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

[john harper]

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
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
> Healeys at autox.team.nethttp://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/coudesluijs@chello.nl
>
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
> Healeys at autox.team.nethttp://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/frogeye@porterscustom.com
>
> --
> Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World go here: WWW.PORTERBIKES.COM/
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Archive: http://www.team.net/pipermail/healeys
> http://autox.team.net/archive
>
> Healeys at autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/healeys/ah100tech@gmail.com
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20210125/39f4fc57/attachment.htm>