View Full Version : TR2/3/3A TR3 Fast Road Cam and "RL" SU needles

05-16-2007, 06:43 AM
I read somewhere that,for the TR3, when going to a fast road cam or mild street cam that engine performance would benefit by switching the SU needles to RL (richer). Anybody heard this?

05-16-2007, 07:30 AM
True, a richer profile needle is sometimes needed to complement the higher rpm range of the cam. A tuned exhaust header and recurved distributor is also recommended to complete.

"How to Improve the TR3-TR4A" is a good reference for these mods. https://www.amazon.com/Improve-Triumph-TR...79320597&sr=8-2 (https://www.amazon.com/Improve-Triumph-TR2-4A-Roger-Williams/dp/1903706807/ref=sr_1_2/102-3354851-1780161?ie=UTF8&s=books&qid=1179320597&sr=8-2)

05-16-2007, 08:39 AM
Hi Peter I have the exhaust header. I'm running the Petronix. Could you expand on what you mean by recurved distributor? I've been meaning to buy the book you recommended. How can I be sure the timing is dead on for the mods I've done? Karl

05-16-2007, 10:13 AM
You'll want to have your distributer advance re-curved to get more spark advance in at a lower RPM to take advantage of the cam change.

Simon TR4a
05-16-2007, 11:07 AM
If you google "teglerizer" you will find an excellent site put together by Paul Tegler, including a comprehensive needle chart.
Spend a couple ofhours there, and plot graphs of some likely candidates and you will be able to make a well informed decision.
If the car is in a mild state of tune,mild cam only or little else,I have found SM needles work well.