Valve seats

[20V18Tnut]

My big port head from Ian arrived last night. 
I am planning on possibly taking it apart and rebuilding it myself unless there would be some machinning needed where it would go to a machine shop.
So I was reading the disassembly and assembly procedures in the Bentley manual and I have noticed that Bentley shows that from the factory 1.8T heads come with the correct three angle job, yes, 30 degree followed with 45 degree seat and then with 60 degree, just like the doctor ordered.
This was kinda shocking because back a few months back when I hade my motor rebuilt, I got a call from the shop owner (which was strange because he would never call me unless I leave like 20 angry messages  ) and he asked me if I'd like them to do the three angle job on my cyl. head for only $300 something bucks extra stating that this would worth an extra few horse power. I consulted a few of my trusted friends and said OK. So I got angry with the slick shop owner after I was reading Bentley last night, but then I thought, well, most of the machine shops do a regular one angle job for most cars and they would probably do it for 1.8T head if a customer dont want to spend some extra $$.

For some of you this little discovery of mine is not merely a news but I just want to state that the further I learn about 1.8T motor, the more I realize how good and performance oriented this little motor is built.

[Dizzy]

I actually thought about posting that picture from the Bentley in a thread about headwork/preparation.   Boo to your head guy.  lol

[20V18Tnut]

It is never too late.

[bobqzzi]

Actually, the Bentley shows you how to do a "repair" valve job.  In actuality, 1.8Ts do only have a single angle.

In fact, with a stock intake valve, it is virtually impossible to get a bottom cut so you end up with a 2 angle job  (45/30). Doing a 3 angle job would involve using a too narrow 45. A slightly larger valve will allow a 3 angle job, but, obviously, requires a special order valve.

The exhaust has enpugh room for a bottom cut.

1.8Ts also have some other interesting aspects to the valve area- non concentric seats and large core shift being a couple.

[20V18Tnut]

Actually, the Bentley shows you how to do a "repair" valve job.  In actuality, 1.8Ts do only have a single angle.

Well, this is a good and a bad news at the same time. The good news is that I can still somewhat trust the shop owner. But the bad news is that if one wants to have the three angle job on 1.8T head, he would have to pay the extra charge.

In fact, with a stock intake valve, it is virtually impossible to get a bottom cut so you end up with a 2 angle job  (45/30). Doing a 3 angle job would involve using a too narrow 45. A slightly larger valve will allow a 3 angle job, but, obviously, requires a special order valve.

The exhaust has enough room for a bottom cut.

1.8Ts also have some other interesting aspects to the valve area- non concentric seats and large core shift being a couple.

Bob, I believe both of these aspect are determined by the exhaust and intake ports being non-perpendicularly oriented with respect to the valves' position.
I have to admit, by reading Bob's forum I've learned more than I've learned by reading ID=27 for the entire year. 

[Don®]

Actually, the Bentley shows you how to do a "repair" valve job.  In actuality, 1.8Ts do only have a single angle.

In fact, with a stock intake valve, it is virtually impossible to get a bottom cut so you end up with a 2 angle job  (45/30). Doing a 3 angle job would involve using a too narrow 45. A slightly larger valve will allow a 3 angle job, but, obviously, requires a special order valve.

The exhaust has enpugh room for a bottom cut.

1.8Ts also have some other interesting aspects to the valve area- non concentric seats and large core shift being a couple.

This is true...there was enough only for a 2-angle job when I did on the AEB head & valves.

[20V18Tnut]

My AEB head showed up today in a mail. Bent stud and rust on camshaft - courtesy of USPS.