E30 Zone

whats the preffered choice on plugs ??

Bosch W8LCR @ £5 odd each

NGK ZGR5A @ £11 FOR 6

or theres these bosch at £15 for the 6 ?

or the BPR6ES @ £15 for the 6 (which ive heard as lot on here, would they be the best ?

then theres a few densos going up to £60 odd !

Always NGK BPR6ES

why on some websites does it list BPR6ES for 318 etc but not m20 325i and gives the others instead ? are they preffered due to being the best or because they are cheaper ?

Earlier M20 B25 engines used the ZGR5A, and then I believe the switch was made to BPR6ES.

allways used to ask for an old plug when supplying new ones to see if the plug was suited to the engine , most performance engines use this method. to get the correct burn

Grrrmachine wrote:http://www.e30zone.net/e30zonewiki/inde ... park_Plugs

conflicts with -

HJG-E30 wrote:Earlier M20 B25 engines used the ZGR5A, and then I believe the switch was made to BPR6ES.

the zgr5a, are whats currently in the engine, so should i get these ?

polsta wrote:

Grrrmachine wrote:http://www.e30zone.net/e30zonewiki/inde ... park_Plugs

conflicts with -

HJG-E30 wrote:Earlier M20 B25 engines used the ZGR5A, and then I believe the switch was made to BPR6ES.

the zgr5a, are whats currently in the engine, so should i get these ?

Where's the conflict? Both are recommending the BPR6ES.

There's no helping some people.

My understanding is Bosch were the supplier to BMW when these cars were new. NGK ZGR5A were available as replacements. The later M20 still came with Bosch plugs and the NGK BPR6ES were available as replacements.

ETA:

My Autodata software lists NGK BPR6ES (OE = Bosch W7DCR) for all M20B25 engines regardless of build date With ONE exception:

Engine Code 25 6K 1/A tuned for R-Cat (1986 - 1993) Bosch W8LCR as OE. NGK = ZGR5A

So engines produced between '86 and '93, but only those with cats, are recommended to run the ZGR5A plugs. However I think it is well known enough that the BPR6ES will run on any standard M20B25

mine is the earlier engine, so should i go with the BPR6ES, W8LCR OR ZGR5A ? they are all available

I've realised my earlier post said earlier engines used the ZGR5A. I got this the wrong way round, so use BPR6ES. Autodata confirms this.

Some people experience issues with Bosch plugs, in terms of misfires and durability. Personally, I believe NGK are the best plug manufactures.

I think we can safely say that BPR6ES will do you!

My motor is the same as yours Polsta and I've had the same set of NGK bpr6es in there for over 3 years and about 35k kms. No problems.

HJG-E30 wrote:My understanding is Bosch were the supplier to BMW when these cars were new. NGK ZGR5A were available as replacements. The later M20 still came with Bosch plugs and the NGK BPR6ES were available as replacements.

ETA:

My Autodata software lists NGK BPR6ES (OE = Bosch W7DCR) for all M20B25 engines regardless of build date With ONE exception:

Engine Code 25 6K 1/A tuned for R-Cat (1986 - 1993) Bosch W8LCR as OE. NGK = ZGR5A

So engines produced between '86 and '93, but only those with cats, are recommended to run the ZGR5A plugs. However I think it is well known enough that the BPR6ES will run on any standard M20B25

i think this explains what to get

BPR6ES are £1.22 each on ebay , =£7.32 , little cheaper than £15

BATTS91 wrote:BPR6ES are £1.22 each on ebay , =£7.32 , little cheaper than £15

cant grumble at that, just found them and bought some, although the ZGR5A are what have been in the car since ive had it

snap just bought some myself ,some new feeler gauges for £2.38 and a set of 3 wiper blades for like £9
Ebay does have its uses over motor factors somtimes , only if you dont mind waiting for goods :/

do you ned the gauges or should they already be correct ? , ive had a fair bit from ebay latley its been great, cheap as chips and no hasstles, foam tape,stereo cage, speaker cable, all sorts of useful stuff

polsta wrote:do you ned the gauges or should they already be correct ?

Gap should be 0.7mm

I always gap mine, they seem to come set a bit wider out of the box.

i bought the gauges first as it goes to do valve clearances as i have no idea were mine dissapeared to .