I'm changing the plugs in our bus.

The old ones are bosch WBAC (RO 491)
I've read that NGK are better so ordered the NGK B5HS( after reading several threads on the net)

The old plugs have a thin screw thread top but the NGK have a larger none thread top?
I was under the impression that the larger top would unscrew to expose the thread to but they don't ?

Are these the wrong plugs for our bus?
If so any recommendations ?

Thanks in advance
Simon

A plug is a plug, you won't even notice a difference,never had a bosch fail me
http://www.machine7.com/product.php?xPr ... &xSec=3250

I just fitted the NGK's to my van. You just unscrew the larger top off of the plug which will reveal the thinner top, but I did have to put a pair of pliers on them to unscrew. Not too much pressure but a bit more than your fingers (well mine!) can manage.

Cheers,

Mark

ShrediKnight wrote:I just fitted the NGK's to my van. You just unscrew the larger top off of the plug which will reveal the thinner top, but I did have to put a pair of pliers on them to unscrew. Not too much pressure but a bit more than your fingers (well mine!) can manage.

Cheers,

Mark

They look like they should un screw but I put a pair of grips on one and it didn't budge?
I'll try again later.
Cheers
Simon

Sorted it. Got the plug socket and grips on the job
Cheers
Simon

readyboy61 wrote:A plug is a plug, you won't even notice a difference,never had a bosch fail me
http://www.machine7.com/product.php?xPr ... &xSec=3250

No it isn't and yes you will.

Are the ngk's that much better than Bosch? Have just ordered 4 of the Bosch w8ac but will look at the ngk's next time. I mainly went for Bosch on the strength of the Bosch brand.

Seb

I'm running a stock 1600tp and don't expect to see any enhancement from the plugs. I just went for the NGK as recommended on lots of google search results.
Apparently a lot of manufactures are using NGK as there OEM choice and I think they are made in japan. The bosch plugs in our bus say made in China on them ?
Simon

joannedoyle wrote:The bosch plugs in our bus say made in China on them ?

That alone would be enough to put me off.

Shalom, Lee.

Choc wrote:

readyboy61 wrote:A plug is a plug, you won't even notice a difference,never had a bosch fail me
http://www.machine7.com/product.php?xPr ... &xSec=3250

No it isn't and yes you will.

Ok apart from temp ratings then. I bet on a blind test no one can tell the difference between the two! a rolling road would show no difference as well, I have a friend who is a serious racer in the caterham cup and he did just that no difference at all and nothing he could feel on the track either

I'm always surprised what does and doesn't make a difference.

My Bosch w8ac arrived yesterday and are made in India. Better than china I guess.

I had some bad fag bearings when I went to rebuild my red boxes (another oe supplier) and they where made in Taiwan. I had deliberately asked for fag as they where the original supplier to vw (and made in Germany back then) Luckily they where obviously faulty so swapped before fitting but I always try to get German, Japanese or British bearings if poss now.

beetleseb wrote:I'm always surprised what does and doesn't make a difference.

My Bosch w8ac arrived yesterday and are made in India. Better than china I guess.

I had some bad fag bearings when I went to rebuild my red boxes (another oe supplier) and they where made in Taiwan. I had deliberately asked for fag as they where the original supplier to vw (and made in Germany back then) Luckily they where obviously faulty so swapped before fitting but I always try to get German, Japanese or British bearings if poss now.

There are often qaulity issues with parts but dont always be put off because it says made in China on it, i work as a design engineer and we manufacture here and in China. Its often hard to convey what is expected but when china get it right its just as good as made here in the UK , China have some very advanced machines and factorys these days, not all is bad.

If Bosch have there qaulity control in place then it does not matter where its made, we have a procduct that was made here but now in China for Labour costs, it uses exactly the same machines and materail to make it just now has a label on it saying made in china instead of the UK. No difference in it at all.