I recently did some dynoing of a BN4 gallery head engine as part of my
rebuild. Stock engine gave about 80hp at the gearbox output flange in 4th gear
and after a little fettling I got 106hp. The factory claim of 142lbft torque
is fanciful, the hp figure of 102 is optimistic at best.
Stock baseline runs
were done with a different engine that had never been apart from new but was
in good health. All runs done on an waterbrake dyno mounted in the old chassis
and calibration was checked each day.
Graphs and videos of the testing here
http://www.britishcarforum.com/bcforum/ubbthreads.php/ubb/showflat/Number/846
675
Andy.
--- On Fri, 1/6/12, Derek Job <derek.c.job at gmail.com> wrote:
>
From: Derek Job <derek.c.job at gmail.com>
> Subject: [Healeys] BHP - the real
figures (contd)
> To: "Forum" <Healeys at autox.team.net>
> Received: Friday, 1
June, 2012, 7:49 AM
> My message got bounced so I've
> started a new one.
>
>
Just to be clear, my 160 bhp is at the flywheel not the
> wheels.
>
> To
summarise my understanding
>
> - The factory 150bhp was at the flywheel with
the engine but
> no ancillaries
> at all. So really more like 120-125 with
ancillaries.
>
> - My back calculated 160 bhp is at the flywheel but
> with
all the
> ancillaries included.
>
> - That difference seems reasonable given
the cam and other
> modifications
> that my car is running. I have straight
cut gears which I
> supposed helped a
> little in the back calculation.
>
> -
Different dynos give different results. My guy said that
> cars he tested
>
regularly showed 20 to 30 bhp less than the owners had
> obtained on other
>
dynos. His comes in bang on with the factory when he tests
> brand new BMWs
>
and Mercs.
>
> - You can deduct another 20-25% or so from the above numbers
>
to arrive at
> the rear wheel bhp numbers.
>
> Andy, I would be very
surprised if your stock car is really
> making that
> 150bhp at 5000 revs.
>
> Derek
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