Could be for meth port or something. I just don't understand why they did that when it could have gone straigt down and around istead of perpindicular.
V
My GTX3071r build
- Thread starter 160hunter
- Start date
Could be for meth port or something. I just don't understand why they did that when it could have gone straigt down and around istead of perpindicular.
I believe conglomerategti said this was due to axle clearance
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I had to rearrange the dischrage piping and turbo to get it to fit properly. The turbo had to be turned down a little and the discharge coupler coming off the turbo had to be turned 90* to the left. It is a lot more compact now than what is in the pics above. Got my tune. It is super fast and I haven't even gone nuts yet. Having rough idle issues right now. The RPM's drop real low when I come to a stop or hold in the clutch. Sometimes it stalls.
Tmsracing37
Boosty McFlamin Job
- Location
- MD
- Car(s)
- 06 GTI
I don’t remember ever reading or saying that the piston design affects spray pattern, but it does affect how the charged air and fuel is being compressed near and at top dead center of a piston stroke. This can change the characteristics of how air and fuel are mixed
BK@Prime
Ready to race!
- Car(s)
- MKV GLI DSG
Haha all to true with the charge piping of the ATP kit. I still have to custom fab. mine so it doesnt rub the cross support. And with the lower 9.5/1 cr the flat dish pistons should be fine. I'm running RS4's, an almost identical turbo(gt3071r), same pistons and she runs good! I little rough on the cold starts but i believe that's just the cold blooded RS4s for ya.
BK
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I am here: http://maps.google.com/maps?ll=34.039306,-118.147595
Sent from Planet Earth.
CoNGLoMeRaTeGTi
Banned
- Location
- TRuCHoLaND Ny
- Car(s)
- MKV
A former member, GolfRS, was spewing BS throughout the community, claiming the shape of the piston help stratify the fuel better.
IT'S BOGUS.
What you're saying is true for all car theoretically.
But what I'm saying is crowned or flat it's not changing shit about the homogenization of fuel/air within our platform.
People hyping up crown pistons to be better than flat/dish isn't doing anything but raising the price of crown pistons and lowering that of flat/dish.
Go with whatever company you feel comfortable with. I've always used JEs in my chevys, hondas, subarus, and now VWs.
mrbikle
Go Kart Champion
- Location
- Hagerstown MD
if you say so.
Tmsracing37
Boosty McFlamin Job
- Location
- MD
- Car(s)
- 06 GTI
Matt you drunk again?
mrbikle
Go Kart Champion
- Location
- Hagerstown MD
well how else are we suppose to add turbulence. a crowned does a hell of alot more then a flat top or dished... thats basic shit man.
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I am not an engineer, but I would have to imagine VW chose the particular type of piston they put into the car from the factory for a reason and I can't help but assume it wasn't cost. Now, what their reasons were I do not know, however we can all speculate and come up with scenarios. But there are two things I would consider, firstly there must be a difference between crowned, dished, flat, otherwise there would be no reason to make different styles. Secondly, putting different style pistons must make some sort of difference if the different styles indeed are different, now whether that difference is significant or not, and positive or negative, I do not know and I don't really think there is enough empirical evidence to say otherwise. So unless we can get a VW engineer with knowledge of or some sort of documentation of why they used the dished pistons they did, we will probably never really know...
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mrbikle
Go Kart Champion
- Location
- Hagerstown MD
yea, and they didnt intend for us to use a narrow spray pattern injector either that was designed for a v8. When adding non-optimal injectors, you need to add something that will help mix everything together.
The driver was Nik, the videographer was Jonny, I'm the big guy in the B6 A4 video.
With regard to the turbo we used on our MK5, it was a Billet Precision CEA 5557SP-B 63ar T31 4 bolt. This turbo has been replaced by the 5558, as the 57mm is the 'old style' turbine wheel. Similar to how precision changed from the HP 6765 to the HP 6766, they're always coming out with new wheel designs based on their experience racing.
cheers,
Clay
CoNGLoMeRaTeGTi
Banned
- Location
- TRuCHoLaND Ny
- Car(s)
- MKV
That would work if we truly used Fuel Stratified Injection. Sadly, we don't. VW just decided it would be a cool acronym to add into our engine covers. Find me coding in the MED9.1 using our software versions (not the Benz or NA platforms) that has stratified coding. It won't exist we use LSB and MSB, which are homogenous.
It's should really be HDI, Homogenous Direct Injection. So there is no need for crowned pistons or flappers, period.
Crowned pistons and flappers are essential for the NA DI platforms.
RRacerguy717
Go Kart Champion
- Location
- ny tristate
Wossner style crowns pistons help with quench and help purging spent gases out of the cylinders so pumping loss especially at higher rpm should be less. But like every pro there is a con it being usually in general engine design with more quench hurts cyl head flow. I'm interested in how mr bike engine performs and behaves with these pistons. Bob. G :thumbsup: