http://www.youtube.com/watch?v=gQghB4asSnI

For those of you that say RON95 is JUNK and worship RON97!!!

hahahaha

in UK SHELL OPTIMAX is RON98 Ultimate is RON97

supermarket is RON 95

Unless you driving performance car like GOLF and SUBARU then yeah it make sense

Normal car... better give me your money...

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Added on May 22, 2012, 2:57 pmnow you know why CIVIC TYPE-R recommend RON97 and other normal car is RON95 or RON91 thailand uses RON91 BTW

This post has been edited by calvin_ng: May 22 2012, 02:57 PM

RON95 have no issue laaa Proton Saga (Old)/Iswara and Wira (Carb) is tune for RON91 (Due to thailand requirement) if not how on hell you drive your car to Thailand cross border over there there is no such thing as RON97 and they pump RON91!!!

all car authorized manufacturer seller (ASEAN country) is compatible with RON91 (minumum requirement)

All recond car (From other country AP car)
-Europe country (RON92 minimum) - supermarket grade, except sport car
- Japan orgin (JDM cars) - (RON95/97 minimum) as Japan lowest RON is RON97 and their premium fuel is RON99 (If car has knock sensor RON95) expect horse power reduction
- US orgin car (RON 95) minimum

RON97 only car

Modified car like Kancil Turbo (Transplant from L2000/L5 etc etc) RON97 min as Car in Japan is RON97

Honda Civic Type-R : RON97 minimum *Recomend by japan RON98/99
so Shell V-power works here

Performance/sport car better RON97 since you guys can afford it

Those who transplant engine (half cut from Japan) prefer RON97

Yeah.... RON95 is so corrosive that RON97 is not harlow.;. it is petrol what U ESPECT....

RON95 amd 97 is basically same petrol the different in RON numbers is the ability to combust... 95 combust earlier and 97 later (which add to 97 stability) it is called pre-mature combustion nothing to do with the nature of corrosive or heat...

for HEAT issue check your water level guess something leak... (not your petrol)

OK hahaha you guys are jokers....

ok let me put it straight... yes compression ratio affect the RON rating

see here

http://en.wikipedia.org/wiki/Compression_ratio

the calculation is


= cylinder bore (diameter)
= piston stroke length
= clearance volume. It is the volume of the combustion chamber (including head gasket). This is the minimum volume of the space at the end of the compression stroke, i.e. when the piston reaches top dead center (TDC). Because of the complex shape of this space, it is usually measured directly rather than calculated.

So this means a engine with compression ratio of 11.1 to 1 is safe to run on RON87

now lets look at our car Compression ratio

Honda City : Compression Ratio 10.4 (http://honda.com.my/model/overview/city/)
Honda Civic (NEW) : Compression Ratio 10.6(1.8l) 10.6(2.0l)
Honda Civic FD2r (Type-R) : Compression ratio 11.7 (Not RON 95 safe) USE RON97

Toyota Vios : Compression Ratio 10.5
Toyota FT86 : Compression Ratio 12.5 : 1 (not RON95 safe) USE RON 97

PROTON engine
Campro CFE engine : compression ratio : 8.9:1 to 10:1 (CPS retard the timing to 8.9 lowest)
Campro CPS engine : compression ratio 10:1

Myvi 1.3 : compression ratio 10.0:1

so we can now say it is safe to use RON95... wait wait how about old car before RON95... hehe

Proton Wira : Compression Ratio 9.2:1 (Safe for RON92)
Proton SAGA (The original SAGA) : Compression Ratio 9.5:1 (Safe for RON92)

remember when saga come out we only have RON91 and RON 92 the car need to be compatible with it... also that time Thailand only have RON88

so now who going to dispute the formula from wikipedia and our car will spoil in RON92...

MOST OF OUR CAR CAN RUN ON RON88 for GOODNESS SAKE!!! stop wasting money and let the rich waste money!!!

go wikipedia and do the formula calculation.. check manufacturer specification for compression ratio (I hope manufacturer dont lie their compression ratio)

The tric to reduce compressio ratio is directly invilve in variable timing where the valve maintain open in the inlet to have flow back hence reduce compression ratio and save fuel each piston has a fix compression ratio but by retarding the inlet valve longer the mixture will flow back and reduce the compression ratio hence this is how knock sensor work.

psst... let me tell you a secret... It's in your brain.... it is not REAL......

Yes agree with you the compression ratio pretty much remain the same since the cylinder length is the same (unless some genius invent variable cylinder length management haha not possible)

Alot of new car come with hi tech stuff to varies cylinder / varies valve / retard ignition / and with the new Prius engine even make a normal otto cycle engine become atkinson engine.... simply by playing around variable valve / retart the valve / etc etc

Psstt... another secret... your right foot your right foot...!!!

hahaha actually it is very hard to determine by feel... unless you dyno your car lor...

here is the video again

watch this video

http://youtu.be/dDHwCWdrtdg

dont say dunno lar.... cannot ignore your feel one... very bad for karma hahaha

and your car is???

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Added on August 2, 2012, 3:33 pmThe Mother of all answer you suc*ed at maintaining your car... slso the warranty is over and your car is old... things that move tend to brake....

This post has been edited by calvin_ng: Aug 2 2012, 03:33 PM

hahaha oops spelling error...... soli lor me no england teacher.... hang on while I go find one to check everyone grammar and error....