98 octane in carby?

[pablos8]

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]

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

[cristian]

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

[Mikecivic78]

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]

just try it and compare ecconomy

[im.Kusuma]

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]

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

[MWAKU]

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.

[vtecing]

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

2 stroke is completely different

[trism]

98 octane fuels generally have additives to help clean the fuel system/inside of the engine, and you will get better economy,

[im.Kusuma]

98 octane fuels generally have additives to help clean the fuel system/inside of the engine, and you will get better economy,

that is very true!!

[chunky]

wow didnt know that

[02gzm]

98 octane fuels generally have additives to help clean the fuel system/inside of the engine, and you will get better economy,

The detergents in fuel only really benefit a fuel injected car as they're there to clean the injectors. It'd be more effective to clean out the carby manually every 10,000km's.
You'll also find that all fuels from the same company will have the same amounts of detergents in them. It's just a marketing ploy when they talk about the cleaning agents in high octane fuel.

And as previously stated, any power gains you feel from using 98ron fuel in a low compression engine are just a placebo effect.

[Mikecivic78]

The detergents in fuel only really benefit a fuel injected car as they're there to clean the injectors. It'd be more effective to clean out the carby manually every 10,000km's.
You'll also find that all fuels from the same company will have the same amounts of detergents in them. It's just a marketing ploy when they talk about the cleaning agents in high octane fuel.

And as previously stated, any power gains you feel from using 98ron fuel in a low compression engine are just a placebo effect.

Very well said. Stick to good old 91 octane for your carby (stay away from e10). Using 95 or 98 on your car is very simply a waste of money. EFI cars can benefit from higher octane fuel, but 98 is best for use in high compression engines like the b16a/b18c/K20a.

A higher octane fuel is more resistant to detonation, or pinging as it is known, so Hi-comp engines need the high priced good stuff. Check this: http://74.125.153.132/search?q=cache:dJmgcy5vbPIJ:en.wikipedia.org/wiki/Octane_rating+A+higher+octane+fuel+is+more+resista nt+to+detonation&cd=1&hl=en&ct=clnk&gl=au

[EGJOE]

2 stroke is completely different

i got a 4 stroke mower 2 stroke trimmer seems to have more grunt havent dynoed yet lol

[4age8u]

I use 98 on anything i own/drive even my carby eg/corolla 4 strock mower pit bike etc etc

[nugget666]

stick to 91 imo

[503asy]

i had an ed civic, didnt notice performance gains. In terms of economy, (my brother an accountant with spare time lol) worked out that it was basically the same price as regular fuel when comparing the distance travelled to the price paid.