2.2L VS. 2.5L Please! Help Me Decide On My Rebuild

[Bearcat]

I have to disagree there Ken, I had to change my clutch setup because of that a few years ago when I had my first engine rebuild. The engine was bored .30 over I think, this caused the clutch to start slipping toward a higher rpm(3500-4000) then I had to switch over to the TIII pressure plate. When I switched over from the bored out 2.2L to the 2.5L, on really cold mornings I'm starting to get that slipage again so I turned down the boost for winter months. but from what I have seen for myself, the extra 1-2 inches of piston space does have a small increase in torque, your moving more mass there and that only makes sense.

Mark

[glhsken]

Disagree all you want. Boring these motors is insignificant to increases in power. Just because a clutch slips is not an indicator. That could be caused by any # of things.

A 1psi increase in the boost will net you more power than boring a block .030" over.

The issue isn't if there IS any increase (it is logical to assume some). The issue is that it is insignificant in the grand scheme of things.

[turbovanman]

Quote:

Originally Posted by Bearcat The one that NOBODY has said is a 2.2L bored out .30 over.. :-) now you get the REV power and more torque too boot!

I agree with Ken, and it won't change how your engine revs out. Now .030 in a big block, that will make a difference but not on our little engines.

[Aries_Turbo]

I gotta 2.5 in a light car and even at 16psi it spins the piss out of the tires when the boost comes on... at the time I already had the JE forged pistons so I went through with the 2.5L build otherwise Id prolly have done a 2.2. I do have one thing to my advantage (sorta)... my TU 3" swingvalve sticks open a little and makes it a little laggy... Ill fix it in the spring but it keeps the boost from coming on too low and really roasting them. but i lose some high end cause of the 2.5... oh well, Ill just get some better tires and fix that swingvalve. I could also make a hybrid trans to help.

My 2.5 with no balance shafts does shake the car some but I have all filled mounts... Ill prolly mess around with mounts till I get some that are firm but dont shake.

Brian

[turbovanman]

Quote:

Originally Posted by Aries_Turbo My 2.5 with no balance shafts does shake the car some but I have all filled mounts... Ill prolly mess around with mounts till I get some that are firm but dont shake. Brian

Yeah, thats why I left them in on my 3rd engine, lol. Got tired of the steering column shaking with the a/c on. I didn't notice any difference in performance with them in. The van was smoother and the exhaust was quieter,

[Bearcat]

Quote:

Originally Posted by turbovanman I agree with Ken, and it won't change how your engine revs out. Now .030 in a big block, that will make a difference but not on our little engines.

It's not a point of "HOW the engine revs out" but the matter there is a small amount of power made over a stock 2.2L bore, your sucking in more air, possibly more fuel if added which means more force when this all mixes and egnites in the combustion camber. I don't expect some of you to agree on this and some will agree, I spoke my opinion and from I have seen, my clutch
was clean and had less than 10k on it when replaced.. no oil or greese caused the slipping, the extra displacement from the piston size was the cause. true about a Big Block..heck those things can rev up to 7000rpms and still make great power.. 426 Hemi forever the power house..

how if somebody can make a 2.5L rev freely to 6500-7200 rpms..

Cheers peoples..

Mark

[glhsken]

And 1 psi boost will still make more power than the "bore" job on the engine.

[Bearcat]

Quote:

Originally Posted by glhsken And 1 psi boost will still make more power than the "bore" job on the engine.

And I agree with you there my friend but anything extra is always welcomed , doncha think?

Mark

Hey email me in private, I need to talk to you about somethings coming up soon.

[glhsken]

No, I don't think... the implication was- Bore a 2.2L out and you'll magically get tons of extra torque. That's just flat wrong. Reading what you wrote might get someone to do just that and be disappointed that it's not 2.5L type low rpm grunt.

In reality, there is very little difference in the 2 power mills. Below 4000 the 2.5L is slightly ahead, above 4600 the 2.2L is ahead.

No time for side issues. busy month of December, H.S. Basketball and moving along with the holidays.

[Bearcat]

Quote:

Originally Posted by Bearcat The one that NOBODY has said is a 2.2L bored out .30 over.. :-) now you get the REV power and more torque too boot!

NOw to what Ken said "tons of more torque"

I never said tons of more boost I said :
"you get the REV power and more torque too boot"

that was taking a 2.2L from stock and increasing the bore for slight power
or "more" torque increase , I'm not telling people this is the way to go but another option of engine choices to use.

Mark

[glhsken]

Persistant aren't you. It's a waste of time. Bore it if you need to clean up the Cyl walls. Other than that FORGET it. Nothing worth talking about to be gained.

I never said tons of boost either, less than 1psi will net you more gains.

[Bearcat]

[I never said tons of boost either}

I know..the edit feature did not work like it should, then again with the phone ringing here and I'm going back and forth between the phone and computer.

I meant to say Tons of Torque quote... but I know what you meant and you know what I meant as well..no big deal there. :-)

Doing the Basketball coaching thing in Nky?

Mark

[moparinsane]

Just remember the golden rule...

There is no replacement for displacement.

[UltimateBaron]

Placement is a good replacement for displacement

[Turbo Charger]

Personally.. I don't see any point in using a 2.5 engine unless

A. You drag race and can use slicks.
B. You can afford Street Legal slicks every year or 2. (however long they last)

The 2.2 Already makes GOBS of torque and the only thing a 2.5 is going to do for you imo is make you spin more than the 2.2 already does.

All in all the 2.2 is the better choice for most people. We all know its better in the top end and what good is more torque that you can't use?