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Ok, so not knowing anything about the PD130 engine other than the obvious, I'll be in the market to get some head work carried out soon to get it flowing a bit better for a bigger turbo in the very near future.

 

Does anyone know how much head work would likely set me back? I'm assuming that it's just the ports that will need enlarging to allow it to flow better, and the manifolds matching?

 

Budget constraints mean that I'm not looking for bigger valves as well.

 

How much of a difference is this realistically going to make towards a goal of 300bhp on diesel alone when combined with a cam, nozzles and a bigger turbo?

 

Any specialists for these heads out there that are reasonably priced and know what they're doing? Again, I'm assuming that just any old head modifying won't do, and that it would need material removing from selective areas and put on a flow bench?

 

 

Thanks all!

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My head has been ported (twice) now by Jabbasport - both times I never really knew what they did, but they seemed to know what they were doing.  Next I think I need to look at getting it done again and going down the uprated valves and springs throughout process.  Priced this up at about £1.5k at cheapest.

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I can get it done CHEAP its who u know mines being done as we speak

 

You do understand that there's no such thing as a cheap flow job, cylinder head mods must be fully developed with the facts and figures to back them up, you can't just hog out the ports, give it a spit shine and expect it to perform.

 

A bad head job will make the car WORSE, not better.

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You do understand that there's no such thing as a cheap flow job, cylinder head mods must be fully developed with the facts and figures to back them up, you can't just hog out the ports, give it a spit shine and expect it to perform.

 

A bad head job will make the car WORSE, not better.

found a lot more power on my vxr well known company they do work for main dealers and motor sport companys  aswell and I know them by name only 3 miles from me we'll see the difference when me and alex meet again

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found a lot more power on my vxr well known company they do work for main dealers and motor sport companys  aswell and I know them by name only 3 miles from me we'll see the difference when me and alex meet again

 

Ok, but why is it a secret who's doing the work?

 

Turbodiesel headwork is totally different to petrol headwork, just enlarging the ports reduces swirl, slows spool and generally loses performance, careful attention to the short-side radius, cylinder entry angle and multi-angle valve seats with back-cut inlet valves are about all you need to do unless you're having bigger inlet valves fitted, in which case the inlet ports can be opened up a little to suit, the problem is you generally need to do piston mods to clear the new valve heads.

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As above really - I was always of the mindset that headwork not done correctly would actually be worse for air flow. Hence really I'd be wanting it done by someone experienced with these heads.

 

Anyone got any recommendations of specialists for these along with rough costs?

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My head has been ported (twice) now by Jabbasport - both times I never really knew what they did, but they seemed to know what they were doing.  Next I think I need to look at getting it done again and going down the uprated valves and springs throughout process.  Priced this up at about £1.5k at cheapest.

 

 

How much did the work cost you for porting from Jabba please Jason?

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How much did the work cost you for porting from Jabba please Jason?

he put prices above m8 well mines being done and when u see the proof on the dyno i'll just add £100 on top for the non believers

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he put prices above m8 well mines being done and when u see the proof on the dyno i'll just add £100 on top for the non believers

 

Cylinder head gasflow is a science Steve, not art or religion, belief isn't involved. I've seen a lot of really bad head work in my time that looked really shiny and smart but lost power all the way through the range until the very top end when it finally caught up.

 

You may well get a bigger headline but if it's at the expense of spool and midrange then the car will smoke like a chimney and drive badly and I for one will not be impressed in the slightest. That Newman cam hasn't made the slightest difference either incidentally.

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he put prices above m8 well mines being done and when u see the proof on the dyno i'll just add £100 on top for the non believers

Presume your getting a decent map then? :D

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Have a look on TDICLUB for many discussions about porting. From the original TDI, through PD to current CR diesels.

There's a lot of input over there, from various European tuners and enthusiasts, not just the Americans.

 

When it comes to TDIs it's all too easy to stuff it up (apparently). Most work seems to concentrate on the exhaust side.... I guess part of that is a feeling that it's all post-combustion and free of the risks of screwing up the burn.

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Have a look on TDICLUB for many discussions about porting. From the original TDI, through PD to current CR diesels.

There's a lot of input over there, from various European tuners and enthusiasts, not just the Americans.

 

When it comes to TDIs it's all too easy to stuff it up (apparently). Most work seems to concentrate on the exhaust side.... I guess part of that is a feeling that it's all post-combustion and free of the risks of screwing up the burn.

looking at the exhaust side theres 2mm on each port that can be machined out which imo is going to make a difference have my head back in a week and going to put it on the same rolling road to see the difference

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looking at the exhaust side theres 2mm on each port that can be machined out which imo is going to make a difference have my head back in a week and going to put it on the same rolling road to see the difference

 

The trouble is that enlarging the CSA of the exhaust port slows the gas stream and therefore slows turbo spool, remember that port CSA only needs to be about 85% of valve head diameter in order to offer no restriction and given that diesels rev slower than petrols then 80% is probably fine because you want the gas stream to be moving as fast as possible without restricting flow.

 

IMO means 'in my opinion' Steve, your opinion is absolutely worthless if you've no idea what you're talking about.

 

OTOH you may well have calculated valve area and existing port CSA and compared them so as to arrive at your opinion, but I doubt it because you'd also need to calculate volume for each port so that net flow and velocity matches across all four cylinders.

 

It isn't rocket science but you'd need a scientific calculator and a set of verniers at the very least.

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The trouble is that enlarging the CSA of the exhaust port slows the gas stream and therefore slows turbo spool, remember that port CSA only needs to be about 85% of valve head diameter in order to offer no restriction and given that diesels rev slower than petrols then 80% is probably fine because you want the gas stream to be moving as fast as possible without restricting flow.

 

IMO means 'in my opinion' Steve, your opinion is absolutely worthless if you've no idea what you're talking about.

 

OTOH you may well have calculated valve area and existing port CSA and compared them so as to arrive at your opinion, but I doubt it because you'd also need to calculate volume for each port so that net flow and velocity matches across all four cylinders.

 

It isn't rocket science but you'd need a scientific calculator and a set of verniers at the very least.

we'll see

 

hmmm set of verniers the pd130 got single cam m8 lol

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please tell me your joking Steve? :)

 

He doesn't need 'em, just one shrewd glance from his experienced eye can judge ten thou from ten feet away.

 

Calipers are for legs, amirite Steve?  :D

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