My 1986 2.5 woes, the story continues...........

[Dogote]

I took my head into the machine shop to get a valve job. They cleaned it and found cracks around #2 and #3 cylinders valve seats. I won't be using that head. So now I am thinking I should just find another engine.

 

1. Anyone know a good source for a overhauled 2.5 engine? There's lots on the internet to choose from. Anyone bought one?

 

2. Whats the difference between the early 2.5's and the later 2.5's as far as the block and heads? Can I buy a later one and use it with my renix system?

 

3. Has anyone bought a MPI Cherokee and swapped everything over to a Renix? What will I gain if I do?

 

4. 4.0? I'm going to search the forums and read about others who have done it in a second. I have read something about the fire wall not being right to do it on some early 2.5's. My 1986 is probably one of those. How do I know?

 

5. I probably should just find a parts engine and build one nice one myself out of the 2. But I have so many other projects and this was never intended to be a big project. All I wanted was a little truck to drive around town and haul stuff like building materials. Not having it running puts a hold on other stuff, like insulating my shop and getting organic alpaca poop for the wife garden. 

 

I'm looking forward to the great advice and moral support of this forum.

 

David

[benjy_26]

If I'm not mistaken, all the 2.5 blocks and heads interchange. I'm not 100% on that, though. As far as TBI vs MPI, you'd have more power potential with the MPI engine, but comparing my brother's 2.5 XJ and my 2.5 MJ, I don't feel a big difference in power, and I usually get better mileage than he does on the highway.

[Dogote]

Anyone know anything about these?

 

http://www.quadratec.com/products/51108_0001_07.htm?gclid=CjwKEAjw_7y4BRDykp3Hjqyt_y0SJACome3Tb_BhDmmFr7i9y_Tv3ANzbWhi0fkux5zLOJRobSXz8xoCVeXw_wcB

 

 

For the price, a new head delivered to my house beats the junkyard head for $200 that's a 200 mile round trip to pick up.

[Dogote]

I just bought the Promaxx Head complete with valves and springs. I'll let you guys know how it works.

I'm off to Pratt and Whitney school tomorrow for the new helicopter engines at work. The head should be waiting for me when I get home.

 

$332.00 plus $40.00 to ship it. Not bad. The wrecking yard 100 miles away wanted $200 with no guarantee other than it came off a running engine. They said if I found it was unusable, I could trade it for another, after driving 100 miles each way. The machine shop runs about $250 to clean, inspect, and cut seats and install guides.  $332 is a deal compared to that, and much less running around on my part. I have a lot of free time to do projects with the job I have. I am on call 24/7 though, and for me to go further than 1/2 hour from my helicopter base (or have a beer), I need to have a relief mechanic take over for me. Glad I don't have to take a day off to go get a junkyard head.

[87Chief]

Seems like a good deal to me.  :thumbsup: