16
AC Weller Engine / Re: Spark plugs
« on: September 13, 2019, 19:44:46 »
Here it is Robin, so, post war isn't it?
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17
AC Weller Engine / Re: Spark plugs
« on: September 12, 2019, 14:06:03 »Yes, 18mm thread. Engine number is UMB 6 1/2 646, as far as I can see the last "pre-war" AC engine. I presumed that pre-war heads used 18mm threads as I'm sure 615 also has 18mm threads. I believe some owners fit adapters to reduce the threads to 14mm.
In fact, I suspect my engine marked UMB 386 would be a post war one as the plugs are 14 mm and the bolt securing the front pulley is left hand threaded...
18
AC Weller Engine / Re: Spark plugs
« on: September 11, 2019, 22:50:27 »
Thank you Keith for all those informations. My head has 14 mm plug threads.
Unfortunately, the plugs are not anymore my main concern with my engine…
Unfortunately, the plugs are not anymore my main concern with my engine…
19
AC Weller Engine / Re: Spark plugs
« on: September 10, 2019, 12:22:18 »
Thank you for your answer AC Ace Bristol, but my engine is an AC, not a Bristol...
20
AC Weller Engine / Re: Spark plugs
« on: September 10, 2019, 12:20:11 »A bit of a late reply, but I'm using Champion D9, which seem to work well. I was previously using NGK AB-6, which didn't like a combination of hot weather and stale petrol.
Thank you for your reply but don't D9s have a 18mm thread?
My cylinder head has 14mm threads, maybe 18mm were on older ones?
21
AC Weller Engine / Re: Spark plugs
« on: June 24, 2019, 14:53:01 »
Thank you very much Flyinghorse for your kind answer.
The link you provided seems very interesting to me as many other important points are also detailed.
I will try Champion L86C which is equivalent to NGK B5 and let you know the result.
I am not sure iridium plugs would be of great help but I will try the 0.025" gap you suggest.
Thank you for your help
Michel
The link you provided seems very interesting to me as many other important points are also detailed.
I will try Champion L86C which is equivalent to NGK B5 and let you know the result.
I am not sure iridium plugs would be of great help but I will try the 0.025" gap you suggest.
Thank you for your help
Michel
22
AC Weller Engine / Re: Spark plugs
« on: June 22, 2019, 23:05:51 »
Hello again,
So, nobody here has plugs on his AC engine and can help with advise about them???
So, nobody here has plugs on his AC engine and can help with advise about them???
23
AC Weller Engine / Spark plugs
« on: June 17, 2019, 12:56:49 »
Hello, I thank you for admission on this interesting forum.
I recently bought a 1936 AC 16/80 and am wondering if the sparks plugs fitted are the correct type.
Those are NGKs B6HS and tend to get wet quite often.
I think of fitting slightly hotter ones like NGKs B5HS or equivalent Champions L86C but would of course avoid the risk of damaging pistons…
Can someone give me an advise about this please?
I recently bought a 1936 AC 16/80 and am wondering if the sparks plugs fitted are the correct type.
Those are NGKs B6HS and tend to get wet quite often.
I think of fitting slightly hotter ones like NGKs B5HS or equivalent Champions L86C but would of course avoid the risk of damaging pistons…
Can someone give me an advise about this please?
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