Small port 4age with big port cams - Timing & Injector questions
Posted: Mon Sep 11, 2017 12:11 pm
Hey Guys,
So I just finished doing a full rebuild on my small port 4age w/ big port cams. (I remember reading years ago about this, and how it gave a mild performance upgrade)
Currently the engine is running on all stock big port electronics including injectors. Also, has a TRD .8mm head gasket
Engine seems to be running fine and sounds good, starts good, idles well. but the timing it at 30 degrees. Like on the little timing mark area you have the spread from +15,+10, +5, 0, -5. and I'm easily around +30 maybe even +40. If I move the distributor ahead a tooth and its idling at like 3500rpm and drop it back a tooth and it wont start at all.
Is this because I'm running big port electronics and injectors? or maybe the cams are ground with a different timing setting from big port to small port?
If I swap to the small port injectors and keep the big port harness I need to cut and loop(bypass) the wires on the resistor box that mounts near the passenger strut tower under/near the air box?
I've looked around and used the search function and maybe the info I'm looking for is lost on the old forum?
Just wanted to see if this is all normal, or if I'm dialing in my engine at a wonky setting that will cause damage down the road
So I just finished doing a full rebuild on my small port 4age w/ big port cams. (I remember reading years ago about this, and how it gave a mild performance upgrade)
Currently the engine is running on all stock big port electronics including injectors. Also, has a TRD .8mm head gasket
Engine seems to be running fine and sounds good, starts good, idles well. but the timing it at 30 degrees. Like on the little timing mark area you have the spread from +15,+10, +5, 0, -5. and I'm easily around +30 maybe even +40. If I move the distributor ahead a tooth and its idling at like 3500rpm and drop it back a tooth and it wont start at all.
Is this because I'm running big port electronics and injectors? or maybe the cams are ground with a different timing setting from big port to small port?
If I swap to the small port injectors and keep the big port harness I need to cut and loop(bypass) the wires on the resistor box that mounts near the passenger strut tower under/near the air box?
I've looked around and used the search function and maybe the info I'm looking for is lost on the old forum?
Just wanted to see if this is all normal, or if I'm dialing in my engine at a wonky setting that will cause damage down the road