10% off the Best Rotary Spark Plug
 

Sparkplugs.com is offering 10% off the NGK R7420's (also known as the Greddy Race Plugs) which are the best rotary spark plug imo. I saw this in the Vendor Classifieds so I thought I would share. You can search for them using these part numbers... Last numbers being the heat range.

R7420-9
R7420-10
R7420-105
R7420-11

PS - they also sell stock NGK plugs and the discount applies

thewird

Are these appropriate for daily drivers, or is it more of a "race plug" that would foul in a street car?

These are fine for a street car. They are very similar to the OEM RX-8 iridium plugs which go for 70,000 KM. I've gone on over 20,000km's on a set of these and thats with tons of track abuse and they were still technically fine but I like running new plugs so I changed them :). They provide a better spark and last longer. It's just a better plug.

thewird

I am so excited. Went to my local Partsource and ordered 4 NGK BUE's. A very cold plug for race use. Had them the next day and got all 4 for under $20 Cdn. including taxes. I will be testing them on the car next weekend at Shannonville and will let everybody know my results.

Man, I am pathetic when I get all excited about small stuff like this, LOL.

Eric

^ I'd be impressed if a set of those survives a race weekend. Keep us posted.

thewird

Just remember that this will be on a 1/2 bridge NA, not a turbo monster. A few guys on the NA Performance thread have been using them with decent results. In looking at the plugs, they look very much like the really old SD10's and SD11's from 300 years ago (or seems like it).

Will start the car on the existing plugs, then swap over to these for on track sessions. Fingers crossed to see if they work as well as the money savings and availability are great.

Eric

I'm worried about the copper core, its not going to last very long on a race motor, even if its N/A. It might make the power of a cold plug, but its not going to last as long imo.

thewird

Good point, but if I can get them to last 3 hours of track time, thats 2 weekends and thats good enough for me. Heck at this price, I can change them every day, LOL.

Well, we will check them out and see.

Eric

Do these require a thin walled socket to install and remove or are the of the same design as the stock plugs?

-Geoff

Same dimensions as stock plugs. No special socket needed.

thewird

I have a few sets of NGK Race plugs ( B9EGV and B10EGV ) if you would like to try a set Eric

Jim, let me try these and if they blister like the stock plugs or melt down or cold foul, then I will contact you to try yours. If they work fine, I will let everyone know. All I can say is that there is no porcelain section to speak of, so they should be pretty cold plugs. Just wonder about durability.

I just hate dropping a couple of hun on plugs and then not having them make a difference.

Thanks for the offer.

Eric

I must be missing something lol NGK is one of my sponsors and the only true race plugs Im aware of that are available are R6725 -105 and R6725-115. These plugs are not daily driver friendly at all. In the P.Port we start and warm up the car on NGK BUR9EQ plugs for leading and trailing then switch over to the race plugs once the car is warmed up. We can start it on the race plugs but they will start to fowl almost immediately.

I have a few of my old R7420 as well if you'd like to try as well. Want them back though ^_^

01Racing, I daily drive my 10 leading, 10.5 trailing. Starts in the winter too. :). There's also been a case where someone was running stock plugs (new) and ignition and I told them to get these plugs and/or a twin power as I thought his ignition wasn't adequate when I tuned it. He couldn't afford the twin power but got the plugs and said it made his car drive noticeably smoother, not a placebo.

Also, the R6725 are the older platinum design. Considering the plug cost is identical for the R7420, there is no reason to buy R6725 anymore as the R7420's last significantly longer unless thats all your sponsor will give you of course.

thewird

If you like you can just take them with you, they cost less then $10 a plug and will take race track abuse, i'v been using them for a few years now....I would never spend "a couple of num" on plug as well.....your's for the asking

"I must be missing something lol NGK is one of my sponsors and the only true race plugs Im aware of that are available are R6725 -105 and R6725-115. These plugs are not daily driver friendly at all. In the P.Port we start and warm up the car on NGK BUR9EQ plugs for leading and trailing then switch over to the race plugs once the car is warmed up. We can start it on the race plugs but they will start to fowl almost immediately."

Al, you know me. If I can find a way to skin the cat cheaper, I will. Go to the NA Performance Forum and read the thread on race plugs adding power. A couple of guys have run the BUE's on their street cars and they seem to be working. Cold startup and around town driving. As well, they are very cold and are monster cheap. Worth a try at least on a test day.

Jim, I would like to take you up on your offer as well. I would gladly take a set with me to try out. August 1st is really going to be a product test day for me. I want to try all the different types of plugs, I have to try 3 sets of brake pads out from a brake pad company that I am doing work with and then I have to take a bunch of tire data for a tire company I am involved with. I am also trying out a new oil that was sent to me from the States. It looks like a full day of on-track and wrenching. I may need to refill the tank about 3 times and I hope that I can handle all the lapping that day, LOL.

Jim, could you pm me with a contact number and we can set up a time to meet.

Eric
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I just spoke with NGK Canada and the R7420 are not available through NGK Canada which is why I dont have them lol. Our spark plugs are run for about 60 minutes of racing and then we move onto the next set......thats the big disadvantage to a carburetor and premixing oil. If we are in a low rpm situation (under 7,000 lol) then we are incredibly rich that what fouls our plugs.

Is there any place to get these plugs locally? Ideally I would like to have them next day....

Last time I ordered these race plugs I got them with Marco, and I believe they came from rhdjapan

Any help would be greatly appreciated.

We don't have them in Canada period, you must order from the states. I ordered 12 of them 2 weeks ago and already sold all of them LOL. JRP occasionally carries the Greddy race plugs which are the same plug but they're also not cheap from JRP. If you guys are interested, I can order another batch.

thewird

I will take another set. How quickly do they arrive?