Bore/Stroke
01-07-2004, 04:42 PM
#1
Guest
Posts: n/a
Bore/Stroke
I have a pretty simple question.
To get the motor of a 280zx to 3 liters, does it require a bore and stroke? Or is it only an overbore?
My car is not yet on the road, but several weeks ago I drove it up and down my driveway (clear the engine out a bit, get the batery recharging, spin the tires, you know) I made a few "lively runs" and there was a little bit of smell. I don't THINK it was oil, but it could have been.
The way I see it, if I have a leaky head, I can replace it with a new ported/polished aluminum one (if I can find it). If its rings, thats easy. Maybe swap to flat top pistons at the same time. If my walls are scored however, I could overbore. Would I be able to reach 3 liters on a traditional overbore? How much is a normal amount for a bored engine? I don't know if I would want to deal with installing a stroker kit at the time.
To get the motor of a 280zx to 3 liters, does it require a bore and stroke? Or is it only an overbore?
My car is not yet on the road, but several weeks ago I drove it up and down my driveway (clear the engine out a bit, get the batery recharging, spin the tires, you know) I made a few "lively runs" and there was a little bit of smell. I don't THINK it was oil, but it could have been.
The way I see it, if I have a leaky head, I can replace it with a new ported/polished aluminum one (if I can find it). If its rings, thats easy. Maybe swap to flat top pistons at the same time. If my walls are scored however, I could overbore. Would I be able to reach 3 liters on a traditional overbore? How much is a normal amount for a bored engine? I don't know if I would want to deal with installing a stroker kit at the time.
01-08-2004, 09:39 AM
#2
The Evil Twin
Join Date: Mar 2001
Location: Seattle, WA
Posts: 9,294
The boring is much easier to accomplish. The whole task of installing a stroker crank is much more expensive. I believe you can achieve pretty close to a 3.0 just by boring.
2.95 or so which rounded up could be called a three liter. The little bit of displacement isn't going to add lots of power. Its how you build the engine in other ways... but the added air capacity will help.
The problem is that the typical KA24DE flat top pistons that can be used are shorter and will have a negative deck height which lowers compression. With a stroked crank they have a slightly positive deck height and need a tall head gasket. Its very complicated either way.
2.95 or so which rounded up could be called a three liter. The little bit of displacement isn't going to add lots of power. Its how you build the engine in other ways... but the added air capacity will help.
The problem is that the typical KA24DE flat top pistons that can be used are shorter and will have a negative deck height which lowers compression. With a stroked crank they have a slightly positive deck height and need a tall head gasket. Its very complicated either way.
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