FYI, this is what I recommend for this application
Lift in inches, duration at .050"
440/218 torquer/street power, mildly rough idle
465/224 street/strip type grind, rougher idle
480/232 street/strip/excellent midrange-needs gearing rough idle
500/260 insane top end race only
Stock is 390/200
Stock Isuzu 2.6 cam
Duration at .050 170 degrees
I assume nominal duration start of lobe lift to end of close at 248-254 max degrees.
Lift (I assume at lobe) .231 x1.65 rocker=.38115 (.381) at valve.
Lift per JLemond 10MM=0.3937 (.394) (I assume at valve)
Lobe centers 111 degrees
Lash int= .008 ex= .008
Calmini 2.3-2.6 cam
Duration at .050 175 degrees
Start of lobe lift to end of close ?
Lift (I assume at lobe) .241 x1.65 rocker=.39768 (.398) at valve.
Lobe centers 108 degrees
Lash int=? ex=?...
It's all about power band.
Tell me where you're going to rev, and I'll give you the duration to do it, and as much lift as I can for the given profile.
2.6/2.3's use the same cam, headers too. The Delta reground cams are about $120, the 260 is for low end torque, the 270 produces power about 700 rpms higher. You need to install swivel foot valve adjusters from a Porsche 911 or VW valve stem caps to keep the contact patch more correct. EMPI is a good brand. The Calmini cam is a new billet, use the stock valve adjusters, it is similar to the Delta 270, but is $300 or so. The 4ZD1 head from the '88 & '89 EFI Impulse had the larger 2.6 valves & no provisions for a mechanical fuel pump. The 2.6 valves and seats can be installed into any 4ZD1 head. You can also get a compression boost using the late model 2.6 head that were on engines with the pie-shaped dish in the piston top. When fitted to an engine with the round piston top dish it increases the compression much like using a 4ZD1 head and already has the 2.6 valves.
All good questions but I think this conversation should go into a new thread started by you in one of the the drive train forums (keep this thread just about CAMs). Welcome to the Planet!muddy amigo wrote:Hey ya'll I have a 94 amigo and I am gettin tired of it not having the power I need it to have. How hard is it to install a cam? I might get the 270 cam that was mentioned earlier here. And while I am doing major engine work I have a clicking valve that I want to take care of. Anyone know where I can get some good valves?
Users browsing this forum: No registered users and 5 guests