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Old 05-07-2006, 10:05 PM   #1
gc835
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Default na sohc build up

ive been tossing a few ideas about building up the na engine in my 01 rs. i would be looking to make about 250+ whp with a 8000 rpm limit. i know i know for the $$ wht not go turbo but i have 2 other cars that are turbo and you have to admit that 8000 rpm na subie would be pretty cool. i would replace the block, if needed??, pistons up the cr, rods and crank. would like a long stroke. i would use the sohc heads but get them p+p cams,springs ret, etc. and i would probably run it all on a hydra. i would be beating this thing pretty hard and would want the highest cr possible for 93 octane.would the stock block be ok?? what crank and rods?? any and all ideas and opinions wanted
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Old 05-07-2006, 10:17 PM   #2
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build some ITB's
there are a few fuel injected snowmobiles or jet skis 2cyl that would work, or you could split a set of 4cyl bike ITB's from a busa or the like. busa bodies are like 46mm. they have a TPS on em too.
think of how bad ass that would sound and the crazy throttle response!!! get some sweet velocity stacks too.

these would be perfect, look how they split apart.

http://cgi.ebay.com/ebaymotors/2005-...QQcmdZViewItem
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Old 05-07-2006, 11:04 PM   #3
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me and my boy where discssing that the only thing was tps and throttle linkage
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Old 05-08-2006, 01:19 AM   #4
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ITB's being done --> http://forums.nasioc.com/forums/showthread.php?t=961467


You'll want to worry less about the block/motor and more about the heads. In an NA motor, the power is ALL about air delivery.
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Old 05-08-2006, 02:59 AM   #5
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I would be more concerned about manifolds, throttle linkage is simple to make and all EFI bikes have a TPS. or I bet you could even adapt the stock one.
of course this kind of **** takes some doing.
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Old 05-08-2006, 03:39 AM   #6
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While you're at it...use the EM for the injected bikes.....Crazy stuff! I love it!!!!
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Old 05-08-2006, 12:34 PM   #7
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If you pull it off, you will be the first person to do it. Zzyzx'z car put down something like 230whp on a dyno that had stock STi's at the same whp. But then maybe if you get a more "friendly" dyno you can pull it off. Search prooven power for Zzyzx's build and story...
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Old 05-10-2006, 11:09 AM   #8
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well i was thinking maybe picking up a 257 block with nothing in it a filling with the proper stuff. having it balanced to like 10k just to be safe. then getting the heads done to the extreme and put a pretty beeefy set of cams in it with springs , ret. run the stock intake man with a tb spacer and a ported tb. and tune it for 93 and see what i get and go from there. i just got another set of empty sohc heads so im gonna send them out to either cosworth or ??? suggestions welcome. right now im waiting for a clutch to install my 6 speed and 180
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Old 05-11-2006, 05:22 PM   #9
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http://www.techworkseng.com/Packages...e_Packages.htm
2.35L screamer short block (N/A) for the bottom end.
plus,
http://www.techworkseng.com/Packages...d_Packages.htm
stage II heads for the top end.

perfect power 6 or equivalent EM, WRX injectors and fuel pump, plus modified fuel rails to work with the injectors.
Already had this discussion with a previous employee of TWE, as well as Sam @xccelleration.com about the same setup for my car. I went with the heads for now, but am drooling over the de-stroked shortblock. Shortening the stroke will create a more rev-happy rod/stroke ratio. So, even though the displacement will go down, there will still be lots of power. when you want to go to 8000 rpm, you will most certainly have to give up some low end to get there.
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Old 05-11-2006, 10:45 PM   #10
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awsome stufff thanks
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Old 05-17-2006, 05:22 PM   #11
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bump!!!
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Old 05-21-2006, 08:38 AM   #12
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I have a set of TWE valve springs and ret 4 sale.
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Old 05-21-2006, 03:57 PM   #13
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If your trying to stay N/A and get that kinda power. Why not go even more exotic and build an N/A EZ30-R or EG33?
Seems like a stock one would be closer to your goals, even in stock form. Granted it won't rev to 8k but you should be able to extract 250whp from it.
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Old 05-22-2006, 04:11 PM   #14
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mmmmmmmm ive just started to research this
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Old 05-23-2006, 11:26 PM   #15
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Old 06-08-2006, 09:31 AM   #16
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gc835.....You read my pm's and dont respond it has been 2 weeks......have you shipped my utec yet?!?
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Old 06-08-2006, 11:27 AM   #17
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The 257 block in my opinion would be a necessary upgrade for 8k rpms. I just don't see the cylinder staying in place for a very long time at that rpm on a fully open deck 25. Especially with high compression.

Or you could consider a super high compression 22t turbo block thats been stroked. O-ring, Head Studes and run a good mixture of methanol or ethanol and you should be able to bump compression up above 11:1.
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