New cylinder head

[Smokey Eddy]

Hydraulic. Isn't the aaz hydraulic?

[saurkraut]

Yup

[rallydiesel]

What's so great about the OEM heads? They can't hold more than 30 psi and the pre-cups have come loose on a few.  

[Smokey Eddy]

I wouldnt use a chinese head without studs fusing it to the block.
I'm hoping a metal HG & arp studs will hold it down

[belchfire]

I got the 1.6 hydraulic head from prothe

[jtanguay]

it all depends on your budget IMO.  unless you know 100% that your head is of superior quality, why pay more?  i'd love to buy a prothe head and just beat the crap out of it and see what happens  :lol:

under stock conditions it should behave as intended, but i am doubtful that it could survive the thrashing that some of the stock heads are subjected to.

and the price is right  :wink:

[belchfire]

I am going to post this reply on my other topic "destroy all lifters" as well.  libbybapa was right.  After checking that the IP wasn't 180 deg out I pulled the head. I could see where bad IP timing would cause it to run poorly but it has nothing to do with compression. Both heads appear identical so I installed an injector and glow plug in the old one and CC'd the pre-chambers. Original german head = 11cc. New head = 13.5cc. Hammered out the inserts. Maybe not the best idea, but I was pissed.
 The new insert is about .020" larger in dia. and .007 longer than OEM.
I cc'd them both and amazingly, they were 3cc's each. I then cc'd the spherical chamber up to the edge of the insert boss and that's where the difference was.
  How to fix this: I could calculate the volume of the head gasket and get a thinner one. Problem is that I'm already using a 1 notch gasket.
(B) Can't mill the head as the valves are flat on the surface and the chamber's opening would be altered.
(C)  Mill the block (also known as a complete tear down) to raise the piston height, however, the amount milled might make the pistons hit the head/valves.
   So my real choices are to (A) spend another $500 on a non Chinese head after dumping a grand and a month's worth of work on it or (B)-
Sell the whole thing as-is and get something else non VW.
    :cry:  :cry:  :cry:

[Vincent Waldon]

Yeah... that really sucks.

Sounds like something the vendor might want to take some responsibility for ?

[Duster 5.9]

wow that sucks, i'm soooooooooo glad i belong to this forum, and if i really get in trouble i can go pay duane a visit :twisted:  besides i just gotta see his blkboostedtruck any how.

[belchfire]

I had thought about welding & machining. I have been welding for 40 years and machining for 15. I could do it except that I've lost my machining privileges when I changed jobs. Even if I could, I would have to come up with a spherical cutter to duplicate the original profile and then have to determine some way to calculate the exact volume and be consistent with it across all chambers. This would be way more than it's worth and would be  $1000 worth of machining. Looks like it's scrap.

[burn_your_money]

Maybe I'm way out to lunch, but according to this thread
http://www.vwdiesel.net/phpBB/viewtopic.php?t=12633

it should still work. People run the 1.9 head on the 1.6 and the CC is a lot bigger on the 1.9 head. I don't think your compression should be that low

[clbanman]

If my math is correct, the additional volume would drop your compression to 81% of what you would have with the proper size combustion chamber.  So if ideally you were looking at 450 lbs, you would drop to 366 lbs.

[zukgod1]

366 would/ should be plenty. Mine was running with WAY less compression.

[zukgod1]

I also have larger precups in my head and was running a 3 notch HG when it speced out for a 1 notcher.
I just don't see the extra cc being a problem.

[Mark(The Miser)UK]

I did the math and came up with higher numbers than that even.  Actual displacement of the 1.6 is 1.588L.  or 1588cc.  1588 / 23 = 17.26 giving the entire volume of the stock combustion chamber.  Using Boyle's Law (P1*V1=P2*V2) and a P1 of 450 psi, given the stock chamber size of 17.26 and the chinese chamber size of 17.26 + 2.5 this is what I come up with:  

P1*(17.26 + 2.5) = 450*17.26

P1 * 19.76 = 7767

P1 = 393

Soooo, if a stock combustion chamber pressure was 450 psi, then with the added 2.5 cc of volume in the Chinese head, that pressure would drop to 393 psi.  

Obviously there is some other issue at work as well.  What compression gauge was used?  What method?

Andrew

I can't quite get to grip with those figures Andrew. Where is the /4 bit ie 397cc and although this is the swept volume you started off with 397 + combustion chamber, and reduced it to combustion chamber.  The fluid measurements  for the PC should be big hole less dipped/ emersed in a measuring jug vol of insert [was that what was measured or the insert's carrying volume?]  Am I right? My eyes are tired and I'm lacking focus here :oops: