on the TR6s 
Sparkplugs for 243 casting heads (high compression)
Thread Starter
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
Sparkplugs for 243 casting heads (high compression) Quick Q. Tuning my new HC setup. 243 heads (10.7 to 1 compression). Noted that the car does NOT like lots of timing (ie abov 24 degrees WOT and a little less than stock values pat throttle. Anything more = knock.
Running TR55 plugs. These too hot? Thinking maybe I should go back to TR6's. $0.02 appreciated.
Running TR55 plugs. These too hot? Thinking maybe I should go back to TR6's. $0.02 appreciated.
With high compression and a lot of timing retard, you probably want to close down the gap a bit too. OE spec is 0.060", maybe try 0.045" to make sure you stay clear of misfire.
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i went with a 7 range plug for n2o and im running a little more compression than you...I was having bad knock issues with the stock timing tables and the 6 range plug....I found stock ls6 timing tables and went with the colder plug and it eliminated my problem....high compression and pump gas = tuning
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Thread Starter
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
i went with a 7 range plug for n2o and im running a little more compression than you...I was having bad knock issues with the stock timing tables and the 6 range plug....I found stock ls6 timing tables and went with the colder plug and it eliminated my problem....high compression and pump gas = tuning
Thread Starter
Joined: Jun 2004
Posts: 1,501
Likes: 7
From: Ft. Irwin, California (But Virginia is home)
But, to answer your Q, they looked light grey and the electrodes were fine. There was a hint of brown on a couple of the ceramics by the electrode, thus confirming sporadic knock.
The TR55's were gapped to .050.
The TR6's I just installed are gapped to .035.
11 Second Club
Joined: Jun 2005
Posts: 1,537
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From: Was New Orleans, but swam to Baton Rouge
The TR55's got swapped today......
But, to answer your Q, they looked light grey and the electrodes were fine. There was a hint of brown on a couple of the ceramics by the electrode, thus confirming sporadic knock.
The TR55's were gapped to .050.
The TR6's I just installed are gapped to .035.
But, to answer your Q, they looked light grey and the electrodes were fine. There was a hint of brown on a couple of the ceramics by the electrode, thus confirming sporadic knock.
The TR55's were gapped to .050.
The TR6's I just installed are gapped to .035.
