Senol
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GenII 3sge help
I'm getting this motor rebuilt and was thinking about raising the compression ratio slightly with the bigger cams + ecu etc. I've read that the the GEN3 N/A's have a higher compression ratio. Would the pistons out of this model fit into mine(im guessing yes)? Any increase in compression is good right  Also, I purchased uprated Brian Crower valve springs and titanium retainers. What would a safe maximum be to rev my gen2 3sge? its going to have cams with 270 duration and 9.2 lift. Still shim over bucket. 8000rpm.. am I dreaming?
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surok
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Re:GenII 3sge help
2011/04/19 10:46:48
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toss the shim over bucket setup away. just go shim less when you do the work.
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just_ace
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Re:GenII 3sge help
2011/04/19 11:54:55
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yes fit gen3 pistons,i think gen3 have a 10.3:1, it's a small increase but added with a thinner HG you'll bump it up more. dunno what size the stock HG for the NA is but if it's the same as the turbo i think they're 1.2mm. cometics are 0.8.
if you have another $300 odd you should b able to fit shimless buckets.
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Senol
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Re:GenII 3sge help
2011/04/19 13:05:02
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Thats good news about the pistons being compatible! anything helps..
So on the topic of shimless conversions im going to let the engine reconditioner install those parts. So I will have to talk to them about it.
Because im going shimless. Does this mean i should talk to CROW and get them to redesign the cam with much more lift? 9.6-9.8mm etc? Is the difference between 9.2mm and 9.6mm going to be felt?
300 odd dollars for peace of mind is worth it for me. Then i wont have to worry about flicking shims at just 8000rpm? Maybe even go a tadd further if the powerband permits.
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just_ace
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Re:GenII 3sge help
2011/04/19 17:52:56
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if you go shimless then get cams with 10.5-11mm lift.
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Senol
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Re:GenII 3sge help
2011/04/20 00:25:25
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ive just realised that if i do get that much lift i wont be able to run my rebuilt motor "in" on the factory ecu. Ill have to get a safe tune for it which adds to the tuning cost. so say instead of $500 for the full tune its going to be near twice that. Is it worth it for the extra hp? Im guessing it wont be massive gains.
Is it daft to get shimless buckets put in and only run smallish lift?
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Ricardo
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Re:GenII 3sge help
2011/04/20 06:14:31
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just_ace
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Re:GenII 3sge help
2011/04/20 12:21:49
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Senol
ive just realised that if i do get that much lift i wont be able to run my rebuilt motor "in" on the factory ecu. Ill have to get a safe tune for it which adds to the tuning cost. so say instead of $500 for the full tune its going to be near twice that. Is it worth it for the extra hp? Im guessing it wont be massive gains.
Is it daft to get shimless buckets put in and only run smallish lift?
what do you want to achieve? just a little more HP or do you wanna try and see what you can really get from a gen2? in all honesty you should buy the gen3 motor for sale, he only wants $600, that gets you an extra 20hp straight off the bat and it comes with shimunder buckets so you can run hilift cams, gen3 has bigger ports and runners and a 60mm TB and prob a more advanced ecu so it'll be able to run your motor with the cams until tuning, esp as you on't be revving the nuts of it. also better sump arrangement
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Senol
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Re:GenII 3sge help
2011/04/20 13:54:38
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I just want a motor with a little bit of character. I like the idea of a lope at idle and more revs.
i read on another forum that a gen 2 3sge user was able to clean up 150hp at the wheels with a 256 cam with 9mm lift and a tune. I know all dynos are different, but with the 270 and 9.2mm, should be able to get the ~160hp?
I don't want this build to turn into finding the limits of the GEN2 N/A. I was initially just going for a standard rebuild but i thought these bits and pieces would be worth it, just for a little bit more fun.
Im not keen on the engine conversion, because i want to start with a rebuilt motor.
Thanks ricardo that first link was a good read.
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just_ace
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Re:GenII 3sge help
2011/04/20 14:21:25
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then just stick with low lift 272 cams and stock shimover buckets.
the low lift is what stops the shims flicking out. rev to where ever it stops making power.
but if you do decide to go shimless you'd be a fool to stick with low lift cams.
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Senol
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Re:GenII 3sge help
2011/04/20 15:52:38
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alright then, i guess ill just stick with shim over buckets.
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just_ace
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Re:GenII 3sge help
2011/04/20 19:37:52
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if you've got a spare $300 you could throw a set of eagle rods in there. the stock rods are heavy.
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Senol
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Re:GenII 3sge help
2011/04/20 22:52:30
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done. they will be the same as the 3sgte ones right? and they are just a standard size.. as in they arent made in a range of sizes to accommodate a rebuild?
Wheres the best source to buy them from?
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Tree
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Re:GenII 3sge help
2011/04/21 00:29:08
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Apparently the 3SGEs can handle 8200 RPM with chip tuning/replacement. Check out the"Tech section" of the MR2 Club of Australia site. http://www.mr2club.com.au/ GL with the rebuild mate it's gonna be one hell of an angry MR2 
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just_ace
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Re:GenII 3sge help
2011/04/21 01:34:08
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Yeh, all 3s rods are the same size. Prob best place to get them.is from dylmrt/gorilla ind
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