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16V euro heads....before-after pics

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Old 06-26-2013, 05:02 PM   #1
IcemanG17
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Default 16V euro heads....before-after pics

So after Sean's unforunate engine failure from extreme overheating we took it apart......the heads didn't look so good with lots of rust corrosion, and light pitting in some areas

I took them to a machine shop recommended by an excellent local 928 mechanic.... Valley Balancing in Ceres CA.....they found 4 exhaust valves were bent from the overheating & the usual replacement parts....

Picked them up today...STUNNING....take a look
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Old 06-26-2013, 05:05 PM   #2
Mike B
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Wow...those look like new! I'm guessing they milled a little off the mounting surface?
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Old 06-26-2013, 05:07 PM   #3
Ducman82
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nothing like the look of fresh 16v heads!
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Old 06-26-2013, 05:46 PM   #4
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What brand are the new valves? I'm asking bc I'm curious about the loss of the recess in the top of the valve.
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Old 06-26-2013, 05:47 PM   #5
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Oh my those look great !!
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Old 06-26-2013, 05:52 PM   #6
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Wow - nicely done.
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Old 06-26-2013, 06:13 PM   #7
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all of the valves are 100% stock.....4 exhaust valves came from 928intl and the others were stock 84 euro.....it is quite nice...it appears the "bent" valves were 1-4 and 5-8...interesting that the outside exhaust valves would be the hottest?
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Old 06-27-2013, 02:23 AM   #8
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Makes me think what a waste it was spending hours with a razor blade trying to remove all the old gasket etc. on my set. Lots of work and they still look a lot more before than after.
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Old 06-27-2013, 02:31 AM   #9
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Looks like the sodium cooled exhaust valves
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Old 06-27-2013, 07:44 AM   #10
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Any idea of the final CR with the shaved heads?
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Old 06-27-2013, 03:06 PM   #11
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Quote:
Originally Posted by 85euro928 View Post
Any idea of the final CR with the shaved heads?
it was a very light shave.....only one thousandth..... With a standard headgasket and the piston cuts it should be right at 11-1.....for the 5.0L euro....this engine will be ran by a full stand alone system VEMS tuned by Colin.... I am optimistic it will be 340whp-torque
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Old 06-27-2013, 05:04 PM   #12
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Quote:
Originally Posted by IcemanG17 View Post
it was a very light shave.....only one thousandth..... With a standard headgasket and the piston cuts it should be right at 11-1.....for the 5.0L euro....this engine will be ran by a full stand alone system VEMS tuned by Colin.... I am optimistic it will be 340whp-torque
Better mix in some ethanol for that compression ratio. 91 won't cut it with high race track temps. I know you can tune for retard on knock - I am saying try to not knock at all.
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Old 06-27-2013, 05:33 PM   #13
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Sounds very optimistic, is this with stock Euro S parts except for the slight shave on the heads?

Normal for 5.0L Euro is about 290 rwhp isn't it with a good exhaust etc. Given the stock brain can tune AFR and timing to pretty much whatever you want, why the assumption a different brain will result in any gain whatsoever? Its not going to change the air flow through the motor.
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Old 06-27-2013, 06:51 PM   #14
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Quote:
Originally Posted by danglerb View Post
Sounds very optimistic, is this with stock Euro S parts except for the slight shave on the heads?

Normal for 5.0L Euro is about 290 rwhp isn't it with a good exhaust etc. Given the stock brain can tune AFR and timing to pretty much whatever you want, why the assumption a different brain will result in any gain whatsoever? Its not going to change the air flow through the motor.
The assumption that there is no gain going from an older OEM ecu to a new aftermarket ECU is a fallacy and a false premise. The false premise is that Porsche did everything in their power to eek out as much HP as possible.

This is completely untrue.

Proper timing and proper fueling represent night and day differences on stock engines.
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Old 06-27-2013, 09:11 PM   #15
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I don't think they'd get that pretty with just 0.001" off. And pretty they are.

Controlling knocking is critical on these engines. 91 octane is the best you can get?
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