Evo 9 problems
#76
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#77
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#78
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Did you add a capful of oil and redo compression test to see if the 2 low cylinder numbers went up?
I just wanted to update my thread. One major issue was the valve seals are roached. Drops of oil was found on top of two piston heads. The compression test did come out good across all 4 cylinder with a 15 difference between two cylinders. I'm going to go ahead and get the turbo sent of as well to get inspected.
So the head will have to be removed and sent to the machine shop. I'm looking at 8 to 10 hours of labor and about $890 for machine shop work on the head. Than all the new Misc parts such as water pump, gaskets, spark plugs, arp head studs, etc.
Since the head is coming off I thought about upgrading the cams as an option since this would be the best time to do it. what would be good cams to upgrade for a stock motor? i'm thinking about the HKS cams.
Would the bad valve seals cause my AFR to act all weird as well and lean out at idle?
But I just wanted to update this thread for the future when someone has the same issues as I did.
So the head will have to be removed and sent to the machine shop. I'm looking at 8 to 10 hours of labor and about $890 for machine shop work on the head. Than all the new Misc parts such as water pump, gaskets, spark plugs, arp head studs, etc.
Since the head is coming off I thought about upgrading the cams as an option since this would be the best time to do it. what would be good cams to upgrade for a stock motor? i'm thinking about the HKS cams.
Would the bad valve seals cause my AFR to act all weird as well and lean out at idle?
But I just wanted to update this thread for the future when someone has the same issues as I did.
#79
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#80
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Props and shout out to familymr for doing the work on my Evo. FamilyMr updated me with pics of the Burnt valves and top of every piston. He said the problem was dual valve springs on stock guide.
Last edited by KYjerry414; Jul 26, 2017 at 07:29 PM.
#82
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Guys the car has a old school set of dual valve springs with stock valves. The valve guides are worn with a lot of play . Enough to rock the valve and hurt the top of the stem. The car will be going back with a set of gsc bronze guides and gsc beehive springs and new s1 cams. Oh an 6 exhaust and 4 intake guide seals was moving freely
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KYjerry414 (Jul 26, 2017)
#84
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Why not S2 cams at this point?
Guys the car has a old school set of dual valve springs with stock valves. The valve guides are worn with a lot of play . Enough to rock the valve and hurt the top of the stem. The car will be going back with a set of gsc bronze guides and gsc beehive springs and new s1 cams. Oh an 6 exhaust and 4 intake guide seals was moving freely
#87
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#90
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He said bronze seals really well, but will need occasional replacing. I wasn't looking to pull the head again, during the lifetime of this car.