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Misses when cold, goes away when warm...

 
Old 11-06-2015, 03:11 PM
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Just ordered all parts except for the valve seats...

Now....where's my torque wrench?
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Old 11-06-2015, 04:06 PM
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Sorry I only skimmed the thread, but curious, are the valve seats damaged to the point they can't be reground?

Reason I say this is the stock seats are very tough, I'd keep them if they can be reground back to good condition.
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Old 11-06-2015, 04:32 PM
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Originally Posted by patsmx5 View Post
Sorry I only skimmed the thread, but curious, are the valve seats damaged to the point they can't be reground?

Reason I say this is the stock seats are very tough, I'd keep them if they can be reground back to good condition.
You are absolutely correct.

The thing is, I live in Istanbul, Turkey.
Getting parts over here is an ordeal.
Considering he fact that valve seats are fairly inexpensive, I thought it would be cheap insurance to have them at hand if the damage is extensive.

They have only been handled once. By "handled" Imean I really do not know if the butcher machinist ground or cut them.

I'll see once I have the head off and taken apart.
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Old 11-06-2015, 04:37 PM
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Ah, gotcha. Good news is 98% of shops grind the seats. I bet they can be reground.

Good luck moving forward. Have you found a better machine shop to do the work? I feel your pain, I have had shotty machine work done before too and paid a premium for it. I now rebuild cylinder heads myself which costed a lot to buy the tooling to do.
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Old 07-13-2018, 08:56 AM
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And the saga continues...

I have been running the car with all new valves, seats, guides and new light double springs since my last rebuild.
Here is the funny part: Now, valve clearances are GROWING.
I checked the lash, and especially exhaust valves have too much, up to 0.42 mm.

What's interesting is, I am hearing the valves tick at low speed decel only.

Head will come off one more time.
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Old 07-13-2018, 09:23 AM
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One question I got to ask... with all these valve issues lately why does everyone seem to continue to insist on supertech valves?
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Old 07-13-2018, 09:27 AM
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Originally Posted by Stealth97 View Post
One question I got to ask... with all these valve issues lately why does everyone seem to continue to insist on supertech valves?
It was pretty much established that these valve related problems were caused by incorrect machining practices.
There are quite a few people here who race and otherwise abuse Supertechs with no problems.
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