Technical bosch super 4 510 sparks

[SamuraiDragon]

i picked up set of the super 4 sparks and apparently the 510's are to fit my 1.2 16v.... but the thread seems to be bigger than the ngk's i have fitted currently.... am i being thick? do they make 2 different sized threads for the 510's or do they just not fit? please help....

 

[david295]

If the thread is bigger, i honestly can not see it threading in the hole, take one out and try it, but do not tighten to tight incase you strip thread, if dont fit, take them back, i paid £9 for a set of 4 spark ones from halfrauds.

 

[SamuraiDragon]

it wouldnt thread in, only then did i notice there is like 1mm difference between them. its not much but enough to stop it from fitting. wasnt sure if anyone else had the same issue before. would have got ngk's but they didnt have any.

 

[SamuraiDragon]

while im thinking of it, the old plugs thread seemed to be quite dry and stiff... is using copper grease a good idea on them when i replace the plugs or would it affect the plugs?

 

[david295]

I used copper grease on mine before I put new ones in, just put it on thread.

 

[ST60SX]

Different thread, as in the new plugs are slightly longer? This is probably fine. If the thread pitch is different (the distance between each of the 'peaks' on the thread), you shouldn't use them.

Regarding grease: No. Do not use grease or any lubricant under any circumstances. There are two reasons;

1) The threads are more than likely Nickel plated. This means they shouldn't seize or corrode on the threads anyway.
2) The torque settings specified are for DRY threads. Greasing the thread decreases the amount of effort needed to screw the plug in/out but it does not reduce the total axial force on the plug. In simple terms, you could end up over-tightening the plug (although you wouldn't notice) and could strip the thread in the head.

 

[SamuraiDragon]

the actual width of the threaded part is bigger, they are still 10mm plugs etc, but didnt seem to fit and didnt want to put any more pressure on to try get them in.

 

[ST60SX]

I think you have the wrong plugs. Is the code on the plug FR78X?

The ones for 16V engine is YR78X I believe.

 

[SamuraiDragon]

I think you have the wrong plugs. Is the code on the plug FR78X?

The ones for 16V engine is YR78X I believe.

yup, that seems about right. will take them back to halfords tomorra and complain cos it dont give the different codes in their booklet guide.

 

[SamuraiDragon]

took the plugs back and found an idiot (sorry, i mean member of staff) who managed to get hold of some ngk's for me instead. problem sorted.

 

[Mr Wild]

I wouldn't buy these to be honest, they're a gimmick. Only one of the electrodes fires anyway, and you still get the same degredation on the centre electrode that you would on a standard spark plug.

I experienced misfiring when using them.

 

[Ziggy122]

Im with mr.wild here
sure it sorta a false garentee really, if it don't spark well enough - there is a problem else where to be honest

I'd be investigating more to why you didnt have a good sprak

NGK / Fiat seem to be the best and recommend most

Ziggy