Hi Randall,
Thanks for the reply. Makes sense.
Here's another curious note. The manuals describe multiple plugs (all Lodge
#'s) depending on the condition of the engine (stock, race modified, etc.).
Are the Bosch, Champion, NGK plugs we've been discussing here covering
these conditions (or heat ranges?), or is there an equivalent for each of
the Lodge #'s?
Or, let me ask a different way. Is there a cross reference chart showing
hotter/colder plugs, possibly by brand? Spending $10 or so trying to find
a better plug may be worth the money, but I need to know what model numbers
to go after.
One last note. When running the Lucas Sport coil, the spark should be
hotter (more voltage, meaning bigger spark). Does that mean you can could
spread the plug gap wider (maybe to .030) to obtain a bigger (better?)
spark? It seems like there needs to be a balance between the coil and the
plugs (and wires) based on the condition and tuning of your engine. Bigger
(or hotter) may not be better.
Thanks
John in San Diego
'67 TR4A - tops been down for 3 weeks solid now!
On Tuesday, May 28, 2002 10:20 AM, Randall Young
[SMTP:ryoung@navcomtech.com] wrote:
> > Are the Bosch Platinum's better? How? And, what is the Bosch PN?
>
> John, IMO plug fouling has more to do with engine condition and state of
> tune (also fuel being burnt) than it does with plug construction.
(Assuming
> of course that the plugs are the proper heat range for you engine, it's
> state of tune, and how you drive it.) However, the platinum plugs seem
to
> be a little more forgiving as to heat range, and they also seem to last
> longer.
>
> I use Bosch WR7BP in my TR3A, mostly because Ken Gillanders at BFE once
> wrote that he measured a power increase on the dyno, just by switching to
> the WR7BP. I can't vouch for that, I've never noticed the difference,
but
> they do stand up much better to the MSD 6A ignition I used to run (and
will
> again).
>
> A set of 4 WR7BP is listed as Bosch P/N 4232, this number seems to be a
bit
> easier to find in the stores. But, don't expect Kragen or Pep Boys to
have
> them. Clark's Discount Auto in Bellflower has them on the shelf more
often
> than not, but they do seem to be a slow moving item. Judging by the dust
on
> the last set I bought, I may be their only customer for these !
>
> Randall Young
> 59 TR3A TS39781LO daily driver (currently sidelined for OD transplant)
> 63 Sports 6 HB7826LCV rustoration project
> 71 Stag LE1473L daily driver (Real Soon Now)
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