98 octane in carby?

**pablos8** · 15-04-2010 06:32 AM

Hey guys, I was just wondering if it made much difference filling up on 98 octane in a twin carby?
I've heard theres no performance gain, but does it make much difference to the well-being of the engine?

**EGJOE** · 15-04-2010 01:04 PM

i put 98 in my mower and trimmer works better ..........

**cristian** · 15-04-2010 04:08 PM

my bum dyno couldn't tell the difference between 95 and 98 ron when i had my old dual carb...

**Mikecivic78** · 16-04-2010 07:44 PM

98 octane is for high-compression engines. Unless ur engine has upgraded compression (machined head), theres no point in using 98. It's real expensive, with my b16a2, due to it's compression ,98 is the recommended juice. With a stock dual carb car, you may as well use 91 octane or maybe 95 if u can afford it from a reputable supplier.

Stay away from e10 (ethanol added).

I would use Moblil 91 octane in your situation.

Higher octane won't be better for your engine, and if it is, the difference won't be apparent.

**EGJOE** · 20-04-2010 04:52 PM

just try it and compare ecconomy

**im.Kusuma** · 20-04-2010 06:16 PM

i use mobil premium unleaded the 98 octane one.. Dual carb.. Car has been drinking it for the last 4 years since previous owner too.
When i compared it with normal unleaded, i could here some rattling noise on low rpm.. but when i use premium, it was gone .. and it had better acceleration and engine response too.. lol

lol (i lied bout the last bit haha)

**xntrik** · 20-04-2010 06:16 PM

Better off using normal 95 ron cheaper, does the same sh!t.

**MWAKU** · 20-04-2010 09:50 PM

I've heard theres no performance gain, but does it make much difference to the well-being of the engine?

no difference in the well-being of the engine at all as xntrik said. if u use 95ron, and ur car pings under load under 3k revs, then you should swap back. just go by whatever it says in the owners manual.