Need help with the right spark plugs for my 79 rx7.
02-15-15, 09:20 PM
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Need help with the right spark plugs for my 79 rx7.
Hi some of you might remember me i have been away for awhile i have just started working on my 79 rx7 this week i am installing the spark plugs and wires right now but something is bothering me if i got the right plugs it is a stock engine the old spark plugs in the car were NGK BUR9EQ for all four plugs and i bought NGK wire set and i bought BR7ET spark plugs which the ngk website says is the right plugs for my car. But i have read on here that your are suppose to have two sets of different kind of plugs 2 leading and 2 trailing. I will be driving the car in the city stop and go traffic and some highway use please help me thank you.
02-15-15, 09:52 PM
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Also on the wires i am not 100% i put them on right there were numbered 1 and 2 but i didn't know which one goes to the leading and which one to the trailing i put the longer wires for trailing and the shorter ones on leading is that correct thank you.
02-15-15, 09:58 PM
#3
Here is a link that may help:
https://www.mazdatrix.com/ign-2.htm
Sounds like you've got the right ones, The BUR9EQ are 2nd gen plugs.
I believe the wires labeled 1 are the front rotor and 2 is the rear. Go by the labels on the distributor cap for trailing or leading.
https://www.mazdatrix.com/ign-2.htm
Sounds like you've got the right ones, The BUR9EQ are 2nd gen plugs.
I believe the wires labeled 1 are the front rotor and 2 is the rear. Go by the labels on the distributor cap for trailing or leading.
02-16-15, 10:13 AM
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Mazda has generally updated the spark plugs with the ignition.
the stock 79-80 (and older), use the BR7ET plugs, its a 3 electrode plug.
in 1981 when the electronic ignition came out they went to a 4 ground plug, BR8EQ-14, which should be used if you updated to the electronic ignition.
in 86 the FC introduced the BUR7EQ/BUR9EQ style plug, which is used in 2 heat ranges.
in 1992 the FD has these in platinum BUR7EQP/BUR9EQP
in 2003 the Rx8 introduces another plug design, it is basically the race plug, in a street heat range. RE7CL and RE9CL. these also work well in the distributor ignition system. they are an upgrade from everything previous. they are expensive, but they will actually last a very long time
the racing plug, is like the Rx8 plug, a single electrode, and comes in heat ranges that are much colder than stock R6725-10/10.5/11
with NGK, the larger the number the colder the plug. and the harder you use the car the colder the plug. a lot of the plugs are available in different heat ranges, the FC and newer plugs come in 6,7,8,9, and then the race plugs are 10, 10.5, 11 and they used to have 13's
the stock 79-80 (and older), use the BR7ET plugs, its a 3 electrode plug.
in 1981 when the electronic ignition came out they went to a 4 ground plug, BR8EQ-14, which should be used if you updated to the electronic ignition.
in 86 the FC introduced the BUR7EQ/BUR9EQ style plug, which is used in 2 heat ranges.
in 1992 the FD has these in platinum BUR7EQP/BUR9EQP
in 2003 the Rx8 introduces another plug design, it is basically the race plug, in a street heat range. RE7CL and RE9CL. these also work well in the distributor ignition system. they are an upgrade from everything previous. they are expensive, but they will actually last a very long time
the racing plug, is like the Rx8 plug, a single electrode, and comes in heat ranges that are much colder than stock R6725-10/10.5/11
with NGK, the larger the number the colder the plug. and the harder you use the car the colder the plug. a lot of the plugs are available in different heat ranges, the FC and newer plugs come in 6,7,8,9, and then the race plugs are 10, 10.5, 11 and they used to have 13's
02-16-15, 10:15 AM
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for the wires, the 1 and 2 refer to the rotor. then you just match L1 on the cap with the front rotor (#1), Leading, or Lower plug. T1 is the Top or Trailing. piece of cake
02-16-15, 11:10 AM
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You can use plugs with different heat ranges (BR7ET vs BR8ET for example) if you need to based on your plug fouling. There is no advantage to using plugs for different years unless you have the ignition system for that year installed on your car.
The marks on the cap will be L, T, L1, T1, L2, T2. The L and T to the their respective coil and with the wires that have the black insulation since you have NGK wires. The others go to their respective plug as others have stated.
In the future, the easiest way to replace wires on any car is to lay the new wires out longest to shortest then remove one old wire, match the length to a new wire, then replace.
If you need a picture for reference let me know.
The marks on the cap will be L, T, L1, T1, L2, T2. The L and T to the their respective coil and with the wires that have the black insulation since you have NGK wires. The others go to their respective plug as others have stated.
In the future, the easiest way to replace wires on any car is to lay the new wires out longest to shortest then remove one old wire, match the length to a new wire, then replace.
If you need a picture for reference let me know.
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