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.
Big Block Twin Turbo Chevy II - Fresh Start Up
550ci Chevy with Precision Pro Mod 88's
first start up 460 turbo blow thru turbo sleeper maverick 91mm grabber 73 big block c6
this is the first time it has been started with the turbo it did good it is a totally stock 74 truck 460 only mods are ported exh. side of the heads and a .500 lift summit cam and arp rod bolts it has a 2 barrel on it just to start it , it will soon have a 800 holley , just to help some of you guys out the manifolds will not work upside down the ports are offset between the bolts i will have to make headers soon for it to perform