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#4749411 - 05/06/18 03:09 PM DI vs Octane
Eddie Offline


Registered: 12/07/03
Posts: 9651
Loc: Florida, Cape Coral
I have seen several posts where it has been mentioned that the use of 91+ octane instead of the required 87 will help with reducing intake valve contamination. I would like to see some data or even a reason why this is possible. Ed
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#4749412 - 05/06/18 03:12 PM Re: DI vs Octane [Re: Eddie]
Char Baby Offline


Registered: 05/25/05
Posts: 10070
Loc: ROCHESTER, NY
I don't see how higher octane would change this considering the DI sprays straight down into the cylinder where as he port injection sprays on/past the intake valves to keep'em clean
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#4749422 - 05/06/18 03:24 PM Re: DI vs Octane [Re: Eddie]
Zee09 Offline


Registered: 05/05/18
Posts: 472
Loc: Tri State Conservative
I'd like to know if the combo of PI. And DI. Resolves the DI. Issues
or it it too early to tell? Very interesting topic.
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#4749423 - 05/06/18 03:24 PM Re: DI vs Octane [Re: Eddie]
PimTac Online   content


Registered: 03/04/17
Posts: 4615
Loc: Soviet State of Washington
I donít see the effect on valve deposits either. You might be confusing this with some reports that higher octane reduces fuel dilution of the oil.
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#4749426 - 05/06/18 03:29 PM Re: DI vs Octane [Re: Eddie]
OVERKILL Offline


Registered: 04/28/08
Posts: 36602
Loc: Ontario, Canada
I can't see it having any real effect on valve deposits. I've read on here that it leads to less fuel dilution in the oil, which I would expect the theory behind to be less enrichment for anti-knock required with higher octane fuel.
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#4749429 - 05/06/18 03:32 PM Re: DI vs Octane [Re: Eddie]
Dylan1303 Online   content


Registered: 10/14/15
Posts: 209
Loc: Washington
I thought premium had the most cleaning juice vs 87 at some stations. Shell comes to mind.
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#4749435 - 05/06/18 03:35 PM Re: DI vs Octane [Re: PimTac]
Superflop Offline


Registered: 07/01/09
Posts: 425
Loc: Seattle
Originally Posted By: PimTac
I donít see the effect on valve deposits either. You might be confusing this with some reports that higher octane reduces fuel dilution of the oil.
which may reduce pcv vapors depositing on the valves.. dunno though.
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#4749437 - 05/06/18 03:37 PM Re: DI vs Octane [Re: Dylan1303]
OVERKILL Offline


Registered: 04/28/08
Posts: 36602
Loc: Ontario, Canada
Originally Posted By: Dylan1303
I thought premium had the most cleaning juice vs 87 at some stations. Shell comes to mind.


It doesn't really matter. The requirements for Top Tier, which apply to all grades if the brand is wearing the banner, are quite high to begin with.
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#4749446 - 05/06/18 03:49 PM Re: DI vs Octane [Re: Dylan1303]
oldhp Online   content


Registered: 06/28/12
Posts: 1652
Loc: USA
Originally Posted By: Dylan1303
I thought premium had the most cleaning juice vs 87 at some stations. Shell comes to mind.


At one time Shell V-Power had five times more detergent than Shell's regular.
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#4749473 - 05/06/18 04:37 PM Re: DI vs Octane [Re: Eddie]
Speak2Mountain Offline


Registered: 04/07/17
Posts: 351
Loc: Mississippi
I've read that higher octane may help w/fuel dilution in DI engines.

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#4749487 - 05/06/18 05:06 PM Re: DI vs Octane [Re: Eddie]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7485
Loc: S California
The real problem is the vapors that get recycled thru the PCV and the lack of help from the additives in the gasoline that don't get to the valves, anymore.

This might be a good time to reconsider a catch can to trap much of the contaminants.

https://www.youtube.com/results?search_query=catch+can

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#4749516 - 05/06/18 05:49 PM Re: DI vs Octane [Re: OVERKILL]
oldmaninsc Offline


Registered: 09/25/06
Posts: 1581
Loc: California
Originally Posted By: OVERKILL
I can't see it having any real effect on valve deposits. I've read on here that it leads to less fuel dilution in the oil, which I would expect the theory behind to be less enrichment for anti-knock required with higher octane fuel.


I've mentioned this (less fuel dilution) after reading about it on another forum and after observing my own engine. Though I have heard people say about premium gasoline possibly reducing valve deposits, I agree I don't see how or why it could. I haven't seen any proof, just people saying what they thought. On a forum for my Impala, many believe running synthetic oil and changing it at 5K (or less) will help with the deposits and in the case of the 3.6 engine protect against timing chain problems. Not sure I agree with either but I have no proof either way!

In my area, premium fuel is usually 20 - 30 cents a gallon more, so it's not a big deal to fill up with premium (17 gallon tank). One guy on the Impala forum who uses the tuning software states there are different tables for premium fuel and I have seen a difference monitoring the fuel trims and the knock retard via Torque Pro.


Edited by oldmaninsc (05/06/18 05:52 PM)
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#4749527 - 05/06/18 06:03 PM Re: DI vs Octane [Re: oldhp]
oldmaninsc Offline


Registered: 09/25/06
Posts: 1581
Loc: California
Originally Posted By: oldhp
Originally Posted By: Dylan1303
I thought premium had the most cleaning juice vs 87 at some stations. Shell comes to mind.


At one time Shell V-Power had five times more detergent than Shell's regular.


On their current web page, they state that: "Shell V-Power NiTRO+ contains the highest concentration of the Shell Nitrogen Enriched Cleaning System and cleans up faster than Shell regular."

https://www.shell.us/motorist/shell-fuel...oline-faqs.html


Edited by oldmaninsc (05/06/18 06:03 PM)
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#4749530 - 05/06/18 06:06 PM Re: DI vs Octane [Re: Eddie]
Eddie Offline


Registered: 12/07/03
Posts: 9651
Loc: Florida, Cape Coral
As I thought. No reason to suspect that higher octane could reduce intake valve deposits as some have said. Ed
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#4749542 - 05/06/18 06:30 PM Re: DI vs Octane [Re: Eddie]
shanneba Offline


Registered: 07/10/04
Posts: 896
Loc: Indiana (IN)
87 octane gas may be less refined and have more impurities than 91.

https://www.sunocoracefuels.com/tech-article/octane-stability-high-octane-vs-low-octane-fuels

"87 octane fuels tend to be less refined and contain more unstable hydrocarbons.
As the months pass during storage these unstable components react to form gums, varnishes and lower octane hydrocarbons.
...
Even in proper storage 87 octane gas can start to degrade in 3 months, 93 octane fuel should last closer to 9 months before degradation is noticeable.
Keep in mind that 93 octane fuels are still susceptible to octane loss and vapor pressure decreases due to butane evaporation."
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