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CBU from 100% gas vs Ethanol in GDI application #4443740
06/28/17 11:28 AM
06/28/17 11:28 AM
Joined: Apr 2017
Posts: 405
Mississippi
Speak2Mountain Offline OP
Speak2Mountain  Offline OP
Joined: Apr 2017
Posts: 405
Mississippi
Would it seem to be better?

Worse?

Or prolly about the same

Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain] #4443913
06/28/17 01:34 PM
06/28/17 01:34 PM
Joined: Aug 2003
Posts: 12,910
NE,Ohio
Rand Online content
Rand  Online Content
Joined: Aug 2003
Posts: 12,910
NE,Ohio
What is CBU that's not a common abbreviation.


2019 Jeep Cherokee Trailhawk 2.0T
Re: CBU from 100% gas vs Ethanol in GDI application [Re: Rand] #4443953
06/28/17 02:06 PM
06/28/17 02:06 PM
Joined: Apr 2017
Posts: 405
Mississippi
Speak2Mountain Offline OP
Speak2Mountain  Offline OP
Joined: Apr 2017
Posts: 405
Mississippi
My bad. Carbon buildup

Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain] #4443955
06/28/17 02:10 PM
06/28/17 02:10 PM
Joined: Oct 2014
Posts: 11,865
Idaho
CT8 Online content
CT8  Online Content
Joined: Oct 2014
Posts: 11,865
Idaho
Why would you ask?


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: CBU from 100% gas vs Ethanol in GDI application [Re: CT8] #4444027
06/28/17 03:28 PM
06/28/17 03:28 PM
Joined: Apr 2017
Posts: 405
Mississippi
Speak2Mountain Offline OP
Speak2Mountain  Offline OP
Joined: Apr 2017
Posts: 405
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

Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain] #4444045
06/28/17 03:45 PM
06/28/17 03:45 PM
Joined: Nov 2011
Posts: 3,950
Lima, Ohio, USA
earlyre Offline
earlyre  Offline
Joined: Nov 2011
Posts: 3,950
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...

Last edited by earlyre; 06/28/17 03:46 PM.

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Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain] #4444061
06/28/17 03:54 PM
06/28/17 03:54 PM
Joined: Oct 2008
Posts: 19,097
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,097
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.


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain] #4444252
06/28/17 08:02 PM
06/28/17 08:02 PM
Joined: Dec 2003
Posts: 9,810
Florida, Cape Coral
Eddie Offline
Eddie  Offline
Joined: Dec 2003
Posts: 9,810
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


CX5 Touring 2.5L :-)
Re: CBU from 100% gas vs Ethanol in GDI application [Re: SteveSRT8] #4444588
06/29/17 07:37 AM
06/29/17 07:37 AM
Joined: Nov 2003
Posts: 1,116
Middle of Iowa
DriveHard Offline
DriveHard  Offline
Joined: Nov 2003
Posts: 1,116
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.


Smile, it increases your face value
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Re: CBU from 100% gas vs Ethanol in GDI application [Re: DriveHard] #4444693
06/29/17 09:14 AM
06/29/17 09:14 AM
Joined: Oct 2008
Posts: 19,097
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,097
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.

Last edited by SteveSRT8; 06/29/17 09:16 AM.

"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: CBU from 100% gas vs Ethanol in GDI application [Re: Eddie] #4444696
06/29/17 09:15 AM
06/29/17 09:15 AM
Joined: Oct 2008
Posts: 19,097
Sunny Florida
SteveSRT8 Offline
SteveSRT8  Offline
Joined: Oct 2008
Posts: 19,097
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!


"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix
Re: CBU from 100% gas vs Ethanol in GDI application [Re: Speak2Mountain] #4445068
06/29/17 02:58 PM
06/29/17 02:58 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
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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