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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 11-10-2012, 07:06 PM   #21 (permalink)
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The standard keyway and timing mark should be OK for the 3134 exhaust cam,and give the same exhaust timing as a 650:
Opens 55 BBDC,closes 34 ATDC ;measured at 0.020" tappet lift.
Lobe centre 100.5 degrees BTDC.
0.125"- 0.130" tappet lift at TDC.

If the lobe centre is anywhere between 100 degrees and 105 degrees BTDC,it will work fine.

Tell them to hone the cylinder bores with #180 grit,or even #150 grit,to give at least 0.0037" piston skirt clearance.If it's honed finer than #220 grit,it will be harder to seat the rings.It still pays to put no oil on the rings or ring grooves,just a drop on each side of the skirt.
Scrub the cylinders well with hot soapy water,before you fit the pistons.Oil them to stop rust,then wipe off as much oil as you can with a clean rag.The rag should still look clean,and not pick up any dirt when you wipe the cylinder.
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Old 11-13-2012, 08:23 AM   #22 (permalink)
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Cheers mate! Very helpful indeed.

The rebore has been done already by a man who does triumphs all the time (and owns 9!) but ill ask anyway. I'll make sure everything is clean as well.

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Old 11-13-2012, 11:11 AM   #23 (permalink)
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the last t140 i built i used a pair of mid 60's bonnie cams,which ment a tamer inlet and a wilder exhaust than standard t140 both timed at 100' lobe centre ,it went really well lifting the front wheel off the throttle in first even with higher than standard gearing.i will use this combination in all my engines from now on.
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Old 11-14-2012, 12:14 AM   #24 (permalink)
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Have you tried t140 inlet with the 650 exhaust?

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Old 11-14-2012, 05:52 AM   #25 (permalink)
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yes thats what iv got in 1 of my 650s its ok but i feel it now lacks bottom end, i used to allways use 2 inlet cams in the t140s which gives you a pair of spitfire profiles and they go really well like this, but a bit top endish and not as nice to live with and a bit noisey.Everyone likes different set ups even as you get older your tastes change when i was 19 and had one top speed was the only consideration !But a pair of 650 cams in a t140 give good low end,110+ top speed ,economy and less strain on the valve gear.
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Old 11-14-2012, 03:59 PM   #26 (permalink)
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What do you do for the advance/retard unit etc if using two inlet cams?
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Old 11-15-2012, 04:38 AM   #27 (permalink)
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bore the end out and press a slug in then machine, or just buy one done,hyde used to sell them.if i was to do one now i would use my new favourate, electrex world flywheel ignition units does away with all the crap.
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Old 11-15-2012, 02:55 PM   #28 (permalink)
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Quote:
Originally Posted by 1963wak View Post
if i was to do one now i would use my new favourate, electrex world flywheel ignition units does away with all the crap.
Sounds interesting - any more info on this?
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Old 11-15-2012, 03:15 PM   #29 (permalink)
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http://www.electrexworld.co.uk/cgi-b...2D#aSTK_2d102D
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