I think some specs would clear this up.
I think some concrete spec's on your car would eliminate all this huff about what your engine size is and how you can go so fast in the 1/4 as well as put out 250hp.
Let's start with the engine. It's a L6, and there were three different cranks made for this engine:
(240Z)73.7mm
(260Z/280Z/ZX)79mm
(Diesel Maxima)83mm
Pistons sizes range from:
83mm(240Z)
86mm(280Z)
Other pistons from other engines that will fit:
89mm(KA24)
89mm (Z24)
87 (Z22)
All of these can come in +1mm over, but not +2mm These would have to be custom made by Venoila etc....
In order to get 3.1L or @3100cc there are two ways, either stroke and/or bore out the engine.
Combination #1:
79mm Crank, 91mm Pistons = 3082cc
This is not likely, since this equates to a (.200)5mm overbore which is virtually unheard of, because of the thinning of the cylinder walls. 90mm is the max piston size for almost any L series engine. Most overbores are from 1mm to 3mm.
Combination #2:
83mm Crank, 89mm Pistons = 3098cc
Most likely, as these crankshafts can be found and provide a quick way to increase displacement.
I believe you have a 83mm crank, and is why your engine is limited to 6500rpm. Although, these cranks can go higher, they don't tend to like it very much, as piston speed is quite fast, and alot of stress is placed ont he crank at those rpms. All of the 3.1L or 3.2L engines have always shifted at or before 6K. I don't know of anyone who wants to or does shift over that.
So, my point is this. I believe you have a fast car, but your lack of specs, makes it hard for others to comprehend exactly what you've done to your engine/car. Maybe you can ask your mechanic for a spec sheet on your engine/car. It would be beneficial to you at shows, if someone asks you the same questions we are all asking you now. You won't sound like a typical Ferrari owner or something. Most of those guys just buy the car, never work on it, and keep posting performance numbers without knowing how the car does it. You are kind of in the same boat, but you seem like you want to learn more about your car, and I encourage you to do so. It is important to know what is going on in your engine, because it allows you to find more hp, as well as determine what direction to go when adding on parts, etc.... Besides, the more you learn, you may be able to do some work yourself, and possibly be less dependent on what your mechanic tells you. It is better to be at the mercy of your own knowledge, rather than the mercy of another. There is never anything wrong with trying to educate yourself.
Looking forward to some specs,
240Dave
P.S. I can post some of mine, if you're interested.
I think some concrete spec's on your car would eliminate all this huff about what your engine size is and how you can go so fast in the 1/4 as well as put out 250hp.
Let's start with the engine. It's a L6, and there were three different cranks made for this engine:
(240Z)73.7mm
(260Z/280Z/ZX)79mm
(Diesel Maxima)83mm
Pistons sizes range from:
83mm(240Z)
86mm(280Z)
Other pistons from other engines that will fit:
89mm(KA24)
89mm (Z24)
87 (Z22)
All of these can come in +1mm over, but not +2mm These would have to be custom made by Venoila etc....
In order to get 3.1L or @3100cc there are two ways, either stroke and/or bore out the engine.
Combination #1:
79mm Crank, 91mm Pistons = 3082cc
This is not likely, since this equates to a (.200)5mm overbore which is virtually unheard of, because of the thinning of the cylinder walls. 90mm is the max piston size for almost any L series engine. Most overbores are from 1mm to 3mm.
Combination #2:
83mm Crank, 89mm Pistons = 3098cc
Most likely, as these crankshafts can be found and provide a quick way to increase displacement.
I believe you have a 83mm crank, and is why your engine is limited to 6500rpm. Although, these cranks can go higher, they don't tend to like it very much, as piston speed is quite fast, and alot of stress is placed ont he crank at those rpms. All of the 3.1L or 3.2L engines have always shifted at or before 6K. I don't know of anyone who wants to or does shift over that.
So, my point is this. I believe you have a fast car, but your lack of specs, makes it hard for others to comprehend exactly what you've done to your engine/car. Maybe you can ask your mechanic for a spec sheet on your engine/car. It would be beneficial to you at shows, if someone asks you the same questions we are all asking you now. You won't sound like a typical Ferrari owner or something. Most of those guys just buy the car, never work on it, and keep posting performance numbers without knowing how the car does it. You are kind of in the same boat, but you seem like you want to learn more about your car, and I encourage you to do so. It is important to know what is going on in your engine, because it allows you to find more hp, as well as determine what direction to go when adding on parts, etc.... Besides, the more you learn, you may be able to do some work yourself, and possibly be less dependent on what your mechanic tells you. It is better to be at the mercy of your own knowledge, rather than the mercy of another. There is never anything wrong with trying to educate yourself.
Looking forward to some specs,
240Dave
P.S. I can post some of mine, if you're interested.