Lotus Elan

Trigger wheel

PostPost by: gav » Mon May 26, 2014 9:48 pm

Iain

That's exactly what I'm trying to do.

Where did you source your trigger wheel and how did you fit it - and did you rebalance after?

Many thanks
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PostPost by: jono » Tue May 27, 2014 1:43 pm

Gav,

Iain's system looks very similar to my own.

(Iain - I would be very interested to know where you sourced the sensor bracket as that is exactly what I need?)

Back to Gav - my trigger wheel came from Trigger-wheels.com. I just asked for a wheel to work with an Edis 4 and it does the job perfectly, cost around ?18.

http://trigger-wheels.com/store/contents/en-uk/d5.html

Fitting was quite simple. I drilled and tapped 4 equally spaced holes on the back of the Burtons pulley and fixed the trigger wheel using countersunk cap-head allen screws with loctite. I also machine the pilot hole out so that the wheel was a snug fit on the shaft of the toothed pulley

I'm no engineer but I would have thought that any imbalance introduced by the trigger wheel would be negligible. My engine had received a full dynamic balance and it spins up like a sewing machine with the trigger wheel fitted.

I hope this helps

Jon
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PostPost by: ort » Tue May 27, 2014 8:26 pm

hi guys
both the trigger wheel and sensor bracket I machined up as I couldn't find anything off the shelf that would fit neatly.
The trigger wheel is of a dia to match the timing marks to make set up easier. the pulley has been shortened slightly to line up the pulleys better. the trigger wheel is a sliding fit over the pulley seal dia and secured with 4 c'sk screws. When I had the new crank balanced the pulley didn't effect the balance

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PostPost by: gav » Tue May 27, 2014 8:59 pm

Iain

That's impressive - do you take on commissions?

Jon
If Iain doesn't, what size trigger wheel did you use and does the thickness matter?

Thanks again
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PostPost by: ort » Tue May 27, 2014 9:27 pm

Gavin
depends on time scale you are looking at
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PostPost by: gav » Wed May 28, 2014 4:49 am

Iain
If I were to say the end of August might that work?
Thanks
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PostPost by: john.p.clegg » Wed May 28, 2014 12:25 pm

Gav

"Do you happen to know the relationship of the woodruff key to TDC (or am I being ambitious)"

I've not had my degree disc on it but it looks in line with the journals for Nos 1 and 4,ie. TDC at the top.

John :wink:
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PostPost by: ort » Wed May 28, 2014 8:22 pm

Gavin
that should be ok for me. PM me to let me know what you want

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PostPost by: gav » Fri May 30, 2014 7:46 pm

Many thanks John - much appreciated

Iain - thanks I'll pm you

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