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Old 10-03-2007, 10:38 PM   #1 (permalink)
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sr20de 4 throttle

hi all,i got a sr20de lowport with highport inlet cam and quad throttles off a gtir adapted onto it,pistons are standard 10:1 flat tops
does anyone know if the head can be machined to raise the compression,and if so how much can be removed without running into problems?
im hoping to get at least 11:1?
or would i be better off to change over to sr16ve or vg30 pistons to raise the compression?
thanks very much in advance.
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Old 10-03-2007, 11:12 PM   #2 (permalink)
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P&P head + SR16 pistons + GTIR itb's + Calum Chipped ECU = All Motor Nice set-up
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Old 10-03-2007, 11:13 PM   #3 (permalink)
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just use sr16ve pistons it real easy.
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Old 10-04-2007, 12:54 AM   #4 (permalink)
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sr16 pistons will give you close to 12:1. but you deffinitly need to port and polish your head if you want to make any good power. stock srde heads dont flow well at all.
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Old 10-04-2007, 01:12 AM   #5 (permalink)
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^P&P is mainly good for TURBO though right? How many HP's would a P&P do on a BONE stock SR20DE motor with NO OTHER MODS just the P&P?
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Old 10-04-2007, 05:18 AM   #6 (permalink)
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Not much. You want a port job with cams,headers,exhaust, and intake to make them all work right. Porting is not mainly for turbo because porting for turbos are way different then porting for NA.
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Old 10-04-2007, 02:48 PM   #7 (permalink)
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The head can have 1mm removed, Dave Bull and others have done it, but you will need cam gears and an N1 chain tensioner.

Mike
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Old 10-04-2007, 03:16 PM   #8 (permalink)
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The head can have 1mm removed, Dave Bull and others have done it, but you will need cam gears and an N1 chain tensioner.

Mike
cool,this is the prefered option,what sort of c/r can i expect by taking 1mm off the head?
i shoul have listed the other mods i guess
link ecu
custom 4into1 headers
thanks for the input thus far
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Old 10-04-2007, 03:19 PM   #9 (permalink)
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The head can have 1mm removed, Dave Bull and others have done it, but you will need cam gears and an N1 chain tensioner.

Mike
I had 1.2mm removed from the head Mike, and just used the stock RR chain tensioner.

Cheers

Dave
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Old 10-04-2007, 04:48 PM   #10 (permalink)
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Not much. You want a port job with cams,headers,exhaust, and intake to make them all work right. Porting is not mainly for turbo because porting for turbos are way different then porting for NA.
^Three angle valve jobs are for turbo.........Then what kind of P&P would be best for all motor? I ask bc you say that the air flow is different between the two. Which I agree, but wouldn't that be because of the HIGH FLOW work action of the turbo? The aire would still travel the same through the INTAKE MANIFOLD, just at a HIGHER SPEED........
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Old 10-04-2007, 05:57 PM   #11 (permalink)
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The air is at a higher pressure in the turbo inlet, it doesnt rely so much on the piston vacuum, so you can hog the ports out bigger for a higher flow and not care quite so much about the velocity.

Mike
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Old 10-04-2007, 06:55 PM   #12 (permalink)
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Quote:
Originally Posted by MR-4Door-SR20DE View Post
^Three angle valve jobs are for turbo.........Then what kind of P&P would be best for all motor? I ask bc you say that the air flow is different between the two. Which I agree, but wouldn't that be because of the HIGH FLOW work action of the turbo? The aire would still travel the same through the INTAKE MANIFOLD, just at a HIGHER SPEED........
you want a 3 angle vallvejob regardless if it were turbo or na. Like what mike said...with air being pushed in insteal of sucked in, turbo porting needs more work on teh Exhaust side. WHen porting for NA, you want to get as much Velocity as you can...its not just a matter of making the ports bigger.
Ill be posting pics of my head tomarrow when i goto DPR and get slowcharts as well. Ill further explain the differences of teh two ports when i get pix in.

Last edited by zerogravity; 10-04-2007 at 06:57 PM.
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Old 10-05-2007, 02:15 AM   #13 (permalink)
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^Thanks for the reply...........can't wait to see the pics.
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Old 10-07-2007, 07:57 PM   #14 (permalink)
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send pics 2 check out the workmemship and looking 2 do the same in theny area
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Old 10-07-2007, 09:43 PM   #15 (permalink)
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yes zerogravity post pic.z
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Old 10-07-2007, 09:44 PM   #16 (permalink)
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have not gotten a chance to stop by, probably tomarrow or tuesday for sure. I been running around doing other things.
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Old 11-06-2007, 02:53 PM   #17 (permalink)
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ok,,,the cam journals have been polished, head has been deburred, now all im waiting on is the port job and valve job.




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Old 11-06-2007, 03:50 PM   #18 (permalink)
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cool,this is the prefered option,what sort of c/r can i expect by taking 1mm off the head?
i shoul have listed the other mods i guess
link ecu
custom 4into1 headers
thanks for the input thus far
By my measurements, 1mm removed from the head will reduce the chamber volume by 5.36cc, you need to do YOUR sums for the gasket, final deck height and any other changes you make factored in to give you your final CR.
BUT with a bone stock engine, flat-top piston, it will raise the cr from 10:1 to just over 11:1.

Mike
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Old 12-03-2007, 10:28 PM   #19 (permalink)
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the gti-r itb does not give any power gain on a NA motor, it just gave throttle responce, when i went from the jdm intake manfold to the gti-r all i got was alot more crisp throttle responce but my car was slower
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Old 12-21-2007, 03:46 AM   #20 (permalink)
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Do you have any dyno numbers to prove this? Reason why im asking, i drove my buddy's Ve which is 190whp and my car is a De with 154whp. Mine "feels" faster but dyno says other wise. I would think the GTiR ITB's would give some hp gain...but with no dyno's..it is hard to make that assumption.
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