Mark Taxis
Joined: 02 Apr 2007
Posts: 226
Location: Queensland Australia
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 Posted: Thu Jan 19, 2017 11:14 pm Post subject: Mk 6 Dwell angle |
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My Mk6 special has been converted to a single point system using a 6 lobe cam,
I have recently bought a multimeter that can measure dwell angle, what would be an acceptable dwell angle range?
I have read that a 6 cylinder engine should have a dwell angle between 35 - 37 degrees - Would this be correct? I have measure the current dwell angle and I am getting 58 degrees at 550 rpm, decreasing to 52 degrees at 1500 rpm .
This would indicate that I need to reset the points,
Any info on this subject would be well received
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Mark Taxis
Sunshine Coast
Queensland 4560 |
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Stephen Blakey
Joined: 02 Feb 1995
Posts: 1337
Location: Derbyshire, United Kingdom
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| Posted: Fri Jan 20, 2017 3:44 pm Post subject: |
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I wonder if you've got part or all of the Delco D200 series distributor which is interchangeable with the earlier Delco unit on the MKVI?
When used on the Triumph GT6, this had a dwell of 41 degrees +/- 1 degree.
Strangely, the same car fitted with a Lucas distributor had a dwell angle of 35 degrees +/- 3. Either way it looks like you're getting too much.
Back in the day, dwell angle was a near obsession with folks running V8's with contact breakers. It's a long time since I've heard of anyone going there. Good luck. |
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Christopher Carnley
Joined: 16 Nov 2007
Posts: 2746
Location: Yorkshire, United Kingdom
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| Posted: Fri Jan 20, 2017 4:15 pm Post subject: |
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The dwell angle should not exceed 42 degrees or the coil will overheat.
58x 6=348 degrees, I am surprised that the coil still works. |
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Al Coutts
Joined: 25 Sep 2016
Posts: 108
Location: Norfolk, United Kingdom
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| Posted: Fri Jan 20, 2017 4:20 pm Post subject: |
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| Were you not having issues with this car in a previous post after long runs on hot (Oz) days? Could coil degradation not be the root cause? |
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Mark Taxis
Joined: 02 Apr 2007
Posts: 226
Location: Queensland Australia
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| Posted: Fri Jan 20, 2017 7:49 pm Post subject: |
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Yes the coil was running very hot and likewise I am suprised it still works
I could not get the points set properly so I invested in a $45 Auto multimeter, now I can read the dwell angle and the RPM.
This proved that the points gap were wrong and also that the rev counter in the car is wildly inaccurate.
I have set the dwell angle to 36 which I think is nearer the right setting.Also by reducing the dwell angle I now have a steady reading accross all revs.
this may be the root cause or at least a part of the problem I experienced a few months ago.
Regards
Mark
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Mark Taxis
Sunshine Coast
Queensland 4560 |
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