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Old 09-12-2005, 09:47 AM   #1
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Default Which plugs to use?

As the title says I am wondering what plugs I need for the new engine.

This does sound like a stupid question, but I will give the reasons.

The new engine going in my 1990 is from a 1988 Toronado,
In the Haynes manual for 1988 only it calls for the R44LTS6(41-936 for platinum),
my 1990 calls for R45LTS6 ( 41-902 for the platinum)
and I am doing the ignition upgrade to the 97+ SC coils which call for 41-101( platinum only).
All these numbers ore for AC Delco plugs, since that is what I use

Right now I just installed the R45LTS6 ( what is supposed to be in the 90), but do plan on going back to platinum (41-902) as before the engine blew.


So should I be using what the engine calls for, what I used previously, or what the ignition calls for ( for the new coils).

It'* always the simple questions that are the toughest, LOL.
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Old 09-12-2005, 09:56 AM   #2
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Mike,
W/o knowing the plugs by their numbers, are all the gaps the same or similar. Remembering that gap will also control heat to a certain degree. That may be the largest difference.

While being sold on how well Iridiums lasted in my 00 truck I have changed the 97SSEi out to TR-55'* and find good performance.

As long as you plan to run stock I'd stick w/a reasonable middle of the road. You need to consider the coils and igition system being slightly different.
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Old 09-12-2005, 10:15 AM   #3
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And remember that a hotter spark can jump a gap better, so if you go with the TR55 on a stock NA motor, stick with the .060" stock gap.
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Old 09-12-2005, 10:18 AM   #4
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Quote:
Originally Posted by willwren
stick with the .060" stock gap.
I'm running 0.045"

(Magnavox Coil)
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Old 09-12-2005, 10:19 AM   #5
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In your Bonneville? You are going to have problems. I run .055" on my TR55'* in the winter, and .050" on my TR6'* in the summer, and that'* on a car that needs it. You don't.
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Old 09-12-2005, 10:35 AM   #6
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I am planning on keeping the correct gap, right now it is at 0.60". I just didn't know if I should use the plug recommended for the engine or the ignition system.

Iridium was another option I was looking at.
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Old 09-12-2005, 10:42 AM   #7
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Skip the iridiums..they are just more expensive. Not really worth the cost in my book if you are going to do the proper maintenance on a car.
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Old 09-12-2005, 10:46 AM   #8
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I can get them for the same price as the platinums, or pretty close anyhow.
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Old 09-12-2005, 10:47 AM   #9
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Mmm I also chose to stay away from platinums..
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Old 09-12-2005, 11:32 AM   #10
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Supercharged cars MUST stay away from platinums.

Mike, run the NGK V-Power TR55. You won't have any problems.
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