James Posted September 4, 2009 Share Posted September 4, 2009 What isn't perfect about the MJ? It does exactly what you tell it - if you tell it xx degrees at xx rpm and xx pressure it will do it. Unless either your trigger wheel or sensor are vibrating then it's as accurate as you can get it? Link to comment Share on other sites More sharing options...
DaveNotSoSideways Posted September 4, 2009 Share Posted September 4, 2009 Using the dissy is just a bad idea. I noticed on some pictures that Craigs Charger belts were loose...Needs a tensioner. Why on earth is it using fanbelts? Must slip alot!...Those expensive alloy pullies will soon wear out, far better in steel, nowt to be gained on such a small item by means of weight...everything to be lost in terms of durability. Link to comment Share on other sites More sharing options...
James Posted September 4, 2009 Share Posted September 4, 2009 Yeah - he's thinking about that - but didn't have a problem with it before. He has some new belts so it should be ok for our Europe run. Link to comment Share on other sites More sharing options...
JamesR Posted September 4, 2009 Share Posted September 4, 2009 What isn't perfect about the MJ? It does exactly what you tell it - if you tell it xx degrees at xx rpm and xx pressure it will do it. Unless either your trigger wheel or sensor are vibrating then it's as accurate as you can get it? Well its only as accurate as the person putting in the numbers that's all I ment. There are no perfect curves. Plainly it removes the mechanical part of the idiot scheme. Link to comment Share on other sites More sharing options...
Mother Teresa Posted September 4, 2009 Share Posted September 4, 2009 I've had trouble setting the ignition timing with a worn chain. At idle it was not to bad but at higher revs you couldn't even see the mark any more. I'd say the scatter was at least 10deg. Note, this was with electronic ignition in a Lucas distributor. There are several effects which have effect on the accuracy of the timing. Timing chain wear, acceleration/decceleration backlash, polygon effect of the chain, oil pump gear lash. With it all in good condition and no points, my guess is you would have about 3degrees of scatter. Be interested to hear of the test results if you'd do it. Frederick I think you've summed it up well there Frederick. Just seems a pointless(sic) exercise the whole dizzy idea, if you can fit it on the end of the crank as easily as you can on the Triumphs? :-/ Link to comment Share on other sites More sharing options...
James Posted September 4, 2009 Share Posted September 4, 2009 The perfect curve is obtainable though... via rolling road... or if you have a very sensitive arse ;D Link to comment Share on other sites More sharing options...
spitNL Posted September 4, 2009 Share Posted September 4, 2009 The perfect curve is obtainable though... via rolling road... or if you have a very sensitive arse ;D You'll need Dave for that. ;D ;D Link to comment Share on other sites More sharing options...
Mother Teresa Posted September 4, 2009 Share Posted September 4, 2009 No word of a lie but I was cycling home from work the other week when a women in the car adjacent to me looked across and said: "Nice arse! "- is that what she meant ;D? Link to comment Share on other sites More sharing options...
Nick Jones Posted September 4, 2009 Share Posted September 4, 2009 Must be a cyclist thing... Nick Link to comment Share on other sites More sharing options...
DaveNotSoSideways Posted September 4, 2009 Share Posted September 4, 2009 Who says I am a sensitive arse? :K) Link to comment Share on other sites More sharing options...
spitNL Posted September 4, 2009 Share Posted September 4, 2009 You said it yourself, it was something like: "I can feel the slightest power differences through the seat" Link to comment Share on other sites More sharing options...
DaveNotSoSideways Posted September 5, 2009 Share Posted September 5, 2009 Ok (devil2) Link to comment Share on other sites More sharing options...
spitNL Posted September 8, 2009 Share Posted September 8, 2009 Just found this, interesting info if you want to mount the triggerwheel in the dizzy. Rule: Expect 0.1% to 0.5% loss in Torque for each 1 degree error in spark timing advanced or retarded from best timing. Also, detonation will occur with spark advanced only 3 degrees to 5 degrees over best timing and detonation will cause 1% to 10% torque loss, immediately, and engine damage if allowed to persist. Link to comment Share on other sites More sharing options...
Recommended Posts