What Plugs?
03-27-12, 05:06 PM
#52
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They do. http://www.ngk.com/results_cross.asp?pid=BUE
Reach is ~1.5mm shorter than stock, but you can overcome it a little bit by replacing the crush washer with a flat spark plug washer, and tap the rotor housing just a little bit further. It is still a bit more recessed than stock, but there are no protrusions (ground straps) to become hot spots.
Note: I haven't used these yet, but I was messing around with an old rotor housing to get them to fit better, and would like to try them maybe this year.
Reach is ~1.5mm shorter than stock, but you can overcome it a little bit by replacing the crush washer with a flat spark plug washer, and tap the rotor housing just a little bit further. It is still a bit more recessed than stock, but there are no protrusions (ground straps) to become hot spots.
Note: I haven't used these yet, but I was messing around with an old rotor housing to get them to fit better, and would like to try them maybe this year.
Found a NGK 5/8 hex plug with a heat range of 11 and a reach of 19mm for 3$. Going to give these a try.
This is the "correct" HKS 10.5 race plugs for reference.
03-29-12, 12:04 AM
#55
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^Nice.
And again for some other options, here is the surface discharge NGK BUE, PN 2322:
Notice the porcelain traveling the entire extent of the electrode; as 13BT-RX3 pointed out (these plugs were his idea) you can't make a colder plug. So, you'd better have a pretty hot ignition system to keep these puppies from fouling. They are made for outboards with CDI I believe.
Again, I had to make a couple "modifications" to the rotor housing to get them fitting better, including a bit of tapping, removing some of the casting around the plug boss, thin-wall socket and removing the thicker compression washer (not sure how good of an idea that really is, but loc-tite is your friend!)
And difference between the BUE and stock BUR:
I got it to within ~0.045" more recessed than a stock plug. Worth a shot I figure!
Best part about these plugs? The price.
http://www.rockauto.com/catalog/rafr...0&partnum=2322
And again for some other options, here is the surface discharge NGK BUE, PN 2322:
Notice the porcelain traveling the entire extent of the electrode; as 13BT-RX3 pointed out (these plugs were his idea) you can't make a colder plug. So, you'd better have a pretty hot ignition system to keep these puppies from fouling. They are made for outboards with CDI I believe.
Again, I had to make a couple "modifications" to the rotor housing to get them fitting better, including a bit of tapping, removing some of the casting around the plug boss, thin-wall socket and removing the thicker compression washer (not sure how good of an idea that really is, but loc-tite is your friend!)
And difference between the BUE and stock BUR:
I got it to within ~0.045" more recessed than a stock plug. Worth a shot I figure!
Best part about these plugs? The price.
http://www.rockauto.com/catalog/rafr...0&partnum=2322
04-01-12, 06:44 PM
#56
sparkplugs.com says that R6252 plug is a 19mm reach. Stock and the 6725 and 7420 plugs are 21.5mm. Gap on the R6252 is .060"! The 6725 and 7420 is .028".
Personally I hate the thought of using the shorter plugs and just asking for carbon to build up in the void only to become a nice glow plug like heat riser.
You spend 3k+ to build an engine. Is an extra $100 a year on the right spark plugs really such a bad idea?
Personally I hate the thought of using the shorter plugs and just asking for carbon to build up in the void only to become a nice glow plug like heat riser.
You spend 3k+ to build an engine. Is an extra $100 a year on the right spark plugs really such a bad idea?
Gapped the new plugs to .021 and threw them in. What a difference!
Think I have more torque now especially in 3rd gear. My tires were actually slipping in 3rd.
Every little thing helps.
04-11-12, 04:46 PM
#59
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Still run those same plugs in rotary applications almost evryone racing a turbocharged rotary does. For the mazda 4cyl we run a 10 heat range r5724-10.
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