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Re: Projected tip plugs more prone to detonation?
[Re: tex013]
#2373105
09/19/17 02:03 AM
09/19/17 02:03 AM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
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I Live Here
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Not about that, if your hard testing can reveal real world results of course in your racing atmosphere/conditions, then we all learn some cool stuff and can pass it on............. 
Last edited by Thumperdart; 09/19/17 01:05 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Projected tip plugs more prone to detonation?
[Re: davenc]
#2373552
09/19/17 09:03 PM
09/19/17 09:03 PM
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Joined: Aug 2011
Posts: 2,853
Pattison Texas
CSK
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master
Joined: Aug 2011
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Pattison Texas
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here is my projected tip -5 ngk, has some carbon on it , but I would expect that, they have been in there since day one, 4000 miles, mostly street , seven 1/4 mile passes in the heat of summer & no detonation. like I said 512,9.5 comp , small solid.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: Projected tip plugs more prone to detonation?
[Re: CSK]
#2373572
09/19/17 09:44 PM
09/19/17 09:44 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
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I Live Here
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What's w/those ashy deposits.........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Projected tip plugs more prone to detonation?
[Re: Thumperdart]
#2373578
09/19/17 09:57 PM
09/19/17 09:57 PM
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Joined: Aug 2011
Posts: 2,853
Pattison Texas
CSK
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master
Joined: Aug 2011
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Pattison Texas
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What's w/those ashy deposits......... the camera made them look lighter, its black carbon build up,a lot of tuning & the AFR was rich at different times.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: Projected tip plugs more prone to detonation?
[Re: davenc]
#2373580
09/19/17 10:00 PM
09/19/17 10:00 PM
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Joined: Aug 2011
Posts: 2,853
Pattison Texas
CSK
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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I had a REAL hard time getting the transfer slots, cruise AFR to lean out, I should have asked you for help  its all good now.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: Projected tip plugs more prone to detonation?
[Re: CSK]
#2373583
09/19/17 10:06 PM
09/19/17 10:06 PM
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Joined: Dec 2004
Posts: 10,552
Rittman Ohio
fourgearsavoy
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I Live Here
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Rittman Ohio
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They developed that twin ground plug to combat misfires to save cat converters. I started seeing them in Tacoma pick-up trucks with the 3.4 engine. I am currently running Denso iridium plugs for a Toyota Tundra in my 10.9 compression 493 with Indy EZ heads and they run perfect all year long. I have considered using the twin ground plugs but it runs so well with the iridium plugs why change  Gus
Last edited by fourgearsavoy; 09/19/17 10:09 PM.
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
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Re: Projected tip plugs more prone to detonation?
[Re: fourgearsavoy]
#2373632
09/19/17 11:13 PM
09/19/17 11:13 PM
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Joined: May 2005
Posts: 598
NC, USA
davenc
OP
mopar
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OP
mopar
Joined: May 2005
Posts: 598
NC, USA
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I am currently running Denso iridium plugs for a Toyota Tundra in my 10.9 compression 493 with Indy EZ heads and they run perfect all year long. I have considered using the twin ground plugs but it runs so well with the iridium plugs why change Gus What type of plug did you run prior to the iridiums? Did you notice anything on the change?
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Re: Projected tip plugs more prone to detonation?
[Re: davenc]
#2373643
09/19/17 11:27 PM
09/19/17 11:27 PM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
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master
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Posts: 7,506
Az
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Are projected tip plugs more prone to detonation, as compared to the equivalent non-projected tip plug?
All else being equal, Yes!
Fastest 300
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Re: Projected tip plugs more prone to detonation?
[Re: Crizila]
#2373658
09/19/17 11:46 PM
09/19/17 11:46 PM
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Joined: May 2005
Posts: 598
NC, USA
davenc
OP
mopar
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OP
mopar
Joined: May 2005
Posts: 598
NC, USA
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Are projected tip plugs more prone to detonation, as compared to the equivalent non-projected tip plug?
All else being equal, Yes! OK, this is the first voice with a clear contrary position. Can you share your thoughts on this? Do you think the projected tip is hotter than a standard plug and can act like a hot spot (that was my original thought)?
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Re: Projected tip plugs more prone to detonation?
[Re: CSK]
#2373666
09/19/17 11:58 PM
09/19/17 11:58 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
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I had a REAL hard time getting the transfer slots, cruise AFR to lean out, I should have asked you for help its all good now. I'll say this, I do NOT shoot for lean cruise afr's cos we are not efi we have carbs and WET manifolds so richer mixture work/run way better for me and many others I build for. Now I don't mean cruising in the 11's or low 12's but cams w/duration and overlap need to be richer and if I want mileage, I cruise my Ranger..........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Projected tip plugs more prone to detonation?
[Re: davenc]
#2373685
09/20/17 12:27 AM
09/20/17 12:27 AM
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Joined: Oct 2003
Posts: 7,506
Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Are projected tip plugs more prone to detonation, as compared to the equivalent non-projected tip plug?
All else being equal, Yes! OK, this is the first voice with a clear contrary position. Can you share your thoughts on this? Do you think the projected tip is hotter than a standard plug and can act like a hot spot (that was my original thought)? No matter what the heat range numbers say for a particular plug ( or comparing different brands of plugs), the farther the porcelain and tip is from the plug housing, the hotter it is going to run. The hotter it runs, the more prone to detonation it is going to be. Just because you can't hear it or see aluminum flecks on stuff, or melted ground straps, etc, doesn't mean your engine isn't running in some degree of detonation. Long before there were knock sensors on engines, I worked in a knock lab ( late 60's ) for a large oil company. An eye opener regarding engine detonation. I wouldn't be surprised if over half the build claims I see on this sight ( running outrageous CR's on pump gas )are running in some degree of detonation. It's just not enough to see / hear or to break stuff - but can be enough to negatively affect performance - and definitely enough to shorten engine life. Hence, knock sensors on all late model performance cars from the factory. KNOCK KNOCK, WHO'S THERE -----------. Hey Thumper, how's tricks? 
Last edited by Crizila; 09/20/17 12:30 AM.
Fastest 300
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Re: Projected tip plugs more prone to detonation?
[Re: Thumperdart]
#2373699
09/20/17 12:56 AM
09/20/17 12:56 AM
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Joined: Aug 2011
Posts: 2,853
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,853
Pattison Texas
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I had a REAL hard time getting the transfer slots, cruise AFR to lean out, I should have asked you for help its all good now. I'll say this, I do NOT shoot for lean cruise afr's cos we are not efi we have carbs and WET manifolds so richer mixture work/run way better for me and many others I build for. Now I don't mean cruising in the 11's or low 12's but cams w/duration and overlap need to be richer and if I want mileage, I cruise my Ranger.......... I understand all that, BUT my Charger is the only car I have to drive, so my AFR is on the edge of lean.
1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5
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Re: Projected tip plugs more prone to detonation?
[Re: Crizila]
#2373707
09/20/17 01:05 AM
09/20/17 01:05 AM
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Joined: Aug 2003
Posts: 43,127
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,127
Bend,OR USA
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I know of another guy in SO CA that worked in a knock lab also, he lead me to use the projected tip spark plugs in iron headed B and RB motors as well as all of the Mopar hemi motors for drag racing and street use  Same information, different conclusions  I had low compression(true 8.5 to 1) pump gas 350 Chevy boat motor that pinged, knocked, on regular pump gas with a Champion J12Y and quit knocking with a Champion J11Y I worked in service stations a long time ago before they became gas stations only and I have seen many stock motors that needed the spark plugs heat range changed for the driver Around town only grandma drive differently than there hot rodder grand kids did Colder is always safer than a tiny bit to hot when it comes to gasoline and different driving conditions and fuel used
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Projected tip plugs more prone to detonation?
[Re: davenc]
#2373820
09/20/17 11:13 AM
09/20/17 11:13 AM
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Joined: Dec 2004
Posts: 10,552
Rittman Ohio
fourgearsavoy
I Live Here
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I Live Here
Joined: Dec 2004
Posts: 10,552
Rittman Ohio
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I am currently running Denso iridium plugs for a Toyota Tundra in my 10.9 compression 493 with Indy EZ heads and they run perfect all year long. I have considered using the twin ground plugs but it runs so well with the iridium plugs why change Gus What type of plug did you run prior to the iridiums? Did you notice anything on the change? Ran the iridium plugs since the first fire and never tried anything else I've been a tech for close to 35 years and I know how to read my plugs and they have a nice perfect burn on them and I have not heard any detonation even on 90* days with pump 93. Gus
64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
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Re: Projected tip plugs more prone to detonation?
[Re: Crizila]
#2373893
09/20/17 02:09 PM
09/20/17 02:09 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Are projected tip plugs more prone to detonation, as compared to the equivalent non-projected tip plug?
All else being equal, Yes! OK, this is the first voice with a clear contrary position. Can you share your thoughts on this? Do you think the projected tip is hotter than a standard plug and can act like a hot spot (that was my original thought)? No matter what the heat range numbers say for a particular plug ( or comparing different brands of plugs), the farther the porcelain and tip is from the plug housing, the hotter it is going to run. The hotter it runs, the more prone to detonation it is going to be. Just because you can't hear it or see aluminum flecks on stuff, or melted ground straps, etc, doesn't mean your engine isn't running in some degree of detonation. Long before there were knock sensors on engines, I worked in a knock lab ( late 60's ) for a large oil company. An eye opener regarding engine detonation. I wouldn't be surprised if over half the build claims I see on this sight ( running outrageous CR's on pump gas )are running in some degree of detonation. It's just not enough to see / hear or to break stuff - but can be enough to negatively affect performance - and definitely enough to shorten engine life. Hence, knock sensors on all late model performance cars from the factory. KNOCK KNOCK, WHO'S THERE -----------. Hey Thumper, how's tricks? Who's tricks...........I missed something....... 
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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