JohnTB Posted August 6, 2019 Report Share Posted August 6, 2019 1970 CP on Injection. Just replaced standard cam with Piper Mild. Does anyone have good ignition timing info for this Cam. I am using a 123 Dizzy and previously (with the standard, albeit a bit worn cam) I set at 12 BTDC at 1k revs and setting 'D' which was the closest to the Workshop Manual Curve. This setting was fine, but I now find I have lumpiness on low acceleration and on the over ride (ie butterflies closed, decelerating). Quote Link to post Share on other sites
TriumphV8 Posted August 6, 2019 Report Share Posted August 6, 2019 Unfortunately this cam seems to be closer to the CR cam than similar to the CP cam you took off. I would recommend to check the mixture under driving condition with a wideband AFR. The timing should not be affected that much. If you do not have pinking aim for 20 degrees at 2000 and 30 degrees at 3000. That might require some of the higher 123 settings like "E". Be prepared to swap the metering unit to a CR type due to higher vaccuum in the manifolds now. Quote Link to post Share on other sites
JohnTB Posted August 6, 2019 Author Report Share Posted August 6, 2019 Thank you. Quote Link to post Share on other sites
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