Soot

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cannonball
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Post by cannonball » Mon May 27, 2019 1:52 pm

Friday was the first proper drive in the Scimitar covering around fifty miles and the to do list just got longer but overall i am quite impressed with the old beast especially it's ability to scoot round twisty sections of road. The biggest problem was a slight hesitance during light acceleration but I may well have found the problem as the vacuum hose between carb and distributor was hanging on by a whisker as it is too short. Plugs were checked to see how things were and all six more or less the same. Then a look up the tailpipes and both sides equally sooty. During the run I notices a couple of blue puffs of smoke when taking off from rest. Valve stem seals?
Your thoughts please gentlemen.
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David Tew
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Post by David Tew » Mon May 27, 2019 3:32 pm

Plugs look good so the overall mixture seems OK. I wouldn't worry about soot in the exhaust as the Weber doesn't give the most linear of mixtures across the rev range.

Blue smoke is oil burning but if it's just a little puff on acceleration it shouldn't be a problem. A good test is to drive down your local hill in gear with the throttle closed for a minute or so and then boot it. Look in the mirror as you do it and as long as you don't see huge clouds of blue smoke you should be OK.


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peter freeman
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Post by peter freeman » Mon May 27, 2019 4:12 pm

Valve seals I have found are normally the cause of smoke on tick over and when first starting and pulling away - piston rings normally cause smoke on engine over run ( downhill using he engine as a brake mainly ) Fun-illy enough the nearside tends to be smokier than the offside.



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Post by Oldconn » Mon May 27, 2019 6:57 pm

I wish my plugs looked as good as those!


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peter freeman
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Post by peter freeman » Mon May 27, 2019 7:24 pm

Soot never used to happen when we had leaded petrol



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Post by old bean » Tue May 28, 2019 12:05 am

Excess soot on the rim of plug hints at an over rich Idle setting.



cannonball
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Post by cannonball » Tue May 28, 2019 5:20 pm

Thanks guys, i have found another little thing requiring £'s spent so I will leave that little bit of darkness for another day.



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