chevrolet.

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Big Block Twin Turbo 7.0L Cadillac video 2
The build is a 1935 Chevrolet. Ok, since the last video was taken, I've installed the painted cab, and completed most of the build. I designed the steering system around the original 1935 Chevrolet front end. You'll see the engine better, and hear it run. You can here the twin turbos whine, while I rev the 425. It was necessary to leave the original cam, so the power brakes would have plenty of vacuum. The engine pulls 21hg vacuum at 600 idle. The original transmission is a TH400, and Cadillac built them stout to take the 500ftlbs of stock torque. Most people don't know that these engines were capable of this much power, because the book numbers are with all accessories running, and a restrictive airflow. The turbos I installed are sized for a 3.5L engine, and will produce 25psi, while spooling right away. They will not reach the surge limit, because the rev limit of the engine is 5000 rpm. I am using stock dished pistons, because the original compression ratio was 8.5:1. When I checked the cylinder pressure while cranking, it came to 150psi in all cylinders. This computes to 10.2:1 compression under dynamics. The engine power estimates at 6psi Boost are 650hp and 680ftlbs. The limits of the engine are 16psi, and 1100hp. This is the calculated elastic limit of the stock rods, though the heat at 235 psi cylinder pressure before combustion, will melt the edges of the pistons and throw the internal balancing off. I will only be pressing the envelope to 8psi on 92 octane. More to come, and I'll post a video of the first road test.





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