[Healeys] Sedan engine hp ratings

Wilko2 e-wilkins at cox.net
Fri Nov 21 13:13:51 MST 2014

The better breathing design and cams could easily account for performance

On Nov 21, 2014, at 1:44 AM, Andy Thorp wrote:

> Hi Guys,
> I wonder if anyone could help me out with the hp rating of the 2912cc sedan
> engines.
> The 'mk1' engine of the 1959 A99 was rated at 103hp, an increase of only
> on the 2693cc A105 (BN4) engine and it appears to only differ in bore size
> the smaller engine. The 'Mk2' engine in the 1961 A110 sedan then produced
> 120hp with only a 0.1 point increase in compression and revised exhaust cam
> timing per the Mk2 Healey engine. Both engines look identical to the BN4
> with the gallery head and twin H4s so it isn't the DMH head giving the
> performance. The valve sizes are the same, compression almost the same,
> the same... Could adding 22 degrees to the exhaust timing really make 18
> hp?
> Andy.
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