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tpepmeie · 02-12-2018

427 LT5 build 1 observations

1/19/2011: SF901 Engine Dyno, 300 rpm/sec, SAE1349 correction - 669 bhp [703 using STP correction]
8/9/2012: Dynojet shop "A", SAE1349 correction - 637.2 rwhp
5/10/2013: Dynojet shop "A", SAE1349 correction - 638.2 rwhp
5/10/2013: Dynojet shop "B", SAE1349 correction - 634.1 rwhp

I realize this is but one like-for-like comparison, but three different chassis dyno tests, across two days and two shops, and nearly 1 year apart. the variance is 4 hp.

The same engine, on the superflow engine dyno, at the same atmospheric correction, was only 30-35 hp higher. Maybe that engine dyno is a bit stingy? However, using the internet accepted 15% driveline loss, that engine should have made close to 750 brake horsepower on the engine dyno. Unlikely.

I've tested a couple others on that engine dyno, but unfortunately haven't done a chassis dyno on those. Not my engines, so not so easy to do the comparison testing.

Sorry, didn't mean to get off topic. I'm expecting a solid 550-560 brake hp out of this cammed 350 cid project.

02-12-2018	#13
tpepmeie Join Date: Aug 2005 Location: Fishers, IN Posts: 813	Re: Winter build Stock CID project 427 LT5 build 1 observations 1/19/2011: SF901 Engine Dyno, 300 rpm/sec, SAE1349 correction - 669 bhp [703 using STP correction] 8/9/2012: Dynojet shop "A", SAE1349 correction - 637.2 rwhp 5/10/2013: Dynojet shop "A", SAE1349 correction - 638.2 rwhp 5/10/2013: Dynojet shop "B", SAE1349 correction - 634.1 rwhp I realize this is but one like-for-like comparison, but three different chassis dyno tests, across two days and two shops, and nearly 1 year apart. the variance is 4 hp. The same engine, on the superflow engine dyno, at the same atmospheric correction, was only 30-35 hp higher. Maybe that engine dyno is a bit stingy? However, using the internet accepted 15% driveline loss, that engine should have made close to 750 brake horsepower on the engine dyno. Unlikely. I've tested a couple others on that engine dyno, but unfortunately haven't done a chassis dyno on those. Not my engines, so not so easy to do the comparison testing. Sorry, didn't mean to get off topic. I'm expecting a solid 550-560 brake hp out of this cammed 350 cid project.