Author Topic: Tired 2.5  (Read 53 times)

0 Members and 1 Guest are viewing this topic.

Offline 95 Lowbuck

  • Member
  • Posts: 139
Tired 2.5
« on: November 20, 2021, 09:12:21 AM »
Iíve got a tired 2.5 with 180k, two holes are good, two are weak.
Along with the timing chain making racket, iím thinking about rebuilding the original engine.
Funny, it doesnít burn a drop of oil, but see some blow by from the valve cover.
Want to keep it basically stock, but what would be some improvements I could make.
1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.

Offline Jeffy

  • Administrator
  • Member
  • *****
  • Posts: 14919
Re: Tired 2.5
« Reply #1 on: November 24, 2021, 12:00:23 AM »
I'd probably consider a 0.30-0.40" over.  Roller rockers and port and polish.

I'd be tempted to do a stroker kit.  Yeah, some people might say it's dumb for a 45% increase but that would get you into 4.0L territory but 200 lbs less weight.  The nice thing is that the 4.0L uses most of the same parts as the 4.0L's.

How many miles are on your engine?
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline 95 Lowbuck

  • Member
  • Posts: 139
Re: Tired 2.5
« Reply #2 on: November 24, 2021, 04:51:53 AM »
About 180k on the stock bore.
Iím thinking a little head work and bumping compression slightly,
nothing too radical.
Living in California, I still have to pass smog.
1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.

Offline Jeffy

  • Administrator
  • Member
  • *****
  • Posts: 14919
Re: Tired 2.5
« Reply #3 on: November 24, 2021, 01:44:26 PM »
I'm in CA as well.  From what I've heard, as long as you don't go too radical on the cam, you can run a stroker.  Lots of people run stroker 4.0Ls and pass.  I know the apprehension though.  I'm really thinking about going SC.  Not CARB legal but I'm willing to tear it out every two years.  We'll see though.  Installing a SC is one thing.  Being able to return it back to stock is another.

Not sure if I'd screw with the compression.  It's already 9.5:1.  I wouldn't want to have to run premium.  Though I'm sure I'd pick up a few hp if I ran premium in my engine. 108K isn't a lot of mines though.  I've got 109K on mine and it's pretty tight.  When I flopped it on its side, it didn't even smoke on startup.
Youtube Channel: https://www.youtube.com/channel/UCZNlr60GXH5OlKIFrT7P6mg
My Jeep: http://4bangerjp.com/forums/index.php?topic=2783.0
"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline 95 Lowbuck

  • Member
  • Posts: 139
Re: Tired 2.5
« Reply #4 on: November 24, 2021, 03:21:37 PM »
 It has 180,000 on the engine.
Quite frankly I would run it more if it didnít sound like
a bunch of marbles floating around in there,
and the blow by out the valve cover.
Doesnít burn a drop of oil.
Itís about time to do something.
1995 YJ RioGrand, 2.5, AX5, 231 T.C., A.A. SYE,
D30, XJ D44, Truetracs F+R, CV D.S. F+R, 4.88's
R.E. 4" STD., 33-10.50 BFG KO2's on stock rims.