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DRR Trophy |
Going from race gas to alky...is it IMPERATIVE to change plugs, i.e., colder? 10.8 to 1, sbf, 480 HP. Up to now, 3924 Autolites are working just fine. Nice tan color and never a problem. Why should I change? | ||
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DRR Trophy![]() |
I would use 1 heat range hotter than required for gas/compression and .030 gap 2008 Summit Super Pro ET National Champion Bart's Dominator Service | |||
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DRR Top Comp |
What Bart said. ^^^^^ Clowns to the left of me, Jokers to the right. Here I am....... | |||
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DRR Pro![]() |
Why would you go hotter than your gas set up??? ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
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DRR Pro![]() |
I would go one step colder with methanol. ![]() ΜΟΛΩΝ ΛΑΒΕ | |||
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DRR Top Comp![]() |
Why hotter? Why colder? Like to know your reasoning. I run same with gas or alcohol but have not done any testing with it. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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DRR S/Pro |
I would "think" hotter. People are always complaining about being able to build heat in an alcohol engine, starting it on gas. If you're not putting as much heat in the cooling system you must not be building as much heat in the combustion chamber. But that just logic, those that run alcohol will know better. Illegitimi non carborundum | |||
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DRR S/Pro |
I believe you run hotter to keep plugs from fouling. Plugs foul easier on alky than gas from what I hear. | |||
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DRR Sportsman |
spark plug heat range has little to do with actual engine temperature; lots to do with how well the spark plug dissipates heat. Read your plugs and they will tell you if you need hotter or colder. Mine didn't want anything different than it did with gas, similar experiences with many other cars but everyone's stuff is different. | |||
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DRR Pro![]() |
Guys here is a really good read. https://www.enginebuildermag.c...ark-plug-heat-range/ ____________________________ 2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion 2018 Div4 Goodguys Hammer award winner | |||
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DRR Trophy |
I have been running alky since the early 90's and have had probabally 10 different combos. 388 small block to 572 big block. Carburated and injected and chased the plug heat range thing. I found little if none in performance gains. Nothing big at all. Now all the combos were from 13.5 to 14.8 compression, 110 to 114 lobe separation cams and 6300 plus converters. NGK, Autolite,Accell,AC delco and Champion. Now I did find that some combs liked projected tip better and go figure one more step as I hed to index the plugs on those motors. Also timming between 28 and 34 degrees. But I hope more people respond as this was just my own experience and no dyno time just on the track. There has to be some on here that have hours of dyno experience in this area that can shed light in this area. | |||
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DRR Trophy |
IM WITH SLICKSTER ON THIS ONE SAME KIND OF EXSPERIENCE WITH DIFF COMBOS AND PLUGS | |||
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DRR Pro![]() |
What I've been told is to run the coldest plug I can that will still fire the mixture..... Mark Goulette Owner/Driver of the Livin' The Dream Racing dragster www.livinthedreamracing.com "Speed kills but it's better than going slow!" Authorized Amsoil Retailer | |||
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DRR Trophy |
Just for everyones information alcohol does not foul plugs. It carries electricity. Gas does not. | |||
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DRR S/Pro |
I am sure to most of us if the plug isn’t firing then it is considered fouled. A soaking wet plug is considered fouled in my book. A hotter plug will stay dry better and keep firing properly. Too hot of plug can cause destination by firing the mixture before the plug fires. | |||
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DRR Trophy |
Methanol A/F is richer and a tighter plug gap works better in my experience. .022-.024 works for us with the GRID and 8261 coil. Our A/f on the RP is approximately 5.0 using a NGK -7 plug 13.5cr with Enderle fuel injection. The OPs CR is on the low side so i would error a little hotter. Now throw in the discussion on water temp with this too. 1.34 9.42@ 142.41 1.29 5.97 @ 114.00 @ #3251 Better in 2022 427 BBC by S&S Speed Center, AFD, Enderle MFI by Spud Miller Trackside Products, Sepanek Racing T400, Dynamic converter, Autoweld, Santhuff, Smith Racecraft, His real name is Richard but they call it "**** Fords Body Shop" | |||
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DRR Pro |
.......Exactly..... Fellow racer and servant of the Lord of Lords John 14:6 "Creekside Racing Ministry" MFI system, ProCharger Non-intercooled [6.02 @ 229 or 3.91/660' soft tune and killing power above 6K rpm] Ron Clevenger | |||
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DRR Pro |
.......Wrong direction... Fellow racer and servant of the Lord of Lords John 14:6 "Creekside Racing Ministry" MFI system, ProCharger Non-intercooled [6.02 @ 229 or 3.91/660' soft tune and killing power above 6K rpm] Ron Clevenger | |||
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DRR Top Comp |
Depends on the octane of the gasoline. Colder plug makes for a larger window to advance the timing. Methanol, power is heat in the chamber. The engine you're working with is low compression, so what fuel did you use to produce the current plug reading you're basing your question on? | |||
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DRR Pro |
.....I would have a different opinion on that. Fellow racer and servant of the Lord of Lords John 14:6 "Creekside Racing Ministry" MFI system, ProCharger Non-intercooled [6.02 @ 229 or 3.91/660' soft tune and killing power above 6K rpm] Ron Clevenger | |||
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