[PONTIAC DUDE]

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.

[Tom Vaught]

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.

[60man]

Originally Posted by Tom Vaught

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.

Don't see why it would not help idle and low end power with the extra spark coverage per rotation....JMO..But I'm a back yard engineer Tom...

[Sun Tuned]

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.

[Motor Daddy]

Originally Posted by Sun Tuned

I still believe in the long duration single spark principle.

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.

[unruhjonny]

Originally Posted by Sun Tuned

...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. ...

In for the dramatic side of things much?

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?!)

[Tom Vaught]

We are talking about Ignitions here and the GURU of Ignitions on the PY board just posted in Post #44. Nuff Said.

Tom Vaught