Dyno Testing at PFM Engineering 7/16

#21

Results of the dyno day on a Dynapak
Listed are the two best pulls for each car

[table]
[tr]
[td]Car[/td]
[td]Max HP[/td]
[td]RPM[/td]
[td]Max Trq[/td]
[td]RPM[/td]
[/tr]
[tr]
[td]191 – Eric[/td]
[td]136.07[/td]
[td]5600[/td]
[td]137.31[/td]
[td]4250[/td]
[/tr]
[tr]
[td]191 – Eric[/td]
[td]136.94[/td]
[td]5550[/td]
[td]138.19[/td]
[td]4350[/td]
[/tr]
[tr]
[td]919 – Julio[/td]
[td]134.00[/td]
[td]5450[/td]
[td]135.71[/td]
[td]4300[/td]
[/tr]
[tr]
[td]919 – Julio[/td]
[td]133.03[/td]
[td]5500[/td]
[td]134.77[/td]
[td]4400[/td]
[/tr]
[tr]
[td]53 – Fred[/td]
[td]130.07[/td]
[td]5500[/td]
[td]135.39[/td]
[td]4350[/td]
[/tr]
[tr]
[td]53 – Fred[/td]
[td]130.12[/td]
[td]5500[/td]
[td]134.42[/td]
[td]4350[/td]
[/tr]
[tr]
[td]401 – Chuck[/td]
[td]145.49[/td]
[td]5500[/td]
[td]147.00[/td]
[td]4450[/td]
[/tr]
[tr]
[td]401 – Chuck[/td]
[td]145.33[/td]
[td]5450[/td]
[td]147.40[/td]
[td]4400[/td]
[/tr]
[tr]
[td]911 – Laura[/td]
[td]132.68[/td]
[td]5550[/td]
[td]137.61[/td]
[td]4350[/td]
[/tr]
[tr]
[td]911 – Laura[/td]
[td]132.47[/td]
[td]5550[/td]
[td]136.76[/td]
[td]4300[/td]
[/tr]
[tr]
[td]241 – Patton[/td]
[td]143.92[/td]
[td]5500[/td]
[td]148.82[/td]
[td]4550[/td]
[/tr]
[tr]
[td]241 – Patton[/td]
[td]144.34[/td]
[td]5450[/td]
[td]147.96[/td]
[td]4550[/td]
[/tr]

[/table]

#22

:ohmy:
Honestly I was expecting readings at least 10hp higher

#23

Honestly I was expecting readings at least 10hp higher[/quote]With a DynoJet, you would get that additional 10 hp or more. Seems like I’ve heard ~10% difference between the two.

Chuck & Robert - Congrats on the good home builds!

#24

Honestly I was expecting readings at least 10hp higher[/quote]

Yup, we were told to expect on a dynojet the readings would be 10hp higher.

#25

Nice numbers. Only 15 hp difference between motors is not too bad. Did you guys get A/F plots? How were the curves on the 145 hp motors versus the 130 hp motors?

#26

what color is the sky in your world?

just kidding! you’re right, 15hp isn’t bad at all. provided you’re the +15 guy.

#27

[quote=“jtower” post=58643]you’re right, 15hp isn’t bad at all. provided you’re the +15 guy.[/quote]:whistle:

#28

[quote=“jtower” post=58643]what color is the sky in your world?

just kidding! you’re right, 15hp isn’t bad at all. provided you’re the +15 guy.[/quote]

Apparantly not dark grey. I think for a 20+ year old engine only having a 10% difference in power is not that bad. I’m here for the fun. I have plenty of mugs at home already.

#29

[quote=“Steve D” post=58633][quote=“DDO” post=58625]:ohmy:
Honestly I was expecting readings at least 10hp higher[/quote]With a DynoJet, you would get that additional 10 hp or more. Seems like I’ve heard ~10% difference between the two.

Chuck & Robert - Congrats on the good home builds![/quote]The head shop guy (all those fellows were super-nice) said it was, for engines in our “range” a 10hp difference between his equipment and BPM. I was hoping for more like 10% than a straight 10hp. Happy to win the HP shootout, but I might still be bringing a gun to knife fight next month. Wish we really had a trustable, portable, atmospheric-proof way of comparing different cars on different days, but unfortunately that’s not the case.

It really was a basic home rebuild (more like home reassembly). This wasn’t a rebuild of my old race engine. It was a core I’d been saving for 5 years. Basic process was:
Disassemble 150K mile tired street engine. Send head/block to machine shop. They cleaned everything up, replaced the exhaust valve guides and no other parts. Reassemble with new OEM cam/valve springs, new oil pump, old rockers, crank, pistons/rods, and reuse all externals. My theory was to replace the parts that make it an effective air pump.

Fresh plugs and a single day at the track for break-in.