Greg,
The article in Grassroots Motorsports suggests that with higher compression
and a hotter spark/larger gap (Gary's dizzy?) you may have to retard the
timing a degree or two. Did you try that?
I am waiting for an answer from NGK. After reading their website, I thought
I would ask what sparkplug they would recommend for a modified application
with .055" gap.
Daryl
'66 1800cc R16/G15
>From: <gregs672liter@netzero.net>
>The other day I came across a set of new NGK BPR7ES plugs I had bought
(one step colder than the 6ES). I noted that they have an extended nose. I
>have always run BR6ES plugs, which are not extended. The NGK site calls
for a BPR (extended nose) plug for the Roadster. To make a long story
short, >I installed the extended nose plugs and the car would knock at 3500
rpms under moderate to hard acceleration. Switching back to the BR plugs
stopped >the knock. Soooo, if any of you out there are running higher
compression and/or are experiencing some k!
> nock, you might try the BR6ES plugs instead. Don't know why it makes a
> difference, but it does in my car.
> Greg Burrows
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