Hi Dave,
The last seminar on Saturday was by Hal Kramer, discussing sparkplugs.
Having reviewed theory, he got into practice, with discussion of current
fuels and sparkplugs. In summary, he said--use 87 octane since the old
measurement differs from today's.
Set timing about 5' ahead of the book's recommendation--I worked this out
on the crank pulley Sunday night--32 original advance + 5 = 37 which is a
tiny bit larger than 1 3/16 inches on the crank pulley. Mark with liquid
paper on the pulley and set with timing light. Set plug gap at what the
spark plug maker recommends.
He's finding best results currently with NGK plugs. Says they have a
closer gradation of temp ranges than others on the market today, the
higher # being the Colder (unlike Champion) He recommended that one
start with a B6HS, or BR6HS for a resistor plug (these are the 1/2"
plugs) They have the 3/4" also, but I forgot the letter designator. He
said that N9Y has been superceded by L82C if I recall correctly.
Another factor he mentioned, just to complicate things, is that
today's RFG or whatever they now call what used to be called gasoline has
different burn characteristics. Example-if using a Colortune, one must
set the mix so that RFG burns orange with a hint of blue, not the blue
that Colortune recommends. Apparently TDs need a richer mixture when
running on this stuff.
Good luck on this; please share with me what you determined as I am
going through the same ignition experiments myself.
Bob Howard
On Tue, 01 Jul 1997 18:03:52 +0000 Dave Houser <mgs4dave@warwick.net>
writes:
>Just got back this weekend from the T-register meet up in Boston and a
>couple of questions came up without answers, so I come to this learned
>group of MG savvyists.
>1- We must have covered sparkplugs before but maybe not the modern day
>types now available(Is there a FAQ?). I've been running Champion
>N-9Y's
>since I've got 1/8" off the head, .040 overbore, 1-1/2" SU's, GJ
>needles, twin fuel pumps(ala MK. II TD), 4.3 MGA rear. I think I
>should
>be using a colder plug and want any recommendations you can offer. Old
>plugs look rich, with black deposits and white crud on top of
>electrode
>after a run back from Boston(200+ miles). Tail pipe pretty black,
>starts
>with very little choke, if any at all, jets all the way UP!
>2- I've got a knock over rough roads that is from the inner steering
>ball joint. If you push the headlight bracket down, it clunks(thought
>it
>was a worn sway bar bush). Any ideas on what to do there? Fill it with
>grease to help quiet it down?
>
>Thanks in advance,
>Dave Houser
>
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