just popped out the plugs the other day, and they were fugly! what plug(ngk of course) is best for stop and go. the longest my car is usually on is about 10 mins. lots of low speed stuff, heck its a small town! i do get it on the highway for about a mile on the way to work, but its not heating up enough to burn off the crud.

 

Tell us what year of car you have.

 

s'pose that would be helpful.... 82 gsl, with an 84-85 12a, and if it makes a difference, headers, exh, (its crappy, it's awful, it's pacesetter!) hi voltage coils(40k volts), dellorto 48 sidedraft carb, and hopefully(depending on my wallet) soon to have dual direct fire ign.

 

That dellorto is what's causing the rich running condition. You are running rich right? Just make sure that the air filter is plenty clean and do hook up a dual firing Leading plug ignition system Like DLIDFIS (stay away from MSD, especialy if you're running rich).

Are you using BR8EQ-14? You probably wont find BR7EQ-14 (7 is hotter than 8) unless you have "connections" or something. Hmm, does anybody know if BUR7EQ and BUR9EQ will work on a 1st gen engine?

Perhaps there is a way to lean the carb a bit? I have no idea if it's possible because I've see what a dellorto can do to plugs even after it was supposedly tuned properly. My guess is that the dellorto flows well on a 6 port engine, but not so well on a stock ported 4 port engine.

 

What's the difference between BR9-EQ14 and BUR9EQ?

 

yeah, its running a bit rich. at least i think it is cuz my nice yellow exh. tips are now black. i've yet to figure out the proper jetting. i've been fiddling with it here and there, and i've got a couple other diff jets, but until i get an A/F meter hooked up, i'm basically trying to shoot a housefly in the dark with my eyes closed. it doesn't help that this is the first carb i've ever messed with! air cleaner is brand new(k&n), couple months worth of driving on it, and i've been having screwy fuel pump relay problems that i'm just now figuring out... i hope. now that i think of it, an MMO treatment should be in order, right? i mean, if the plugs were looking like that, the combustion chamber's probably pretty fugly too.

 

Try and hit the redline once in a while. It'll take all that nice carbon out

 

you're kidding, right? i hit redline darn near every time i change gears! doesn't everyone with an RX-7 do that? just hold the gas till the little buzzer tells you to shift? :p
i'm fairly certain i'm running 8's for plugs now(possibly even 9's, but i think 8's, i'm at work so i can't look)
the dellorto came off my old SE.... and it was FAST! it had the world's crappiest exhaust, but quick nonetheless. imagine having a ported 13b, a big honkin' dellorto tuned perfectly(for that engine at least), and headers feeding into a single 1.5" pipe, followed by a cat, then a glass pack , then a cheezeball muffler. yeah, i had some hidden ponies in there.... to bad i spent all i had to get the car and never could afford to replace the exh. it originally had a full RB setup, twin pipes w/ presilencers... it was on when i test drove the car. but the guy was afraid to sell it w/o a cat. even tho we didn't have emission checks and no one would ever know.

 

Jet the carb correctly. Then play with plugs.
Wait till you get to 170*F before you go flooring it all over the place.

 

My friend had a very similar problem. His old style 4 port 13B had a dellorto on it and ran extremely rich. Then he switched to a stock carb and the plugs started having the nice brown look color on them. Even his exhaust tips stopped looking so black inside.

He plans on using the dellorto again, now that we've upgrade his ignition. It will be interesting to see if the rich problem returns.

 

telling me to just jet the carb correctly is like handing me a scalpel and saying'its just open heart surgery, go on'. the most i've ever done to a carb is shoot cleaner down it. but i'm slowly edumacating myself. and without the A/F meter on there, i can only guess as to what i'm changing. got one on order, so maybe i'll get it sorted out soon. i also wait till my temp gauge reaches normal before i exceed 4k rpm. one learns a lot on this site baby it when its cold, run the snot out of it when its warm, never, never, ever feed it after midnight... uhhhh, i mean never let it get hot.
i figured different plugs would be a good idea because the car only runs 10mins at a time on avg. and she rarely gets a good highway workout. back in florida, i drove the interstate to work for 20 mins, and my plugs always looked purdy. but the stop and go isn't helping with the rich carb and dirty plugs. i'd thought a hotter plug may be in order.
the DLIDFIS setup sounded like a step in the right direction for me. too much fuel? burn it off! i'd really like to squeak a couple more ponies out of that carb... i know they're hiding in there. speaking of DLIDFIS, is it better to have stock leading coils, or are higher voltage coils ok? i've got a couple 40k coils now, and still have my 2 stocks(stockers are cheap anyway) and was curious which i should use.

 

If you have high performance coils use em. I'm using MSD Blasters for the leading and a stocko on the trailing side.

 

Yep, REVHED is right. Just make sure the coils you're gonna use have similar resistance to stockers, otherwise you'll burn up your ignitors. I using stock Diamond coils.

 

similar resistance? ummm... how do i check that? i've had these on for 1 1/2 years, they're accel i do believe. all i know is they looked identical to the stockers other than being yellow and black. anyone have any idea if the accels are a direct replacement, or are my ignitors going to leave this world soon?