Panko 2,481 Posted April 13, 2016 Hi guys, just out of interest, what does everyone run in the way of plugs for their crossflows? Share this post Link to post Share on other sites
Mixalis 266 Posted April 13, 2016 Also interested to hear what people run. My ones a very high comp street motor that builds up a lot of cylinder temp especially after long drives/warm weather/idling for too long. Occasionally would 'run on' in these conditions with BP5's. I have now moved on to BP7's but haven't had enough seat time to test whether they foul up or have fixed the issue. I run on Premium unleaded (occasionally i octane boost it to 100). I know that the general rule of thumb is 1 range colder for every 75hp-100hp they say, however I've always leaned towards the alternative theory that it should be based off compression ratio. Share this post Link to post Share on other sites
slydog 7,873 Posted April 13, 2016 NGKB7ES street or NGKB8ES. Have used NGK V power but car made no more power with em and they cost $52 a set ! Share this post Link to post Share on other sites
ando76 4,354 Posted April 13, 2016 NGKBP9ES for high comp meth engines NGKBP7ES 8 for high comp petrol. NGKBP6ES for my interim shop ute that runs a better 2 barrel intake, 350 Holley and extractors. Share this post Link to post Share on other sites
Panko 2,481 Posted April 13, 2016 Ok cool. I need to replace mine, im still running NGK R (cant remember exact part number) for lpg, and i removed the gas 18 months ago. Its a stock efi crossy, extractors, manual. Just want something that will perform properly Share this post Link to post Share on other sites
Grimmy 312 Posted April 13, 2016 I use Bosch units , they cost a bit extra . I had a heap of ngk plugs fail for no apparent reason . Had no troubles with the Bosch ones Share this post Link to post Share on other sites
Panko 2,481 Posted April 13, 2016 What bosch plugs? Part numbers? I looked up bosch, ngk and champion part numbers, so will be interesting to see what bosch units you run. Share this post Link to post Share on other sites
tpak addict 1,909 Posted April 13, 2016 Bosch WR9LCX in my stock 4.1 EFI Share this post Link to post Share on other sites
Grimmy 312 Posted April 14, 2016 Bosch WR7DC+ , for me . With aftermarket ignition systems you don't need a resistor type plug . But I got them for reliability Share this post Link to post Share on other sites
Mr Polson 10,214 Posted April 14, 2016 Autolite. From memory. Share this post Link to post Share on other sites
Buster88 2 Posted December 30, 2020 Would resister plugs effect how the 250 xflow efi would run? Share this post Link to post Share on other sites
slydog 7,873 Posted December 31, 2020 You need r's on a EFI engine so you don't cause signal interference Share this post Link to post Share on other sites
Buster88 2 Posted December 31, 2020 Sweet as mate we've ruled that off the list, It seems to be a earthing problem as im only gettimg 6 volts of ignition coil. Have run the battery to the boot so will have to do a bit of checking of what's going on 2 Outback Jack and roKWiz reacted to this Share this post Link to post Share on other sites
broken-wheel 659 Posted June 6, 2021 I have had two dead NGK's out of the box, one in the falcon one in the Rangie, will probably not use them again, the one on the Rangie was completely dead and the damn thing was running pretty ok on 7 cyl, but since I have it a plenum clean etc. I thought the ecu needs time, it didn't get better so after about 2 months I had a look and yeah one dead plug, changed it with the old one, Bosch, and all good Share this post Link to post Share on other sites
gerg 10,871 Posted June 8, 2021 I have had two dead NGK's out of the box, one in the falcon one in the Rangie, will probably not use them again, the one on the Rangie was completely dead and the damn thing was running pretty ok on 7 cyl, but since I have it a plenum clean etc. I thought the ecu needs time, it didn't get better so after about 2 months I had a look and yeah one dead plug, changed it with the old one, Bosch, and all good That's disappointing, I've had a pretty flawless run with NGKs up until now. Not a Crossy but I've run BP4FS in my clevo and were pretty good but the MSD chews them out pretty quickly. I ran BP6FS previous to that but they fouled in a short time (too cold). I think the optimum is 5s.Although recently, I did encounter a head-scratcher with a Honda sweeper engine on LPG... It would run great for about 30 seconds, start coughing, then die. Start up again, 30 seconds... cough.... die. After rebuilding then replacing the converter, stuffing around with everything else, I finally just shoved in a spare (wrong) plug I had lying around and suddenly it ran like a clock. It was the bloody spark plug all along. It was a BPR5ES and I smashed it apart to see what the go was inside and found the resistor (a little carbon pellet) looked a bit broken down and corroded. So this could be a problem with NGK resistor plugs in that regard.Sent from my CPH1920 using Tapatalk Share this post Link to post Share on other sites
roKWiz 900 Posted June 8, 2021 Using Russian made Bosch. Share this post Link to post Share on other sites