Aces Killshot Fusion EFI Swap

[scotts90ranger]

Technically yes timing but what's most likely happening is the spark is jumping to another cylinder with the offset. It's basically how the HVS flat top distributors that GM used in the late '90's work but with that they have a separate crank sensor for rpm and just a 1x cam sensor. With those you have to align the cam sensor to TDC to center on the spark output contact things...

 

[85_Ranger4x4]

Technically yes timing but what's most likely happening is the spark is jumping to another cylinder with the offset. It's basically how the HVS flat top distributors that GM used in the late '90's work but with that they have a separate crank sensor for rpm and just a 1x cam sensor. With those you have to align the cam sensor to TDC to center on the spark output contact things...

How I picture it is at low rpm it basically runs at base idle. As it revs it starts playing with the timing advance and it walks it from one cylinder to the next.

 

[scotts90ranger]

How I picture it is at low rpm it basically runs at base idle. As it revs it starts playing with the timing advance and it walks it from one cylinder to the next.

Yes, if it's off enough it'll move to the next cylinder in the firing order once the advance is enough to make that contact closer than the one it's supposed to go to

 

[85_Ranger4x4]

I got a new dizzy and no major parts seem to fall off... and they are not planning any severe weather so hopefully I can try it tonight

 

[85_Ranger4x4]

I got the dizzy stuck in it. I had to dig thru the stash and find a longer plug wire for #2, it wouldn't reach with the smaller cap. Lined the paddle under the rotor with the pickup coil sensor and set it to 15* BTDC again.

The smaller distributor is much nicer to work around, not having the vacuum can lets me put it wherever I want. I purposely moved it a tooth just to have more room for the cap clips around the heater hose lol.

It started right off. I sneaked it out and turn it around so I can let it run outside while still have light in the engine bay and nosed into the garage. Hooked the timing light and the laptop up to it and locked out the timing advance in the computer. Checked the timing quick and it was right on. Let it warm up, only wiggled the cap back and forth to check the line was centered on the pointer and locked it down. Unlocked the timing in the computer... slowly eased it to 2400rpm without issue. Then I reset the fuel learn table to get rid of whatever weird algorithm it cooked up with the screwy timing, gathered my courage and took it on the road.

Ran normally on my gravel road a half mile up to the end, turned around and went to the next stop sign about 3 miles away and it drove great. Couldn't take it anymore and let it breathe a bit on the way back... holy crap. Power for days. Smooth and beautiful, honestly the truck has never ran better based on that short test drive.

I need to secure the fuel lines along the frame and get the interior back together and just run the thing at this point. I also really need to sneak it to a gas station and put fuel in it too lol.

 

[Curious Hound]

Congratulations!!!!

 

[scotts90ranger]

Sweet, glad it was just timing jump, that symptom can be a jerk! Without having a crank sensor to gauge the difference it would be difficult to find, glad it worked out!

 

[85_Ranger4x4]

As I was swapping the distributor last night



And tonight:



Put all the intake tubes back on and whatnot and put tools away tonight. Just a plain old 4bbl 302...

 

[85_Ranger4x4]

Secured the fuel lines after work today and took it for a maiden voyage on the highway,

Pulled out and let it sing... and about 3500rpm it starts popping again.

Ran around town taking it easy, otherwise didn't go too bad.

Get home and play with the first distributor more...



Apparently "locked" means different things to different people?

I got side tracked when the thing fell apart I really didn't look at either of them too hard aside from making sure the gear wouldn't fall off the second one. The one in the truck does have mechanical advance just like this one as well.

I pulled each weight off looking for a way to lock it up and nothing jumped out. Of course no paperwork and no info on line for them.





So I have a return ticket for both of these POS's now. I was hanging onto the first one to make sure I wasn't going to need to swap parts for the second one.

Looking into rephasing the DS dizzy now... although it is becoming very tempting to just throw Duraspark back on the thing.

 

[SenorNoob]

I get that it's "not as advertised" so you're sending it back. But shouldn't any spring and weights based advance be as simple as replacing the springs with something solid?

 

[Curious Hound]

But shouldn't any spring and weights based advance be as simple as replacing the springs with something solid?

Wrap a piece of bailing wire around all the moving stuff and make it snug.