The Triumph 2000/2500/2.5 Register Forum

Hello everyone. So as some of you know I recently bought a 73 2000 estate. It's still definitely a 2000 engine but on hs6 carbs and with pancake filters.
Doesn't run as it should.
My plans are unless you can advise me otherwise are to fit the original air filter system that was on the late 2500s etc and fit the bcy needles that were used in late 2000 cars that had hs6 carbs anyway. Its getting a sports exhaust too.
I'll then take it for a rolling road tune at a triumph specialist.
Does it sound like a good plan to go back to factory spec?
Once it running well I can start doing a few mods like the cam, headwork etc. Basically want to get it to tr6 150 spec without changing the engine.
First of all though I need to get it running properly.
Thanks
Joe

Hi Joe,
There are a lot of other aspects to check before tackling the carbs. The ignition side of it needs to be right first and then the carb set up done last.
I would replace the ignition components if suspect, and as you have mentioned, go back to factory settings - tappets at 10 thou, if you are on standard ignition the plugs at 25 thou, points between 14 / 16 thou (I usually set mine at 15) and the static ignition timing at 8 degrees.
If it doesn't start then (it should do as it is running at the moment), the basic set up of SU carbs is outlined in the Haynes manual. Basically, the important bits are that the throttle butterflies open together and the height of both jets is similar with the air intake to both carbs is equal. There should be sufficient oil in the carb piston damper too. It should run something like then to get it to the rolling road.
All of these settings don't factor in wear but tweaks can be done at a later stage. The basic set up details are in any of the workshop manuals.

Excellent thankyou. The ignition side of things is all new and has been set up correctly. I should think once its been put on the rolling road and the original air filter pit back it will run nicely. That's the plan anyway.

I wonder if you're placing too much importance on the air cleaner. I've run K&N filters on my TC for years with no abnormal results. I'd be more concerned with the condition of the carbs themselves. Jets, needles body wear etc.
Tony.

Hello,
I was under the impression that it wouldn't make a huge amount of difference but from what what I have read and been told you cant get hs6 carbs to run how they should by using pancake filters as they get no cold air to them.
I'm hoping it just needs a good tune to be honest. I dont think its anything major. Worthwhile checking, replacing stuff as I go.
Thanks
Joe

Hello Joe,

I don't think this is true. Certainly having a cooler supply does give a small performance increase, but not I would say, really noticeable? The car should still run OK.

Alec

I'll have to see. I'm sure I will find out once it has been put on the rolling road.