tired of these iridium and old style sparkplugs!
02-12-2010, 11:41 AM
#1
tired of these iridium and old style sparkplugs!
Sparkplugs for our engine has always been a sore spot for me. The dang ngk's just cost to dang much---even at $80 a set ----Jeez ---come on!!! And they do not last long. My understanding is that iridiums were orginally made to get that 100K engine without a tune up for regular cars. It actually has a low electrial conductivity but it does wear very well.
The flat top old style plugs just dont run as well for me ---i have tried them and I did not like them. Yes they were correctly sized and washered.
Has ANYONE tried anything else? I am looking at some Brisk silver wire types and would get some right now but they only have a 19 mm reach and I really dont know how far the non protruded tip goes into the combustion chamber? They are only about 10 bucks apiece. Nology also has some silver sparkplugs with the same specs. they also have a 25 mm reach plug that maybe could be shimmed?.
Hell-- i would take copper also if i can find any that fit.
Size is a 14 mm thread, reach is 21 for the Leading and 19 for the trailing, and a hex(really not important for us) is a 13/16 and yes I do want a resistor type. Non protruding tip is also needed?
OD
The flat top old style plugs just dont run as well for me ---i have tried them and I did not like them. Yes they were correctly sized and washered.
Has ANYONE tried anything else? I am looking at some Brisk silver wire types and would get some right now but they only have a 19 mm reach and I really dont know how far the non protruded tip goes into the combustion chamber? They are only about 10 bucks apiece. Nology also has some silver sparkplugs with the same specs. they also have a 25 mm reach plug that maybe could be shimmed?.
Hell-- i would take copper also if i can find any that fit.
Size is a 14 mm thread, reach is 21 for the Leading and 19 for the trailing, and a hex(really not important for us) is a 13/16 and yes I do want a resistor type. Non protruding tip is also needed?
OD
02-12-2010, 12:00 PM
#2
Sparkplugs for our engine has always been a sore spot for me. The dang ngk's just cost to dang much---even at $80 a set ----Jeez ---come on!!! And they do not last long. My understanding is that iridiums were orginally made to get that 100K engine without a tune up for regular cars. It actually has a low electrial conductivity but it does wear very well.
The flat top old style plugs just dont run as well for me ---i have tried them and I did not like them. Yes they were correctly sized and washered.
Has ANYONE tried anything else? I am looking at some Brisk silver wire types and would get some right now but they only have a 19 mm reach and I really dont know how far the non protruded tip goes into the combustion chamber? They are only about 10 bucks apiece. Nology also has some silver sparkplugs with the same specs. they also have a 25 mm reach plug that maybe could be shimmed?.
Hell-- i would take copper also if i can find any that fit.
Size is a 14 mm thread, reach is 21 for the Leading and 19 for the trailing, and a hex(really not important for us) is a 13/16 and yes I do want a resistor type. Non protruding tip is also needed?
OD
The flat top old style plugs just dont run as well for me ---i have tried them and I did not like them. Yes they were correctly sized and washered.
Has ANYONE tried anything else? I am looking at some Brisk silver wire types and would get some right now but they only have a 19 mm reach and I really dont know how far the non protruded tip goes into the combustion chamber? They are only about 10 bucks apiece. Nology also has some silver sparkplugs with the same specs. they also have a 25 mm reach plug that maybe could be shimmed?.
Hell-- i would take copper also if i can find any that fit.
Size is a 14 mm thread, reach is 21 for the Leading and 19 for the trailing, and a hex(really not important for us) is a 13/16 and yes I do want a resistor type. Non protruding tip is also needed?
OD
Paul.
02-12-2010, 12:04 PM
#3
SARX Legend
iTrader: (46)
I too have wondered what makes them so expensive. My main issue is if they are worth the huge expense (for spark plug I mean) or if they are just poking us because they are specific to our engine.
02-12-2010, 12:08 PM
#4
Original Turbo 'd Auto !!
02-12-2010, 01:12 PM
#6
i havent tried that combination. The flat top plugs ran ok but just seemed to not have as much gas milage or low end grunt. (this was before i was running the twin fire). Just felt different. I do have short drives at times.
I am running now the one step colder Denso's for both leading and training.
They work fine. I just know that once a year I usually need to change the plugs.
I, like MM, really dont trust the itty bitty grounding strap on the ngks as i do regap them.
Also since I am fi and dont have the ability to redo the coils dwell., i run the twin fire on the oem coils. (which some tell me doesnt do a dang thing and others tell me it does?)
Now I am not having any problems with my system but if I can get a better conductive plug for a cheaper price, that has a stronger grounding strap, and comes in much wider hot/cold heat ranges then I should go for it?
I am thinking about trying the Brisk silver plug with the 19mm reach and running without a washer,but i really need to see the plugs tip protrusion before I try this?
They do make one that has the correct thread, heat range and has a 19mm reach. It has a non protruding tip and a tapered seat.
What do yall think? Paul?
OD
It would be nice to have a track set of plugs and a street set. If fact its beyound nice---its needed?
I am running now the one step colder Denso's for both leading and training.
They work fine. I just know that once a year I usually need to change the plugs.
I, like MM, really dont trust the itty bitty grounding strap on the ngks as i do regap them.
Also since I am fi and dont have the ability to redo the coils dwell., i run the twin fire on the oem coils. (which some tell me doesnt do a dang thing and others tell me it does?)
Now I am not having any problems with my system but if I can get a better conductive plug for a cheaper price, that has a stronger grounding strap, and comes in much wider hot/cold heat ranges then I should go for it?
I am thinking about trying the Brisk silver plug with the 19mm reach and running without a washer,but i really need to see the plugs tip protrusion before I try this?
They do make one that has the correct thread, heat range and has a 19mm reach. It has a non protruding tip and a tapered seat.
What do yall think? Paul?
OD
It would be nice to have a track set of plugs and a street set. If fact its beyound nice---its needed?
02-12-2010, 01:43 PM
#7
Once a year isn't so bad.
I change mine every couple of months. FI destroys the center electrode.
I do worry about the protruding electrode on the trailing - I did lose a motor to a mystery solid object intrusion and was never able to verify that it wasn't the plug (it definitely wasn't a seal).
The 19mm depth thing should not be underestimated.
Some people that have "investigated" the plug depth issue have not taken into account that "shoulder" depth isn't the issue, rather the "bowl" at the face of the housing isn't square.
A seemingly proper depth plug at 21mm will smash into this bowl and distort the housing.
I change mine every couple of months. FI destroys the center electrode.
I do worry about the protruding electrode on the trailing - I did lose a motor to a mystery solid object intrusion and was never able to verify that it wasn't the plug (it definitely wasn't a seal).
The 19mm depth thing should not be underestimated.
Some people that have "investigated" the plug depth issue have not taken into account that "shoulder" depth isn't the issue, rather the "bowl" at the face of the housing isn't square.
A seemingly proper depth plug at 21mm will smash into this bowl and distort the housing.
02-12-2010, 02:26 PM
#8
Gremlins are not a stranger here either. Loosing a motor like that sucks--really sucks.
Yep-- I know about the bowl requirements on the trailing-- i plan on running oem there--like you and keeping them fresh. If I can find a something a little more sturdy and compatable Ok then, but i am looking at the leading 1st. Not ignoring the trailing as really that plug is more susceptable to detonation?
I can get a cheap plug with the same measuements and features to check the tip protrusion , seat etc
Another project
OD
OD.
Yep-- I know about the bowl requirements on the trailing-- i plan on running oem there--like you and keeping them fresh. If I can find a something a little more sturdy and compatable Ok then, but i am looking at the leading 1st. Not ignoring the trailing as really that plug is more susceptable to detonation?
I can get a cheap plug with the same measuements and features to check the tip protrusion , seat etc
Another project
OD
OD.
02-12-2010, 02:52 PM
#10
a) Why is this in the S2 forum? Last I knew you had an S1.
b) An $80 annual plug change when you're running a supercharger on an engine that was originally NA doesn't strike me as extreme. Just be glad you're not running the NGK rotary racing plugs that are 2x+ what the OE plugs are, though that's probably what you should be using on a tracked FI rotary application. I suspect this is where Paul was going.
b) An $80 annual plug change when you're running a supercharger on an engine that was originally NA doesn't strike me as extreme. Just be glad you're not running the NGK rotary racing plugs that are 2x+ what the OE plugs are, though that's probably what you should be using on a tracked FI rotary application. I suspect this is where Paul was going.
02-12-2010, 04:51 PM
#11
i hit the wrong button when i posted the thread- i am a idiot.
I have seen those $70 plugs but i dont think i am extreme enough to justify those.
My redline is a self imposed 7.5K and temps are good. The w/m also helps with the charge temps---so basically all i need is a little colder plug and i do ok.
My point, is that there are very few choices out there and the ones available (excluding the flatheads) are expensive.
The $80 bucks a year is for a regular set of rx8 plugs--mine are just a little more.
I much rather pay $50 for a set.
OD
I have seen those $70 plugs but i dont think i am extreme enough to justify those.
My redline is a self imposed 7.5K and temps are good. The w/m also helps with the charge temps---so basically all i need is a little colder plug and i do ok.
My point, is that there are very few choices out there and the ones available (excluding the flatheads) are expensive.
The $80 bucks a year is for a regular set of rx8 plugs--mine are just a little more.
I much rather pay $50 for a set.
OD
02-12-2010, 09:00 PM
#15
Anyhoo , I use the very cheap BUR9EQPs all around and like MM says the tips erode very quickly .
However I have recently realised that the trailing plugs don't do this , so when I replace the plugs I'll do the the leading only the first time then both the second time etc etc .
02-12-2010, 09:31 PM
#16
Denso!
I found two members that claim they're good. One tracked.
Made several inquiries. Butt know one has really posted a good thread on their use.
Feel free to do a search..
I had to send PM's to get confirmation that Denso's work good.
I found two members that claim they're good. One tracked.
Made several inquiries. Butt know one has really posted a good thread on their use.
Feel free to do a search..
I had to send PM's to get confirmation that Denso's work good.
02-12-2010, 09:57 PM
#17
Have you tired this?
For competition, the NGK R6725-10.5 or 11.0 make a couple of more horsepower, but are too cold for street use except in boosted engines (where they perform very well). Gaps on these plugs should be approximately .032" to .035".
For competition, the NGK R6725-10.5 or 11.0 make a couple of more horsepower, but are too cold for street use except in boosted engines (where they perform very well). Gaps on these plugs should be approximately .032" to .035".
02-12-2010, 10:46 PM
#18
These were what I was referring to earlier. Not as expensive as I had remembered, also available 11.5
Originally Posted by Mazda Motorsports
NGK R6725-105 Racing plugs. Recommended for all rotary engines used in racing applications. Use with thinner spark plug washer to move flash point closer and increase power, 0000-10-9101. NGK recommends that you start your vehicle and bring up to operating temperature with stock heat range plugs, then switch to the racing plugs.
Last edited by TeamRX8; 02-13-2010 at 10:28 AM.
02-13-2010, 09:02 AM
#19
Good info.
Currently i am running the denso's the IRLO1- 31's and 34"s.
They have done well--installed them in september/09.
I am now looking hard at a silver Brisk but approaching cautiously
I need to look at the ones you mentioned.
Headed toward Road Atlanta in March and expected to be turning sub 1:45 times
I have decided to have dedicated plugs and coils for track events--just like my old days in drag racing
Currently i am running the denso's the IRLO1- 31's and 34"s.
They have done well--installed them in september/09.
I am now looking hard at a silver Brisk but approaching cautiously
I need to look at the ones you mentioned.
Headed toward Road Atlanta in March and expected to be turning sub 1:45 times
I have decided to have dedicated plugs and coils for track events--just like my old days in drag racing
02-13-2010, 11:30 PM
#21
Embrace The Sparkles
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Dont bash the OP, he has legitimate points. $80 for Spark plugs is ridiculous.
If your not going to look outside the box why have a forum at all?
An Automatic Rx8 owner **** talking......you fail.
If your not going to look outside the box why have a forum at all?
An Automatic Rx8 owner **** talking......you fail.
02-14-2010, 09:17 PM
#24
Good advice from all and i appreciate it.
Dont know ---I like choices?
Currently --unless I go with the flattops- no one around here stocks a plug I can use.
Our plugs are way overpriced--guess it has to do with volume?
Plan at this time is to get the new coils and a set of R 6725, for track use.
Still undecided about the street,
Searching.......
Dont know ---I like choices?
Currently --unless I go with the flattops- no one around here stocks a plug I can use.
Our plugs are way overpriced--guess it has to do with volume?
Plan at this time is to get the new coils and a set of R 6725, for track use.
Still undecided about the street,
Searching.......
02-15-2010, 02:30 PM
#25
Super Moderator
Do Moderators do ANYTHING!!???..can these threads be put in the Correct Series 1 SUB FORUM..Please..