wally05 Posted June 5, 2005 Report Posted June 5, 2005 Haha, I was going through some car stuff from when I had my '87 Camaro and I found these Platinum +4 plugs (pn 4418, exact fit for my Quad 4), I remember buying four of them for some reason off a guy who used them for one lap around the track to compare plugs. Well, I was thinking about sticking them in my Cutty, but I've heard bad things about them (reason why I didn't use them after I bought them). Are Bosch plugs more liable to foul? Would they be ok to stick in my Cutty? Technically, they are free (bought them about a year ago for like $2 a piece since they were used for that one lap), so I thought "might as well." Korey Quote
mihela816 Posted June 5, 2005 Report Posted June 5, 2005 The waste spark system our cars use fires the plugs backwards on the exhaust stroke, wearing the Bosch plugs out very quickly. Quote
GP1138 Posted June 5, 2005 Report Posted June 5, 2005 Didn't we just have this conversation in another thread?? Quote
mihela816 Posted June 5, 2005 Report Posted June 5, 2005 We have this conversation all the time. Its like a bad movie played over and over again. Quote
wally05 Posted June 5, 2005 Author Report Posted June 5, 2005 Then don't post. I've researched it, but just thought I'd ask. Thanx, Mihela. Korey Quote
Brian P Posted June 5, 2005 Report Posted June 5, 2005 No good. Anything but Bosch. Someone wasn't thinking at my job and put the basic Bosch plugs in a '98 Lesabre back in January. I was talking to the owner today and he mentioned how his average fuel economy dropped 4mpg since the tuneup. I looked his history and saw those plugs on the list. Problem solved. Quote
wally05 Posted June 6, 2005 Author Report Posted June 6, 2005 K, then I'm not using these. Anyone want these Bosch Plugs? lol Korey Quote
joey b Posted June 7, 2005 Report Posted June 7, 2005 it doesn't hurt to use them, but they definately aren't worth the money though. If you have the money though, go buy some delcos. Quote
maybe2fast Posted June 7, 2005 Report Posted June 7, 2005 I am not a Bosch fan but I had the 4's in the Lumina and I never noticed any difference in performance but they worked fine. I had bosch 1's in my GF's Escort and 1000-2000 miles went by and they were shit! (missing like crazy)I threw in some Autolites and everything was fine Quote
CuttySup Posted June 7, 2005 Report Posted June 7, 2005 I've heard that the four tips eventually melt together. Quote
GnatGoSplat Posted June 7, 2005 Report Posted June 7, 2005 The waste spark system our cars use fires the plugs backwards on the exhaust stroke, wearing the Bosch plugs out very quickly. They don't really wear out due to the waste spark, but how waste spark is wired. 3 plugs ALWAYS fire in reverse polarity and 3 plugs ALWAYS fire in normal polarity. This is because the 2 plugs on a coil are wired in a series. If for example, 1 coil makes 80,000 volts and Ground is 0V, then one plug's center electrode sees -40,000 volts and the other sees +40,000 volts. The plug that always gets the negative voltage will eat away the Bosch's tiny center electrode. Quote
Donutboy97 Posted June 7, 2005 Report Posted June 7, 2005 I had them in my old Monte (3100) and had no problems with them. After 30,000 miles they still looked great. I have heard though that some people were having problems with them in the 3.4 DOHC motors. Quote
White93z34 Posted June 7, 2005 Report Posted June 7, 2005 consider that the 3.4 dohc is supposedly harder on plugs then its pushrod counterparts, so i'd imagine with the 3.4 any problems with bosch and waste spark would have would just be amplified. Quote
GnatGoSplat Posted June 7, 2005 Report Posted June 7, 2005 When I ran Bosch in my 2.8, the tiny center electrodes got eaten up in 10k miles or so on 3 plugs. Quote
Redwingvksm Posted June 8, 2005 Report Posted June 8, 2005 Waste spark style GM uses. Not just on 3.4 - on all of them...(engines) Quote
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