Kieran
Posted a lot
Posts: 1,092
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Feb 17, 2015 18:21:06 GMT
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Got the Scimitar SE5a back on the road today.
Is axle tramp normal with enthusiastic acceleration? The shock bushes are new and the mot didn't show up any play in the axle location links?
Also, the car is a pain to start hot. I found the easiest way is to connect another 12v direct to the coil, and then it fires straight up. This is making me think it's today with the coil ballast, but from memory don't they use a 'hot wire' ballast from the rev counter?
Can't remember.
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Last Edit: Feb 17, 2015 19:52:37 GMT by Kieran
The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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Feb 17, 2015 18:57:11 GMT
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Hi, with a ballast ignition the supply from the ignition switch is ballasted to about 6v, when you're cranking 12v is fed from the starter to the coil. If it won't fire under cranking and you feed 12v direct and it fires, then that means the wire from the starter to the coil is either broken or disconnected.
Colin
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Dez
Club Retro Rides Member
And I won't sit down. And I won't shut up. And most of all I will not grow up.
Posts: 11,714
Club RR Member Number: 34
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Feb 17, 2015 18:58:28 GMT
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axle tramp should be pretty much impossible on a scim. knackered shocks?
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Kieran
Posted a lot
Posts: 1,092
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Feb 17, 2015 18:59:40 GMT
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Feels like the tyre is hopping up and down so I guess the shocks are on their  . Starts fine cold or cool, just the hot starts can be a pain. |
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Last Edit: Feb 17, 2015 19:17:40 GMT by Kieran
The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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Feb 17, 2015 19:06:17 GMT
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Hi, does it have electronic ignition? If left for a while to cool does it then start? If so, it could be the ign amplifier breaking down. If not try the coil or the condenser.
Colin
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Last Edit: Feb 17, 2015 19:07:20 GMT by colnerov
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Kieran
Posted a lot
Posts: 1,092
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Feb 17, 2015 19:07:33 GMT
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It has one of those simonbbc points replacement units.
The coil is years old, so yes, it wouldn't hurt it!
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The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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Feb 17, 2015 19:14:25 GMT
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Hi, Aah in that case talk to simonbbc and tell him your problem and ask for a suitable coil, his prices are reasonable, plus he will known if it could be a problem with the unit.
Colin
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Kieran
Posted a lot
Posts: 1,092
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Feb 17, 2015 19:18:30 GMT
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Think the actual unit is fine, it will start, just easier with a direct 12v on the coil!
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The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Feb 17, 2015 19:23:02 GMT
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As colnerov said, first check is the ballast (actually it's a eureka wire on the 5 series) bypass wire from starter to coil - it gets cooked by the exhaust and cracks or just falls off the spade connector. coils generally get steadily worse at hot starting until you get rough running when hot.
you should only get axle tramp on a standard GTE going hard off the line, time for shocks & springs.
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Kieran
Posted a lot
Posts: 1,092
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Feb 17, 2015 20:10:20 GMT
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Yes, that's it, the eureka wire.
Can this be changed for a normal ballast?
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The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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taurus
Posted a lot
Posts: 1,084
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Feb 17, 2015 22:08:32 GMT
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I don't know the Scimitar wiring but usually all you need to do is to fit a normal 12v coil and supply it with an ignition controlled 12v supply. All the ballast does is to drop the usual supply to the coil down to 6v, which is bypassed on starting to give the coil a full 12v supply - since the coil is temporarily overpowered you get nice fat sparks.By the sounds of it your 12v supply to the coil on startup may need checking out as if it's firing with a separate 12v supply that's all it should be getting anyway.
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Feb 17, 2015 22:43:30 GMT
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All the ballast does is to drop the usual supply to the coil down to 6v, which is bypassed on starting to give the coil a full 12v supply - since the coil is temporarily overpowered you get nice fat sparks. sort of - the coil isn't "overpowered", the starter pulls so much current that by bypassing the eureka/ballast circuit during cranking, you actually get approximately normal operating voltage to the coil. |
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scimjim
Club Retro Rides Member
Posts: 1,503
Club RR Member Number: 8
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Feb 17, 2015 22:44:52 GMT
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Yes, that's it, the eureka wire. Can this be changed for a normal ballast? yes - but there's nothing wrong with the eureka circuit if it's running okay. Starting goes through the bypass as described. |
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Feb 17, 2015 23:01:41 GMT
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Hi, just occurred to me those simonbbc ignition systems need an ignition switch controlled 12v all the time, not a ballasted supply. But check with him.
Colin
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Kieran
Posted a lot
Posts: 1,092
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Agreed, just funny how it jumps into life when cold!
I think the feed from the starter is the first port of call.
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The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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jayvoa
Part of things
Posts: 229
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Feb 26, 2015 22:41:34 GMT
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I use a similar Accuspark points replacer module gizmo, and had to make sure there was an ignition switched 12v feed. I also had a dodgy one that wouldn't work at all when warm, which I sent back to the manufacturer who confirmed it was faulty.
If it's anything like the Accuspark one it definitely needs a 12v feed.
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oakesy
Part of things
Posts: 305 
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Feb 26, 2015 23:09:04 GMT
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I get a slight bit of tramp when accelerating hard from a standstill and I have new shocks an bushes but my car is under sprung so has a similar effect to yours.
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'66 Scimitar Coupe Straight Six in no Paint
'74 Scimitar GTE in Yellow
'71 Jaguar XJ6 in Blue
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'87 Scimitar Turbo
Previous- '87 Scimitar SS1 Turbo, '75 Triumph Toledo, '86 VW Scirocco, '93 Scimitar Sabre, '85 Scimitar SS1, '76 Scimitar GTE, '71 Scimitar GTE
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Feb 26, 2015 23:17:22 GMT
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Got the Scimitar SE5a back on the road today. Is axle tramp normal with enthusiastic acceleration? The shock bushes are new and the mot didn't show up any play in the axle location links? Also, the car is a pain to start hot. I found the easiest way is to connect another 12v direct to the coil, and then it fires straight up. This is making me think it's today with the coil ballast, but from memory don't they use a 'hot wire' ballast from the rev counter? Can't remember. Have you tried stiffer bushings if there cheap ones then they may be to soft.. If the shocks are worn it will show on the tyres as they will skip when going over a bump causing odd bold spots |
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Kieran
Posted a lot
Posts: 1,092
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Feb 27, 2015 18:06:49 GMT
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Yeah, I'm thinking of baggy shocks, combined with hard / old tyres.
Had the meter on the coil. Getting 12volts constantly at the coil, so no ballast / eureka wire in use.
I think the battery is on it's way out and I'm seeing the voltage being dragged right down as it cranks, hence the better starting with direct 12volts applied to the coil.
A new coil won't hurt things so I'll order one from Simonbbc to match the power spark unit.
Cheers
Kieran
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The Ashby Jackson fleet:-
1979 Mini Clubman 1.8 K series
1978 Skoda 110r Project 130RS K-oupe
1978 Austin Allegro 1500 SDL Estate
1984 BMW K100 Sidecar outfit
1999 Yamaha FZS 1000 Fazer
1991 Kawasaki ZXR400 race bike
2002 Kawasaki ZX9r race bike
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Feb 27, 2015 19:23:56 GMT
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Wheel hop is quite complex and is actually a resonance in the entire drive train; it's not helped by weak dampers and soft bushes but that's not the only problem. You might well find that the engine mounts and gearbox mount are a bit soft or loose. I solved it on the MG, which has a fully rose jointed four link axle and brand new AVO coilovers, by tightening the engine and gearbox mounts and adding an engine steady bar.
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V8 MGB GT sprint and track
V8 Ford Pilot Woodie project
1971 Early Bay VW camper
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