Engine Specific Info and Questions > mTDI Mechanical TDI Conversions

Thoughts on mTDI AHU head porting

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RabbitJockey:
in this video holdener gets a 10% increase in flow from just doing the basics.

https://www.youtube.com/watch?v=6o3SaUtfai8

I also did a 3 angle valve job and back cut all 8 valves on my head. It doesn't run yet so i can't tell you how well that stuff works. plus its not like i had a before and after flow test. But these are cheap mods the machine shop can do to improve flow.

also now that i've thought about it more, if you're going to be modifying the head you really want to a bigger turbo. the k14 is great for low end power but it can only flow maybe 125hp and the stock head can easily move that much air at low boost. You really want to choose a power goal and build to that.

jhax:
Thank you for the replies. As far as HP and torque goals are concerned. I am looking at maybe 110HP out of this. Remember it is going into a vehicle with the aerodynamics of a brick and heavy. I kept the K14 because of it's early spooling throughout the rev range and I plan on not allowing it to go above 18PSI. I understand that I can get much more HP and torque with the LR IP but, once again, heavy brick. I am aware of the swirl bump in the intake ports, which assists with atomization of the fuel and air. My plan is to smooth it a bit, but from my understanding, the more it's reduced, the more the fuel just get dumped into the chamber and less efficient atomizaton, more heat, more black smoke. I also understand that the exhaust ports should remain smaller and it seems like that step from the head to the exhaust manifold allows the hot air to move quicker to the exducer, creating quicker spooling response. So with that information, port matching the exhaust ports may not be the ideal scenario. And smoothing out the intake chambers (opening up the bowls), grinding down the valve stems, and opening up the D ports, plus using some grinding paste on the valve seats and valves seems like the best option. What do we think?

RabbitJockey:
there is the swirl bump but there is also another one closer to the valve seat that is there to help prevent cracking from the location of the injector.

If I were you I wouldn't port the head because it's time consuming and the benefits aren't really worth it for 110hp.

if i were going to do it in your scenario I'd focus on just smoothing everything out and not enlarging or changing the shape of anything. only use sand paper cartridges, no burrs. this would hopefully help to gain efficiency with out losing any low speed power. Also definitely get a PD style intake, with the pd intake and very very mild porting it should run cooler and smoother.

jhax:
I was afraid of that, I already bought the burrs, oh well. I ended up getting the BRM intake, which, according to TDIClub research, is the one that provides the best air flow. Thanks for the information though!

RabbitJockey:
you're welcome, and good luck, hopefully you have an intercooler too.

The thing with your setup is if you increase the head flow too much it will out flow the turbo even at only 18psi which will make the turbo overspeed and this will obviously affect reliability.

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