Is the Miata a 'unibody' construction? Or does it have a frame? Went to Miatanet and could not find the answer.
Yes. Just about every production car has been for decades, except
Also Saturn (They call their construction 'space frame'; plastic body panels make lousy structural members), and I think the Crown Vic is still body-on-frame.
Oops, forgot about Saturn, thanks. But its underbody is still pretty much a monocoque with a Tupperware skin, right? Like the unlamented Fiero.
I barely consider the Crown Vic a car. It's actually a crippled truck, isn't it? The sedan version of the Excrution?
Please don't knock the Crown Vic. It's just about the only roomy, affordable RWD car available today. They're great for long trips and the Marauder version promises to have more power. The CV actually has a place in this world if you ask me. Take it away and we'll just have that many more SUVs
My only complaint about the Crown Vic is that the civilian ones are too hard to tell from the Police ones at first glance....
Perhaps Ford should avoid selling black or white to regular folks! (We've got a few white CV taxicabs around here, and they look TOO much like the Man- even having the spotlight on the A-pillar)
As I understand it the Miata uses a frame not commonly used. There is a power frame down the center of the car holding the engine etc. There is also the unibody construction for most of the rest of the car, along with some elements of a space frame.
There's nothing special about the PPF (PPF = Power Plant Frame). It's merely a piece of metal that ties the tranny to the diff. In terms of chassis stiffness, it does nothing since it doesn't attach to the chassis, so technically it is not part of the chassis.
In other words, the Miata uses a standard unibody construction with the addition of the PPF to tie the tranny & differential together (but isn't attached to the chassis). Nothing space frame about it IMHO.
I think the reason for the separate power plant frame is to allow the drivetrain to be more easily attached to the car during
Really? All cars have them?
Does not sound very dramatic, does it?
The question asked was:
Not 'what is the chassis stiffness of the Miata?' The PPF has a significant influence on the forces experienced by the chassis and its behavior. That is why it is there.
Yamaguchi and Thompson report that Mazda found the PPF has a significant benefit in throttle response and elimination of shudder, *****, and vibration.
So to answer the question: the forces on the Miata are partly supported by a unibody and partly by a separate frame.