Tr6PI Posted February 14, 2017 Report Share Posted February 14, 2017 Hi Guys, I'm planning to fit my TR6 PI with the 123 ignition distributor (number 8898 without vacuum port). As you know, it has 16 pre-memorized curves selectable by a rotary switch. My car configuration is basically stock CP 150bhp, original Lucas injection, fitted with a sport exhaust. By watching the original ignition curve of the lucas 22D distributor on the manual, the most similar curve of the 123 distributor seem to be the number 0 (zero). There is someone with more experience than me that it's using my same configuration? Which curve you have chosen on 123 ignition? Quote Link to post Share on other sites
Guest ntc Posted February 14, 2017 Report Share Posted February 14, 2017 B Quote Link to post Share on other sites
Peter Cobbold Posted February 14, 2017 Report Share Posted February 14, 2017 Matteo, If it pinks upon flooring the throttle it can be cured with this curve (devised by a professional auto-engineer ) and run on 95RON octane. http://prntscr.com/e8tscc Peter Quote Link to post Share on other sites
Guest ntc Posted February 14, 2017 Report Share Posted February 14, 2017 Nope should not pink at 11 strobe Quote Link to post Share on other sites
Peter Cobbold Posted February 14, 2017 Report Share Posted February 14, 2017 Nope should not pink at 11 strobe On 95RON? And not stinking rich? Quote Link to post Share on other sites
Guest ntc Posted February 14, 2017 Report Share Posted February 14, 2017 Yep supermarket fuel and no smell. Quote Link to post Share on other sites
Peter Cobbold Posted February 14, 2017 Report Share Posted February 14, 2017 Plenty on here having to use 99RON to stop pinking..and low 20s mpg What's the trick they're missing? Quote Link to post Share on other sites
Tr6PI Posted February 14, 2017 Author Report Share Posted February 14, 2017 As always very professionals! Thanks! I will start with B curve like Neil advice. Also the Peter advice it's to take into consideration. Sometimes with old distributor i've had problems with engine knocking/pinking but up to now i've not understand if it's related with fuel mixture, advance curve, intake temperature........ i must to understand....the last time i've found the spark plugs dry fouled... Quote Link to post Share on other sites
Peter Cobbold Posted February 14, 2017 Report Share Posted February 14, 2017 (edited) As always very professionals! Thanks! I will start with B curve like Neil advice. Also the Peter advice it's to take into consideration. Sometimes with old distributor i've had problems with engine knocking/pinking but up to now i've not understand if it's related with fuel mixture, advance curve, intake temperature........ i must to understand....the last time i've found the spark plugs dry fouled... Matteo, The Lucas PI lacks a 'throttle pump' to squirt extra fuel when suddenly opening the throttle.To try to compensate the PI idle mixture has to be set rich, to keep the manifold walls wet with fuel. If the wall dries out at tickover the pinking/knock can occcur upon flooring the throttle suddenly. I've explained how a throttle pump prevents this manifold fuel-octane fractionation here: slides 91-99. https://supertrarged.files.wordpress.com/2016/07/combustion-talk-iwe-2016-v2-ppt.ppt Its described in the textbooks of slide 4. Peter Edited February 15, 2017 by Peter Cobbold Quote Link to post Share on other sites
stuart Posted February 15, 2017 Report Share Posted February 15, 2017 Yes setting B and supermarket jungle juice. Put it all together right and it will be quite happy at that. Stuart. Quote Link to post Share on other sites
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