Post by zep on Jan 31, 2007 7:41:04 GMT 12
Copied from OzGemini
Apparantly this should make 140kw at the RW (which is heaps considering the torque of these engines).
go for 12:1 static compression and a cam with huge overlap - something like a 40/78 with 520+ thou lift
CDI ignition (microtech\haltech run) with quad coils direct fire
Get your head ported to flow over 180cfm in na - oversize valves, big
porting (CNC), custom inlet manifold with as little as possible a drop in
angle between your port entrace and the manifold runners.
quad 50mm throttle bodies with velocity stacks (bell mouths)
Forged pistons of good quality (read not arias), balanced entire bottom end -plus billet flywheel - o-ring the block and get it square decked for truancy. Get the crank cross drilled and throw some clevite or king bearings in it.
If you can afford it, get some forged resized rods - something that will
give a rod ratio of about 1.68-1.70 if possible - this will ensure your
motor can rev to 8000rpm reliably whilst keeping the same high compression - this will need some thinking out though, cos a rod ratio of 1.7 or thereabouts will mean some long skirt pistons to keep the same stroke which adds extra weight so reduces ability to rev somewhat. - while you're at it, bore the 4ze1 block 240thou to increase the ability to rev - bring that undersqaure block back to reality a little bit
oil pump can remain standard - just baffle the sump properly with scavenge feeds and modify the pickup to sit a little lower for extra protection. run 10w/50 penrite hpr semi synthetic
280cc injectors with an uprated pump all tuned on 98 or 100 ron fuel on a dyno - should make you your 140 rear wheel kilowatts
* edit - this setup will need a good set of handmade extractors of a 4-1 design - the 4ze1 makes enough torque down low cos of its stroke, so dont mess around with 4-2-1 extractors or any off the shelf type - you will need some 42mm runners with primary pipes being about 24" long with a good collector straight into a high flow 2.5" cat
Apparantly this should make 140kw at the RW (which is heaps considering the torque of these engines).
go for 12:1 static compression and a cam with huge overlap - something like a 40/78 with 520+ thou lift
CDI ignition (microtech\haltech run) with quad coils direct fire
Get your head ported to flow over 180cfm in na - oversize valves, big
porting (CNC), custom inlet manifold with as little as possible a drop in
angle between your port entrace and the manifold runners.
quad 50mm throttle bodies with velocity stacks (bell mouths)
Forged pistons of good quality (read not arias), balanced entire bottom end -plus billet flywheel - o-ring the block and get it square decked for truancy. Get the crank cross drilled and throw some clevite or king bearings in it.
If you can afford it, get some forged resized rods - something that will
give a rod ratio of about 1.68-1.70 if possible - this will ensure your
motor can rev to 8000rpm reliably whilst keeping the same high compression - this will need some thinking out though, cos a rod ratio of 1.7 or thereabouts will mean some long skirt pistons to keep the same stroke which adds extra weight so reduces ability to rev somewhat. - while you're at it, bore the 4ze1 block 240thou to increase the ability to rev - bring that undersqaure block back to reality a little bit
oil pump can remain standard - just baffle the sump properly with scavenge feeds and modify the pickup to sit a little lower for extra protection. run 10w/50 penrite hpr semi synthetic
280cc injectors with an uprated pump all tuned on 98 or 100 ron fuel on a dyno - should make you your 140 rear wheel kilowatts
* edit - this setup will need a good set of handmade extractors of a 4-1 design - the 4ze1 makes enough torque down low cos of its stroke, so dont mess around with 4-2-1 extractors or any off the shelf type - you will need some 42mm runners with primary pipes being about 24" long with a good collector straight into a high flow 2.5" cat
