![]() ![]() I will admit, that is a real big difference, but I have had several guys tell me that the big gap was a big HP increase. I one instance, I got a 22 horsepower INCREASE by going to an 080 gap, from a 035 gap. The ONLY time I have ever seen plug gap make any difference is when you make it BIGGER. I have been dyno testing for over 40 years. going another step colder, (about the same as an ngk 8), now it only took 2 days and all of 30 or 40 miles for the engine to run rough.I do not know if the same is true for the 455 engines but here is some info about a test with different plug pags: Going to a plug one step colder (approximately an ngk 7) and then it would take about six or seven days for it to run rough vs about 1 month on the ngk 6. I found that with a carb and mostly easy driving (boosting for short periods) the 5 heat range was the one that would NEVER foul, and the 6 was border line too cold, as too much light cruising would cause partial plug fouling leading to engine roughness. Turbo over the years, and with other brands of plugs that would cross to colder heat ranges than I could get with an ngk ranges, just to see what would happen. For what it is worth, I've experimented with both ngk 5's and 6's on my A plug that is hot enough to never foul on a car that is never warmed up and never driven hard is also too hot for a car that is going to be driven hard all the time. The best possible heat range for a car that is intended to be driven hard is way too cold to be used on a grocery getter, as they will foul quick. You nailed it!! the factory plugs were developed knowing that most cars were not going to the track and not going to be driven hard. > charts were developed under controlled conditions. > oil consumption rate, cam, tuning, C/R, etc. > performance is like comparing oil performance. > What I should've said was, comparing spark plug > Asking people what spark plug works best is a I did some searching here but didn't find much, mainly testimonials regarding one experience with a particular engine. I was hoping to make up our own little comparison chart regarding heat ranges. Did they just get a bad rap because of the old extended tip, what were they UL15Y or something like that? My older brother asked me what ever happened to Champion, they used to have something for everyone? I just don't see Corvair folks recommending Champions. Larry Claypool seemed to like the Autolite 425 in everything. I've been looking around for something else since they are no longer in stock at O'Reillys or NAPA. I used Bosch W8AC and W8AC+ for several years in all Corvairs. What AC plug might the Autolite 2656 compare to?ĭoes the Champion L87YC compare to AC 44F?ĭoes the Champion L92YC commpare to AC 46F? Is the Autolite 275 a naughty extended tip? Local auto parts didn't have one. What AC plug would the Autolite 425 compare to? Would a NGK B6HS compare to a AC 44F and would a B5HS compare to a AC 46F? Would a Bosch 7502 or 7902 W8AC compare more to a AC 44F or 46F? The slightly hotter 46F is for the lower compression engines like 80 and 95. The 44F is for higher performance engines like 102, 110, 140 and 180. That changed to 44F and 46F with the loss of one thread. I would like to get opinions on the relative heat range of other brands comparing them to baseline AC. Most seem to have a vested interest in getting you to their brand. It seems like spark plug comparison charts I've found don't really agree. ![]()
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