Eddy 1405 tuning advice
So I shelved the dual quad adventure for now and have swapped back LD4B and 1405. Issues are exhaust backfiring at cruise or deceleration. Occasional surge at cruise.
Everything was stock base/calibration. I verified primary pistons are down at idle, orange springs.
Timing 15*
Ported vac is 13" in park, 10 in gear.
***EDIT, MANIFOLD VAC***
Ported vac is where VA is hooked to.
Rpm in park is 750 and 625 in gear.
Transfer slots damn near square
IMS DS 1 1/2 turns out, PS 1 3/8.
**besides intake swap I also adjusted valves a tad tighter** World of difference in torque compared to before!!
Idle is good, nice crisp, but on cruise/decel I get backfire.
So I figured rich being a 1405 on a 273(avg compression 135).
Soi went down a rod and pulled the stock 1451 and installed 1457.
Issues are now magnified, while on cruise, more frequent exhaust backfires, plu at low speed it now stalled out 3 times in a matter if 1/2 hour at 25 mph max. Fired up after a few(2/3 minutes).
Pic of #1 plug.
Suggestions?
I was going to go to richer on the rod, but doesnt make sense to me..plus I gotta order them.
Thanks
So I shelved the dual quad adventure for now and have swapped back LD4B and 1405. Issues are exhaust backfiring at cruise or deceleration. Occasional surge at cruise.
Everything was stock base/calibration. I verified primary pistons are down at idle, orange springs.
Timing 15*
Ported vac is 13" in park, 10 in gear.
***EDIT, MANIFOLD VAC***
Ported vac is where VA is hooked to.
Rpm in park is 750 and 625 in gear.
Transfer slots damn near square
IMS DS 1 1/2 turns out, PS 1 3/8.
**besides intake swap I also adjusted valves a tad tighter** World of difference in torque compared to before!!
Idle is good, nice crisp, but on cruise/decel I get backfire.
So I figured rich being a 1405 on a 273(avg compression 135).
Soi went down a rod and pulled the stock 1451 and installed 1457.
Issues are now magnified, while on cruise, more frequent exhaust backfires, plu at low speed it now stalled out 3 times in a matter if 1/2 hour at 25 mph max. Fired up after a few(2/3 minutes).
Pic of #1 plug.
Suggestions?
I was going to go to richer on the rod, but doesnt make sense to me..plus I gotta order them.
Thanks