To state the obvious, I'm new to this board.......Good ole post #1 right here. 
Anyway, I've read up on a lot of forums but haven't found many people with built 2.5i. Everyone goes for 2.7i, 2.8i, or more. How come, is the extra $$ for that extra .2L worth it?
I am interested in building up the 2.5i I have. I have a 110K mile M20 that's do for a Timing Belt change very soon. I've also found while looking through the oil fill cap that I have the break-prone head bolts. This seem to make it a keen time to do the work I'm desiring to on my engine. 8)
As I said, I'm looking to build up the M20. The bottom end is fine and great, so why mess with it? (Unless a stroker is really a great use of $$$) To obtain good performance I am willing to remove my engine to deck the block, but not really wanting to open it up. Someone informed me that I can deck the block and mill the head a lil to obtain a 9.5:1 CR. This is much more cost-effective it seems than buying custom 9.7:1 pistons. Should I look to raise the CR even more, or is 9.5:1 a good, safe #?
Along with the raised compression, I also want a hotter cam. I've read many different opinions on cams in the m20, but am favoriting either the 272 or a 282/272 cam. What would one suggest for lift? Piper cams use 10.44mm or 10.66, while some opt for 11.5mm. I don't want to put too much stress on the valve springs, so maybe I'll go for 11mm or so. To what degree of advantage is a port/polish job on the M20 head?
I understand headers, extrude hone, and larger throttle bodies are not really that helpful for a non-3.0L m20.....so I shouldn't give them another second of my time, right?
Exhaust, mostly likely Stromung or IE, and intake - either stock or heatshielded K&N. I'm also very intrigued by the SMT6/MAF mod. I think that a custom-tuned chip is the only way I can extract the potential HP from this setup.
Any other suggestions/comments?
Anyway, I've read up on a lot of forums but haven't found many people with built 2.5i. Everyone goes for 2.7i, 2.8i, or more. How come, is the extra $$ for that extra .2L worth it?
I am interested in building up the 2.5i I have. I have a 110K mile M20 that's do for a Timing Belt change very soon. I've also found while looking through the oil fill cap that I have the break-prone head bolts. This seem to make it a keen time to do the work I'm desiring to on my engine. 8)
As I said, I'm looking to build up the M20. The bottom end is fine and great, so why mess with it? (Unless a stroker is really a great use of $$$) To obtain good performance I am willing to remove my engine to deck the block, but not really wanting to open it up. Someone informed me that I can deck the block and mill the head a lil to obtain a 9.5:1 CR. This is much more cost-effective it seems than buying custom 9.7:1 pistons. Should I look to raise the CR even more, or is 9.5:1 a good, safe #?
Along with the raised compression, I also want a hotter cam. I've read many different opinions on cams in the m20, but am favoriting either the 272 or a 282/272 cam. What would one suggest for lift? Piper cams use 10.44mm or 10.66, while some opt for 11.5mm. I don't want to put too much stress on the valve springs, so maybe I'll go for 11mm or so. To what degree of advantage is a port/polish job on the M20 head?
I understand headers, extrude hone, and larger throttle bodies are not really that helpful for a non-3.0L m20.....so I shouldn't give them another second of my time, right?
Exhaust, mostly likely Stromung or IE, and intake - either stock or heatshielded K&N. I'm also very intrigued by the SMT6/MAF mod. I think that a custom-tuned chip is the only way I can extract the potential HP from this setup.
Any other suggestions/comments?
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