Why would 1 &3 fit differently to 2&4 - surely the fit is going to be the same on all?
(I've an EU2 , so don't understand the subtleties of EU3)
Have you tried swapping pairs 1+3 and 2+4 to see whether the problem moves with them?
1 & 3 have a coil pack on top of them. The spring contacts on these will probably just be a bit more compressed than usual.
2 & 4 then have flying leads which sit proud.
It's a wasted spark setup with one coil driving two plugs.
SV VVC 170 - 170.4 bhp @ 7100 rpm - 142.4 ft.lb. @ 4900 rpm
Thanks for that, Andrew. I'd carelessly assumed that all connectors were the same! (Blame my EU2 heritage.)
The latest NGK spark plug catalogue (2017/18) lists BCPR7ES (3330) as an alternative to the recommended BCPR7E (1272), so I would hazard a guess that they have the same overall dimensions.
Thanks guys, it's a little confusing. Got these from Opie oils so I'd imagine they are genuine.
I'll do some ringing around tomorrow and will report back if anything comes of it.
You could try spraying a little bit of WD40 into each cap first, sometimes they can stick a bit
Had an email conversation with the ever helpful Dave Andrews and his feedback was that providing the leads are located on the ferrules securely and the coil cover is in place it shouldn't be a problem. The VVC head has 12mm longer leads so would potentially sit proud even more. If worried about movement of the leads then a spacer can be made up from HD foam.
I did manage to push the leads down a few mm more with the help of some WD40 (cheers p.mole) and more leverage, so they're sitting 5mm proud now which I'm ok with.
Having done some measurements, the plugs should fit fine with 1mm spare, I think the problem is more to do with the tightness of internal ferrule locating tubes (oi oi), maybe over time they'll loosen a tad.