1872cc Stroker Crankshaft
- Thread starter Gtturbo
- Start date
ng_randolph
Bjorn H
You don't add the combustion chamber, what you are interested in is displacement, not cylinder volume.
yugoracing
True Classic
1747ccm
fiatfactory
Steve Cecchele
kmarcm,
At 88.5mm the bore would be getting pretty thin in the walls... I've seen these engines out to 88mm, but this requires a special head gasket (at least) as the standard gaskets max out at 87.2ish inside the fire ring.
and as for stock rods... your piston will be running out of room for the ring pack.
63.9mm stroke (1500), uses a conrod that's 128.5mm long, and to get the piston to zero deck is approx 35.0mm compression height (+-0.1mm) ... take away half the diameter of the gudgeon pin (11mm), and the remaining 24.0mm is what you have left to squeeze three rings and ring lands into.
If you stroke the engine by 9.6mm to 73.4mm, your going to push the piston 4.8mm further up the block, thus requiring a piston with just 19.2mm to squeeze the ring pack into, minimum you would need is very skinny rings, I doubt the stock ones would fit in this space (reliably)
have a quick read of this...
http://www.turbo124.com/forum/viewtopic.php?f=10&t=7402
personally I think the 1600cc option hits the sweet spot in terms of rod ratio and bore/stroke ratio
Keule, Whats the 73.4mm stroke crank from???
SteveC
At 88.5mm the bore would be getting pretty thin in the walls... I've seen these engines out to 88mm, but this requires a special head gasket (at least) as the standard gaskets max out at 87.2ish inside the fire ring.
and as for stock rods... your piston will be running out of room for the ring pack.
63.9mm stroke (1500), uses a conrod that's 128.5mm long, and to get the piston to zero deck is approx 35.0mm compression height (+-0.1mm) ... take away half the diameter of the gudgeon pin (11mm), and the remaining 24.0mm is what you have left to squeeze three rings and ring lands into.
If you stroke the engine by 9.6mm to 73.4mm, your going to push the piston 4.8mm further up the block, thus requiring a piston with just 19.2mm to squeeze the ring pack into, minimum you would need is very skinny rings, I doubt the stock ones would fit in this space (reliably)
have a quick read of this...
http://www.turbo124.com/forum/viewtopic.php?f=10&t=7402
personally I think the 1600cc option hits the sweet spot in terms of rod ratio and bore/stroke ratio
Keule, Whats the 73.4mm stroke crank from???
SteveC
Last edited:
yugoracing
True Classic
That can be only custom order crank but is not problem with pistons 30mm comp.height to installed all in block ( 73,5-63,9=9,6 9,6:2=4,8mm shorter pistons ....
