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By oldcarmark - 15 Years Ago
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Just installed a Pertronix 2 with the Flamethrower 1 coil.Is it a good idea to go wider on the plug gap?Stock specs are .032-.036.How much wider?Did some research on the internet with mixed answers.Going wider makes it harder on the stock type wires and cap are some answers I found.Any thoughts?
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By GREENBIRD56 - 15 Years Ago
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Mark there is quite a write-up in here about plug gaps - and Ted had some useful info about how the smaller gaps worked on his competition and dyno engines..must be about page three or four.... http://www.y-blocksforever.com/forums/Topic17846-3-3.aspx
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By rgrove - 15 Years Ago
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I just tried this about 2 months ago. Same setup, went with .045 or so gap (based on stuff I read here and other places). Car ran like CRAP (no other changes) Horrible is the best word for it. Pulled the plugs, narrowed them up to .035, put them back in, and it ran like a champ again; no other changes. Based on that, Id recommend just staying on the bigger end of the recommended range. Just my 2 cents
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By charliemccraney - 15 Years Ago
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It seems like I ran .045 when I had the ignitor II, but I also had the Flamethrowe II coil which is hotter.
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By 55Birdman - 15 Years Ago
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I have the petronix set up in my bird with MSD 6AL box and coil and I have my plugs gapped at .035 . Never had any issues.
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By Rono - 15 Years Ago
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What about plug type themselves? Do you guys favor Autolite, Champion, NGK, etc.? I run Champion gapped at about .043" with the Pertronix and Flamethrower II coil, But I'm always open to other ideas for better performance. Rono.
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By 55vickey - 15 Years Ago
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I've got mine gapped 40>42 and it starts and runs great. Gary
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By Ted - 15 Years Ago
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Rono (6/15/2010)
What about plug type themselves? Do you guys favor Autolite, Champion, NGK, etc.? I run Champion gapped at about .043" with the Pertronix and Flamethrower II coil, But I'm always open to other ideas for better performance. Rono. I lean towards Autolite and Motorcraft sparkplugs in the FoMoCo engines, AC in the GM products, and can not remember the last time I actually purchased a Champion spark plug. Testing of the various brands on the dyno shows no difference in performance providing the gaps and heat ranges are the same so it really just ends up being a brand preference or how well the spark plugs hold up over time.
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By Y block Billy - 15 Years Ago
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Spark jumps from sharper corners much better than rounded, I have always filed my plugs by flattening the bottom of the strap, then taper each edge and the end into a paramid so the bottom edges by the electrode have the sharp corners. Bend the strap so the end of it is center of the electrode, not going past it. I have been doing this for 30 plus years and have never had problems with fouling, skipping plugs. Also through experimenting with chain saws when I was a teen working in the woods and on snowmobiles, dirt bikes etc. I would take the plug out, change the gap, and retry in the hard wood over and over and over trying many different gap settings and always found more power by going to a smaller gap then recommended. Gapping larger always lost power. From My back yard experiments.
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By pegleg - 15 Years Ago
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Interesting Billy. You and Ted have come to the same conclusion. I never found a difference until you encounter misfire. Must be something there though if Ted finds it on a dyno. With the blown motor in my car and an MSD Blaster I've been using .042, maybe I'll try closing it down and see what happens.
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By Doug T - 15 Years Ago
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I have always use Autolite/Motorcraft in most of my cars. I have had two Champion plugs blow out their porcillin centers when I did use them. Of course I have only been driving for 51 years.
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By MarkMontereyBay - 15 Years Ago
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I don't use Champion plugs at all. I use Motorcraft and Autolite. Champions and Fords don't mix, most Ford techs I know won't use them. One reason is they seem to "weld" themselves to the head surface and can be a chore to remove. Often, in the process they end up cracked or worse.
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By aussiebill - 15 Years Ago
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MarkMontereyBay (6/21/2010)
I don't use Champion plugs at all. I use Motorcraft and Autolite. Champions and Fords don't mix, most Ford techs I know won't use them. One reason is they seem to "weld" themselves to the head surface and can be a chore to remove. Often, in the process they end up cracked or worse.Mark, growing up using champion plugs, i was used to the heat ranges and numbering system, as the years moved on tuneing hundreds of cars in business, i seemed to encounter more broken ceramic electrode insulators. It was while racing 302w at drags that we changed to NGK plugs and wow! instant higher rpm range and better times, since then i,ve stayed with them. regards bill.
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By carl - 15 Years Ago
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Way back when i was a kid my brother wanted to set the plugs on the lawn mower,we didnt have a feeler gage so i told him to use a dime,he didnt have a dime so he used two quarters. Carl
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By Talkwrench - 15 Years Ago
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AussieBill. What NGK plugs should I be using in my 292.. gaped at ?? with petronix....
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By Y block Billy - 15 Years Ago
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Bill, I am not a fan of NGK either, while growing up having many a dirt bike and snowmobile, we would stop for a break and then when we went to go again the plugs would have no spark, had buckets of junk NGK. I switched to Bocsh and one time about 14 years ago me and my brother were snowmobiling and we stopped for a break, when we went to go his sled would not run, he changed plugs several times and I kept telling him to try the plugs from mine and he would not believe me that the NGK's were junk. He was going to leave his sled in the woods and wanted me to give him a ride out. I finally convinced him to try my Bosch plugs and he did. His sled started first pull and never ran better. I on the other hand I had to use his plugs and ran on one cylinder all the way out. He is 11 years older than me and has much more mechanical experience, but I sure made a believer out of him that day that the NGK's are junk. The bosch Platinums work great in the two strokes and while all the guys on the lake are fouling and swapping those NGK's constantly, mine never misfires and I have had the same plugs in a sleds and outboards for years.
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