Advice on carb setup

Engine Oily Bits, Ignition, Fuelling, Cooling, Exhaust, etc.
Post Reply
Message
Author
Joe Wright
Groupie
Groupie
Posts: 58
Joined: Sat Apr 04, 2020 11:59 am

Advice on carb setup

#1 Post by Joe Wright » Sun May 17, 2020 4:49 pm

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

johnnydog
Senior Member
Senior Member
Posts: 1135
Joined: Tue May 14, 2013 12:33 pm
Location: Lancashire

Re: Advice on carb setup

#2 Post by johnnydog » Mon May 18, 2020 10:05 am

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.
Register Member no. 1596

1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
1970 Mk2 2000 in Valencia Blue
1972 Mk2 2.5 PI in Triumph White
1973 Mk2 2.5 PI in Sienna Brown
1976 Mk2 2500S in Carmine Red

Joe Wright
Groupie
Groupie
Posts: 58
Joined: Sat Apr 04, 2020 11:59 am

Re: Advice on carb setup

#3 Post by Joe Wright » Mon May 18, 2020 11:06 am

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.

tony
Senior Member
Senior Member
Posts: 786
Joined: Sun Jun 14, 2009 5:35 am
Location: New Zealand

Re: Advice on carb setup

#4 Post by tony » Mon May 18, 2020 8:49 pm

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.
1976 2500 TC. converted to S specs.

Lots of bits

1999 BMW Z3.
2006 BMW 325ti.
Hopefully not needing too many bits.
1998 Rover 600



.

Joe Wright
Groupie
Groupie
Posts: 58
Joined: Sat Apr 04, 2020 11:59 am

Re: Advice on carb setup

#5 Post by Joe Wright » Tue May 19, 2020 6:27 am

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

User avatar
Alec
Senior Member
Senior Member
Posts: 2399
Joined: Sat Feb 07, 2004 7:23 pm
Location: Oswestry, Shropshire

Re: Advice on carb setup

#6 Post by Alec » Tue May 19, 2020 8:32 am

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
0465

MK1.5 2.5 P.I.
Jaguar MK 2 (Long term restoration.)
Hymer 564 Motorhome.

Joe Wright
Groupie
Groupie
Posts: 58
Joined: Sat Apr 04, 2020 11:59 am

Re: Advice on carb setup

#7 Post by Joe Wright » Tue May 19, 2020 1:16 pm

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

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests