2.8 heads what is needed

[AudVW]

I have set of rebuild 2.8 heads. What supporting mods are needed and are there any modifications that need to actually be done to the heads them selves? I've heard of guys using the 2.8 cams but I know there needs to be bigger turbos for that. Any info would help

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[Corradovolksb]

You need to swap exhaust valves with 2.7t exhaust valves because of valve length but that's it. They will bolt right up as long as your exhaust studs are in the correct locations. I picked up a set of 2.8 heads off of a Canadian 2.8 a6 and the exhaust studs where not the same configuration as the 2.7 manifolds. Mine is a rare case just really bad luck of the draw and a learning experience that I did not want to have to learn haha. 2.8 cams will help top end flow with larger than k04 turbos so if you plan on running big turbos use the 2.8 cams.

[Audi9]

Use the search feature

[AudVW]

You need to swap exhaust valves with 2.7t exhaust valves because of valve length but that's it. They will bolt right up as long as your exhaust studs are in the correct locations. I picked up a set of 2.8 heads off of a Canadian 2.8 a6 and the exhaust studs where not the same configuration as the 2.7 manifolds. Mine is a rare case just really bad luck of the draw and a learning experience that I did not want to have to learn haha. 2.8 cams will help top end flow with larger than k04 turbos so if you plan on running big turbos use the 2.8 cams.

What will the cams do to to the bottom end? Will they effect spool up?

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[jaychen]

You need to swap exhaust valves with 2.7t exhaust valves because of valve length but that's it. They will bolt right up as long as your exhaust studs are in the correct locations. I picked up a set of 2.8 heads off of a Canadian 2.8 a6 and the exhaust studs where not the same configuration as the 2.7 manifolds. Mine is a rare case just really bad luck of the draw and a learning experience that I did not want to have to learn haha. 2.8 cams will help top end flow with larger than k04 turbos so if you plan on running big turbos use the 2.8 cams.

valve length? first i have heard that.

its where the keeper is situated on the valve. that is the purpose of swapping the 2.8 exhaust valves out.

Was your canadian 2.8 a6 a 12v? as far as im aware, ALL 30v 2.8's have the same exhaust stud config.

[Corradovolksb]

They won't hinder spool as far as I have seen but will help top end flow due to the larger lobe size causing more valve lift.

[wbrunner23]

B5 RS4 came with K04s and very similar (basically identical) cam profile to the 2.8. If the cams weren't suited to the turbos, Audi/Cosworth wouldn't have matched them. <-- I'm ignoring head design in that assumption - I can't remember exact differences between RS4, 2.7, 2.8 heads.

But from what I've researched, you will shift power curve slightly right and cam potential is exploited more at higher RPMs, thus the bigger turbo argument. A recent thread claimed gains w/ 2.8 cams on K04 framed turbo, iirc, but I couldn't find it.

[christianb5s4]

B5 RS4 came with K04s and very similar (basically identical) cam profile to the 2.8. If the cams weren't suited to the turbos, Audi/Cosworth wouldn't have matched them. <-- I'm ignoring head design in that assumption - I can't remember exact differences between RS4, 2.7, 2.8 heads.

But from what I've researched, you will shift power curve slightly right and cam potential is exploited more at higher RPMs, thus the bigger turbo argument. A recent thread claimed gains w/ 2.8 cams on K04 framed turbo, iirc, but I couldn't find it.

There was also a thread where someone put them on a K03 car and saw some slight gains too.

[V1nny]

I did some searching and results are not conclusive.. Could anyone tell me if 2.8 camshafts could be swapped in, along with chains and tensioners replaced without touching timing belt?

[wbrunner23]

There was also a thread where someone put them on a K03 car and saw some slight gains too.

I couldn't remember if it was K03s or K04s in that thread, but I think we're both referencing the same.

[V1nny]

I couldn't remember if it was K03s or K04s in that thread, but I think we're both referencing the same.

pretty sure 2.8 heads or cams would not do any good to k03 daily driven car, all they will cause is the loss of low end torque.

[AudVW]

That gives me my answer 2.8s it is. Anyone know I good place to get quality exhaust valves for a good price? I am willing to bet mine are hit due to the timing belt breaking

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[V1nny]

That gives me my answer 2.8s it is. Anyone know I good place to get quality exhaust valves for a good price? I am willing to bet mine are hit due to the timing belt breaking

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cheap:
https://www.ecstuning.com/Audi-All_R...cal/ES2801285/
oem:
https://www.ecstuning.com/Audi-All_R...ical/ES277592/

[AudVW]

Holly shit that's a difference

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[V1nny]

Holly shit that's a difference

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only one order of magnitude, at least they are sodium filled, unlike some other aftermarket..
My local shop just quoted me $1450 in labor for 2.8 camshafts, valve stem seals and chains and I am shocked and depressed.

[AudVW]

That's rediculous. I do all the work myself as I work for vw and know how these things work. It's not hard to rebuild heads only thing I wouldn't be able to do is grind valve seats and valves. And at my local shop that cost less than 400

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[MarlinFoundNemo]

That's rediculous. I do all the work myself as I work for vw and know how these things work. It's not hard to rebuild heads only thing I wouldn't be able to do is grind valve seats and valves. And at my local shop that cost less than 400

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You dont have access to a valve grinder? likely not but you can do the valve seats yourself VERY easily. Just buy a kit and you take the thing and spin it in the valve seats until its shiny haha ive done it

[AudVW]

I know how to lap valves to make them match the seat they are going in but I can't do a three angle valve job is what I was saying. I have almost considered getting a valve and seat cutting machine though. It would be a ton of fun and you can find used ones all over Craigslist for around 400

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[AudVW]

I know how to lap valves to make them match the seat they are going in but I can't do a three angle valve job is what I was saying. I have almost considered getting a valve and seat cutting machine though. It would be a ton of fun and you can find used ones all over Craigslist for around 400

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You were talking about lapping valves with valve grinding compound. Despite it's name that's not actually a valve grind. It just tried up the exact point where the valve and seat touch

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[AudVW]

Trues

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[AudVW]

Does a 2001 s4 have secondary air?

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