Gday all, been quiet on here for a while so I thought I would post up the results from my recent JZED headed engine build...
Very happy with the results for what it is, runs on pump 98, standard stroke, .030 over and has only off the shelf HM9C headers, re-welded to the JZED flange.
It made 352hp on engine dyno at 6700 and held it to 7000rpm. Made 285 ft/lb at 4500 and pretty much holds (and revisits this number) to within 15 ft/lb through to 7000rpm, very flat torque curve.
Cam is relatively mild solid flat tappet, was worried about a roller lifter dropping its guts as its a pure street car that does extended idling in sydney, even though with a softer profile the roller may have been ok, it worried me.
Engine idled like a dream on the dyno, very smooth.
Even though this is an expensive combo to put together, it is not a 'no expenses spared' kind of setup.
Here are some specs, for those who are interested- its a fairly typical bottom end, similar to what most good 9 port engines would run.
-12:1 compression
- 48 DCO/SP webers
- forged pistons using 1.2mm compression rings from Total Seal
- H beam honda rods
- standard blue crank, no mods to counterweights, drilled snout and flywheel bolts 7/16.
- Sonic girdle
- half grout fill
- cam is low 250s@50.
- Timing was 29 degrees
- uses ATI balancer and custom hub
- Davies Craig electric water pump
The engine made 260hp at 4850rpm, which is more than what my 9 port head made at 6500rpm. Made 325hp at 6100rpm. I am very happy with this considering the cam and lack of dry sump/vacuum pump and just using 98 premium straight from the bowser. Most of the JZED headed deals that made high 300s like 370-380hp are running big solid roller cams- a fair bit more duration and lift than what I am running, custom 1 3/4 inch tuned length pipes and vacuum pumps etc... considering its a pure street car, rightly or wrongly, I didn't want to go that far.
If anyone wants to see the dyno video or dyno sheets, PM me with your number and I will send it through, cant seem to put these here using the system at the moment.
Edited by LC-GTR-1969, 27 December 2019 - 07:55 AM.