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| Subject: need guidance | |
Author: ACR2NV | [ Next Thread |
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] Date Posted: 19:12:42 01/12/03 Sun i dunno if i want to stay 2.2 or go 2.5...help! [ Next Thread | Previous Thread | Next Message | Previous Message ] |
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Author: tonyz2897 [ Edit | View ] |
Date Posted: 19:54:56 01/12/03 Sun Hmm... The 2.5 would make massive torque, but wouldn't rev as high, and the 2.2 would rev like a bandit at the expense of some torque. It's a tough choice. Gary's running a 2.5 in Relentless though isn't he? Just some food for thought. Tony [ Post a Reply to This Message ] |
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Author: mpbiv [ Edit | View ] |
Date Posted: 20:04:46 01/12/03 Sun I think you have to set forth a few goals first. Do you really want a whole bunch of torque? Looking to build an all out race car? Looking to break 300hp? Its going to come down to your preference anyways. [ Post a Reply to This Message ] |
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Author: TurboXT [ Edit | View ] |
Date Posted: 20:49:50 01/12/03 Sun whats wrong w/ alot of torque? [ Post a Reply to This Message ] |
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Author: mpbiv [ Edit | View ] |
Date Posted: 21:35:27 01/12/03 Sun I never said there is anything wrong with it. The way I see it you should have more than enough torque with a 2.2. Sure the 2.5 makes a lot more torque but the 2.2 is not a Honda either. [ Post a Reply to This Message ] |
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Author: tonyz2897 [ Edit | View ] |
Date Posted: 22:16:32 01/12/03 Sun Right, and while masive ammounts of torque help get a heavy car moving off of the line, it can make a lighter car wheelspin like crazy, which is fun on the street, but probably not too good for dragstrip launches unless you have the ability to put it to the ground... Tony [ Post a Reply to This Message ] |
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Author: TurboXT [ Edit | View ] |
Date Posted: 22:57:52 01/12/03 Sun i like the idea of alot of TQ, but i think if i ever get around to building a TII its gonna be the traditional 2.2 Litre if you know what i mean :D [ Post a Reply to This Message ] |
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Author: squirrel [ Edit | View ] |
Date Posted: 06:14:16 01/23/03 Thu I run a 2.2L in my SC and it is JUUUUUST FINE! 2.2s are a little better, reving higher, they do lose a little torque but with 337wfpt before I broke mine I think that's plenty. 2.5 pistons have a smaller skirt too so the pistons aren't as stout as a 2.2 I would say if the car is set up for a 2.2 no need to change it now. Mine is just fine the way she is and I have no intentions of going 2.5 any time soon. [ Post a Reply to This Message ] |
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Author: tonyz2897 [ Edit | View ] |
Date Posted: 12:00:33 01/23/03 Thu Personally I think it's just a matter of flow. The 2.5 could be a screamer, but the 8 valve heads barely flow enough for a 2.2. My car came with a 2.5, and I'm out of money so I'll just keep short shifting and enjoying the torque. :-) Tony [ Post a Reply to This Message ] |
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Author: BadAndy [ Edit | View ] |
Date Posted: 22:07:24 01/31/03 Fri Believe it or not I think it may actually be more crucial for a smaller displacement motor to have a well breathing cylinder head that one that is larger (when comparing the two).....reason being is the smaller motor has the mechanical ability to turn more RPM....it just needs the flow/volume to do so. The larger displacement motor cannot turn as high a RPM as the smaller motor but yet pumps more air early due to the increased cylinder volume.......well within the flow ability of our pathetic heads as it is at such a low RPM.....this is where the excellent torque numbers on a 2.5 come from. IMO the 2.5 is the best warmed over stock motor between the two....it's displacement works well with the flow characteristics of a stock type head. [ Post a Reply to This Message ] |
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Author: squierrel [ Edit | View ] |
Date Posted: 06:16:20 01/23/03 Thu No I didn't mean to say 2.2s are better than 2.5s I just meant they rev higher typically. No way to edit posts though. [ Post a Reply to This Message ] |
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Author: mpbiv [ Edit | View ] |
Date Posted: 06:56:00 01/23/03 Thu Well its all a matter of opinion anyways so if someone disagrees with you it doesn't matter. Me honestly, I am on the fence with this one. I think the 2.2 would be the better all around performer for someone looking to build a street/strip car. However at the same time I would like to put a 2.5 in my car, but I'll be using an auto. [ Post a Reply to This Message ] |
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Author: tonyz2897 [ Edit | View ] |
Date Posted: 02:28:05 02/01/03 Sat Ok, somebody correct me if I'm thinking this through the wrong way. The 2.5's have a longer stroke right? Having a longer stroke would increase the inertia and the distance the piston travels for every revolution of the crankshaft. This would cause more stress on the crank and wear on the rings at higher rpms, but wear issues aside, what else would limit the ability of the 2.5 to make usable power in the upper rpm range? A 2.5 spinning at 6 grand is going to be moving a bit more air than a 2.2 at the same speed, so I can't help but see it as a matter of flow. If the intake, head, exhaust, and cam profile on a 2.5 were modified/chosen to optimize flow in the upper rpms, and the rotating assembly balanced, wouldn't it be possible to build a good high rpm engine out of one? I'm not trying to start any arguements here, I'm just curious to see what everybody's reasoning is behind their opinions, and hopefully learn something in the process. Tony [ Post a Reply to This Message ] |