This isn't really marine related but I thought some of you might be interested
in seeing what is possible with turbos. We dyno'd a twin turbo small block at
Tom Earharts over the weekend which turned out pretty well. The entire
motor, including hand built exhaust headers and intake plumbing, was built
by students at Pinckney High School, in Pinckney, MI.
The motor is a 357 cid Chevy with two 60mm turbos and a very mild
236/242@0.05" Cam, and 8.5:1 compression. We dyno'd the motor naturally
aspirated first, and then put the turbos on and dyno'd with boost. The
results were pretty astounding. 348HP naturally aspirated, 563 with 10psi
boost, and 931HP with 25psi. Given more tuning time and better
air(oil and exhaust leaks contaminated the intake air) it would have no doubt
made 1000 horse.
I've posted all three dyno sheets, and a couple of videos, one 770 raw ft-lb@3000rpm
and one at 830 raw ft-lb@5500 rpm. Make sure to watch the torque scale.
Thanks to Tom Earhart for all the dyno time, Bill Reifer(check300) for reading
gauges and donating some race fuel, and John at Pole Barn Engines for boring and
honing the block.
http://www.youtube.com/watch?v=fhOiWL4_qmc
http://www.youtube.com/watch?v=-dlSfSgWACE
in seeing what is possible with turbos. We dyno'd a twin turbo small block at
Tom Earharts over the weekend which turned out pretty well. The entire
motor, including hand built exhaust headers and intake plumbing, was built
by students at Pinckney High School, in Pinckney, MI.
The motor is a 357 cid Chevy with two 60mm turbos and a very mild
236/242@0.05" Cam, and 8.5:1 compression. We dyno'd the motor naturally
aspirated first, and then put the turbos on and dyno'd with boost. The
results were pretty astounding. 348HP naturally aspirated, 563 with 10psi
boost, and 931HP with 25psi. Given more tuning time and better
air(oil and exhaust leaks contaminated the intake air) it would have no doubt
made 1000 horse.
I've posted all three dyno sheets, and a couple of videos, one 770 raw ft-lb@3000rpm
and one at 830 raw ft-lb@5500 rpm. Make sure to watch the torque scale.
Thanks to Tom Earhart for all the dyno time, Bill Reifer(check300) for reading
gauges and donating some race fuel, and John at Pole Barn Engines for boring and
honing the block.
http://www.youtube.com/watch?v=fhOiWL4_qmc
http://www.youtube.com/watch?v=-dlSfSgWACE
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