[Healeys] Power band of two different motors, or is it the rear end?

[Alan Seigrist]

Jerry -

The very first thing I'd check for is slop and maladjustment of the
throttle linkage.  If you are only getting a max 3/4ths-4/5ths
throttle or something like that due to bad adjustment of the linkage,
the difference in power would be VERY apparent.  I know from personal
experience on this.

Alan


On 7/8/11, Jerry Costanzo <grumpyinloomis at ssctv.net> wrote:
> I have two Healeys,  one is a BN4 with a 3000 engine, HD8 carbs and a 4.1
> differential.  The other is a BJ8 with a 3000 engine , HD8 carbs and a 3.9
> differential.  I built both engines.  The BN4 is 30 over and the BJ8 is
> stock.
> The BN4 head has been slightly ported, not on the BJ8.  The BJ8 has headers.
> Driving he BN4 today gives me the impression that it has more horsepower.  I
> was on the freeway and if you step on it, it will accelerate away.  I still
> donb t feel that on the BJ8.  It accelerates, but nothing like the earlier
> car.
> Is it the rear end difference or did my slight porting (clean up of the
> ports
> for the most part) make that much difference?  The only other thing I donb t
> know is the cam profile on the BN4.  The car was raced before I got it and
> the
> machine shop said it was still in good shape so I put it in the engine.
>
> Opinions?
>
> Jerry
> BN4
> BJ8
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