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Old 03-11-2010, 10:50 AM   #1
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Autolite 103 vs Autolite 104

I would like to keep this thread short!
Per some comments in the WeaponX thread.
Are the Autolite 103's significantly better than the 104's?
I only ask as they are one step colder than the 104's.
Currently, I have no issues with the 104's, but if there is any gain or benefit with the 103's it would be nice to know.
Thanks.
P.S. Yes I searched for "Autolite, 103" and got no relevant hits.


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Old 03-11-2010, 10:54 AM   #2
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Did you look at the dyno???

The STOCK run was 104's then the 103's were the next run... and they made more power.
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Old 03-11-2010, 11:00 AM   #3
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Would the 103's be ok to run in the 2.0 heads? Earlier talk about them said they were run in the 2.3 b/c of the better flow, would running a colder plug possibly damage the 2.0?

Also what Gap?
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Old 03-11-2010, 11:03 AM   #4
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Quote:
Originally Posted by 03OrangeSVT View Post
Did you look at the dyno???

The STOCK run was 104's then the 103's were the next run... and they made more power.
Ever since I updated my browsers, I have been having rendering issues. So yes I looked at the dyno, but its sorta small and text is very hard to read (not just the FF forum).
I assumed that the stock plugs were the original 'fine wire'. Not 104's.
sorry, my bad! I will have another look. Guess I gotta figure out what the heck is up with my browsers now!
Well heck. As long as your 'here', are the disk type gappers OK to use? I have read yes/no/yes/no.... I have the wire type now.
Thanks!
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Old 03-11-2010, 11:19 AM   #5
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Quote:
Originally Posted by focusin View Post
Would the 103's be ok to run in the 2.0 heads? Earlier talk about them said they were run in the 2.3 b/c of the better flow, would running a colder plug possibly damage the 2.0?

Also what Gap?
I am sure I read that all were gapped to .050. But I did not look back to find the post (deep thread).
I should have included I have a 2.0. So that's relevant.
03OrangeSVT >> this is what was written at the top of the dyno.
So that is why I assumed it was the fine wire's.
Blue = Stock Car With Factory Plugs (107.8 Max HP / 112.8 Max Torque)

FireFox is broken apparently.
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Old 03-11-2010, 11:22 AM   #6
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Quote:
Originally Posted by focusin View Post
Would the 103's be ok to run in the 2.0 heads? Earlier talk about them said they were run in the 2.3 b/c of the better flow, would running a colder plug possibly damage the 2.0?

Also what Gap?
I was going to get 103's, but when I put my car/engine model on the lookup tool, it only showed me 104's as compatible with my engine. I'm guessing the threading for the plug is the same and you COULD use 103's in a 2.0L platform. I wouldn't unless I had a turbo application though.

I got mine gapped at .060 and it's been fine.
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Old 03-11-2010, 11:37 AM   #7
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It's OK to use a colder plug, the only issue you might have is eventual fouling (not enough heat to self clean).
I have been using 104's, but I trim the strap A.K.A like the 103's. Gapped at .060. (I built a special jig to do this). But there are other considerations for a plug. So hence the thread question. Would I get a tad more power with a 103?
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Old 03-11-2010, 11:37 AM   #8
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The only difference between the 103 and 104 is the way they disapate heat. there is no difference in electrical transfer. too hot of a plug may cause preignition, dieseling, etc. While too cold of a plug may foul due to not reaching self cleaning temp of 450 which when reached cooks (fouls) deposits on the plug.
If it worries you to run the 103's, just pull one at the first oil change and check if it's beginning to foul.
In this diagram notice the only difference is the insulator length.



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Old 03-11-2010, 11:50 AM   #9
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Thanks!
I did not know if details like the Chromium-nickel alloy strap would be relevant or not.
So I guess I will give a set a try.
Any opinions on the disk type gappers? (Typically sold at the check-out for a couple bucks).
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Old 03-11-2010, 11:54 AM   #10
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The disc type is fine for what you'll use it for.
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