rods are expensive

 

Ok I have a minor question, what exactly is the overbore on the Buschur pistons, is it 0.020 or is it 0.20, depending on which thread you read you seem to get a different answer. Also, what would this actually make the bore in metric units?

 

.020 is a common overbore... .20 is a major typo! Only race blocks have that much meat in them to remove. Most engines can't go past .060 over and that's taking chances with cooling issues.

 

So what would that leave my bore at in metric terms? The stock is like 84.5 mm or something right?

 

roughly 85mm

 

Ok I just found the info (I think), stock bore is 81.5 mm and the 0.020 overbore is 82.00 mm, can anyone confirm this?

 

why didn't the shop see that your pistons were "melted" when they took the head off the first time to change the valves?? This shop doesn't seem like they are donig everything exactly how they should.

 

My guess is he took the head off, noticed the 4 bent valves and went from there.

 

Jebus... I just read this thread... and Jebus... Hope it works out for you man? But 4 grand in repairs? Jebus!!!

Fox

 

I should have my car back in around 2 weeks, I gotta order the pistons and those usually take about 10 days to arrive here from the US.

 

.020 inches is about .5mm... as i answered before when you stated 84.5 it would be 85mm at .020 overbore.

Since the stock bore is 81.5 as you posted then 82mm would be the new size.

Why are you asking this though? Your shop should have easily been able to tell you all this. That is if they a descent shop! Or perhaps you just didn't ask them and wanted to know?

 

My mechanic just wanted to know what pistons options were available so he could tell the machine shop what bore to go to. Since its basically stock, or the 0.020 overbore, I don't really have a lot of options. Don't forget mitsubishi hasn't been in Canada long, the two dealerships in my city don't even carry most of the parts needed for a job like this, and most mechanics haven't even touched a lancer yet. A lot of people still think that my car is just an evo without the turbo, its that bad up here. But thanks for the input, at least now I know what 0.020 overbore actually means in metric. If I have a choice, what would people recommend, staying stock bore, or going for the slight increase (take into account I'm going higher compression)?

 

stock bore... for best longevity/safety
.020 over for little bit more power and good reliability
.040 over for little more power... possibility of not being reliable at all.

 

Alrighty 0.020 it is.

 

amby did you get the great deal they're having? 200 for weiseco's pistons from busher