Biography of an EA82T Cylinder Head

nncoolg · #1 Wed 6th January 2010, 07:19 PM

After looking into the Vortex Hi-Rise intake (would love to cut one of those up too) I Decided to cut a set of Gen2 heads 'in half' to get a clue as to where the weak parts were and where they can be improved, port flow wise...here are the photos:

They really do have quite extensive cooling around the IN ports, if only the EXH/IN ports were seperated like these:
(This photo also shows the area behind where the 'triangle' shaped water jacket in the block meets the head, they can be drilled here and allow coolant flow directly into the head)

Really not much cooling down the bottom end of these heads at all, water jackets don't extend past the siamese exhaust merge:

This one shows the bulge where the 'D' section meets the 'O' section:

nncoolg · #2 Wed 6th January 2010, 07:19 PM

cont...

Again... Outlet bulges:

IMO the intake ports are quite good (also above), exception of course is the castings for HLA buckets protruding inside

I like this cut - it shows the very awkwardly shaped EXH port, the very long valve guide, and the amount of meat that is cast around the HLA buckets:

You can see how undercut the seat is in places, also shows bridge crack:

These ones also show the shape of the EXH port and quite a bit of material that could be cut out around the guide, which in my opinion could also be shortened:

nncoolg · #3 Wed 6th January 2010, 07:30 PM

I suppose I should show you the finished port job after I welded the heads back together...

Just Kidding

,done to a different set of heads:

Gannon · #4 Wed 6th January 2010, 08:18 PM

A W E S O M E ! ! !

have you got more pics of the area under the valve bridge crack?

What was wring with the heads?

nncoolg · #5 Wed 6th January 2010, 08:33 PM

Yeah, Im going to take somemore pics when camera is charged and I can get some sun inside the ports.

What was wrong with them : They had Bridge cracks.

Gannon · #6 Wed 6th January 2010, 08:42 PM

Was it just cracks, or were they leaking?

AlpineRaven · #7 Wed 6th January 2010, 08:42 PM

Interesting..... were these heads no good or you just decided to cut them up?
Cheers
AP

steptoe · #8 Wed 6th January 2010, 09:32 PM

They is no good now, other than well documented presentation. I have a set to go on my engine soon, got them checked out by head shop . They say they are OK, even though they have the exhaust port leaking into combustion chamber - crack between both valves. I sorta don't like relying on this condition too much myself, so it is all experimentation.

Nice pics and thanks fer goin to the effort to share Neville

twilightprotege · #9 Thu 7th January 2010, 08:06 PM

great pics! thanks for the effort...

i look forward to knowing more about the head problems. both sets of heads i've had have had a coolant leak coming out of the driver side, from the top front head stud coming out of the small bolt hole that goes in to it from the top (almost below the thermostat if you're looking at it on a complete engine.

discopotato03 · #10 Wed 20th January 2010, 04:39 PM

I gave my engine builder a pair of cooked EA82T heads to cut up before he ported mine . I asked several times if he'd cut them up and he hadn't - I don't know why . If he had I'm sure he could have done a bit more on those HLA bosses .

Those "outlet bulges" were mostly removed on mine to improve exhaust flow .

Cheers A .

Sweating on that computer Neville , cheers A .