Knocking/Pinging - Really bad or harmless?

[Jose]

sometimes even on ron97 also i experience some slight knock on my car. bad fuel ?

 

[stupidcar]

sometimes even on ron97 also i experience some slight knock on my car. bad fuel ?

Malaysia fuel not clean!

 

[Izso]

sometimes even on ron97 also i experience some slight knock on my car. bad fuel ?

Actually it depends. I have tested a few different brands of 97 including Vpower Racing. The worst of the lot seems to be Shell. This applies even in Singapore when I used their RON98. I would get knocking at the higher rev ranges no matter what. Don't know what's the main difference between the brands but the best seemed to be BHP for me, followed by PETRONAS and then Esso/Mobil.

 

[boyzone]

sometimes even on ron97 also i experience some slight knock on my car. bad fuel ?

Malaysia fuel not clean!

Actually it depends. I have tested a few different brands of 97 including Vpower Racing. The worst of the lot seems to be Shell. This applies even in Singapore when I used their RON98. I would get knocking at the higher rev ranges no matter what. Don't know what's the main difference between the brands but the best seemed to be BHP for me, followed by PETRONAS and then Esso/Mobil.

is very subjective as difference engine matched with difference petrol additive formula.
For me, Proton, Produa & Mitsubishi engines are well suit with Petronas.

 

[vr2turbo]

sometimes even on ron97 also i experience some slight knock on my car. bad fuel ?

Could be or your engine highly mod?

---------- Post added at 09:24 AM ---------- 6 hour anti-bump limit - Previous post was at 09:23 AM ----------

Malaysia fuel not clean!

Nowadays hear less of these cases. Those days plenty, mixing kerosene and all that....

---------- Post added at 09:27 AM ---------- 6 hour anti-bump limit - Previous post was at 09:24 AM ----------

Actually it depends. I have tested a few different brands of 97 including Vpower Racing. The worst of the lot seems to be Shell. This applies even in Singapore when I used their RON98. I would get knocking at the higher rev ranges no matter what. Don't know what's the main difference between the brands but the best seemed to be BHP for me, followed by PETRONAS and then Esso/Mobil.

You also? I tried Shell Ron97 FS formula before their V Power. It was so bad that I had to siphon the fuel out. After that no more Shell for me even though they change to V power formula.
BHP good, means their 800ppm is good?
Still stick to Esso/Mobil which is Petron now. Running okay and got smiles points.....hahhahahaha

 

[Jose]

Yes, mostly experience it when fuel up with shell 97. but i do experience it on mobil 1 fuel as well. it's on low rev when i wot there's slight knock on 3k rpm then the sudden surge at 4k rpm. and this usually happen on a hot sunny day. on a cool day eg 24-26'c car is smooth as silk. Suzuki Swift Sport with just some minor mods such as intake and exhaust with emu.

 

[Sayko]

i have knocking too, but when i drive with lpg, i have no any knocking with petrol... i doupt about distributor, i just bought ignition plugs and plug cables.

 

[boyzone]

Just pumped Caltex RON95 ...so far no knocking even though run with duratec 272 cam :proud:

 

[vr2turbo]

Just pumped Caltex RON95 ...so far no knocking even though run with duratec 272 cam :proud:

Sometimes it takes up to three tanks full for the engine to adjust....

 

[TheDuckster]

Sometimes it takes up to three tanks full for the engine to adjust....

so the consensus is fuel from which company experiences the least knocking?

 

[boyzone]

Sometimes it takes up to three tanks full for the engine to adjust....

5537 ECU is run without O2, need to wait and see after few tanks of fuel.:hmmmm:

 

[vr2turbo]

so the consensus is fuel from which company experiences the least knocking?

Cannot say as different people have different results even with the same make of vehicle. Best is to test them yourself and see which fuel suits your car.
I tried Shell old FS formula Ron97 and it did not suit my VR so I went back to my Esso/Mobil which is now Petron. Since running fine on this I rather not test with other fuel, but another main reason also I have two Petron stations near my home....

 

[muzhaffar]

Dont expect to demolish knocking from ur blacktop. It requires ron100 as a standard

 

[Kopi]

how do you even define 'knocking'?
sounds from the cylinder head? ignition misfiring as pre-detonation?

 

[jeheyr]

I have experience with knocking..
my previous b20 piston crack..