taurus
Posted a lot
Posts: 1,084
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I'm a traditional kind of guy and I'm trying not to let that prejudice me against modern innovations - but recently I've had two of our family fleet play up and both times it was down to the spark plugs. In both cases they'd had Bosch multi-tip plugs fitted 9,000 miles ago. Changed them back to the good old single tips and problem solved.
Now I know new plugs will always make a car run better - but plugs these days ought to last longer than 9,000 miles. The whole point of multi-tips is extended life isn't it?
(I'm talking 90's small engined cars, nothing fast or fancy. Shouldn't be eating plugs at that rate.)
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shin2chin
Part of things
Making curse word cars slightly better
Posts: 820 
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May 13, 2016 13:37:12 GMT
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I've heard a lot of people speak negatively of Bosch Super 4 plugs but I've had the opposite experience. Had a brand new set of oem Beru plugs in my 924 and it ran like curse word. Switched back to the old Bosch and it was sweet. I honestly think it's just they're only beneficial on certain, mainly older engines.
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1977 PORSCHE 2.0na 924
1974 VW Beetle 1600
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bortaf
Posted a lot
Posts: 4,549
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May 13, 2016 13:59:51 GMT
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I've found the multi tips only really work in the right engine, i guess something to do with plug shouding or sumink, in some VWs they are required/recomended in others they foul up  they worked OK in pintos ii've had but not on GM 8v, my nova allways clogged them up as they did in my mates 1.6 cav |
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R.I.P photobucket
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Ryannn
Posted a lot
Posts: 2,423
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May 13, 2016 18:56:37 GMT
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They didn't work in my mini when I tried them, about 8 years ago, never bothered again!
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May 14, 2016 21:22:08 GMT
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Back in the day I got some of the orginal "splitfire" plugs
Took my modified mg metro to hi tech in Cradley Heath for a rolling road session and it just wouldn't run right , flat spots , mixture all over the place
Needles and jets changed no real change
Plugs got dismissed as nearly new ,, but as a last resort the rr operator fitted a set of used ngk plugs and all the issues were sorted!
I've not bothered with fancy plugs since
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May 14, 2016 23:17:04 GMT
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never had an issue with standard spec nkg twin earth In my 16v pugs, plenty cheap enough and never give silly problems.
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Multi-tip plugsDeleted
@Deleted
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May 19, 2016 21:26:59 GMT
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The whole point of multi-tips is extended life isn't it? (I'm talking 90's small engined cars, nothing fast or fancy. Shouldn't be eating plugs at that rate.) No its to do with a more efficient spark but some cars are not suited to them and some cars won't run properly without them. IMO opinion its best to stick with the recommended plug for that car. again depending on car a plug can last from 6k to 50k miles. |
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ChasR
RR Helper
motivation
Posts: 10,309
Club RR Member Number: 170
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Multi-tip plugsChasR
@chasr
Club Retro Rides Member 170
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May 21, 2016 13:03:29 GMT
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What was the car in question that you changed the plugs on?
IMHO only fit what the manufacturer recommends ; ECP and others have got very cheeky and started specifying non platinum plugs for some cars. Great in the short term both from a monetary and servicing perspective but curse word in the long term ; more times to remove the plugs and potentially shortening the life of coilpacks and leads etc.
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taurus
Posted a lot
Posts: 1,084
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May 24, 2016 20:46:46 GMT
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Both were Toyota Yaris - 1999 1.0 litre
The book says to use the multi-tip Bosch plugs in them from 2003 onwards (I think) - so to be fair the engines we have don't specify multi-tips.
I never every buy anything from ECP anyway. I usually get everything from CES but from memory the plugs in question were fitted by someone else.
I was told the point of multi tip plugs is that as one electrode wears one of the others takes over. ie they don't spark all four at once, just the one that is providing the shortest route to earth. The theory being that with four tips it takes a lot more miles before all four electrodes wear beyond optimum spark distance.
They run fine on them for about 9k, then they start misfiring. My guess is that the first tip has worn to the point where there are two tips equal distance so they are making 2 weak sparks instead of one fat one. Just a guess - but I'm sticking to single tips in future and changing them more frequently.
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May 26, 2016 11:10:57 GMT
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Both were Toyota Yaris - 1999 1.0 litre The book says to use the multi-tip Bosch plugs in them from 2003 onwards (I think) - so to be fair the engines we have don't specify multi-tips. I never every buy anything from ECP anyway. I usually get everything from CES but from memory the plugs in question were fitted by someone else. I was told the point of multi tip plugs is that as one electrode wears one of the others takes over. ie they don't spark all four at once, just the one that is providing the shortest route to earth. The theory being that with four tips it takes a lot more miles before all four electrodes wear beyond optimum spark distance. They run fine on them for about 9k, then they start misfiring. My guess is that the first tip has worn to the point where there are two tips equal distance so they are making 2 weak sparks instead of one fat one. Just a guess - but I'm sticking to single tips in future and changing them more frequently. Funny enough my partners Yaris had starting problems so I changed the spark plugs, set of 4 standard NGK's from Halfords on Trade were £9.50. Car has been fine since, touch wood! |
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Last Edit: May 26, 2016 11:12:33 GMT by mgbizzle
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they worked OK in pintos ii've had but not on GM 8v, my nova allways clogged them up as they did in my mates 1.6 cav 
