| [ Total Views: 1317 | Total Replies: 17 | Thread Id: 29603 ] |
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 fetid_swamp
Seriously Crusin Dubber
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| posted on October 5th, 2004 at 11:31 AM |
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gt40 coil & compufire ???
its prob been answered 100 times before but i didnt find it in a quick search so:
is a compufire ok with a gt40 coil. ??????
thanks anyone...
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Anthiron
A.k.a.: Nicko McKay
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| posted on October 5th, 2004 at 12:06 PM |
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i think i heard somewhere that u would have to use a standard coil as the GT40 gets to hot but i could be wrong. someone else will know
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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 Bizarre
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| posted on October 5th, 2004 at 12:22 PM |
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Hmmm... i cant remember now - but there IS a difference.
When i put my Magfire in it said you wanted a coil with
a) 1 ohm
b) 3.5 ohm
resistance.
Buggered if i can remember which one it was :jesus
Futue te ipsum!!!
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fetid_swamp
Seriously Crusin Dubber
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| posted on October 5th, 2004 at 01:25 PM |
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hokay then, another qu.
how many ohms resistance is a gt40 or which terminals do i use to measure its resistance.
do i go across the + & - or do i involve the HV dizzy lead somehow???
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Bizarre
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| posted on October 5th, 2004 at 03:05 PM |
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straight across the pos and neg
Futue te ipsum!!!
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fetid_swamp
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| posted on October 5th, 2004 at 03:21 PM |
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I will check it & advise. thanx.
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fetid_swamp
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| posted on October 5th, 2004 at 07:27 PM |
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gt40 will be no good.
it says i need a high impedance (resistance) coil of 3-5 ohms not one of 1 or less ohms.
just tested it and the gt40 has a 1 ohm resistance.
so anyone have any ideas on an appropriate replacement??
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Bizarre
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| posted on October 5th, 2004 at 08:05 PM |
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yeah - the BLACK bosch coil
NOT the standard Blue Coil
Once upon a time so,e one posted here that they worcked for Bosch and the different coils were resistance related
Blue - points
Black - electronic
I think the serial is SE 12
Futue te ipsum!!!
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Bizarre
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| posted on October 5th, 2004 at 08:15 PM |
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yep - Its a SU 12
Black and is 3.5 ohms
I just measured it
Futue te ipsum!!!
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manx020
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| posted on October 5th, 2004 at 08:32 PM |
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i have been using a 009/compufire combo with a bosch gt40 12volt coil for years with no problems.
cheers,
rick
[url]=http://www.manxclub.org]  [/url] |
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fetid_swamp
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| posted on October 5th, 2004 at 08:40 PM |
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thanks all.
i think i will still get a high resistance coil in my next order from a forum sponser as it's better safe than sorry and i can keep the gt40 with the
points and condenser in the spares kit to cover any electrical fry action far from home.
[Edited on 5-10-2004 by fetid_swamp]
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Baja Wes
Bishop of Volkswagenism
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| posted on October 6th, 2004 at 12:55 PM |
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I had a compufire equivalent (magnafire?). First I ran it with a GT40R, but it overheated after 20min of driving and stopped. was ok once cooled down.
The GT40R is meant for cars with a ballast resistor.
I then went to a GT40. Never had a problem since then. (eventually sold that motor).
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68AutoBug
A.k.a.: Lee Noonan
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| posted on October 6th, 2004 at 02:53 PM |
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A Sports coil such as the GT40 - draw substantially More current than a standard ignition coil...
to obtain their higher output voltage.. which can result in overheating...
It may depend on where the coil is situated , such as under a closed engine lid [without vents]
... or under a late model engine lid with vents - or open at top etc.. or Baja...
Lee
[Edited on 6-10-2004 by 68AutoBug]
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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fetid_swamp
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| posted on October 7th, 2004 at 09:59 AM |
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hokay,
what about this:
http://huelsmann.us/bugman/RotorTech.html
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mnsKmobi
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| posted on October 7th, 2004 at 11:45 AM |
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What do you want to know? Removing the resistor in the rotor is supposed to be required if you have a high output ignition such as a CDI. Otherwise
the resistor overheats and stops conducting.
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Anthiron
A.k.a.: Nicko McKay
Compulsive Aussie Vee Dubber
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| posted on October 7th, 2004 at 11:47 AM |
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can you not just buy a rotor with a bigger resistor? you would think they would manufacture something if this was a standard problem.
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
1970 MK2 Ford Cortina GT
1979 Yamaha RX125 Two Stroke tracker project.
2004 Harley Davidson Sportster XL Custom
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fetid_swamp
Seriously Crusin Dubber
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| posted on October 7th, 2004 at 12:07 PM |
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| Quote: | Originally
posted by mnsKmobi
What do you want to know? Removing the resistor in the rotor is supposed to be required if you have a high output ignition such as a CDI. Otherwise
the resistor overheats and stops conducting.
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cool. so the resistor in the rotor is not something we need to worry about if only going to a compufire and not a full blown CDI system.
Thanks
thanks
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68AutoBug
A.k.a.: Lee Noonan
Aircooled Master
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| posted on October 7th, 2004 at 09:36 PM |
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A None burnout Rotor button...
Good job,
that rotor won't burn out...
I did buy a new rotor without the resistor from the US..
Was more than double the price of the original VW rotor..
Everyone should carry one of these for a spare...
especially if You have a High Energy electronic ignition system..
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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68AutoBug
A.k.a.: Lee Noonan
Aircooled Master
Beetle Restorer - Experience over 138% - YIKES --
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| posted on October 7th, 2004 at 11:42 PM |
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A local had one burn out a few months ago...
Had to be towed home....
His father found the problem...
The rotor burnt out while being driven...
so, it can happen....
PS. I do believe there is a replacement rotor from a different car that does fit the Air Cooled VWs distributors...
with NO resistor....
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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Grey 57
A.k.a.: Dean
Son of Jim - Creator of Good
Old Grey Cruiser
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| posted on October 9th, 2004 at 08:26 AM |
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I fitted a compufire unit into my old oval fitted with 1600 SP. The standard Bosch Black coil died in a very short time. It has to do with the
duration of dwell. Perfect with a hall cell. I.e. the points (hall cell) are on (closed) a longer time between opening. This cased the standard coil
to over heat.
Changed to a Bosch electronic coil (non ballast resist) and had no more problems.
The Compufire unit is money well spent on a VW engine. Starts faster, idles smoother, dunno about extra power never checked it on a dyno. Saves
pissing about with points every 3000ks too.
[Edited on 8-10-2004 by Grey 57]
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