SDPC 402 Engine Dyno Results
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From: Round Rock, TX
SDPC 402 Engine Dyno Results We have started testing some different 402 combinations. Here is a brief description of the results so far:
SDPC 402 using GM Performance Parts LS2 block (Part # 12568950), Callies 4" crank, JE flat top pistons (~11.5:1 CR)
Using GM LS6 CNC Heads (Part # 88958665), a stock LS6 intake, a BBK 80mm TB, and an SDPC Z+ cam - 220/224 @ 0.050 0.551/0.551 lift on a 114 (with 1.7 rockers *** NOTE we were using some custom 1.75 roller rockers, so the lift was actually .567/.567)
With this small cam, HP = 537 @ 5400 and TQ = 564 @ 4600 (almost 500ft/lbs from 3000-6000)
On this setup, we were running a custom vacuum pump. The pump pulled a solid 8-10inHg during the run, and it probably contributed 8-10hp. Unfortunately, the pump broke while tuning our next setup. We expect to have it back in operation for our next round of testing.
We then installed a larger cam, BigStick240 - 240/246 @ .050 .600.600 lift on a 112 (with 1.7 rockers; we were using 1.75 rockers, so our lift was .618/.618).
With this medium cam, HP = 599 @ 6300 and TQ = 572 @ 4800
We then installed a FAST 90 and used a SDPC 90mm TB.
With the FAST 90, HP = 619 @ 6200 and TQ = 582 @ 4800
We have more head/cam combinations to try.
For pics, vids, and more detail, see here.
SDPC 402 using GM Performance Parts LS2 block (Part # 12568950), Callies 4" crank, JE flat top pistons (~11.5:1 CR)
Using GM LS6 CNC Heads (Part # 88958665), a stock LS6 intake, a BBK 80mm TB, and an SDPC Z+ cam - 220/224 @ 0.050 0.551/0.551 lift on a 114 (with 1.7 rockers *** NOTE we were using some custom 1.75 roller rockers, so the lift was actually .567/.567)
With this small cam, HP = 537 @ 5400 and TQ = 564 @ 4600 (almost 500ft/lbs from 3000-6000)
On this setup, we were running a custom vacuum pump. The pump pulled a solid 8-10inHg during the run, and it probably contributed 8-10hp. Unfortunately, the pump broke while tuning our next setup. We expect to have it back in operation for our next round of testing.
We then installed a larger cam, BigStick240 - 240/246 @ .050 .600.600 lift on a 112 (with 1.7 rockers; we were using 1.75 rockers, so our lift was .618/.618).
With this medium cam, HP = 599 @ 6300 and TQ = 572 @ 4800
We then installed a FAST 90 and used a SDPC 90mm TB.
With the FAST 90, HP = 619 @ 6200 and TQ = 582 @ 4800
We have more head/cam combinations to try.
For pics, vids, and more detail, see here.
