My first Healey was a BN4 that originally did not come with overdrive. When
I got it it ti had a BT7 engine/overdrive in it.
That car was fast with mild cam enhancement, balanced and bored 40+.
The car was wrecked and I bought a rolling BT7 car that originally came with
overdrive. I swapped out the drive line, suspension and wire harness, dash
and gauges into the new body. It was not as quick as the old car. The only
difference was the rear end gearing.... same engine, same tranny, same
driver
On Fri, Jul 8, 2011 at 8:07 AM, Eric (Rick) Wilkins <e-wilkins at cox.net>wrote:
> WHat are the cams in the two engines. Those alone can make a serious
> difference.
>
> On Jul 7, 2011, at 9:42 PM, Jerry Costanzo 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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--
Ira Erbs
Portland, OR
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(______ \____1960 BT7____/ _______)
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