Quote Originally Posted by R2 Racing View Post
Mark, I was under the impression that this chassis has had several things done to it that were not IT legal. I think Matt even told me it was closer to a LP Prod car than an IT car. If the car is otherwise 100% IT legal other than your engine being a Y8 instead of a Z6, I wouldn't have a problem with it.

For those who don't know, the D16Y8 came in the '96-'00 EX (the 'EK' chassis) while the D16Z6 came in the '92-'95 EX (the 'EG' chassis). Both cars are classed in ITA at the same weight, 2305lbs. The engines are almost identical, with the block and head molds being the same, but IIRC the Y8 is factory rated at about +2hp over the Z6.
here are the specs
D16Z6

* Found in
o 1992-1995 Honda Civic Si
o 1992-1995 Honda Civic EX, EX-V
o 1992-1995 Honda Civic ESi (European Market)
o 1993-1995 Honda Del Sol Si (US)
o 1993-1995 Honda Del Sol ESi (European)
+ Displacement : 1,590 cc (97 cu in)
+ Bore and Stroke : 75 mm × 90 mm (3.0 in × 3.5 in)
+ Rod Length : 137MM
+ Rod/Stroke : 1.52
+ Compression : 9.2:1
+ Power : 125 hp (93.2 kW, 127 ps) @ 6600 rpm
+ Torque : 106 ft·lb (14.7 kg/m, 144 Nm) @ 5200 rpm
+ Redline : 7200 rpm
+ Fuel Cut : 7411 rpm
+ VTEC Switchover : 4800 rpm[3]
+ Fuel Control : OBD-1 MPFI
+ Head Code : P08
+ ECU Code : P28
D16Y8

VTEC

Also available in New Zealand under the code D16Y6

* Found in
o 1999-2000 Honda Civic SE 1.6 Vtec (UK)
o 1996-1999 Honda Civic EX Sedan
o 1996-1999 Honda Civic EX Coupe
o 1996-2000 Honda Civic EX (US)
o 1996-2000 Honda Civic SI (Canada Only)
o 1997-2000 Acura 1.6EL (Canada Only)
o 1996-1997 Honda del Sol Si
o 1997-2000 Rover 416 Auto
+ Displacemnt : 1590cc
+ Bore and Stroke : 75 mm × 90 mm (3.0 in × 3.5 in)
+ Rod Length : 137 MM
+ Rod/Stroke : 1.52
+ Compression : 9.6:1
+ Valvetrain : SOHC 4 valves per cylinder
+ Power : 127 hp (94.7 kW, 229 ps) @ rpm
+ Torque : 111 ft·lbf (45.79 kg/m, 145.1 Nm) @ rp
+ Head Code : P2J
+ Piston Code : P2P
+ Redline 7200 rpm
+ ECU Code : P2P


the compression difference comes from the head chamber IIRC. And also the Intake Manifold is of different design.