[Skip Fix]

The dyno couldn't tell any difference from a DUI HEI and a MSD distributor and 7AL box on my pump gas motor.So the HEI is in the car and has a pretty good idle.

[Skip Fix]

The dyno couldn't tell any difference from a DUI HEI and a MSD distributor and 7AL box on my pump gas motor.So the HEI is in the car and has a pretty good idle.

If you look at most circle track cars they have TWO MSD systems wired in to easily swap during the race if one dies during the race. When they go they go.

[BruceWilkie]

HWYSTR455 FYI The Accel 300+ IS both CAPACITIVE DISCHARGE IGNITION AMPLIFIER and multi spark unit. SO IS THE MSD6AL. The multi spark is done by @3000 rpm on both. 300+ uses digital processing vs analog to perform its functions. The rev limiter is programmable vs set by a "pill"(resistor).

[TIN TIGR]

interesting point hwystr..1 big spark..really big spark..the accel , if i am not mistaken, was designed by a cat who had a company called "adrenline"..it was a single spark "magneto style" setup with a longer duration hit..i believe something like the big msd units..he sold out to accel and they had him modify it to be like msd, which held the market share..another case of good technology sell out..

[fasteddy]

Circle track cars use 2 MSDs? How many run a factory HEI? The amount of vibration on a circle track is tremendously hard on any ignition system. In going through the pits at the races, MSD boxes are 10 to 1 more common.

[79Lemans]

Originally Posted by TIN TIGR

here we go again...msd has real nice stuff, so does accel..i use both and you can feel the difference and it sure cleans the low speed where ya get lots of puddling and bad mixture control..keeps chambers cleaner and hotter..both good

the accel is a lot lighter, uses less power..the msd is pretty user friendly and their distributors are first rate and ez to curve and phase..

heis are for tow vehicles..its the same mindset that uses q-jets instead of dominators

(q-jets rock, i have one i will never sell..i have "hundreds" of hours tuning it, but for power i use a race carb)

oh damn, now i got the qweep to q-jet the new cv-1..go modern on your ignition and never look back, unless ya wanna watch that ford chasing you....

I DID SAY MOST INGNITIONS BOXES ARE GOOD. I THINK SOMEBODY HAS A PERSONAL PROBLEM.

[stimpy]

the reason nascar runs two is like on a gas airplane( redundancy) if one unit goes out they flip a switch and turn turn the other unit on they have two complete seperate systems (box and coil) but only one operates at a time , I use the Msd to retard the timing at top end of the track and it gives me a little more ommph not much but enough to win .

[Skip Fix]

the reason nascar runs two is like on a gas airplane( redundancy) if one unit goes out they flip a switch and turn turn the other unit on they have two complete seperate systems (box and coil) but only one operates at a time , I use the Msd to retard the timing at top end of the track and it gives me a little more ommph not much but enough to win

Exactly they can't swap on the extra one between rounds like drag racers can.
I've just known too many racers that took hours to chase down a MSD box issue or had one completely go out at the track.

I'm not saying they aren't worth using, new race motor is getting one. But don't expect to make more HP over a RACING HEI on a street strip Hp range motor. My pump gas motor is in the 575 HP and the MSD did nothing for it, but yes no rev limiter.

[stimpy]

the nascar thing I guessis because its a long push back to pit road and you know how murphy is he'll destoy that thing right after passing the pit row enterance .

[HWYSTR455]

Originally Posted by BruceWilkie

HWYSTR455 FYI The Accel 300+ IS both CAPACITIVE DISCHARGE IGNITION AMPLIFIER and multi spark unit. SO IS THE MSD6AL. The multi spark is done by @3000 rpm on both. 300+ uses digital processing vs analog to perform its functions. The rev limiter is programmable vs set by a "pill"(resistor).

Didn't say they couldn't be both, just that there is a difference. I'm only trying to be informative, not knocking either or any. Like I said, I run them on all my cars.

One thing I didn't realize is that the multi-strike stops at 3k rpm, intersting to know, and probably a good idea. Thanks for the info...

[BruceWilkie]

I also have the Accel375+ controller for the Accell which gives multiple stages retard, multiple stage rev limiting boost and start retards etc..

Digital advantage over analog is current draw and no pills to lose.

The high end MSD digital stuf has less features and requires add ons. For same functions MSD ends up costing a heck of a lot more for less features. Both systems work. Most failures I've seen with most brands is failing to properly match all components, poor grounding techniques, poor wiring(both low voltage and high voltage side). Especially coil mismatches.

[79Lemans]

[QUOTE=79Lemans]I DID SAY MOST INGNITIONS BOXES ARE GOOD. I THINK SOMEBODY HAS A PERSONAL PROBLEM.[/QUOTE. I WANT TOO APOLIGIZE (TIN TIGR) FOR WHAT I SAID TODAY I TOOK IT PERSONAL I WAS TOLD BY A FREIND ON THIS SITE THIS IS A WORN OUT SUBJECT ALONG TIME AGO AND HE SAID HE DON'T THINK YOU MENT WHAT YOU SAID TOWARDS ME.

[Tim Corcoran]

I have an MSD 6AL with a Blaster II coil and a Pro Billet dist. Been in the car for about 14 years, started out as a street strip car and now race only. Never once changed the points or had a module go out. Been 100% reliable and don't have to thnk about it. On the other hand I don't like the idea of the pills, they are just a marketing sceme to make MSD money. I think that the other brands may have a better product and I do like the ones that come with the extra features and don't require pills. I am not going to go back to points and I don't like HEI because it needs modifications to make the advance curve work right, and is not as reliable as the new systems, and big and bulky. Just my opinion.

Tim C

[RAIV55]

Originally Posted by Tim Corcoran

I have an MSD 6AL with a Blaster II coil and a Pro Billet dist. Been in the car for about 14 years, started out as a street strip car and now race only. Never once changed the points or had a module go out.
Tim C

I've never had the points go bad on a MSD pro-billet distributor either.......

[DINO1]

I run a digital 6 in my car now, but have had problems in the past with MSD, unless you are running a power adder it is not worth the $$$ for 3 or 4 trips to the track.

M-ay
S-uddenly
D-ie

Nice features are, spark retard, ability to pull timing out per pounds of boost or for N20, start retard for locked out dizzies, rev limiters, ability to pull timming out in high gear for more torque on the big end. And on the high end of things, the ability to taylor timming to each individual cylinder on the digital 7+ boxes.

[Thomasmoto]

Well I do use nitrous, but I think all I'll get is the in-car timing adjuster so I can set the timing from the drivers seat for when I reach to the back seat to open the bottle.
David