Which spark plugs do you use for your 20B Cosmo?

[snurky]

It is about time to change the spark plugs of my 1992 - JCESE CCS Cosmo.
At present I use NGK BUR9EQ for Trailing and NGK BUR6EQ for leading.

Is this a configuration I should continue as it drives flawless with these; I went to a motor-show and
ended up in a parade which took an hour at idle-speed, which gave no complaints at all.

Or are there aftermarket solutions that you recommend?

Perhaps a poll: what spark plugs do you use?

The Cosmo in a proper line-up: 1-Rotor NSU Wankel Spider, 2-Rotor NSU Ro 80 and 3-Rotor Eunos Cosmo and 2-Rotor Mazda RX-7.

 

[Berty]

BUR9EQ and BUR7EQ for me.

 

[frank20bcosmo]

BUR9EQ and BUR7EQ for me.

I am running the same as Berty

 

[frank20bcosmo]

It is about time to change the spark plugs of my 1992 - JCESE CCS Cosmo.
At present I use NGK BUR9EQ for Trailing and NGK BUR6EQ for leading.

Is this a configuration I should continue as it drives flawless with these; I went to a motor-show and
ended up in a parade which took an hour at idle-speed, which gave no complaints at all.

Or are there aftermarket solutions that you recommend?

Perhaps a poll: what spark plugs do you use?

The Cosmo in a proper line-up: 1-Rotor NSU Wankel Spider, 2-Rotor NSU Ro 80 and 3-Rotor Eunos Cosmo and 2-Rotor Mazda RX-7.

I love the line up, great to see some of the rare and unusual Rotarys all together in the same place,,

Frank

 

[snurky]

Then you'll like these pictures as well:

 

[rodneooo]

BUR9EQ and BUR7EQ for me.

plus 1 for me and my 13b.
They are cheap, very good resistence to fouling, good for decent hp levels and u dont need a fancy socket to get them out like other plugs.

for standard to mildy modified i wouldnt look anywhere else.

I keep 2 sets of plugs on a rotation of about 3000kms or so.
once swapped i soak them in thinners and thouroghly clean with a wire brush and sand paper ready to swap over again.
i like to do this method because i tend to do alot of short trips ie in cold start mode more than id like.
i can usually get the same set through 3 rotations of 2500-4000kms, so close to 10,000kms. havent really bothered to try a forth run.

 

[snurky]

Thanks to you all for your replies.

How about the Platinum versions, BUR9EQP and BUR7EQP?

Anyone got any experience with these?

 

[cosmojc]

WOW Snurky, How rare is that Citroen! There is a bi-rotor in Aus still (allegedly) but hasnt been seen for a while now - Ausrotary has some pics of it

http://www.ausrotary.com/viewtopic.php?f=23&t=56148&p=1928768&hilit=citreon#p1928768

Interesting process with your plugs too Rod, I let em run for 5 and chuckem! I'd be interested in peoples comments on the Platinum as well.

Kramer

 

[rodneooo]

iv been told to stay away from platinum and iridium plugs in rotories. If i remember the explanation correctly its because the platinum or iridium tips are fixed onto the plug tip and may break off due the higher combustion pressure and temp of rotaries. whereas for ordinary plugs the tip is one piece and fixed deep inside the plug so no chance of breakage. dont quote me on that, i read that in ausrotory a while back.
But the way rotaries treat their plugs i wouldnt bother either way. theres no way the extra expense will outlast the x amounts of plugs u can buy for the same price. and there is no way they will last as long as ngk or whatever say they will.

 

[Berty]

I have been told the exact same thing about the bureqp plugs. I would just save your money and instead of buying the bureqp plugs, just buy the regular ones more frequently.

 

[cosmojc]

Darrin from Gosford Mazda reckons Platinum are ok, but not the iridium! I haven't even looked at the plugs in the FD! They were in it when I got it, and I've put almost 10k on that! I think they are Platinum!

Kramer

 

[AVENGE]

I use Bur7eq all round.

 

[snurky]

After an intensive search around the net I found the website of Mazdatrix with this usefull information page about almost all available rotary plugs.
The Cosmo is happy with its new plugs, and so am I: decent prices and perfect service: Thank you Mazdatrix!
And thanks to you all for your advise and information.

 

[snurky]

The owner of the gray Cosmo also owns the NSU Wankel Spider and NSU Ro 80 in the previous pictures. Recently this Citron Birotor was added to his collection:

And yes, the Citron M35 is rare:

No less than 15 (!) were recently offered for sale by a Dutch collector. It was intended to sell the 15 cars as one lot,
but they are now seperately available.