i worked 180B head on L20b engine that ran on a timing curve like this
http://us.f1f.yahoofs.com/bc/40c021...zjkCBGK JtEK3t
total useless past 3000 rpm with stock dizzy but used to go good with about 25 deg to much advance and never melted the pistons! and what a racket it used to make.
in the beging after bolting it down i nearly lifted the roof off the car port
trying to start it then The big bang +flash of light.
split the mufflers open like they where wet paper bags.
was able to arc up in second gear
it used to carbon up plugs in about 3 months ,heat range 12 i think
i still have a few of them,the bearings in block lasted less than a year
i later reduced the comp ratio 8 to 1 this brought the total advance back to 22 deg past 3000rpm.
i felt my old engine at 8 to 1 comp had more power than the stock one im running now
i also found that changing the L20 cam to a L18 cam made a slight diffrence the knocking was less with the same timing ,but no recorded values .
here is some results of my engine
i have data recording on accerelation figures on current motor
eg 1st gear is about 13 to 14 rpm increase per pistion firing.
http://smokingwheels.myphotoalbum.com/view_album.php?set_albumName=2003
my mate ......helped me toss the motor out but we didnt rip the head off
im about to start work/recreate this strange thing again on a 4 cyc head in my bluebird which now has a notebook fitted to control the timing.
this program has taken over 5 years to complete.
i have data recording on accerelation figures on current motor
eg 1st gear is about 13 to 14 rpm increase per pistion firing.
the computer is not that fast only 200mhz but will run a 4 cyc near 10K rpm just
ive got 3 inputs hooked up to change things like vac adv,temp,
revlimiter.
if my new one runs ok i will port the head on 280zx the same way.
Ps: if anybody would like to convert this to english please let me know