Power outputs

[andrew34ruby]

HI All,
I would like to know the TORQUE Figures and at what RPM it levels off at with these Engines,
For me Quoting  Hp is Irrelevant.

Colin
NZ
.

Colin, it's bhp that matters, but if you want torque it's easy to work it out......   torque x revs = bhp

so.......  torque = bhp/revs

This would give you torque at the revs of max bhp, not max torque, but might be useful.

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Looking at the technical specifications published in sales brochures over the years, the official power output of the Seven is given as follows:

1922-23 10bhp at 2,400 rpm (696cc engine)
1923-32 10.5bhp at 2,400 rpm (747.5cc engine, up-draught carb)
1933-35 10.5bhp at 2,400 rpm (side-draught carb and revised exhaust manifold)
1935-36 13.5bhp at 3,000 rpm (presumably higher-comp 1A684 cylinder head)
1936-38 17bhp at 3,800 rpm (3-bearing engine with high-comp cylinder head)

Which raises a few interesting questions (well, it does to me!).

Did the 7.5% increase in engine capacity in 1923 really only provided a 5% increase in power?
Doesn't the 1933 side-draught carb and associated manifold not provide a bit more power?
If the earlier engines are rev'd to 3,000rpm as quoted for 1935-36, how much more power is achieved?
Similarly, if revs are increased to the 3,800rpm used for the 3-bearing engine, how much more power do the earlier engines produce?

Thoughts, anyone?

I would expect all of those figures to be maximum bhp.  So if an earlier engine was rev'd to 3,000 I would expect the bhp to drop below the quoted 10.5.
Similarly the bhp would drop further if revd to 3,800.

Increasing revs leads to a proportional increase in power if torque stays the same. But torque would be at a maximum at lower revs, maybe 2,000. So increasing revs from say 2,400 to 3,000 would lead to a big decrease in torque, an increase in revs, and a resultant moderate reduction in bhp.

With any engine, what really matters is the bhp at the revs you actually use.