Spark plug gap? (in my situation) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-11-2004, 01:38 AM   #1
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Default Spark plug gap? (in my situation)

I just picked up some autolite 605'*. What should I gap them to? I was told I should gap them at .057" with my mods setup as opposed to the .060" stock.
My current mods are:

3.4" pulley
Shielded CAI w/10" K&N cone
180* t-stat
Taylor Spiro Pro 8mm wires
Removed MAF screen
Magnaflow Wide Open muffler 3" inlet > dual 2.5" outlets
Removed exhaust resonator
Thermo Tec'ed crossover pipe


I hope to get myself a second income soon, and would like to do some internal mods (Todd -still doing the 1.9'*?), lifters (I believe I have some lifters starting to make noise now in the 5-6k range), 3" DP, and highflow cat, as well as a PCM if I can get someone to one for a 99.

Anyhow, currently I am running TR55'* gapped at .060" which have about 12k on them. I figured it wouldn't hurt to change and wanted to know what would be the best gap for my setup. I don't think any of the plugs are bad, as I finally got 30mpg. 250 miles one way on the freeway and stopped at a gas station and filled er up until it overflowed. only 8.2 gallons. Followed that tank up with a 27 mpg on the return trip, which surprised me as the was one less person in the car and the cruise was set at 75mph instead of the 80-85 on the way out.

Anyhow, Todd, Will, Dbtk2 (I know I messed that one up), silverbullet, anyone else with good knowledge on this, what are your takes on this?

Thanks in advance,
Martin
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Old 05-11-2004, 02:01 AM   #2
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im considering new plugs and wires........... but the plugs look hard as hell to get to in the back..... any tips?
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Old 05-11-2004, 11:16 AM   #3
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.57 should be ok, if you go a little deeper (add the rockers etc..) I would gap at .55 (which is what im gapped at with 104'*). I'll know the end of the month on the rockers, just depends on how much i want to spend changing things when i put the cam in, and if i have enough money You should get a scanner for the car before you start going to deep into the engine. You want to check for KR and things like misfires (maybe what your seeing in the 5-6k range). Gap at .57 then gap at .55 then at .60 and see which way the car runs the best.

Also the AC-delco wires are cheap and will do the job. Unless you want color in the engine I would stick with those. (if your trying to save some money I would however replace them with the plugs just to rule out the wires as a source of misfire. Also check each plug to make sure there are no cracks in the ceramic.
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Old 05-11-2004, 01:47 PM   #4
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how hard are the spark plugs to get at? is it an all day job to change those and plugs?

it was on my friends ford ranger...
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Old 05-11-2004, 01:49 PM   #5
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lets put it this way you have to crawl almost over the engine.
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Old 05-11-2004, 01:54 PM   #6
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I can do mine in about 30 min. The back 3 are done by feel. Headers make it a bit easier but they are still a pain.
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Old 05-11-2004, 02:56 PM   #7
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Plugs are easy on the Bonnie.. there'* a hell lot worse cars out there that in some scenario you would have to almost drop the whole engine to get to.. it'* a breeze..
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Old 05-11-2004, 06:04 PM   #8
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SSEi_MN - It'* not an all day job, but it is quite a fun task getting at the rear plugs on a Series I. It might be easier to put the car on ramps or blocks and come at them from underneath. I've always did my parents SC'ed Park Ave'* from the top -definitely no fun, but if you think it is hard to get at the back of a Series I L67 in an H-body you should try it in a Riviera -you'll think the Bonneville is a cake-walk.

Thanks Todd. I'll definitely be checking over the plugs when I pull the NGK'*.
I had been thinking about running down and having Lil Jon from MNCGP autotap my car since I wanted to see if there is knock retard when it starts to make the noise (doesn't do it all the time, but every so often I hear it - 90% of the time I bring it up into that rpm range I turn everything off so I can listen for detonation, knocking, etc... -you get that after detonating three turbo motors to death in less than 30 miles).

I still haven't gotten any of thet GM top-end cleaner, but I plan to run that through in the next week. Maybe that'll quiet it down somewhat.
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Old 05-11-2004, 06:37 PM   #9
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.55-.57 sounds about right. Each engine is different, and you'll basically have to do trial and error.

Go work on a 3100 in a Grand Am. Then come play with a 3800 in an H body. I found laying accross the fender/'Strut tower bar. Keeping a towel between you and the body is a good thing.
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Old 05-11-2004, 08:51 PM   #10
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Quote:
Originally Posted by jr's3800
I'm 6' 1" so I find that I can do a Bonneville in 10-15 minutes for plugs... Its sooo easy on a bonneville....

I will agree with Jason, a 3100 is a bit of a headache... Sometimes its just easier to remove the alternator to get to the back plugs in a 3100....lol
How many 00+ have you done?
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