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CP PI IGNITION ADVANCE


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Posted (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 by John McCormack
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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.

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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!

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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?

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