identify this movie - Sci-fi film: American teen science project brings people and dinosaurs into present - Movies & TV

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I'm
hoping someone can help me identify the following film that I would have seen in the
early 90's or late 80's. It is a film in the era of Weird Science, Flight of the
Navigator and Explorers.

All I really remember
is that some American teens build a science project which seems to be able to control
time or manipulate time. Different characters from different time periods are brought
into their own.

One scene I remember
which I think is towards the end of the film involves the teens going into their school
or university to where this device is located. When they get to the main hall the area
has been transformed into a Jurassic jungle environment complete with
dinosaurs.

One other very random clip I remember
is a scene whereby a bunch of Hells Angels style bikers arrive or are summoned by this
device ( I'm hoping this isn't bleed-through from another
film...)

Any ideas?

Answer

href="http://en.wikipedia.org/wiki/My_Science_Project">My Science
Project
(1985)

... After Michael and his friends plug it into a power source, it

begins to materialize objects from other times and dimensions.

When
his science teacher (Dennis Hopper) experiments by
plugging the orb
directly into the power grid, it starts a chain reaction
that warp the
dimensions and time around it. Past, present and future collide
in a
whirling vortex which engulfs the school and only Michael and
his
friends can stop
it.

/> href="http://www.youtube.com/watch?v=JkylDvmZl_c&list=UUZd7jt0Vc_gq1p36FJLy0Ug">From
a YouTube clip:

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