Engine Code Difference - CYMC vs DBPA
AudiWorld Junior Member
Joined: May 2013
Posts: 7
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Thank you very much SMac770 for such a thorough and very informative post. If only the CYRB engines come with this it makes it very limited what I can find.
My current vehicle MY06 Audi A6 3.2 FSI Quattro with around 83,000 miles, engines still runs fine but I have also stuck to premium fuel if that helps.
I wonder if Audi has thought of a way to service the dirty valves from carbon - probably not...
My current vehicle MY06 Audi A6 3.2 FSI Quattro with around 83,000 miles, engines still runs fine but I have also stuck to premium fuel if that helps.
I wonder if Audi has thought of a way to service the dirty valves from carbon - probably not...
AudiWorld Super User
Joined: Dec 2001
Posts: 13,933
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From: Georgia
I assume you'd walnut blast the valves same as we do for the 2.0T. Walnut blasting a C6 3.2L V6:
www.youtube.com/watch?v=dDQ006hVAVA
edit - I get your point now; you want an MPI engine so you don't have to deal with the carbon issue of the early FSI engines. Are others with Gen3 evo engines having carbon issues? I've got 222k miles on my Gen2 engine and though I've done a rudimentary cleaning two times along the way, there was never any carbon build up of significance and the cleaning made 0 impact on engine operation. Others have had significant carbon such that idling was rough among other issues.
www.youtube.com/watch?v=dDQ006hVAVA
edit - I get your point now; you want an MPI engine so you don't have to deal with the carbon issue of the early FSI engines. Are others with Gen3 evo engines having carbon issues? I've got 222k miles on my Gen2 engine and though I've done a rudimentary cleaning two times along the way, there was never any carbon build up of significance and the cleaning made 0 impact on engine operation. Others have had significant carbon such that idling was rough among other issues.
Last edited by SMac770; Apr 7, 2021 at 08:49 AM.
AudiWorld Junior Member
Joined: May 2013
Posts: 7
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I have never had any reason to carbon clean my 3.2 FSI engine. On the other hand I haven't inspected the valves but the engine has run fine. (less complimentary about the chains and oil tensioners. Had to have specialist replace the chains and tensioners where some of the parts had been updated by Audi. Been running perfectly since that.)
You are absolutely correct, I am looking for the most reliable car possible. My current Audi is V6 so may be less prone to carbon build up, I have no idea. However, now that we are aware of the issue I would like to chose the best car/engine possible. That's why I am trying to find one with MPI but I suspect it will be difficult (especially as I have a long wish list concerning the options and extras).
You are absolutely correct, I am looking for the most reliable car possible. My current Audi is V6 so may be less prone to carbon build up, I have no idea. However, now that we are aware of the issue I would like to chose the best car/engine possible. That's why I am trying to find one with MPI but I suspect it will be difficult (especially as I have a long wish list concerning the options and extras).
AudiWorld Newcomer
Joined: Apr 2026
Posts: 1
Likes: 1
The engines DBPA and CYMC have different compression ratio 9,6:1 and 11,7:1. The compression ratio has been increased from 9.6:1 to
11.7:1 by reducing the volume of the compression
chamber.
> Modified squish zones in the combustion chamber.
> Lowering of combustion chamber ceiling by 9 mm.
> Modified piston shape.
> The intake ports have been redesigned, that is, made
straighter, to optimize charging motion.
>The positions of the spark plug and high-pressure inject-
tor as well as the shape of the piston have been adapted
to the new combustion chamber design.
> Valve guide housings, modified for better heat dissipation.
>Double-lip exhaust valve stem seals.
https://static.nhtsa.gov/odi/tsbs/20...05867-2280.pdf
11.7:1 by reducing the volume of the compression
chamber.
> Modified squish zones in the combustion chamber.
> Lowering of combustion chamber ceiling by 9 mm.
> Modified piston shape.
> The intake ports have been redesigned, that is, made
straighter, to optimize charging motion.
>The positions of the spark plug and high-pressure inject-
tor as well as the shape of the piston have been adapted
to the new combustion chamber design.
> Valve guide housings, modified for better heat dissipation.
>Double-lip exhaust valve stem seals.
https://static.nhtsa.gov/odi/tsbs/20...05867-2280.pdf
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