Grand Prix 500
Main Motorcycle: '99 Legend TT
Join Date: Nov 2015
Location: North Alabama, USA
sintered bronze (rock) fuel filters
I am new to triumphs and this board, but with my recently acquired Legend TT, I am going thru it to get it running up to my standards. I am an old hotrod and racer.
A significant number of the universal inline filters I am seeing referenced on the internet motorcycle sites and on the shelfs at the motorcycle shops are of the sintered bronze (better known as 'rock') filters design.
These are very good filters, but incredibly restrictive and low flow. This means they clog very easily and quickly, as the pores get filled with particulate. They are touted as being cleanable, HOWEVER they never flow as they did when new, and get clogged quicker and quicker. the clogging debris can be miniscule sized, so the filter still looks clean.
In the automotive performance industry, they are steered away from. Yes, they are available at every source known to man in various, sizes, and configurations. But that does not mean they are good. Case in point, in the 70's, GM was using rock filters at the carb inlet fittings. the first thing that most people were told to do was remove the filter and install an inline paper style or screen style filter. I myself have been foiled by the rock filters on many occasions. Low flow, will do whacky things with the float level and needle response, therefore producing inconsistent idle mixture and speed tuning. And also, simply stop flow too.
SO, thats my tip, steer away from pretty anodized filters that have the bronze elements in them. Always use a screen or paper element filter, and replace it regularly. I have seen some anodized filters that utilize a paper element, I will check them out.