Evo X upgrades

[Shane@DBPerformance]

It happened while taking off/putting on that double cam cap, while working on setting up his valve clearances. The Evo X doesn't have hydraulic lifters, it uses non-adjustable valve tappets that need to checked/measured/bought/etc that go between the cam and valve. I had 3 that weren't within the specs with his new cams in there.

There is a bearing on the cam cap where it broke. Only 1 cam journal in the head uses a bearing and it was the one that broke. I am sure not if a dowel wasn't seated correctly or the bearing was a little out of alignment/high/rotated and it caught an edge. It took very little force for it to break. I didn't realize it was such a potential risk for breakage until after I did it and found other people on EvoM who had done it also and heard from Brookdale Mitsu that they have had other customers in town do it also. Since there is a bearing in the one that did break, I have a solution for fixing it, that I would do if it was my car, but it's a customer car and I didn't want to do that on his head or fix in that without telling him. The look of the casting and thickness of cap in that area doesn't scream strong, it looks like something you could tap on the ground and expect it to snap off.

[Murlo26]

Well I guess more research for when you pull my head;)

You didn't have to deal with this when doing my cams did you? I am guessing because you didn't have to pull my head...i am no mechanic.

[Swifty1638]

Toyota uses this type of design on some of those heads too, but they are more robust and better designed then these are.

[Shane@DBPerformance]

I had that piece off your head to do the cams, but I didn't have to mess around with yours as much taking things on and off, because all of your valve clearances seemed to be within spec. All of his clearances that were out of spec were on the exhaust cam, 2 were barely out of spec and 1 was a bit farther out. You won't have any rockers popping off or lifters collapsing with these heads, but dealing with shim buckets is sometimes a pain and can get expensive. I have done Subaru and Supra heads with BC cams that required every shim bucket to either be moved from another valve or replacement ones bought. Buying the cheaper cams ends up costing more than just buying some HKS cams that are ground right in the first place, but a lot of guys will also just drop whatever in without ever measuring anything.

Well I guess more research for when you pull my head;)

You didn't have to deal with this when doing my cams did you? I am guessing because you didn't have to pull my head...i am no mechanic.

[Swifty1638]

I HATE doing the shims on those buckets!! Luckily the dealerships paid us a few hours book time to do them!

[Matt D.]

Regardless, your car is in good hands. This is why DB rocks and Shane is the man.

Thanks for the info, Shane.

[mlomker]

Regardless, your car is in good hands. This is why DB rocks and Shane is the man.

One of the best decisions I've made but I'm afraid that Shane might up scheide's fees for sending him expensive customers. :wedgie:

[Matt D.]

One of the best decisions I've made but I'm afraid that Shane might up scheide's fees for sending him expensive customers. :wedgie:
Just pick up Taco Bell for Shane, order everything with extra no meat, and he'll be happy.

[scheides]

One of the best decisions I've made but I'm afraid that Shane might up scheide's fees for sending him expensive customers. :wedgie:

I don't mind paying extra when I'm at DB. It's one of those places that I want to know is going to be there for years and years to come, and didn't close down because I skimped and begged to save a few bucks just to see them close their doors after a few years.

That's freaking crazy that there's a bearing on one of the cam caps...what on earth is the reason for this one random bearing? What a PITA. That thing does look thin as hell too, no wonder it broke. :(

[Kracka]

http://forums.evolutionm.net/sale-wanting-buy-wtb-trade-wtt/479097-wtb-scrap-evo-x-head.html#post8128065