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Message: <blockquote data-quote="vv777vv" data-source="post: 3246153" data-attributes="member: 63527">Aluminium block or cast iron block makes no difference to CNG usage, it is the valve seat design and material that causes problem, not the engine block.limitations? in what sense? putting the valve seat design issue aside and assuming we are talking about older model engines, you can definitely use CNG on a high compression engine, it will run fine witout problem for normal driving. But if you are talking about long term excessive load on the engine especially at high RPM, CNG is not recommended. It will raise the engine temp (especially the exhaust temp) when you are running the engine at high RPM/load. So, CNG for drag, circuit driving, drfiting etc. is not recommended, do you consider these as limitations? I don't because nobody is going to do this kind of activities with an extra 60-70kg of cylinder weight on board the car. But if you're driving like Ah Bengs racing on public road all the time, then maybe CNG usage will be a problem to your engine in the long run.Because the MAIN purpose in malaysia for CNG usage is that it's economical for daily driving. IF you are looking for high power performance, you can install another type of gas instead of CNG - NOS, heheheee.... Our petrol engine NGV is a bi-fuel vehicle, you can switch between gas & petrol ANYTIME, so when cruising, use gas, and when u feel like flooring the pedal more, switch to petrol. A sequential kit does all that automatically, the ECU can be programmed to control all that. But if you're on a mixer system, then u have to do the switching manually...</blockquote>

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[DIY] : Shining Up some Old School Lenses.

Subject : KE70 DX stuffs. Yes, I have a new set of these stuff. But where is the fun part of having an oldschool machine if I didn't try to restore it?
View attachment 687976

Dirty lenses ready to be polished...