1) Anyone know what sort of valve lifters are used in the us EVO?
Hydraulics or solid?

2) Is the clutch self-adjusting?

3) CAR magazine claims that they are going through clutches at a very high rate in their uk spec EVO VII. What is the reliability of mitsu clutches?

4) Anyone know of a good Mitsu service department with good techs in the DC/NoVA/MD area? I've been buying BMWs simply because I've had very bad experience with the service departments of more common cars (honda, subaru, vw, and even audi).

5) I know the turbo is oil cooled according to mothership, but I am
assuming there is also a water jacket? I base this on the fact that I haven't seen a pure oil cooled turbo in years. The reason the subaru WRX does not need a cooldown period is due to the design of the coolant system plumbing, which keeps a reservoir of coolant above the turbo and as the hot turbo boils away the coolant, more coolant drips down.

6) What is the service interval on the engine

7) Is the engine closed deck or open?

8) How reliable is the rear mechanical diff? Is it a clutch pack type
diff which in other applications is known to start failing around 25k-35k miles

 

Good questions. I was wondering about the new clutch as well.

 

I think the US Evo read LSD is viscous for less wear. A clutch type wouldn't fail sooner, but it will definately wear out sooner and then you'll need to replace the discs.

Mark

 

since the turbo is oil and water cooled will a cool down period or turbo timer needed on the EVO???

 

so the clutch is improved over the 7??

 

Claud...

Not to question your judgement, but are you sure about the deck being open? The 4G63 in my Talon is closed. Why has Mitsu changed it? That was one if the things I disliked most about the US WRX, open deck. That would seem to be a weak point in design to me.

 

Longfury, a turbo timer is always a good investment.

 

Some of the heat in the bearings will be not covered by the water jacket, especially if the system does not have a coolant pump that continues to run after engine shutdown. I always give turbo cars about 2 minutes to cool down. Spend the time getting your interior in order, picking up the phone, etc.

/v

 

I assume it is because closed decks are more expensive.

/v

 

I agree that it costs less money to produce, but that also a huge step backward. Honda engines have an open deck and they require a block reinforcement (for lack of knowledge of the real term) when they start to produce real horsepower. I've never seen this sort of thing for a Mitsu engine.

 

So, about the clutch on the Evo 8. Is it improved???

 

what are closed and open deck engines?

 

I don't have any pictures to help in this explaination, but here goes.

Picture the block of the engine being a solid rectangular hunk of iron. Now, bore four cylinders in that hunk of iron that the pistons ride in and you have a closed deck.

Now, for an open deck, envision a rectangular 'outline' of iron with cylinder sleeves that the pistions ride in and are attached to the 'outline' of iron rather than bored into it.

A closed deck is much more solid and obviously, offers more tuning capabilities without upgrading the deck or adding to it. I'll search for some pics that I can possibly link to.

 

ohh ok i know what you mean now, i've just heard it called sleeved and unsleeved engines before, but there are a lot of high performance engines that are sleeved, it makes it alot easier to rebild the engine, i think most motorcycle engines are sleeved but i might be wrong.