Andy Moltu Posted March 30, 2022 Report Share Posted March 30, 2022 At 4k rpm the dizzy should be maximally advanced - aim for around 32 degrees btc and you should be about right in terms of performance and avoiding pinking. Quote Link to post Share on other sites
John McCormack Posted March 31, 2022 Author Report Share Posted March 31, 2022 (edited) 10 hours ago, Mick Forey said: John, what is the maximum advance at say 4,000rpm? What fuel do you use? Mick As best as I can read it, it is 35 deg BTDC above 3-3,500. I only went to an engine speed where it stopped advancing which was about 3,500. I always use BP 98 and we don't have ethanol in such fuels here. Edited March 31, 2022 by John McCormack Quote Link to post Share on other sites
John McCormack Posted March 31, 2022 Author Report Share Posted March 31, 2022 9 hours ago, Andy Moltu said: At 4k rpm the dizzy should be maximally advanced - aim for around 32 degrees btc and you should be about right in terms of performance and avoiding pinking. As I noted in the other post it is about 35 deg BTDC above 3-3,500 rpm. I have a good ear for pinging and it wasn't pinging under any conditions with it set at 18 deg BTDC at idle. I retarded it 3 deg to be on the safe side. I had to get our equivalent of an MOT this morning and took it to our Triumph specialist. He took it out and agreed it isn't pinging. Quote Link to post Share on other sites
Andy Moltu Posted March 31, 2022 Report Share Posted March 31, 2022 All good then. Quote Link to post Share on other sites
CP26309 Posted March 31, 2022 Report Share Posted March 31, 2022 Timing aside...I once had a sluggish response to throttle after I had replaced various rubber pipes and hoses, and it turned out to be a blockage in the vacuum rubber hose that goes from the inlet manifold to the M/U! I discovered this by simply blowing down the M/U end...and I couldn't! A new rubber hose restored all the missing Oomph again! Just a thought! Quote Link to post Share on other sites
John McCormack Posted April 1, 2022 Author Report Share Posted April 1, 2022 20 hours ago, CP26309 said: Timing aside...I once had a sluggish response to throttle after I had replaced various rubber pipes and hoses, and it turned out to be a blockage in the vacuum rubber hose that goes from the inlet manifold to the M/U! I discovered this by simply blowing down the M/U end...and I couldn't! A new rubber hose restored all the missing Oomph again! Just a thought! What was blocking it? Had it collapsed inside? Quote Link to post Share on other sites
CP26309 Posted April 2, 2022 Report Share Posted April 2, 2022 On 4/1/2022 at 8:15 AM, John McCormack said: What was blocking it? Had it collapsed inside? Yes! Quote Link to post Share on other sites
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