Club Triumph

Quoted from mpbarrett

Agree NGK do not like getting soaked by a PI above sea level. Doesn't matter how well you clean, de grease, polish them they do not work as well as new ones... Even tried there 3 prong ones they are better still no good after getting a TR PI soaking!

Mike

Another vote here for Denso plugs, much better than NGKs IMHO.

Hi,
Would anyone know the correct part number of a Denso plug for a MK2 2.5PI (PFL) - I have found four numbers and am not sure which one to try:-

W20 EP-U
W20 EX-U
W20 EPR-U
W20 EXR-U

many thanks,

Quoted from Sienna PI

Hi,
Would anyone know the correct part number of a Denso plug for a MK2 2.5PI (PFL) - I have found four numbers and am not sure which one to try:-

W20 EP-U
W20 EX-U
W20 EPR-U
W20 EXR-U

many thanks,

Bit of an erratic drive to work this morning,so before I left for home I decided to change the plugs.
1-5 looked a bit week to me and 6 was a bit sooty.
All had gaps of 30 or just over 😞 As I fitted the new ones I gapped them to 25,I also set the mixture so it's now 2 full turns down from the level bridge.
I thought I'd finally got it,but on arrival at home the idle was better but still not sweetly smooth and it's still up at 11-1200 a quick stop at the shop and I wound the idle screws up a bit but bugger all happened.
Conclusion :-
I now know there's no air leaks
I now know the plugs are gapped and clean
I now know the mixture is possibly better set than it was
The timing is set at 10 via the strobe light
It's still not right 😒

Before Sunday's Coventry rally I'll remove the carbs to check there closing properly even though I'm 99.9999% sure there ok. If they are closing ok then I'm well and truly all out of ideas other than doing a compression test to see if there's a valve or ring problem,which would really not make me a happy person at all

Dave

If the idle screws are would right up (i.e. not touching the carb body) and the engine is still running, you have an air leak.

My thoughts would be on butterflies not closing.

push down on the linkages, or take the air filters off and push the butterflies closed.

Cheers

Is the choke definitely shutting off?

Today I have :-
Found the hose that goes from carb - rocker cover had split, so my previous fix lasted just over a week


That made the idle quite smooth but still not bang on and the timing via strobe light still jumping a bit and the idle still high so I pulled the carbs

And the other one

I think there was a couple of things holding them open
Butterflies not a snug fit, needed a slight adjustment
The little screw that lets the choke open them slightly when you pull the choke was also holding them a wee bit
I also had to open up the points a little, now re set at 15 thou

I can now stall the car by winding up the idle screws
The timing via strobe light seems static and is no longer "wondering"
The tickover is smooth

So things now sorted and also once again many thanks chaps for all the sugestions and help, but I was 99.999999999% sure the butterflies were shutting when I refurbed the carbs 🤔😒😟🙄

Quoted from Davemate

So things now sorted and also once again many thanks chaps for all the sugestions and help, but I was 99.999999999% sure the butterflies were shutting when I refurbed the carbs 🤔😒😟🙄

👅

Awesome Dave! Even though it took a while to diagnose you got there and I bet you learned a heap about your car in the process.
Well done mate

Hello Dave,

good to see a solution. I think most of us have, at one time or another, had problems fitting new butterflies.

Alec

Just arrived in Coventry,things seem good

Good Man Dave,time to go and enjoy! You've done well,it's certainly not been a cakewalk,but it's given the rest of us a "step for a hint" for any problems we may encounter in the days ahead.
     Once again,congratulations!!!
Bill.

Just got back from Coventry on the whole it was a good trip, one carb dropped out but after removing the dash pot and piston I then used a squirt of carb cleaner down the jet tube and made sure it was bubbling back up in the float bowl.
After that,no more problems.
A couple of times I thought there seemed to be a slight miss but I think I need to raise the fuel level in the float bowls,I'll remove the packing washers I fitted under the float needles.
I done 250 miles and averaged just over 25 mpg considering I did give some grief on the rally I'm quite happy.

good here your mk1 is running better now dave. ive heard it pulls really to, no doubt il have some problems with my ex pi when i transfer all the parts from my green mk2 onto it

Forgot to add 10% that my speedo is out
Works out 27.7 mpg as I've got a 3.7 diff, I'm happy with that.

Its Happy motoring from now on

good to hear the sarga has a happy ending.

if the speedo is  a consistently error you may find a strip out and hold the drive disc move the needle a few MPH may give you overall reasonable accurate speeds

you wont correct the oddomemter , but did this on my Mk2 with 14" wheels fitted  a alternative speedo pinion from Chris witors techy pages on speedo TPM's

Pete

I've got a speedo that's stamped 1,000 which I believe is for a 4-1 diff I've fitted a 3.7 but I may well fit a 3.4 so I'm not going to bugger about with it just yet 😏

sounds a plan,  my Mk2 has the  worst  74  spec,  dreaded SU HS4s and a flat cam so if i took the 4.11 out for a higher ratio    i would have to add some sinclair C5 pedals

but i liked the colour   !!!

Pete