Boricua944

how is it that they get the 2.8 do they just bore out a 2.5. and what is the displacement on stock 951's is it 2.5?

Dave

951=2.5
IIRC, 2.8=2.5 with a 3.0 crank.

Boricua944

so you can get a 951 which is a 2.5 and tha famous 2.8 stroker kit?
but that 2.8 doesn't have bigger pistons just a 3.0 crank?

David Floyd

Or bore and sleeve to 106mm = 2.8

Boricua944

so lest say you bored and sleved a 951 engine to 2.8. you would just have to buy new piston correct? or is there more to this?

Dave

Pretty sure they're custom made pistons.

Boricua944

so what does this famous stroker kit do?

*eurospeed951*

cutom pistons

Robby

The longer stroke helps low end TQ more- although,when done correctly, the 2.8L bore is supposed to help TQ a lot too- generally speaking, the longer stroke helps TQ & larger bore helps high winding HP.... again, GENERALLY....

Mike1982

Yea I have hear of that too about the bigger stroke is GENERALLY TQ and bigger bore is GENERALLY better for higher HP in the upper range. Most of the big V-8's have a bigger stroke then bore which helps them to get that low end TQ but they suffer it with less HP in the upper range. Do a search on this because there was just a thread that was VERY imforative about this issue. They went off on how different car companies do certain things to the motor of get the low end TQ.

Boricua944

So the 2.8 stroker kit gives a bigger bore and longer stoke? So you would need to dissasemble your engine and take the block to get bored over correct?

Matt H

No, a stroker kit indeed, increases stroke. I *believe* you would hit 3.2L by doing both a bore and stroke. If I were you I would call SFR, Anderson, or Huntley. I have no aff with any of them, but they all do a version of what you are looking for.
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Jonas Goldsmith

Why not do a 2.7??? all it is is a late block... how much easier would that be???

Tom M'Guinn

The 2.8 stroker kit uses the 3 liter crank, with special pistons and rods, in a stock 2.5 liter block -- stock bores.

The factory '89 2.7 liter motor uses the old 2.5 liter crank with bigger 3.0 liter bores.

The factory 3 liter motors use the bigger bores and bigger crank.

Dave

BTW, I don't know of anyplace to get a "kit," usually one would just but the all the peices (crank, rods, custom pistons, rings, bearings, etc).
Unlike a chevy small block, you can't just bore the cylinders to a new size. There is 1 overbore AFAIK and pistons are hard to find (and $$$). Boring the Alusil block is only the first step, the second step is etching the cylinders so that a small amount of aluminum is removed but the silicon crystals are left behind, finally the cylinder is honed to bring the silicon to the proper dimension, leaving a cylinder wall that is mostly silicon. A lot of machine shops won't touch it.
This will only give you a few CCs (0.5mm larger postons), to do a 2.7 or 2.8 is a different process. The cylinder walls are not thick enough to bore for a 104 or 106mm piston so sleeves must be installed, IIRC the entire cylinder is basically machined out and replaced. Add the cost of the machine work to the custom pistons and 3l crank and you can expect to drop some serious cash.