None of that 'old style' performance stuff really does not matter, due to it being aspirated.

Increasing displacement will, if the turbo and ECM are adjusted.

 

Interesting...Have any before/after data on these little booger motors.

D.

 

Interesting...Have any before/after data on these little booger motors.

D.

huh? Physics dictate that.

 

Thank You...a great post.

 

The HP and TQ you're talking with P&P heads, is minisucle compared to a tune.
That's why I said, you're gonna pay LOADS of money for minimal gains, no way
would I pay $3000.00 for port matching the intake, then P&P the exhaust side,
not enough gain for that kind of money, BUT, it does help, but at a steep cost by
comparison to tunes. We're also talking gas engines, and not diesels, but still, there
are some benefits, but not like in a gas motor.

If you would spend the 3K on an upgraded Turbo, tune, and exhaust, you're gonna
FAR outweigh the gains of porting.

Porting the heads provides the finely detailed attention required to bring the engine to the
highest level of efficiency by an increase in volumetric efficiency. More than any other single
factor, porting is responsible for the high power output of many modern engines.

Now when it comes to diesel head porting, you have to be very careful how
you do it. The fact is though, all turbocharged engines will benefit drastically
if cylinder head porting is done correctly. IF not done right, you can blow a lot
of smoke when the motor is cold, when more fuel is being used due to the colder
air charge. You can also have casting strength issues under boost. Exhaust
porting also effects the turbo spool time, too big of a port, you get more lag.

Porting reduces the restriction in the engine's intake and exhaust chambers. Reduce the
restrictions, you let more air into the cylinders. If you have more air, you can add more fuel.
The result is increased horsepower, period, diesel engine or not. You will need a tune
and exhaust to take full advantage of the job.

With a stock setup like on a TDI, you'll notice the difference without a tune or anything else, but is it worth the money...

It's never a BAD idea to port, but is a BAD idea if it's not done right, or you don't know what
you're doing.

If you wanna port your heads, go right ahead, don't let other people make your straw
in the sunlight.

The HP and TQ you're talking with P&P heads, is minisucle compared to a tune.
That's why I said, you're gonna pay LOADS of money for minimal gains, no way
would I pay $3000.00 for port matching the intake, then P&P the exhaust side,
not enough gain for that kind of money, BUT, it does help, but at a steep cost by
comparison to tunes. We're also talking gas engines, and not diesels, but still, there
are some benefits, but not like in a gas motor.

If you would spend the 3K on an upgraded Turbo, tune, and exhaust, you're gonna
FAR outweigh the gains of porting.

Porting the heads provides the finely detailed attention required to bring the engine to the
highest level of efficiency by an increase in volumetric efficiency. More than any other single
factor, porting is responsible for the high power output of many modern engines.

Now when it comes to diesel head porting, you have to be very careful how
you do it. The fact is though, all turbocharged engines will benefit drastically
if cylinder head porting is done correctly. IF not done right, you can blow a lot
of smoke when the motor is cold, when more fuel is being used due to the colder
air charge. You can also have casting strength issues under boost. Exhaust
porting also effects the turbo spool time, too big of a port, you get more lag.

Porting reduces the restriction in the engine's intake and exhaust chambers. Reduce the
restrictions, you let more air into the cylinders. If you have more air, you can add more fuel.
The result is increased horsepower, period, diesel engine or not. You will need a tune
and exhaust to take full advantage of the job.

With a stock setup like on a TDI, you'll notice the difference without a tune or anything
else, but is it worth the money...

It's never a BAD idea to port, but is a BAD idea if it's not done right, or you don't know what you're doing.

If you wanna port your heads, go right ahead, don't let other people make your straw in the sunlight.

I'm in total agreement with you.

Just so it's known. I'm not new to racing engines. I've been pushing boosted motors for over 30 years. I'm one of the first to port heads on a GN (Grand National). I've ported everything from a 1.8L ITR, V6, V8's, V10's and V12's and my favorite an 1100ci V8 pro-mod. But...never a diesel.

This is just a fun toy project for me. As far as cost....I've spend more money on set Valves than what a whole TDI engine costs lol.

The simple truth is...head porting gets you that extra. Race teams spend BILLLIONS every year to get the best heads. I've been paid well over the years. Now that I've retired...it's time for some fun projects.

 

The flow is regulated by the turbo. (lets call that induction). When you have induction, then everything is regulated.

The flow and openings of the head, matters EXPONENTIALLY less.

The turbo will force 2 bars in to the combustion chamber. It DOES NOT MATTER how ported/polished the port is.

Porting and polishing is only useful on natural induction. BECAUSE THE AIR IS FALLING IN/DRAWN IN BY the pistons causing a cavitation (AKA down stroke) that makes a low pressure..

But you remove that aspect: PUSH the air in. Then you can forget any SMALL RESISTANCE. Let alone the fuel is atomized and sprayed directly in to the head (Kinda a second reason it would be useful).

So you pay $1000 per HP (maybe a bit less). NOW THAT IS STUPID. Because you think that one technology(NA) will transfer to a different technology(T DI). And those gains will be only seen on the exhaust side work.

If you still do not understand, go get some education.

---
Now I will explain it like as if to a child:

Which one will perform best aerodynamically in a vacuum?

A: VW Thing
B: VW Bug
C: VW LT250
D: lamborghini (your choice)

All will perform equally (aerodynamically). Because the question self canceled. (Though your arguing D).

Induction, for the most part, will remove any "flow design" issues. as does a vacuum (though less effective) .

Yes mechanical changes to the head (cam, positions of anything, CnC chamber) can all add up.

Your question was, "port/polish" will it matter much?

I am here to say, you may gain 1-2hp per $1000 of bench work. AT BEST. with an INDUCTED air system vehicle. TDI in this case. Is STUPID!

I realize that back in the day, 10-20 hp for a cheap P&P on a NA car. Making it 1-2HP per $100

:deadhorse

---
So lets hear your logic on why or how:

Porting (Heck you can polish this side to, no fuel in here) a head on a TDI stock setup, will make a difference under 1.4 bar pressure system.(BTW porting is opening the intake side by removing material) I guess we can call that "induction" side?

Porting/polishing the exhaust side...'''


Go...

:thumbsup

 

The flow is regulated by the turbo. (lets call that induction). When you have induction, then everything is regulated.

The flow and openings of the head, matters EXPONENTIALLY less.

The turbo will force 2 bars in to the combustion chamber. It DOES NOT MATTER how ported/polished the port is.

Porting and polishing is only useful on natural induction. BECAUSE THE AIR IS FALLING IN/DRAWN IN BY the pistons causing a cavitation (AKA down stroke) that makes a low pressure..

But you remove that aspect: PUSH the air in. Then you can forget any SMALL RESISTANCE. Let alone the fuel is atomized and sprayed directly in to the head (Kinda a second reason it would be useful).

So you pay $1000 per HP (maybe a bit less). NOW THAT IS STUPID. Because you think that one technology(NA) will transfer to a different technology(T DI). And those gains will be only seen on the exhaust side work.

If you still do not understand, go get some education.

---
Now I will explain it like as if to a child:

Which one will perform best aerodynamically in a vacuum?

A: VW Thing
B: VW Bug
C: VW LT250
D: lamborghini (your choice)

All will perform equally (aerodynamically). Because the question self canceled. (Though your arguing D).

Induction, for the most part, will remove any "flow design" issues. as does a vacuum (though less effective) .

Yes mechanical changes to the head (cam, positions of anything, CnC chamber) can all add up.

Your question was, "port/polish" will it matter much?

I am here to say, you may gain 1-2hp per $1000 of bench work. AT BEST. with an INDUCTED air system vehicle. TDI in this case. Is STUPID!

I realize that back in the day, 10-20 hp for a cheap P&P on a NA car. Making it 1-2HP per $100

:deadhorse

---
So lets hear your logic on why or how:

Porting (Heck you can polish this side to, no fuel in here) a head on a TDI stock setup, will make a difference under 1.4 bar pressure system.(BTW porting is opening the intake side by removing material) I guess we can call that "induction" side?

Porting/polishing the exhaust side...'''


Go...

:thumbsup

Take a fluid dynamics class kid.

You honestly can't be serious that these heads are perfect from the factory can you?

What engineering degree do you have and how many years of experience?

What head development experience do you have?

What head porting experience do you have?

@13TDiDude , you Sir...are wise.