'97 Corvette engine, DIS

[Terry Hartman]

> 
> From: dave.williams at chaos.lrk.ar.us (Dave Williams)
> 
> - -> Are the rumors true, Direct Ignition on the '97 Corvette 5.7l LT1?
> - -> Are there any technical tidbits available? Feed me info ...please!
> 
>  I haven't seen anything about why they went to eight coils instead of
> four dual coils.  I know the Ford 4.6 uses different spark plugs for
> each side of a dual coil, but most engines don't bother.

Supposedly - this is to help with individual cylinder timing.  If one
of the two knock sensors picks up detonation, only that cylinder's
timing will be affected...

> 
>  The LS-1 is a completely new Chevrolet V8 engine with no parts
> interchanging with the old small block, or the LT5 for that matter.
> 3.9x3.6 bore/stroke, four bolt heads, evenly-spaced ports, gerotor oil
> pump driven off the front of the crank, thrust main now on center
> bearing, etc.
>                                                                           

There ARE some parts that interchange, although they are minor.  The
hydraulic roller lifters and I believe rod bearings....

later,

T.