Lets talk heads, no, not that kind! Options

[cgnj]

Headflow Masters head. 44x438. Guess Adrian expects the seats to stay where he put them.

Carlos

[DuckRyder]

That head has to be the scariest thing I have seen in years!!! All those peen matks are pre detonation waiting to happen!

Those are a BIG mistake..

Who did those,

I'd be scared that they would end up looking like this:

(IMG:http://www.bellsouthpwp.net/d/u/duckryder/914/Chamber2.jpg)

(IMG:http://www.bellsouthpwp.net/d/u/duckryder/914/Chamber3.jpg)

[Jake Raby]

Headflow KNOWS HIS STUFF. Adrian has done 85% of my valve seat work in the last 5 years.......There is NO BETTER TIV head tech in the world, than Adrian....I have pretty much tried them all with my own demands for cylinder heads.

[Korijo]

Everyone is soo SCARED of my heads. (IMG:style_emoticons/default/stfu.gif)

Jerry is a reputable machinist. Ask anyone here in the NW.

I don't wanna send my $$$ to another state,
when I could help out a local VW/Porsche business.

I trust him. Many others do to !! (IMG:style_emoticons/default/finger.gif)

[DuckRyder]

Headflow KNOWS HIS STUFF. Adrian has done 85% of my valve seat work in the last 5 years.......There is NO BETTER TIV head tech in the world, than Adrian....I have pretty much tried them all with my own demands for cylinder heads.

If only he would return calls or answer his phone.

(It has been a while, but I gave up on the guy)

[ChrisReale]

I agree with Dave, Jerry has been doing this stuff since we all were still in our mothers womb(that includes you 40 somethings!). If ya dont like it, dont have him do your heads. Probably 90% of the Porsche?VW's around here that have had rebuilt engines Jerry has prolly done the heads.

[Dave_Darling]

True, Chris. But those photographs have removed Jerry from my "short list" of people I would send my own cylinder heads to.

--DD

[Korijo]

But those photographs have removed Jerry from my "short list" of people I would send my own cylinder heads to.

Why ?? Its a picture... Seeing them, touching them; you MAY get an idea of HIS way. There is no ONE way to do a task.
Maybe, in his many years of experience, he learned a new way to "better" the 2L seat drop issue (IMG:style_emoticons/default/idea.gif)

I'm happy w/ how they turned out. And thats what matters...

Just my "nickel bag o' funk" ($.02)

[ChrisReale]

True, Chris. But those photographs have removed Jerry from my "short list" of people I would send my own cylinder heads to.

--DD

Then dont.

Dave, were those 2 liter heads of your 1.7's?

[Bleyseng]

Jerry didn't "stake" my valve seats in when he did em 3-4 years ago. I should swing by and talk to him about what and why he is doing that now. He did do a nice job of porting the heads as they make nice power.

Chris, I think those are the 1.8 heads not the 2.0L ones.

Geoff

[DuckRyder]

(IMG:style_emoticons/default/ohmy.gif)

Damb, yous guys are awful touchy about it.............

Perhaps the stakes are not as severe they appear in the photo. The rest of the heads look nice (if one can judge that sort of thing by looks)

I would be concerned that the stakes would create hot spots and cause pre-ignition problems particularly if the compression is raised.

Nothing wrong with a little discussion about it.

Certainly there is more that one way to do things, but I don't see the need to throw the bird and "F" word around.

The guy who did the head in my photo, does probably 85% of ALL the heads that are redone around here, but that sure doesn’t mean he didn't screw that one up. By the way, there were indications that that little spot on mine was pre-igniting, and they don't have more than 500 miles on them.

I'm not trying to rain on anyone’s parade, but if Brad and Jake are worried about it, that would be enough to get me to make a phone call or two. Someone else says their heads by the same guy were not staked like that (or at least didn't appear to be) it may very well be that the stakes were supposed to be polished out or heli-arced over and they some how got shipped without it having been done?

[Jake Raby]

Any pit like that in a chamber must be polished, else it will cause detonation much earlier than if it were polished away.........

[Charles Deutsch]

Jake,

Would the end of a Heli-Coil insert protruding into the combustion chamber (stock 2.0) cause preignition problems? (Glad you're here, btw.)

[Korijo]

Chris, I think those are the 1.8 heads not the 2.0L ones.

Nope. 2L heads.

Any pit like that in a chamber must be polished, else it will cause detonation much earlier than if it were polished away.........

The pitting is not very deep. Its MORE pronouced in the photo. Looks worse on the monitor.

Now, I'm getting worried (IMG:style_emoticons/default/unsure.gif)

[ChrisFoley]

Would the end of a Heli-Coil insert protruding into the combustion chamber (stock 2.0) cause preignition problems?

Why would the end of a heli-coil prodrude into the combustion chamber? I assume you are talking about a spark plug hole repair. If it was done properly it wouldn't stick out at all.

[914werke]

So Jake, on the topic of spark plugs and Type4 heads, its been suggested that you advocate the Weld up of the existing spark plug hole to re-tap for the smaller Motorcycle type plugs (10-12mm).
Is that correct ?
Seems logical to avoid the cracking weve all seen but is there any downside?
IF you go to bigger Valve sizes do then creep back into that territory?