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#41
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My quote was also from NGK.
If spark and voltage wasn't a concern then a coil pack for each cylinder and increased duration with voltage in the new cars wouldn't matter right? All about efficiency and burn. They work period. Will a street/strip car benefit with big cams, bigger carbs and higher rpms? Will an engine run at peak with a proper tune without one? Yes. But. I have seen and felt the difference with and without one. Run if ya want, don't if ya want. Your money your hot rods. I run em. I give boxes 2 thumbs up. |
#42
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OP was asking about a low compression street 455, and if he needed a MSD Box.
How does this relate to his vehicle? Does anyone have any dyno data or other real world experience that shows when an MSD style box truly becomes effective? I don't really need a fancy rev limiter. "Would a low compression 455 with a RA 4 cam see any benefit? Just wondering when does it start to show results? Always does? High compression? Big cam? High RPM? It seems like there are a lot of people running these with all different types of combinations but when does it really show some type of benefit?" Answer in several people posts is no benefit. All of that "coil pack for each cylinder and increased duration with voltage in the new cars wouldn't matter right?" is mandated by current Emissions and F.E. regs that must be met or the stuff would not be there. The stuff IS expensive, Ken. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#43
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Quote:
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ECM member. 2008 Outlaw Pontiac Drag Series Champion MANDRA Do it now fool! Life is short. 69 Grand Prix/3163lbs / IAII 535 w/ Tiger heads by Gaydosh....9.35@ 144 so far.. through mufflers. 1.26 60'. Going back to track with pump gas engine.... My 60 Ventura retired to street/strip duty.. |
#44
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An msd box shows a gain on any vehicle that has a carburetor that is not optimized for its application. Especially at low rpm where the multiple spark deal is doing its thing.
Fix the carb and you'll see no more increase. Comparing a new anykind of dist especially an msd to a trashed untouched worn out stock point dist is like comparing fuel dragsters and vw bugs. Idea has merit, but in actual application not so much. I still believe in the long duration single spark principle. |
The Following User Says Thank You to Sun Tuned For This Useful Post: | ||
#45
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Just want to say I always enjoy reading your posts, Sun Tuned.
You get the "long duration single spark" with the multispark ignition at higher RPM. They claim you get 20 degrees of crank rotation of spark. At low RPM there is plenty of time for multiple sparks. At high RPM there is only time for one spark of 20 degrees of crank rotation. |
#46
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Quote:
LOL How many people in our hobby are actually running a "trashed untouched worn out stock point dist" ~ really!?!? I'd wager none. They're easy to service, are rock stock reliable, and IMHO nothing beats a properly set up points distributor, with a brand new set of points. But hey, we're all entitled to our own opinion right? lol If anything most people go to an HEI (ect) because of lack of required maintenance. Not to mention that unlike electronic distributors which can leave you stranded if something goes awry (been there when a magnetic pick up went south), replacing points and getting back on the road is easy-peasy. Are points distributors ideal for someone who's got a dedicated drag setup(?) - probably not, but for the rest of us, they are just fine. (I mean how many people run an HEI with the wrong resistance wire feeding it?!)
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#47
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We are talking about Ignitions here and the GURU of Ignitions on the PY board just posted in Post #44. Nuff Said.
Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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