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+--- Thread: Spark plug help (/showthread.php?tid=1739)
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Spark plug help - Mel Ruffner - 08-27-2017
Hi everyone. Was wondering what spark plug I should use for a early Mac motor .
RE: Spark plug help - Romero Llamas - 08-27-2017
Autolite 353 for the short reach round head.
Autolite 411 for the later Mc91 square heads.
RE: Spark plug help - Mel Ruffner - 08-27-2017
Romero is that for gas or alky?
RE: Spark plug help - steve miller - 08-27-2017
im pretty sure be safe with NGK plug B8S short
B8ES ..like 91,s etc..
work good for either gas or Alky ..
RE: Spark plug help - ted johnson - 08-27-2017
The letter before the "S" is the reach. "H" means a 1/2" reach, no letter means a 3/8" reach. The "E" means 19.0 mm, and those are TOO LONG for any Mac kart engine. The "S" means copper core center electrode. For an early Mac with 3/8" reach, the B7S for gas, and the B8S or B9S for alcohol. On a newer 1/2" reach head like the later 91's or 101's, and for West Bend 610 or 820, B7HS for gas, B8HS or B9HS for alky. I've been running B9HS on modified alky engines for ten years. They are very long lasting and perform great. I don't know how Chuck Giacobbe's stocks are holding out, but I buy NGK's from him. He has good prices. Ted
RE: Spark plug help - steve miller - 08-27-2017
thanks ted... I never can remember exactly ..
but I do know a 7 pretty hot ..Id run 9s for gas 8,s for alky ..ngk lower number hotter plug ..I think 9 to cold for alky
I run champions ..Lol..
RE: Spark plug help - Romero Llamas - 08-27-2017
Those are the plugs I use on alky Mel. I have also used the NGK plugs mentioned.
Romero
RE: Spark plug help - Mel Ruffner - 08-27-2017
So what champion plug for Mc 5 running gas. Thanks everyone
RE: Spark plug help - David Luciani - 08-28-2017
(08-27-2017, 09:43 PM)Mel Ruffner Wrote: So what champion plug for Mc 5 running gas. Thanks everyonei'd just use the ngk's but heres a cross reference link mel.
that link lists the most common plugs in usa available
njk bs8 cross reference chart
if you want to change the search use this line in search window but change which plug.
ngk b8s to champion
so you'd switch ngk b8s to ngk b9s or ngk b7s
hope this helps
RE: Spark plug help - Terry Sullivan - 08-28-2017
I run Champions, like they did back in the day.
J6c
J8c