2.7 RS/Euro Carrera actual stock dyno bhp

[lvporschepilot]

Hi everyone, I know the 2.7RS/Euro Carrera motor is rated as producing 210bhp, but most places I'm seeing with actual flywheel dyno figures performed on something like a DTS or Superflow dyno show around 220-225 in entirely stock form. Are they just freaks or is that the norm with these things? I've always known Porsche to quote their bhp figures as a minimum figure, while Ferrari in the same era quoted their figures about 10% higher than actually produced.

[fanaudical]

My understanding - and this is complete hearsay and I've got zero references to back this up - is that back in the day Porsche HP/torque numbers were generally stated as "guaranteed minimums" and that actuals were sometimes ~10-20% higher. I'm sure others here on the board have more relevant data on the topic.

[lvporschepilot]

Anyone? Paging Henry

[Henry Schmidt]

Throughout the years, we've seen dyno numbers pretty consistence with Porsche claims.
Over the last few years we've been seeing dyno numbers climb.
We have been experimenting with dry-film lubricants and with a proprietary system/process for rebuilding rockers. All of which reduce parasitic loss due to friction.
The dyno numbers we saw on the last "factory stock" RS engine was 223hp on a third party (Heads Up) dyno.
Much to our surprise, we also see higher hp numbers with Delo 400 15x40 than with Brad Pen Grade 1 15w40

[stownsen914]

Before the mid-1970s or so, Porsche quoted dyno figures using the DIN hp standard, which typically come in lower than the SAE standard that is commonly used since then. Porsche switched around that time presumably to take advantage of the higher SAE numbers that all the other manufacturers were already using

DIN hp was measured with all the ancillary stuff still hooked up. In the case of a 911 back in the 70s, that was basically the alternator and fan. SAE hp is measured with the ancillaries being driven by an external source, hence the higher hp number.

I believe the 2.7RS was quoted as 210 DIN hp, and I saw somewhere that the same engine was rated at 230 SAE hp, which seems about right that the fan (and alternator at light duty) consumes roughly 20 hp.

A little reading for those who may be curious: https://en.wikipedia.org/wiki/Horsepower

Scott

[lvporschepilot]

Answers a ton. Thanks much guys

[manbridge 74]

Somewhere? It's in the Tech Spec book for 1973.