40 replies to this topic

[HUBBA.HUBBA]

Because it relies on a cam driven by a timing chain so you get chain stretch and you get wear on the dizzy drive gears

Well, if the chain is good enough to open and shut my valves in a timely manner then thats good enough for me. In reality, I wouldn't be supprised if you could never tell the difference between megajolt and amethyst.

I doubt that unless your car is used for racing, sprints or hill-climbs you would notice the difference between Megajolt and points ignition. The advantage for most owners with any sort of electronic ignition is that the points don't need adjusting every few miles.
If a points-equipped 1293 'S' with an Aldon custom-curved distributor costing £100 will do, say, 0 - 60 in 7.4 seconds, how much quicker would it be with a) Amethyst and b) Megajolt? Does anyone know or care to guess?

The main reason i want it is to control the advance better for my s/c (at high and low revs - stop stalling at low and possible detonation at high) aldon custom curve doesn't quite hit the button.

[HUBBA.HUBBA]

Except the Megajolt can be used on just about any type of engine.........

I'll be sticking with one of those A series engines

[Cooperman]

Because it relies on a cam driven by a timing chain so you get chain stretch and you get wear on the dizzy drive gears

Well, if the chain is good enough to open and shut my valves in a timely manner then thats good enough for me. In reality, I wouldn't be supprised if you could never tell the difference between megajolt and amethyst.

I doubt that unless your car is used for racing, sprints or hill-climbs you would notice the difference between Megajolt and points ignition. The advantage for most owners with any sort of electronic ignition is that the points don't need adjusting every few miles.
If a points-equipped 1293 'S' with an Aldon custom-curved distributor costing £100 will do, say, 0 - 60 in 7.4 seconds, how much quicker would it be with a) Amethyst and b) Megajolt? Does anyone know or care to guess?

The main reason i want it is to control the advance better for my s/c (at high and low revs - stop stalling at low and possible detonation at high) aldon custom curve doesn't quite hit the button.

I had to re-build a 1293 Turbo engine which had done 4 miles from new-build (not my me!) before it blew up. The guy had paid cash - no questions - so the builder didn't want to know. It had a standard 1275 Mini distributor and a static C.R. of 15:1. It blew up!
When I re-built it I made the owner get the turbo set with a certificate of boost and Aldon did a special distributor which had the correct curve and it worked fine. No detonation and on the rolling road it performed very well. I guess an Amethyst system would have been ideal had it been available then.

[HUBBA.HUBBA]

Because it relies on a cam driven by a timing chain so you get chain stretch and you get wear on the dizzy drive gears

Well, if the chain is good enough to open and shut my valves in a timely manner then thats good enough for me. In reality, I wouldn't be supprised if you could never tell the difference between megajolt and amethyst.

I doubt that unless your car is used for racing, sprints or hill-climbs you would notice the difference between Megajolt and points ignition. The advantage for most owners with any sort of electronic ignition is that the points don't need adjusting every few miles.
If a points-equipped 1293 'S' with an Aldon custom-curved distributor costing £100 will do, say, 0 - 60 in 7.4 seconds, how much quicker would it be with a) Amethyst and b) Megajolt? Does anyone know or care to guess?

The main reason i want it is to control the advance better for my s/c (at high and low revs - stop stalling at low and possible detonation at high) aldon custom curve doesn't quite hit the button.

I had to re-build a 1293 Turbo engine which had done 4 miles from new-build (not my me!) before it blew up. The guy had paid cash - no questions - so the builder didn't want to know. It had a standard 1275 Mini distributor and a static C.R. of 15:1. It blew up!
When I re-built it I made the owner get the turbo set with a certificate of boost and Aldon did a special distributor which had the correct curve and it worked fine. No detonation and on the rolling road it performed very well. I guess an Amethyst system would have been ideal had it been available then.

15:1 ? bloody hell !

[Gr4h4m]

I think it would be a good option for n/a cars. I presume they have done something about them stopping in the wet.. Tis a good idea as you can change the engine in the future and re-map the dizzy.

To keep it balanced remember mj does more that just your timing... As it has inputs and outputs

[Gr4h4m]

That was my point?

[Gr4h4m]

Well I had a search doesn't appear to be on the website, which is a shame it would be good to compare features.

[l_jonez]

Yep I can't seem to find any thing about it online, it would be nice to see the specs.

[DannyTip]

No specs yet. But i guess they will appear when its released at the end of the month.

[Pigeonto]

There'd still be a little maintenance by way of the rotor arm and cap,perhaps a drop of oil for the top spindle bush. No one has mentioned the rev limiter on megajolt,just wondering if this will feature it. 1/2 the reason I went to Megajolt was that I conked out in the rain one day with dizzy and said never again so I hope they have addressed that,although if its a Lucas body it will still have a standard cap A good idea though and it will sell well, doubtless.

[DannyTip]

I was wondering does it even have a rotor arm? How would/could it adjust the advance if it did?

[DannyTip]

I understand that dillgaf but doesn't the rotor arm have to be in a different position to fire the spark earlier/later? Or does the rotor arm width account for a few degrees each way?

Edit: Forget that :)

Edited by DannyTip, 10 September 2012 - 05:09 PM.

[jakejakejake1]

Could this work by having what is essentially a normal distributor, with no mechanical or vacuum advance.
Thus a fixed advance at all rpm, then introducing an actuator that could advance/ retard the ignition by turning the backplate/ rotor arm relative to the shaft.
Or having the rotor completely separate from the shaft, and having a motor or something that could rotate the rotor arm correctly to provide the proper advance.
Or you could have no rotor arm at all, just a sensor that detects the position of the shaft, and an electronic module/relay that fires a spark to the correct HT at the right time.

The more you think about it the more interesting it becomes, trying to work out a reliable way of achieving it...

And to answer Danny's question directly, you would have to adjust the position of the rotor with regards to the shaft, but as they are both spinning quite fast this could be a problem, and I cant really see them using this way as it is too much hassle compared to the other ways of achieving the same thing, as you would need something that would be mounted on the shaft, that could rotate with it, while receiving information about what the advance should be.

[seb79]

Great new after 123 and CSI dizzies... for business.... lol

but megajolt offer better advantages...


Try again...

[Klevdo2202]

Anybody know when this is being released? I've contacted them twice now, no reply....want to get my hands on one of these!