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  #16  
Old 01-31-2007, 09:33 PM
rusty70f100 rusty70f100 is offline
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Yep, swept volume over compressed volume. I would say that the 2.8L probably has much larger combustion chambers than the 2.9L.
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  #17  
Old 02-03-2007, 08:56 AM
dirtybroncoii dirtybroncoii is offline
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[QUOTE=rusty70f100]No, you cant. They widened the oil pan rails when they went to the 4.0L. It would not clear.

I Have a 2.8 block on an engine stand in my garage right now WITH a 4.0 crank in it. there is hardly any block indexing to do (for the crank)

Also 2.8 head intake runners wont line up with a 2.9 intake.
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Last edited by dirtybroncoii; 02-03-2007 at 09:00 AM.
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  #18  
Old 02-03-2007, 07:15 PM
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kernel-panic kernel-panic is offline
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Quote:
Originally Posted by dirtybroncoii
Quote:
Originally Posted by rusty70f100
No, you cant. They widened the oil pan rails when they went to the 4.0L. It would not clear.
I Have a 2.8 block on an engine stand in my garage right now WITH a 4.0 crank in it. there is hardly any block indexing to do (for the crank)

Also 2.8 head intake runners wont line up with a 2.9 intake.
That's because the middle cylinders are laid out opposite between the 2.8 and 2.9. The exhaust manifolds aren't interchangeable either. Nor the cams, as far as I know, as the 2.8s have gears and the cam spins the opposite direction. There are only a few interchangeable parts between the two engines, internally or externally.
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-1987 Bronco II XLT 2.9L V-6 5-Spd 4x4 'xplorer coils & leafs, MT/R 30x9.50s, 2 1/2" cat-back
-1989 Bronco II XLT 2.9L A4LD 4x4
-2004 Toyota Tacoma Xtracab SR5 3.4L V-6 5-Spd 4WD (K&N air, all else is bone stock!)
-1994 Chevy 2500 5.7L 5-speed
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  #19  
Old 02-03-2007, 08:41 PM
frankenbroncoII frankenbroncoII is offline
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just 1 question, why would you want to build up a 2.9L? would it not be more cost effective to go with a 4.0 and build it up. for the about the same money with bigger gains. just going with a 4.0 gives 30 hp alone over the 2.9. that is if your wanting to stay with a v6 class.. or for even bigger gains going 5.0 or larger v8. i know some do things just to be different and i get that. im that way myself from time to time. but sometimes it can just cost alot of cash to be different. i by no means am downing any one here. i was just courious.
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  #20  
Old 02-04-2007, 06:47 AM
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Because to do a 4.0L swap the right way, you're going to end up spending about the same amount of money as rebuilding a 2.9!
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  #21  
Old 02-05-2007, 10:19 AM
OSin86 OSin86 is offline
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Quote:
Originally Posted by kernel-panic
Because to do a 4.0L swap the right way, you're going to end up spending about the same amount of money as rebuilding a 2.9!
Same money and ahead with the 4.0, sounds like a good deal.
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  #22  
Old 02-05-2007, 11:40 AM
rusty70f100 rusty70f100 is offline
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Quote:
Originally Posted by dirtybroncoii
I Have a 2.8 block on an engine stand in my garage right now WITH a 4.0 crank in it. there is hardly any block indexing to do (for the crank)

Also 2.8 head intake runners wont line up with a 2.9 intake.
That's a 2.8L block. Must be a difference. This goes against everything I've seen and read on the subject.

OBTW, how much is it going to cost in dyno time to get the speed-density computer corrected with a 2.9L? I assume you'd do some changes in the rebuild, like cam, heads, etc.

Edit:
Is that a 4.0L crank in a 2.8L block with crank, rods, and pistons, or just the crank?

Last edited by rusty70f100; 02-05-2007 at 11:43 AM.
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  #23  
Old 02-05-2007, 10:18 PM
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Quote:
Originally Posted by OSin86
Same money and ahead with the 4.0, sounds like a good deal.
The 4.0 puts out 250+ HP stock?
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-1987 Bronco II XLT 2.9L V-6 5-Spd 4x4 'xplorer coils & leafs, MT/R 30x9.50s, 2 1/2" cat-back
-1989 Bronco II XLT 2.9L A4LD 4x4
-2004 Toyota Tacoma Xtracab SR5 3.4L V-6 5-Spd 4WD (K&N air, all else is bone stock!)
-1994 Chevy 2500 5.7L 5-speed
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  #24  
Old 02-05-2007, 10:37 PM
frankenbroncoII frankenbroncoII is offline
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stock 2.9 is 140hp 170 FTLBs of torque stock 4.0 OHV is 170 hp 200 FTLBs of torque.

i just see more totential gains from the 4.0 over the 2.9. not saying the 2.9 cant be built up, bc it has and can be. but for the money the 4.0 can give more on the long end than the 2.9 with out the design flaws, though 4.0 has its own problems as well.
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'86 ranger XL 4x4 2.9L FM-145 5 speed
'86 ranger XL 4x2 2.3L TK5 5 speed
'86 f150 lariat 4x4 5.0 Aod NP 208 - Sold
'89 T-Bird 3.8L Aod R.I.P. Blown head gasket @172k
'92 explorer XLT 4X4 4.0L (bored 30 over) A4LD Billet Grill
'96 explorer XLT 4x4 4.0L leather int. moon roof 6 disc cd changer
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  #25  
Old 02-05-2007, 10:47 PM
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Well, money-wise, mildly (re) building a 2.9 and doing a 4.0 -stock- engine swap is about the same, if you're going to do it right. The only detracting and limiting factor on the 2.9 buildup is getting a set of the "new" WP bare heads or complete heads ($600+ for a pair). The other thing is finding ... let's see... what years of the Ranger / Explorer for "the perfect donor" ... 90-92? I'd have to find that info. Otherwise... Yeah... good luck on that!

Also, even with a little (comparatively speaking) investment, you can boost the output of a 2.9 without dismantling the engine whatsoever... to at least if not over stock 4.0 numbers.
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-2004 Toyota Tacoma Xtracab SR5 3.4L V-6 5-Spd 4WD (K&N air, all else is bone stock!)
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  #26  
Old 02-06-2007, 06:03 PM
OSin86 OSin86 is offline
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Quote:
Originally Posted by kernel-panic
The 4.0 puts out 250+ HP stock?
LMAO, good luck getting 250+ HP out of a 2.9 without a boat load of cash!!! You'll spend WAY more on a 2.9 getting 250hp then you will out of a 4.0.
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  #27  
Old 02-06-2007, 07:15 PM
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Quote:
Originally Posted by OSin86
LMAO, good luck getting 250+ HP out of a 2.9 without a boat load of cash!!! You'll spend WAY more on a 2.9 getting 250hp then you will out of a 4.0.
I never said anything about getting 250hp out of a 2.9 i just mentioned getting it close to a stock 4.0l which is 200 hp plus the 4.0l have there own issues as well and if your gonna go 4.0l you might as well go 5.0l ho it only costs a little bit more than a 4.0l swap plus upgrades
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  #28  
Old 02-06-2007, 07:24 PM
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To me, I guess it depends on how you shop for certain parts. s/250/230, by the way. 24lb injectors and the right parts will get you to or close to 230hp, from either engine, under the right circumstances. Biggest $$$ ticket items would be the top end items (cam, heads, valvetrain), the right exhaust (including headers) and tsperformance chip. A lot of the costly things can be done by the do-it-yourselfer, i.e., porting and polishing, etc., if you have the tools / equipment (or access to them) and a lot of patience. I am sort of curious about 2.8 flat-top pistons working in a 2.9, though. I'm wondering if the tops of the pistons will need at least relief cuts so the valves don't get demolished. I'm also curious if you can run a 4.0 on a MAP system or a converted MAP system vice the stock 4.0 computer. I've seen MAF conversions and other various and sundry mods for the 2.9, including a 5.0 throttle body conversion.
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-1987 Bronco II XLT 2.9L V-6 5-Spd 4x4 'xplorer coils & leafs, MT/R 30x9.50s, 2 1/2" cat-back
-1989 Bronco II XLT 2.9L A4LD 4x4
-2004 Toyota Tacoma Xtracab SR5 3.4L V-6 5-Spd 4WD (K&N air, all else is bone stock!)
-1994 Chevy 2500 5.7L 5-speed
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  #29  
Old 02-07-2007, 06:00 PM
OSin86 OSin86 is offline
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Quote:
Originally Posted by cdncowboy
I never said anything about getting 250hp out of a 2.9 i just mentioned getting it close to a stock 4.0l which is 200 hp plus the 4.0l have there own issues as well and if your gonna go 4.0l you might as well go 5.0l ho it only costs a little bit more than a 4.0l swap plus upgrades
Wasn't really quoting you...................
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  #30  
Old 02-07-2007, 09:05 PM
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I didn't even see that post, after I had posted my last one. Too funny....
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-1987 Bronco II XLT 2.9L V-6 5-Spd 4x4 'xplorer coils & leafs, MT/R 30x9.50s, 2 1/2" cat-back
-1989 Bronco II XLT 2.9L A4LD 4x4
-2004 Toyota Tacoma Xtracab SR5 3.4L V-6 5-Spd 4WD (K&N air, all else is bone stock!)
-1994 Chevy 2500 5.7L 5-speed
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Old 02-07-2007, 09:05 PM
 
 
 
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