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New Engine Struggling Under Load

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#16 Earwax


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Posted 30 November 2020 - 12:47 AM

Fuel   --  you are concentrating on this area , with lots of advice


Air     - i would take it for a run without any air filter just to eliminate oxygen starvation,, but again your methods seem fine


Spark   -  don't assume anything here.  I have spent too many hours faffing around because i assumed plugs and gap, leads, and importantly condenser or electronic ignition were all new and therefore ok.  You may have to substitute for a known good working dizzy to check the electonic ignition. Good luck

#17 johnR


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Posted 30 November 2020 - 10:36 AM

What colour are your plug deposits?

#18 richmondclassicsnorthwales


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Posted 30 November 2020 - 11:19 AM

I have never gone in to needle profiles. One thing I can send you is a comparison chart which maps different needles. Hope this helps.




#19 minidave54


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Posted 30 November 2020 - 12:06 PM

Just to clarify my timing of 12 degrees was carried out using a timing light with the engine running and the vacuum advance disconnected and blanked. The setting is basic to get the engine running before heading to a rolling road.

For info, with the spec of the my engine I mentioned, on a rolling road session it produced 78 BHP. Standard plugs and air filter fitted..

#20 AndrewT


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Posted 30 November 2020 - 04:23 PM

Put a BDL needle in then re-adjusted the mixture.  Made a massive improvement.  Still a little hesitancy under throttle but at least it's driveable enough to get it run in before a rolling road session.

#21 cal844


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Posted 30 November 2020 - 06:43 PM

If its still hesitant it still needs fuel IMO BUT without driving the car I can't be 100% sure

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