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#1
03-16-2006, 07:29 PM
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high compression via a milled head?
I was watching a show on SPEED channel over spring break and saw someone mill off part of the bottom of the head. They then coupled this to the block with a copper head gasket. This supposedly raised the compression of the motor sightly without the pain of changing out pistons. Is this a feasible idea for an SVX even if it's just getting slightly higher compression?
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Former: 1994 Barcelona Red(x2), 1995 Brilliant Red, 1992 Liquid Silver, 1992 Ebony(x2), 1992 Pearl White (x2) Current: 2017 Ford Raptor 2017 Kawasaki KLR 1995 Guards Red Carrera 1995 Spec-ish Miata - track car 1957 CJ-5 
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#2
03-16-2006, 08:12 PM
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Bore, 3.815", = SA of 11.430851 sq/in
11.430851 X 0.050=0.5715425 cid 202 cid engine cid, 10 to 1 compression ratio gives 20.2 cid head volume. 0.5715425 X 6 (cylinders)= 3.429255 cid is the volume decrese. 20.2- 3.42955=16.7045 cid head volume gives 12.063302 This represents the compression ratio of an engine cut, or machined the thickness of 17 sheets of newspaper. Tomorrow, when I am fresh, I will check these figures. 
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www.svxfiles.com The first SuperCharged SVX,  the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway  Fiberglass Hood thread My locker 4.44 Swap link
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#3
03-16-2006, 08:38 PM
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Uh oh...I see math class all over again.
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R.I.P Cool Signature. You're gone but not forgotten. I mean, sure, I kindof don't remember some of the finer details..but I remember you were funny, and at one point you said spaghetti in Dutch....but definantly not forgotten
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#4
03-17-2006, 07:35 AM
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10 to 1 compression ratio, 202.46 cid
20.246 cid in head. Max head shaving allowed by Subaru; 0.012” Max block shaving allowed by Subaru; 0.016” Total of allowed displacement removal1.9203828 cid 20.246 minus 1.9203828 = 18.325618 head volume. Compression ratio is now 11.047922 to 1 It still sounds like that is too much change for the little removed.  And retard the cam timing slightly, less than one degree.
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link Last edited by svxfiles; 03-17-2006 at 07:58 AM.
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#5
03-17-2006, 07:44 AM
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Quote:
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Danny 1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon) 1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration  2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection.
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#6
03-17-2006, 07:59 AM
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Quote:
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link
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#7
03-17-2006, 08:10 AM
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can there be a way to estimate any HP gains when pushing the compression up to 11:1? Is this still a possibility to be done in correlation with the deltacams increase in duration but without any increase in lift? I have reached a point where I need to decide what route I'm going to go with my car. I'm 98% sure that it will be N/A at this point, but still thinking.
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Former: 1994 Barcelona Red(x2), 1995 Brilliant Red, 1992 Liquid Silver, 1992 Ebony(x2), 1992 Pearl White (x2) Current: 2017 Ford Raptor 2017 Kawasaki KLR 1995 Guards Red Carrera 1995 Spec-ish Miata - track car 1957 CJ-5
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#8
03-17-2006, 09:11 AM
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0.028 inches is only 0.7mm. Would that be enough clearance reduction to cause a problem with the 1mm lift increase on the Delta cams?
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____________________________________________ 95 LS-i Red, 31,xxx; bone stock for now; Daily Driver 94 LS-i Emerald Pearl, 106,xxx,; 246 whp; Tomyx snorkus and HKS Cold air intake; PWR aluminum radiator, silicone hoses; Inline thermostat; enhanced coolant routing; external power steering and oil coolers; Phenolic intake manifold spacers; 2004 WRX 5 speed transmission; ACT Clutch Kit, Heavy Duty Pressure Plate, Lightweight flywheel, performance disc; Group N motor mounts; ‘07 WRX 4-pot front calipers, cryo-treated slotted Tribeca rotors; Hawk HPS ferro-carbon pads; Frozenrotor rear slotted rotors; SS brake lines, Axxis Ultimate pads; Rota Torque 17x8 wheels; 245/40-17 Bridgestone RE01-R's; Koni inserts with Ground Control coilovers, Eibach springs; K-Mac camber/caster adjustable strut mounts; Urethane swaybar bushings; Bontrager rear sway bar; Urethane differential bushing; Custom Whiteline adjustable rear lateral links; Outlaw Engineering forged underdrive pulley; custom grind Web intake and exhaust cams (11 mm lift, 250° duration); solid lifters; CP custom aluminum forged 11 to 1 pistons, Brian Crower coated SS intake & exhaust valves; Brian Crower upgraded springs w/ titanium retainers; NGK sparkplugs; RallyBob (Bob Legere) ported and polished cylinder heads; Eagle H-beam rods; ACL Bearings; Cometic Head gaskets; ARP head studs & fasteners; Hydra Nemesis EMS; Wideband O2 sensor; 740cc Injectors; Walbro 255lph fuel pump; Upgraded WRX starter; Equal length SS headers (3 into 1); dual Magnaflow cat converters; 2 into 1 into 2 SS exhaust with Bullet muffler; OT Fiberglass hood; Oil pressure gauge; Programmable shift light, 2017 Subaru Forester XT, metallic dark gray, 29,xxx 2005 Porsche 911 Turbo S Cabrio, 24,xxx 2006 Subaru Outback LL Bean, 166,xxx sold 92 LSL Dark Teal, Smallcar Shift Kit - sold
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#9
03-17-2006, 09:22 AM
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Quote:
According to research by SVXRide, Mychailo, NeedForSpeed and Harvey, the limit for intake cam lift is about 8.9 mm.(limit against coil bind) With the 8mm lift cams, and shaved heads everything should still clear. However, Chi ke has shown us links saying a bump in compression is not that important above 10 to 1 ratios. My own experience, has been with lower compression motors going up to 10 to 1, and those results were very satisfying.
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link
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#10
03-17-2006, 09:57 AM
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Quote:
http://www.subaru-svx.net/forum/showthread.php?t=28552 -Chike
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"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold)
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#11
03-17-2006, 04:34 PM
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hmmm...... So this is is not sounding as promising as I hoped.
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Former: 1994 Barcelona Red(x2), 1995 Brilliant Red, 1992 Liquid Silver, 1992 Ebony(x2), 1992 Pearl White (x2) Current: 2017 Ford Raptor 2017 Kawasaki KLR 1995 Guards Red Carrera 1995 Spec-ish Miata - track car 1957 CJ-5
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#13
03-19-2006, 12:20 PM
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Umm.... kemo sabbies...
Would the rather exact length of the intake manifold not be an issue here? I mean, we are talking about very small distances here, so I don't know, but it seems to me the the intake ant couldn't bolt up any more.
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Patrick 1995 Ebony Pearl. S.N. 0001 "Araby" JDM Power Mode Switch, Integrated GPS/Video Player 6Xk Miles. 1992 Teal - Sold to Mysvxrocks [SIGPIC][/SIGPIC]
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