Mathew Posted March 31, 2021 Report Share Posted March 31, 2021 I have some denso w16ep-u fitted. I know a bit rich (hs6 su) i can see the previous owner had tried champion n12 and n9 in the past. i have always used ngk bp6es in the past, 5 if i want it hotter. should i stay with the denso or change to the ngk? Not a hard used car. Anyway going to lean up the mixture half a flat at a time till the colours right. Link to comment Share on other sites More sharing options...
Pete Lewis Posted March 31, 2021 Report Share Posted March 31, 2021 hobsons choice again many sing the praises of bosch but unless you pull a plug after a long steady cruise a bit of soot is inconclusive thn theres all this Link to comment Share on other sites More sharing options...
Nigel Clark Posted March 31, 2021 Report Share Posted March 31, 2021 Also consider multi-electrode plugs. Our Triumph engines run better on Bosch WR78 or NGK BUR6ET, better starting, smoother idling and sharper throttle response. And these plugs seem more resistant to fouling. Nigel PS: Multi-electrode plugs also last for many tens of thousands of miles before needing replacement. Link to comment Share on other sites More sharing options...
Nick Jones Posted March 31, 2021 Report Share Posted March 31, 2021 +1 for multi-electrode. Been using them for decades. Triumphs love them. Bosch are my favourite. Nick Link to comment Share on other sites More sharing options...
DerekS Posted March 31, 2021 Report Share Posted March 31, 2021 Would you recommend these for a Spitfire 1500, Nigel? Derek. Link to comment Share on other sites More sharing options...
Nigel Clark Posted March 31, 2021 Report Share Posted March 31, 2021 19 minutes ago, derekskill said: Would you recommend these for a Spitfire 1500, Nigel? Derek. Yes, the Triumph OHV 6 and 4 cylinder engines are basically the same architecture. I've used multi-electrode plugs in a Spit Mk3, a GT6 2 litre Mk3, a modified 2500S saloon engine and a TR6 PI. All showed the same benefits. I'm sure they would work well in a Spit 1500. Nigel Link to comment Share on other sites More sharing options...
DerekS Posted April 1, 2021 Report Share Posted April 1, 2021 Nigel/Nick, I have been considering these for a while but the listings on ebay are a tad confusing, suitability, pricing etc. Without trying to put you on the spot, do you have a supplier you can recommend please? I would probably prefer the Bosch although NGK are sound. Thankyou! Derek. Link to comment Share on other sites More sharing options...
Nigel Clark Posted April 1, 2021 Report Share Posted April 1, 2021 Try the Green Sparkplug Co: https://www.gsparkplug.com/?gclid=CjwKCAjw3pWDBhB3EiwAV1c5rCZSndaQpTWdDUKABxAuIuJr0doEmkRUmwK8khvRxuoG4iu9p-FMXBoC4osQAvD_BwE Nigel Link to comment Share on other sites More sharing options...
Gully Posted April 1, 2021 Report Share Posted April 1, 2021 Presumably the R in the BUR6ET reference means they are resistive plugs? Is there a non-resistive version, as I've always avoided the suppression / resistive NGKs for my GT6 based on advice from this forum (and elsewhere)? Thanks, Gully Link to comment Share on other sites More sharing options...
Iain T Posted April 1, 2021 Report Share Posted April 1, 2021 +1 for W78 plugs, I bought mine from Greensparkplug. They have a larger gap so make sure your coil is up to it. Link to comment Share on other sites More sharing options...
Nick Jones Posted April 1, 2021 Report Share Posted April 1, 2021 It’s getting harder to find non-resistive plugs, especially multi-electrode, as the vast majority of the national fleet now requires them. I’m not sure what the problem is supposed to be using them on the conventional ignition systems.... The other potential issue using multi-electrode plugs with conventional ignition is they will come gapped for high-energy ignitions and ideally need the gaps shutting down a bit. Or fitting electronic ignition. Bosch non-resistive triple W7DTC As above but resistive WR7DTC Both the above getting harder to find now, especially non-resistive The easy to find ones are the WR78 which are quad electrode and resistive. I have set working just fine in my GT6 with points ignition...... They’ve proved pretty fouling resistant too as that engine had a real oil problem until the rings seated. Nick 1 Link to comment Share on other sites More sharing options...
Nigel Clark Posted April 1, 2021 Report Share Posted April 1, 2021 I've found Bosch WR78 and NGK BUR6ET both work well in Triumph engines. I've always used them with electronic ignition and a high output 'sports' coil. Nigel Link to comment Share on other sites More sharing options...
Mathew Posted April 1, 2021 Author Report Share Posted April 1, 2021 Got 8 bosch wr78 ordered on ebay, two different sellers, shame not sold in a six pack! Could have got another pack and have a spare set! Will see how i get on, with the miles i do 6 will see me out! Link to comment Share on other sites More sharing options...
Iain T Posted April 1, 2021 Report Share Posted April 1, 2021 Greensparkplug sell both W78 and WR78. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 1, 2021 Report Share Posted April 1, 2021 if the R is resistive ive always found that corks up the low HT we rely on fine on a modern with over 32kv but we as std dont have that and generally around 22kv having a resistive R suffix spark plug has in my experience caused many a misfire its a love em or hate em thing Pete Link to comment Share on other sites More sharing options...
Colin Lindsay Posted April 1, 2021 Report Share Posted April 1, 2021 Early Heralds not being the most difficult of engines are easier to keep running; I've got a new set of the old pink Champion plugs that they were originally supplied with and will probably use those on one of mine, but I was recently recommended Brisk plugs, apparently very popular with motorcyclists - the Brisk NR15S plugs fit the Heralds and other four cylinders. They cost me about a fiver each. Sometimes the older, simpler technology is better for our engines. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 1, 2021 Report Share Posted April 1, 2021 and some heralds and spitty are 1//2" short reach not the usual 3/4" of all the others ( must be a carry over from side valves ha ) Pete Link to comment Share on other sites More sharing options...
Mathew Posted April 1, 2021 Author Report Share Posted April 1, 2021 1 hour ago, Iain T said: Greensparkplug sell both W78 and WR78. Interesting site, but had already ordered! Link to comment Share on other sites More sharing options...
DerekS Posted April 1, 2021 Report Share Posted April 1, 2021 Very interesting thread this and they do look interesting but I can't decide whether to go for the R type or not... 🤔 Derek Link to comment Share on other sites More sharing options...
AndyTV8 Posted April 1, 2021 Report Share Posted April 1, 2021 4 hours ago, Pete Lewis said: if the R is resistive ive always found that corks up the low HT we rely on fine on a modern with over 32kv but we as std dont have that and generally around 22kv having a resistive R suffix spark plug has in my experience caused many a misfire its a love em or hate em thing Pete I’m with Pete on this one, I’ve always steered clear of resistive plugs after past bad experience. ...... Andy Link to comment Share on other sites More sharing options...
Steve P Posted April 1, 2021 Report Share Posted April 1, 2021 I knew i had some somewhere,i bought 8(?) Bosch W7DTC for my 2.5 Vitesse in 2019,but haven`t fitted them yet as i wasn`t sure they would work better than the BP6ES i have in there. Steve Link to comment Share on other sites More sharing options...
Iain T Posted April 1, 2021 Report Share Posted April 1, 2021 When I changed from BP6ES to Bosch W78's there was a noticeable improvement . Going up my (well it's not mine but in the complex where I live) multi-storey car park at low revs it was always a bit jerky but with the W78's it's nice and smooth. Iain Link to comment Share on other sites More sharing options...
Nick Jones Posted April 1, 2021 Report Share Posted April 1, 2021 3 hours ago, Steve P said: i wasn`t sure they would work better than the BP6ES i have in there They will! Try ‘em! Link to comment Share on other sites More sharing options...
thescrapman Posted April 1, 2021 Report Share Posted April 1, 2021 I get my W7 DTC from green spark plug co. Seem very good to deal with. much harder to foul in a PI, but I have managed it, hopefully not with the rebuilt engine. Link to comment Share on other sites More sharing options...
DerekS Posted April 2, 2021 Report Share Posted April 2, 2021 Thankyou one and all for all the advice, very much appreciated! The gspark website is fantastic, I've ordered a set of W7DTC's to try and I've finally found a supplier for an oddball size for a 2-stroke strimmer belonging to 'Er indoors. (She bought it at B+Q but surprisingly they don't stock any spares.) Derek. Link to comment Share on other sites More sharing options...
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