3.4 swap into 1985 Jeep Cherokee questions?

[geoffinbc]

Nah I would just leave the heads on. Unless you think you should inspect the pistons and cylinders. The pressurization tool for the cylinders is cheep and convenient makes quick work of spring changes.

[cardana24]

Nah I would just leave the heads on. Unless you think you should inspect the pistons and cylinders. The pressurization tool for the cylinders is cheep and convenient makes quick work of spring changes.

Which tool is the right one? I looked at the links the were posted and one of them just looks like a little thing that screws into the spark plug holes...is that the right one?

I have a video of the engine running and not smoking or anything so I do not have any reason to believe that something in the bottom end of the engine is bad.

I did not get a chance to work on anything today but here is a pic of how I left it yesterday. I got dampner off then the timing chain cover, and I took the exhaust off, then the most time consuming part was scraping all of the old gasket material off of the timing chain cover area and the valve cover gaskets. Does everything still look fine?

[geoffinbc]

Yes the tool is the one that screws into the plug hole. The other end attaches to a compressor.

[cardana24]

Yes the tool is the one that screws into the plug hole. The other end attaches to a compressor.

do you know where you can buy it locally rather than getting it online? I assume when you buy it the tool will tell you how much pressure you should be running to it?

[geoffinbc]

Any parts store will have it. You can just run a few PSI. 25 PSI will do it. Just remember to leave your compressor on because they cylinders do leak down so the compressor will need to be able to recharge.

[cardana24]

Assuming I am going to run this set up with the stock SFI system from the Camaro, i will need to bypass the VATS system. Does anyone know if this product will work? For the price it looks like it could save me a lot of time.

http://www.wirelesshut.com/0/10929678.html

[cardana24]

Any parts store will have it. You can just run a few PSI. 25 PSI will do it. Just remember to leave your compressor on because they cylinders do leak down so the compressor will need to be able to recharge.

on all of the air hold valves I found they want a pressure of 90-125 psi. I ordered one from summit yesterday. Now if my valve springs and retainers would ever come in I can move along with this project. I have decided to take a shot at running this on the SFI system since I have so many of the parts needed already. I am going to order a VATS bypass, and I will need to get a different fuel pump. I am assuming I can just use the stock Fuel pressure regulator that is still mounted to the rail, I will just need to run a return line. Any advice on fuel pump or anything else envolved in running the SFI system? Also the ECM that I have is from an auto, but I have a five speed...will this make a difference? Does the ECM even have any connections that go to the tranny?

[geoffinbc]

Yea your going to have to find a chip from a manual trans car. If you want to use the SFI system I STRONGLY recommend an in tank pump. Use any Jeep pump that was used on the 4 or 6 cyl SFI engines. They will supply the fuel you need. Like I said if you can get the tank with sending unit from the junkyard then do that. Then all you need is the return line and off you go.

[Canyonero]

With my Trooper SFI swap, I just nabbed a fuel pump and pickup assembly from 4 cyl Trooper (the 4 cyl used multiport). Dropped right in and worked great, one of the few things in my project that did. Might see if you can do something similar, grab a newer Jeep's fuel pump assembly.

[cardana24]

I will try to pick up a 5 speed ecm. The harness I have will work with this correct?

Why do you suggest the intank pump so strongly over the inline? I am just curious because swaping fuel tanks was not something I was planning on.

Oh, and I picked up a VATS system bypass on ebay. With shipping and insurance it was not even 30 bucks so that sounded a lot better than wiring a bunch or resistors.

[Canyonero]

It is much more efficient to push fuel than to pull it. Less chance of collapsing your fuel lines with the tank in the pump, considering the great increase in pressure you'll be dealing with.

[cardana24]

It is much more efficient to push fuel than to pull it. Less chance of collapsing your fuel lines with the tank in the pump, considering the great increase in pressure you'll be dealing with.

I'll see what I can dig up. I'm guessing a 4.0 inline 6 would be a good place to look since they make more power than the 3.4

[cardana24]

Also, now that I am going with the SFI set up what am I going to need to use from my old 2.8 engine? Would I still need to swap the oil pan/pick up? I am guessing I can just run the serp. belt now instead of the V belts. What am I missing?

[geoffinbc]

In line pumps suffer from vapor lock and are less efficient, more noisy and run hot and never last as long as an in tank pump.

[cardana24]

In line pumps suffer from vapor lock and are less efficient, more noisy and run hot and never last as long as an in tank pump.

I'm trying to find out which tanks are the same size as what I currently have so I will not need to modify much for it to fit.

Do you have any input on my post 43?