Correct part number.

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01 Nov 2012 09:10 #12231 by kennetheryan
I have a 928 that has some bent valves due to a timing belt failure.

I need to know what valve head number goes with camshaft valve head 928 105 251 00.

I am buying a used set and can get either a 346 1R or 356 1R for the valve heads.

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01 Nov 2012 11:28 #12233 by Kiln_Red
Replied by Kiln_Red on topic Correct part number.
The part # you supplied is for a 16 valve model. We need to know what model year and where the origin of sale was for your car. Knowing the engine displacement and whether it is US or ROW will tell us whether your valves were possibly bent or not and, also, what heads and valves you will need.

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01 Nov 2012 16:36 #12241 by pcar928fan
Replied by pcar928fan on topic Correct part number.
It would be unusual for a 16V car to bend any valves if the TB broke... Normally they are free to turn and all one would need to do is time the car correctly and put on a new belt. A rebuild of a 928 engine is EXTREMELY costly. I have seen '85 32V and S4 engines cost in excess of $12,000 to rebuild!

James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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02 Nov 2012 00:07 #12248 by xstepson
Replied by xstepson on topic Correct part number.
If you are familiar with PET, it is located in the OC Technical library forum, links to external areas of interest, and the second item under that heading.

Just change the model from 356 to 928, put in the correct year model, and hit "display".

You should find everything you need in the main engine group area 1.

Good Luck

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03 Nov 2012 11:08 #12263 by kennetheryan
Replied by kennetheryan on topic Correct part number.
I believe it has a Euro 83-84 engine. I understand that to be an interferance engine that would bend the valves.
The camshaft numbers are actually 928 105 251 1R on my engine. I am buying two valve heads from a US 83-84 engine with camshaft number 928 105 251 00. The person I am buying the valve heads from doesn't know if 346 1R or 356 1R goes with the 928 105 251 00 camshaft head. He has two sets of complete valve heads from two different cars.
I am going to use an 83-84 US engine set of valves that are smaller but will work. (I will have a loss of some performance but I am told this should work.)

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03 Nov 2012 14:34 #12266 by Kiln_Red
Replied by Kiln_Red on topic Correct part number.

I believe it has a Euro 83-84 engine. I understand that to be an interferance engine that would bend the valves.
The camshaft numbers are actually 928 105 251 1R on my engine. I am buying two valve heads from a US 83-84 engine with camshaft number 928 105 251 00. The person I am buying the valve heads from doesn't know if 346 1R or 356 1R goes with the 928 105 251 00 camshaft head. He has two sets of complete valve heads from two different cars.
I am going to use an 83-84 US engine set of valves that are smaller but will work. (I will have a loss of some performance but I am told this should work.)


Seeing as your car is a Euro, it is very likely that bent valves is the correct diagnosis.

I think you would absolutely regret swapping to US heads. The drop off in performance would be very noticeable. Not only that, but it just isn't very practical. You could get a complete US engine with the L jet brain, correct intake & injectors, and wiring harness for cheap. Much cheaper than I bet it would cost to convert your engine to US spec. I would call 928 International and get a quote for the correct heads.

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05 Nov 2012 11:46 #12308 by xstepson
Replied by xstepson on topic Correct part number.

I believe it has a Euro 83-84 engine. I understand that to be an interferance engine that would bend the valves.
The camshaft numbers are actually 928 105 251 1R on my engine. I am buying two valve heads from a US 83-84 engine with camshaft number 928 105 251 00. The person I am buying the valve heads from doesn't know if 346 1R or 356 1R goes with the 928 105 251 00 camshaft head. He has two sets of complete valve heads from two different cars.
I am going to use an 83-84 US engine set of valves that are smaller but will work. (I will have a loss of some performance but I am told this should work.)


Euro '83 engine is different than Euro '84. Euro '83 uses L-jet technology and the infamous green wire. Euro '84-'86 uses twin distributors and LH techology complete with CPS and MAF. That being said, some Euro '84 engines have proven to be non-interference apparently due to Porsche's use of overstocked '83 internal engine parts in the '84 engines. I installed the harmonic balancer backwards in one of my '84 Euros and tried to start it. I would have thought that valves would be bent, but they were not. :)

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09 Nov 2012 11:06 #12456 by ROG100
Replied by ROG100 on topic Correct part number.
It would be far cheaper and better to replace the bent valves.
New the inlet valve 928 105 409 02 are $15 each
New exhaust valves 928 105 417 03 are $32 each.
Remember if you buy new from 928sRus you get a 5% OC discount 8>)

Call Mark or Tom at 928 International as they will have used ones for cheaper $ I am sure.

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