curious about my plugs... ignore the threads as that is just lube... and a dab of that smeared on the edge (left lip area) of the top too. but the color may be slightly right no?
This is on my green mini.... These were pulled after approximately 7500miles - which has had some dieseling or run on issues... so recently i pulled these plugs "BP6ES" gapped at .023 and replaced them with BP7ES gapped at .026 - and don't notice any difference of performance really, it seems to run-on/diesel much less... And NO, i don't just let it diesel when i shut off the car, i am told the best thing to do is rev the car up real good to around 3k or so and turn key off quickly and then press the gas pedal to the floor to open the throttle to allow all air to come in and flush out fuel... works 100% of the time to shut off engine clean and no diesel or run on. (although i get looks from people around me thinking i'm trying to show off the sound of my exhaust, better that then them hearing my mini run-on and knock)
I'm thinking maybe the colder plugs might reduce dieseling run on...
Also i'm curious if my HIF38 should be adjusted just a hair to get a slightly leaner mixture.
My engine is a Pre-A block cooper 998, TAM2052 flat top pistons, mild cam of some sort, 12g295 head, Pertronix Ignitor elec ignition, Lucas Sports Coil, HIF38 carb, AAM needle, ITG sock filter and billet stub stack (sold at 7ent) . If i remember correctly the cars compression ratio is around 10.5:1 from what i was told. Car seems to run good, but wonder what others may suggest. I used to run a HIF44 and quickly pulled that and put in an HIF38 with an AAU or AAA (about 200+ miles) (cant remember, and can't seem to find the needle in my spares) Anyways, it ran better then the HIF44, but overall poor with the other needle until i decided to try the AAM needle... a major improvement in torque and overall power...ran it this way for about 7000+ miles. I thought the spark plugs should be slightly lighter brown then the photo above? (note:these plugs havent been changed for around 4-5 years)
i found this interesting article:
http://www.4secondsflat.com/Spark_plug_reading.html
and also this
http://www.dansmc.com/spark_plugs/sp...s_catalog.html
Is there a local shop that can accurately tune an SU carb for the rull range of RPMS and keep the A/F ratio correct along the full range. Anybody that actually specialize in this?
Comparing them to my SPI mini, well the SPI mini plugs are damn near perfect looking comparing it to the charts. Would like to get the optimum performance out of my Carb Mini too..

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