Edited by ChevLX_77, 09 May 2007 - 08:31 PM.
MSD for Holden 6?
#1 _ChevLX_77_
Posted 09 May 2007 - 08:30 PM
#2 _dave720gtr_
Posted 09 May 2007 - 10:25 PM
what u do is use a msd 6 or 7 with a holden vk electronic dizzy with the modual gutts removed as the msd has all this built into it ,,
#3 _SableMet7/73_
Posted 09 May 2007 - 10:34 PM
monaro for 7/8 years(350 & rockcrusher) and has been totally reliable
starts 1st time every time(after oil pressure's up). Only thing is that being
a CDI (capacitive discharge ignition) if you are running less than a fully
charged battery, engine will cut out thru loss of ignition, specially if you
turn the radio or lights on. They require a good 12volt source to energise
the capacitor banks and the primary ignition circuit, my Suzuki RG500
is also CDI and being a 2 stroke requires a good battery for the CDI,
power valve controler and lights. If the battery is slightly dodgy then
the engine wont rev cleanly thru the power band.
Havnt really answered your question but hope the info helps avoid some
minor pitfalls Ive experienced with CDI ignitions
cheers Jono
#4 _Bomber Watson_
Posted 10 May 2007 - 01:42 PM
#5 _dave720gtr_
Posted 10 May 2007 - 05:57 PM
#6
Posted 10 May 2007 - 06:44 PM
#7 _ChevLX_77_
Posted 10 May 2007 - 07:29 PM
VK dizzy that is but its locked and regraphed to suit nitrous
Edited by ChevLX_77, 10 May 2007 - 07:32 PM.
#8 _levis_
Posted 10 May 2007 - 07:54 PM
#9 _Bomber Watson_
Posted 10 May 2007 - 08:10 PM
ALSO, when i was talking ignition systems with my engine man the vk dizzie missfire problem was the first thing he brought up.
call me what you want, results are results, i run a vk dizzy now in a very mild motor and would put one in anything up to around xu-1 speck after that no way.
and heath dont be a cock head mate, everyone knows a lot of things. the things that work most people dont know.
Edited by Bomber Watson, 10 May 2007 - 08:12 PM.
#10 _dave720gtr_
Posted 10 May 2007 - 09:59 PM
#11 _why-psi_
Posted 11 May 2007 - 09:59 AM
did he take out the resistor to supply 12 volts to the electronic dizzy instead of the 9 volts which points dizzys run onok guys the bloke im talking about is this local boy with a turbo holden six runs 10's, no shit changed dizzys and ran faster. also some other mates of mine had a weird missfire, tried two diferent vk dizzies same problem put points one back in and problem solved.
ALSO, when i was talking ignition systems with my engine man the vk dizzie missfire problem was the first thing he brought up.
call me what you want, results are results, i run a vk dizzy now in a very mild motor and would put one in anything up to around xu-1 speck after that no way.
and heath dont be a cock head mate, everyone knows a lot of things. the things that work most people dont know.
#12 _dave720gtr_
Posted 11 May 2007 - 11:11 AM
on old holdens that run points the green wire is resisted to 9v when you wire up msd and or just a vk dizzy you must splice into the pink wire under the dash or find a other source of 12v for them to run off ..
Edited by dave720gtr, 11 May 2007 - 11:15 AM.
#13
Posted 11 May 2007 - 11:34 AM
I think you mis-interpretted my post DJ. I meant that everyone knows a VK dizzy is considered a superior choice. I wasn't trying to be a smartarse. I'm just confused because everyone seems to think that they're better and a performance motor has to be an electronic job.and heath dont be a cock head mate, everyone knows a lot of things. the things that work most people dont know.
Also, I presume there are a lot of things that can go wrong with any distributor. Are you sure that this particular VK distributor didn't have any existing problems?
#14 _devilsadvocate_
Posted 11 May 2007 - 12:58 PM
There are distributor test rigs that should be able to spin things up to the rev range where the "harmonics" are occuring and problems identified. What sort of rpm are you talking about anyway Bomber?
#15
Posted 11 May 2007 - 02:46 PM
I thought both these dissys were similar?just to clarify, this distributor is the same as the one fitted to vh 6cyl, or its the efi version for the vk?
#16
Posted 11 May 2007 - 03:06 PM
didn't the EFI have the same dizzy as the VH and the carb model had EST?I thought both these dissys were similar?just to clarify, this distributor is the same as the one fitted to vh 6cyl, or its the efi version for the vk?
#17
Posted 11 May 2007 - 04:09 PM
Thats what I think too, though the efi dissy has a different advance curve from what I have read.didn't the EFI have the same dizzy as the VH and the carb model had EST?I thought both these dissys were similar?just to clarify, this distributor is the same as the one fitted to vh 6cyl, or its the efi version for the vk?
Both fairchild module triggered though.
#18
Posted 11 May 2007 - 10:53 PM
#19 _82911_
Posted 11 May 2007 - 11:04 PM
Mr Watson is right. They do have a harmonic induced problem at hi rpm.
Yes it can cause misfire. YES IT CAN BE OVERCOME...
Dave 720 is also right... the green (factory wire) is resiste and should be bypassed on an electronic ign dizzy setup.
Heath is also wise to the ways of the gremlins... It is right to presume that if you change the dizzy and it cures the problem. Then YES the dizzy was the problem.. BUT does it mean that the design of the dizzy is faulty???
I THINK NOT.....
BTW...Orange LJ, your old man is right (again).....
MSD box only needs to get a signal from an external triggering device to give a spark.That device could be points or a hall effect trigger or a reluctor (flying magnet).
Cheers Greg..
Edited by 82911, 11 May 2007 - 11:07 PM.
#20
Posted 12 May 2007 - 02:10 AM
Isn't this why the V8 fairchild dissys had the bigger cap? Possible?
#21 _devilsadvocate_
Posted 12 May 2007 - 07:01 PM
Possibly. Just thought they increased the diameter to achieve more or less the same spacing b/w terminals as a six to stop any crossfire /shortsprobs with adjacent terminals due to hei etcI wonder at what RPM would a standard and/or statically advanced VH (for reference) dissy start to "jump spark" to the next advanced cap post.
Isn't this why the V8 fairchild dissys had the bigger cap? Possible?
#22 _Drag lc_
Posted 12 May 2007 - 11:35 PM
Thanks Hayden
#23
Posted 13 May 2007 - 12:13 AM
we are aware of the harmonics now.
Can you explain the harmonic problem?
Tonight I have been assembling the dash for my Commodore and noticed that the tacho (standard Commodore) redlines at 5800rpm which is in the zone of your problem.
Edited by rodomo, 13 May 2007 - 12:19 AM.
#24 _why-psi_
Posted 13 May 2007 - 12:30 AM
#25 _dave720gtr_
Posted 13 May 2007 - 12:32 AM
i have never had a prob with one miss fire like that and we spinn my mates to 7000 rpm on a standed vk dizzy no msd ! strange ! 82911 would no how to over come the harmonic prob !or ice
cheers
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