parts compatability
- Thread starter kblood477
- Start date
Chris
YARRR SUBY MONSTER!!
That's only with stock N/A pistons, I thought.
Anyway, if you're doing a full build get yourself a turbo block.
2point5RS_Dan
HATER DAN
Get a turbo block. Do it right or don't do it at all.
I don't have money for a turbo block or I would . I have a 2.5 already and im not looking for 400 hp. I just want to kno if sti crank will fit in a 2.5 n/a block . the motor I plan to build is going to be quite a mutt. my understanding is open deck is good for 400 hp(not that I cold afford it)not with stock internals of coarse
First off, you can't necessarily think that because a block is closed deck you can just up the boost & go. Your tuning could blow a built closed deck block just as easily as blowing up your stock motor. I know nothing was mentioned of this, but I like to point it out as it's something that a lot of people seem to take for granted.
The difference in closed deck / open deck doesn't have to do with the cylinder heads. It has to do with the deck surface. This is where your cylinder heads mate up to your block.
An open deck block will have more area around the cylinder where the coolant flows (watter jacket). A closed deck block will have less area around the cylinder for the coolant to flow.
The advantages of a closed deck is that the cylinders will be stiffer, therefore more able to withstand higher cylinder pressures. It also keeps the cylinders from moving around as much during high loads. An open deck block would be more likely to have the cylinders move around under those loads, causing rings to lose their seal....bad stuff.
copied from another forum.....
The difference in closed deck / open deck doesn't have to do with the cylinder heads. It has to do with the deck surface. This is where your cylinder heads mate up to your block.
An open deck block will have more area around the cylinder where the coolant flows (watter jacket). A closed deck block will have less area around the cylinder for the coolant to flow.
The advantages of a closed deck is that the cylinders will be stiffer, therefore more able to withstand higher cylinder pressures. It also keeps the cylinders from moving around as much during high loads. An open deck block would be more likely to have the cylinders move around under those loads, causing rings to lose their seal....bad stuff.
copied from another forum.....
Chris
YARRR SUBY MONSTER!!
As long as the block is good, that's all that matters. The stock internals on those suck anyway.
The STi block is partially closed deck.
No offense, but if you can't afford a turbo block, you probably can't afford to do the turbo swap right.
Cutting corners with turbo cars = major fail.
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Chris
YARRR SUBY MONSTER!!
The 2.0 wrx block has a lot thicker cylinder walls because it's only 2.0L. The 2.5 block is semi-closed deck to strengthen the cylinders from moving.
The n/a 2.5 already has head gasket issues. Partly due to the walls being thin and close together. Too much power will make them move and mess things up.
that's the only thing .. okay now whats your in put on this. instead of boring and sleeving a 2.5n/a just sleeve it down to a 96 mm or 92 mm and get 2.2 pistons or 2.0 pistons then have a stroker motor and it would have more area for the head gaskets and more meat in the cylinder walls? . I kno its goofy cause its a lot of work but I already have a 2.5 block just sitting there