[Healeys] BHP - the real figures.

[Derek Job]

Rick,

Yes that's true so it's not a fair comparison. Plus of course the only hp
that really matters I suppose, is that which finds its way to the wheels.
And there goes another 20 to 30%!

So I guess, at the wheels a stock BJ8 has about 95-100 hp.




On Thu, May 31, 2012 at 5:10 PM, HealeyRick <healeyrick at yahoo.com> wrote:

> Derek,
>
> I'm sure the factory ratings were "optimistic", however they were also
> rated differently than your rolling road test.  Factory numbers were
> obtained without any engine accessories on an engine dyno. The same engine
> on a rolling road would be somewhere in the neighborhood of 15-20% less
> powerful due to the parasitic losses of the driveline, engine accessories
> and silencers.
>
> Rick
>
> Follow My Nasty Boy Build: http://tinyurl.com/yj52fwo
>
> --- On *Thu, 5/31/12, Derek Job <derek.c.job at gmail.com>* wrote:
>
>
> From: Derek Job <derek.c.job at gmail.com>
>
> Subject: [Healeys] BHP - the real figures.
> To: "Forum" <Healeys at autox.team.net>
> Date: Thursday, May 31, 2012, 11:37 AM
>
> In preparation for my first competitive outing  I took the car to a
> specialist with a rolling road to give it the once over generally and set
> everything for optimum performance. He is a  well known guy in motor sport
> circles having prepared various Pro-rally teams cars as well as a lot of
> exotic classics including Miuras and Ferrari 250s. One of the reasons he
> got the rally prep jobs was because they were impressed that had the most
> accurately calibrated dyno, which translates to one that produces real, but
> lower figures than most of the others.
>
> My car has a BJ8 engine, twin HD8s, DWR8 'fast road cam, polished and
> ported iron head, six branch manifold, itg fast flow filter. Compression
> came in at 195 pretty much across the board and he thought the comp ratio
> would be around 10.5 : 1. Maximum ignition advance was 31 degrees initially
> but when we optimised the performance i think it was advanced a tiny bit
> further. I will check it's exact current setting when I get chance
>
> The result.
>
> Maximum power is 160 bhp at 5500 revs.
>
> Max torque is 158 ft/lbs at 3100 revs and stays flat until 4700.
>
> Torque is 140ft lbs at 1700 so there is a very broad and useable power
> band.
>
> I think we can safely say a stock BJ8 never produced 150 bhp!
>
> He told me that  whenever he tests classic cars there is always a very
> large difference between reality and the bhp figures stated at the time.
>
> Derek
> www.healeysix.net
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