Has anyone tried these? They're shown as a sponsor of RX7 City, but you go to the website and they don't have any for RX7s. It seems that anything that would assist combustion would be especially good in a rotary engine. I'm willing to pay the extra money, I'm just not sure which ones I could use.

 

The rotary engine uses a special design of plug so that they can operate at the high temperatures of the engine while getting combustion to begin in the most advantageous positions in the working chamber. If they don't show special plugs for RX-7s, then there's nothing you can use. As far as I know they only sell conventional plugs, which have a side electrode that is curved over the centre electrode. RXs use a surface gap design with multiple side electrodes around the centre electrode. This gives a flat top to the plugs and thus keeps them from being hit by apex seals passing over them, which is clearly a big deal.



Since Mazda and a few OEM suppliers (like NGK) are the few companies making rotary parts, stock is often best.

 

Racing Beat, among others, sell non-Oem spark plugs. There must be some way to calculate which plug would be usable.

 

i believe you are misunderstanding the post. last time i check RB sold NGK plugs in different TEMPeratures then stock but they are the same design of course. There is an entirely DIFFERENT design between a rotary plug and conventional plug. Go to sparkplugs.com and compare by scrolling over various plugs and compare those to the rx7 plug. You absolutely Cannot use a non - re plug in an re engine. There is nothing to figure out. It wont work.

 

There have been a few gimmicky "NEW" plug designs to hit the market. Tests consistently show that they have nothing to offer. A new set of stock NGK's is going to give you the best possible performance.

 

No. I understood. I looked at the pictures and Racing Beat sells the plugs you describe, but it also sells conventional plugs. There's a long dissertation about choosing temperature etc. How does one apply that to the Pulstar plug?

 

Clearly you didn't understand. Racing Beat only sells conventional plugs for cars that use conventional engines. They deal with Mazdas, so if someone needs plugs for a Miata, they carry them. Temperature has nothing to do with pulstar plugs though because pulstar doesn't make rotary spark plugs. Everything comes in one flavour: piston engine, single-side electrode plugs. No pistons, no pulstar.

 

Ignore the "clearly you didn't understand" part. Apparently I was just in a damned shitty mood at 1:56pm today :P

 

Wrong. Many people use standard plugs in a rotary instead of the surface gap plugs that come stock. Its especially common with drag racers and other high boost engines. The Bx-EGV plugs are a common fitment for rotaries. x is the heat range, I ran B11-EGV in my 10k rpm streetport engine.

 

This is absolutely wrong. See above ^