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Petrol grade RON 92 Mixing With RON97

04/24/2009 3:38 AM

Dear all Gurus,

When my car(1298CC with Mitsubishi fuel injection engine) is using RON92 engine is knocking and sitch to EON97 is normal and feel little more power.

What will happen if i mix 92 to 97 in the equal quantity.

Thank you

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Anonymous Poster
#1

Re: Petrol grade RON 92 mixing with RON97

04/24/2009 4:12 AM

As close as makes no difference 94.5.

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#2

Re: Petrol grade RON 92 mixing with RON97

04/24/2009 6:57 AM

What is the recommended octane rating by Mitsubishi for the vehicle? The knocking can be do to high compression engine running on low octane fuel. Thats is why the improvement when you switch to RON97. Will the mix of the two meet the recommendations for the engine.

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#4
In reply to #2

Re: Petrol grade RON 92 mixing with RON97

04/24/2009 10:36 AM

no..

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#3

Re: Petrol grade RON 92 Mixing With RON97

04/24/2009 9:13 AM

You do not say what year your auto is, but engine timing is frequently adjusted by a "knock detector" installed on the block. Failure can produce the symptoms you describe.

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#5

Re: Petrol grade RON 92 Mixing With RON97

04/25/2009 4:53 AM

Have you also checked your fuel consumption / Cost ? Because you may find that you can actually save money overall by using the higher Octane fuel......Knocking is partially lost energy.....

Also having a relatively modern engine that "knocks" is worrying as someone else mentioned, because most modern engines adjust themselves to stop the knocking.

The "knocking" sound is the fuel exploding instead of burning, this causes damage to the bearings of the conrod.....both ends and also possibly to the crankshaft bearings too....its not good.

Adjusting the Octane so that you cannot "hear" knocking is simply not good enough, as the onset of "knocking" will not be heard by a human, only by a specially made sensor!!!! The "onset" will also damage an engine.....albeit slower I would imagine....

There is a possibility that your knock sensor is not working, which may be causing you the problems in the first place. Have you read the handbook or spoken to the local manufacturer representative.....? That may be a good idea.....maybe your engine is not fitted with one at all....

A little bit of knowledge could be dangerous!!!! ...to your wallet!!

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Anonymous Poster
#6

Re: Petrol grade RON 92 Mixing With RON97

05/10/2009 9:25 AM

Mixing equal parts of RON92 and RON97 fuel should provide you with a RON rating of 94.5.

What does your owners manual recommend? If it recommends using RON92 fuel and your are getting knocking then either the fuel is not RON92 or something is malfunctioning in the system.

If your owners manual that you used the higher RON fuel you should use that fuel.

Niel Leon

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