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#4443740 - 06/28/17 11:28 AM CBU from 100% gas vs Ethanol in GDI application
Speak2Mountain Offline


Registered: 04/07/17
Posts: 347
Loc: Mississippi
Would it seem to be better?

Worse?

Or prolly about the same

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#4443913 - 06/28/17 01:34 PM Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain]
Rand Offline


Registered: 08/20/03
Posts: 12650
Loc: NE,Ohio
What is CBU that's not a common abbreviation.
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#4443953 - 06/28/17 02:06 PM Re: CBU from 100% gas vs Ethanol in GDI application [Re: Rand]
Speak2Mountain Offline


Registered: 04/07/17
Posts: 347
Loc: Mississippi
My bad. Carbon buildup

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#4443955 - 06/28/17 02:10 PM Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain]
CT8 Offline


Registered: 10/09/14
Posts: 10989
Loc: Idaho
Why would you ask?
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#4444027 - 06/28/17 03:28 PM Re: CBU from 100% gas vs Ethanol in GDI application [Re: CT8]
Speak2Mountain Offline


Registered: 04/07/17
Posts: 347
Loc: Mississippi
I've gotta a GDI engine and have access to 100% gasoline (93 octane), just wondering if it MIGHT prevent carbon in an engine known for some really bad buildup

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#4444045 - 06/28/17 03:45 PM Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain]
earlyre Offline


Registered: 11/22/11
Posts: 3865
Loc: Lima, Ohio, USA
now I'm no scientist/engineer/mechanic, but to my understanding, the FUEL isn't the problem with DI carbon buildup, it's where the fuel is delivered.
with port, or even tbi, the fuel "washes" the backside of the valves.

if it's really bad, you'd be better off figuring out how to add a single injector after the throttle body...

you'll notice some manufacturers, while never acknowledging there was a carbon problem, have redesigned the next generation of those engines with both port and direct injection...


Edited by earlyre (06/28/17 03:46 PM)
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#4444061 - 06/28/17 03:54 PM Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18954
Loc: Sunny Florida
At least two large ones have said that the combined systems are for part throttle cylinder filling issues, evidently some issues with this with DI.

It should also be noted that many many DI owners never have any significant issues from some makes and models. I am not certain this is all engineering expertise but it may be a driver thing.

No one could use a single injector at the throttle body unless they completely redesign the intake to avoid cylinder to cylinder distribution issues.
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#4444252 - 06/28/17 08:02 PM Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain]
Eddie Offline


Registered: 12/07/03
Posts: 9569
Loc: Florida, Cape Coral
Mazda Skyactv engines seems to have solved the issue by designing a nice oil vapor separator in the PCV system. Mazda also found that running the intake valves at a higher temperature helped. My old Mazda CX7 with DI was doing great when I sold it at ~ 80,000 miles with their "OLD" PCV system. Ed
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#4444588 - 06/29/17 07:37 AM Re: CBU from 100% gas vs Ethanol in GDI application [Re: SteveSRT8]
DriveHard Offline


Registered: 11/24/03
Posts: 1070
Loc: Middle of Iowa
Originally Posted By: SteveSRT8
At least two large ones have said that the combined systems are for part throttle cylinder filling issues, evidently some issues with this with DI.

It should also be noted that many many DI owners never have any significant issues from some makes and models. I am not certain this is all engineering expertise but it may be a driver thing.

No one could use a single injector at the throttle body unless they completely redesign the intake to avoid cylinder to cylinder distribution issues.


Huh? Throttle body injection was huge in the 90's...and you can still buy throttle body injection kits for use on SBC's today. I think it would be quite simple to integrate a single injector in these DI systems for part throttle operation and reduced carbon build up.
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#4444693 - 06/29/17 09:14 AM Re: CBU from 100% gas vs Ethanol in GDI application [Re: DriveHard]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18954
Loc: Sunny Florida
Originally Posted By: DriveHard
Originally Posted By: SteveSRT8
At least two large ones have said that the combined systems are for part throttle cylinder filling issues, evidently some issues with this with DI.

It should also be noted that many many DI owners never have any significant issues from some makes and models. I am not certain this is all engineering expertise but it may be a driver thing.

No one could use a single injector at the throttle body unless they completely redesign the intake to avoid cylinder to cylinder distribution issues.


Huh? Throttle body injection was huge in the 90's...and you can still buy throttle body injection kits for use on SBC's today. I think it would be quite simple to integrate a single injector in these DI systems for part throttle operation and reduced carbon build up.


Ever since port injection the manifolds are designed for air only. If you examine most manifolds that move fuel and air (carburetor/TB) they are heated and radically different than modern ones for FI. So you cannot just mount an injector behind the TB without redoing the manifold design first.


Edited by SteveSRT8 (06/29/17 09:16 AM)
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#4444696 - 06/29/17 09:15 AM Re: CBU from 100% gas vs Ethanol in GDI application [Re: Eddie]
SteveSRT8 Offline


Registered: 10/10/08
Posts: 18954
Loc: Sunny Florida
Originally Posted By: Eddie
Mazda Skyactv engines seems to have solved the issue by designing a nice oil vapor separator in the PCV system. Mazda also found that running the intake valves at a higher temperature helped. My old Mazda CX7 with DI was doing great when I sold it at ~ 80,000 miles with their "OLD" PCV system. Ed


yep, some mfgrs obviously have it figured out. I still think driving style plays a huge part as well, evidenced by the advice to drive them at high rpm for a period to clean the intake valves. Some of us do that every time we drive them!
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Best ET-12.79 @ 111 mph
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Just like we go to Publix

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#4445068 - 06/29/17 02:58 PM Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: toronto
Originally Posted By: Speak2Mountain
I've gotta a GDI engine and have access to 100% gasoline (93 octane), just wondering if it MIGHT prevent carbon in an engine known for some really bad buildup


Doubt it will make a lick of difference bud.

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