haapanen@watdcsu.UUCP (Tom Haapanen [DCS]) (11/09/85)
As well all know (since we read net.auto.tech, right?), a spark plug has an end shaped something like the diagram below: |---------------\ |-------------\ \ gap --> _____ \ \ | | \ \ | | | | | | | | Well, how about this design? I found one of these just last night. Anybody seen it before? gap | | v |----| |---------------\ | | |-------------\ \ | | \ \ | | \ \ | | | | | | | | Where I found this was on my new (!) 1956 Porsche 356A 1600 engine. I was disassembling it, and pulled the spark plugs to examine them. I took me about three looks before I actually figured out why the plugs didn't look right. Is this what all plugs used to look like 30 years ago or is this specifically a Porsche plug (they're made by Bosch). \tom haapanen watmath!watdcsu!haapanen Im all lost in the Supermarket I can no longer shop happily I came in here for that special offer Guaranteed personality (c) The Clash, 1979
bl@hplabsb.UUCP (11/13/85)
> > As well all know (since we read net.auto.tech, right?), a spark plug > has an end shaped something like the diagram below: > > > |---------------\ > |-------------\ \ > gap --> _____ \ \ > | | \ \ > | | | | > | | | | > > Well, how about this design? I found one of these just last night. > Anybody seen it before? > > gap > | > | > v > > |----| |---------------\ > | | |-------------\ \ > | | \ \ > | | \ \ > | | | | > | | | | > > Where I found this was on my new (!) 1956 Porsche 356A 1600 engine. I > was disassembling it, and pulled the spark plugs to examine them. I > took me about three looks before I actually figured out why the plugs > didn't look right. Is this what all plugs used to look like 30 years > ago or is this specifically a Porsche plug (they're made by Bosch). Plugs like these have been used in nearly every piston powered airplane ever built.
davidsen@steinmetz.UUCP (Davidsen) (11/14/85)
In article <3163@hplabsb.UUCP> bl@hplabsb.UUCP writes: > > As well all know (since we read net.auto.tech, right?), a spark plug > has an end shaped something like the diagram below: --- diagram deleted --- > > Well, how about this design? I found one of these just last night. > Anybody seen it before? > --- 'nother diagram deleted --- We used to reshape conventional plugs to have that style gap in some of the drag race cars I used to run... seems that the piston came up enough to close the gap on the conventional design. Someone used to make (may still) a plug with a center electrode and a ring around it, which fires on the surface of the insulator. Perhaps someone in the net can recall the maker(s?) and knows if they are still in business. I confess that I never found any performance difference, except that I got rid of my problem with misfire after high rpm (and I didn't have to regap the plugs after every run). -- billD (..seismo!rochester!steinmetz!crdos1!davidsen) (davidsen@GE-CRD.ARPA) "It seemed like a good idea at the time..."