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Rather OT - Volvo HT coils

I had the lid off the 960 today and discovered that each spark plug has its own HT coil. They are a sort of big lumpy plug cap, all encapsulated as you'd expect in this day and age and neatly bolted to the cam box.

Very nice too and they must lead a hard, hot life in such a place. It occurred to me that this information might be very interesting to anyone here wondering how to replace HT components that are long out of date, as they seem long lived and now available in a scrapyard near you ;o))

Regards,

Kim Siddorn

Man is an ape with possibilities ...

Reply to
Kim Siddorn
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Didn't Saab lead the way with these on the 1980s?

Tom

Reply to
Tom

Tom wrote

Dunno Tom, never had a thing to do with Saabs - wouldn't surprise me though, they are a go-ahead lot in Sweden ;o))

Regards,

Kim

Reply to
Kim Siddorn

I think it was GM, and Saab got it from them.

They were certainly around in '83 - I had them on my Renault 17 engine (an 843 ? Much the same as the Lotus Europa, but with Bosch injection), as part of a slightly dubious home-brew digitally mapped ignition system based on single CMOS chips and an EPROM with the map in it.

A later version appeared on my Lancia Montecarlo with the silly compression pistons. I had to tweak the map before thrashing it, or else the plugs melted. Had to use platinums to get it to work right in the end.

Reply to
Andy Dingley

Yes, they had the first setup for a commercial car with separate coils for each cylinder and no distributor.

Peter

Reply to
Peter A Forbes

My sister has a Ford Scorpio Estate, they also use this system. You're right about the 'hard, hot life'. Although the plug/coil seems to be OK, Ford, in their infinite wisdom used cheap pvc LT cables which run across the top of the engine under a trendy looking cover which must mean that they run at about 100 deg. C or more!. The wires lasted about 20K miles before they melted and perished causing mis-firing and/or total failure. Ford *claimed* this was unheard of before and wanted about £200 to replace the loom. I rewired the thing with PTFE wires for a couple of quid and all has been well since.

Regards

Mark

Reply to
Mark Howard

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