Quote Originally Posted by ghosthunter View Post
Curiously, how did you come across the above mentioned sludge build up on the engine pistons on LPG taxi cabs as compared to gasoline taxi cabs? Do you maintain a taxi fleet?
yes i do. its really not much. i and my dad maintain 44 units of taxi,(along with 1-3 helper/s), all running in lpg. it's not really that often that i change headgaskets on a xl corolla with a 2e engine. but compared with the gasoline, sludge build up is more evident on lpg. i've also worked on 4g13s on a lancer el(we have 4units among the 44). same find. then about 4units of sentra series III among the units with the surplus blacktop engine. ive only had about 2 times replacement of the head gasket with the same sludge buildup. ive never really opened the engine for the sentra back when it ran on gasoline. i'll try to get pics next time i have a headgasket replaced.

good for you that you know how to tune your own car. not everyone knows how to thinker with their engines.

with the macro lpg, the lpg flow is controlled by the "rpm" tick given off by the distributer. when u turn the key to on, it will let lpg flow for a few seconds then cut off. i had a chance to work with only 2 naiadss kit and i find that it consistently gives lpg flow to the carb once the key is set to on. i was on the impression that it gave a consistent flow to the carb regardless of rpm the engine was on. thanks for this correction.