[Healeys] Backfire in rebuilt engine with less than 500 miles

[Michael Oritt]

...or an exhaust leak, or too rich or too lean, or too much advance, etc.

You might have to put the car on a chassis dyno in order to replicate and
cure the issue.  Or stop going so fast, but who wants to do that?

Best--Michael Oritt

On Mon, Jan 25, 2021 at 11:51 AM john harper <ah100tech at gmail.com> wrote:

> David
>
> It is possible that your fuel pump cannot quite keep up with the fuel
> needed at this top limit. I don't know what pump you have fitted but the
> square base version or the double version give a higher flow rate.
>
> Before making major changes it might be worth checking that the pump has
> the correct diaphragm travel.
>
> On Mon, 25 Jan 2021 at 16:41, David P <frogeye at porterscustom.com> wrote:
>
>> ..or a momentary loss of power to the fuel pump or delivery pressure.. or
>> a sticking valve.. many possibilities..
>> On 1/25/2021 9:20 AM, Kees Oudesluijs wrote:
>>
>> Some parts like i.e. the distributor or carbs are taken of the engine
>> when it is rebuild and then after having lain on the shelf for months or
>> even years are put back on the engine the way they came off, without
>> resetting or cleaning.
>>
>> In the distributor are the bob weights inside the body that regulate the
>> mechanical advance. These need regular maintenance (mostly forgotten) to
>> prevent them from corrosion and sticking. It is not seldom that these get
>> stuck or do not move freely which might be a cause for backfiring. Also
>> check the plugs and wires.
>>
>> If the car is still on points check the dwell angle and points condition.
>> Also check the timing.
>>
>>
>> Kees Oudesluijs
>>
>>
>>
>>
>> Op 25-1-2021 om 15:57 schreef rfbegani at gmail.com:
>>
>> Listeners:
>>
>>
>>
>> I have been driving my 67 BJ8 since rebuilding and working on the rest of
>> the car the past year.  After installing the new shock absorbers and the
>> new speedo, I took the car for a ride.  With the new shocks and the new
>> Shaved tires, she drives like brand new car down the Tamiami Trail at 50-70
>> mph, so I decided to push it a little more.  However at 4000 plus rpms and
>> about 90 mph, I was not looking so closely at the speedo or tack, the
>> engine back fired, so I let off the gas and returned to normal highway
>> speeds.  Engine ran fine all the way home. Suggestions what could cause the
>> backfire at high speeds?
>>
>>
>>
>> Bob Begani
>>
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