BDY (and DKZ/D6B) head1
| diameter | length | |
|---|---|---|
| Inlet | Ø41.5mm | 108mm |
| Exhaust | Ø34.5mm | 108mm |
| stock XU5 M3/Z | XU7 piston and crank | XU7j4 piston and crank2 | |
|---|---|---|---|
| chamber (8mm deep) 3 | 34.0cc | 34.0cc | 34.0cc |
| piston dish | 9.0cc4 | 12.0cc [?] | 2.0cc |
| head gasket (1.2mm) | 6.5cc | 6.5cc | 6.5cc |
| deck clearance | 0.1cc | 0.0cc | 0.0cc |
| compressed volume | 49.6cc | 52.5cc | 42.5cc |
| bore | 83mm | 83mm | 83mm |
| stroke | 73mm | 81.4mm | 81.4mm |
| displacement volume | 395cc | 440.5cc | 440.5cc |
| compression ratio | 8.95:15 | 9.4:1 | 11.4:1 |
| rod length | 150.5mm | 150.5mm | 150.5mm |
| piston compression height | 37.5mm | 33.3mm | 33.3mm |
XU5/XU7 Hybrid
A Si XU5M motor fitted with XU7JP4 crank, rods, pistons, liners, oil pump and sump ... makes a free reving 1.8 8v motor with a very nice rod ratio. Compression ratio will be up there at around 11:1. as pistons are almost flat (maybe-1 or -2 cc) and they sit flush with deck.6
aussiefrogs performance 8v cylinder head buiild
aussiefrogs Cheap 205 kW (archive)
-
https://www.aussiefrogs.com/forum/index.php?threads/xu9-engine-musings.95203/post-1031251 ↩
-
https://www.205gtidrivers.com/forums/topic/84170-xu7j4-info/ ↩
-
https://www.aussiefrogs.com/forum/index.php?threads/xu9-engine-musings.95203/post-1031420 ↩
-
https://www.aussiefrogs.com/forum/index.php?threads/xu9-engine-musings.95203/post-1031279 ↩
-
https://www.aussiefrogs.com/forum/index.php?threads/fs-xu5-hybrid-si-motor-vic.138311/ ↩