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#16
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Well, I actually found some time to get to my machinist's shop and got the answers to #2 and #3 above (totally phased about #1 I'll probably get this measurement in the next week...) The clearance between the intake cam lobe and the rim of the lifter bore (using the Delta Cam intake.....oops, is this mike on? ) is greater than .032 inches (~.86mm). The feeler gauge kit we were using maxed out at .032 and it was time to leave so we didn't measure exactly how much clearance there is. There was definitely more room to play with and you can get even more if you just radiused the lobe a little... As far as lift to coil bind is concerned, we first did a calculation using measurements on the intake valve we've removed (getting ready for some flow work ) and we came up with 0.419 inches (10.63 mm) of lift when the spring binds. We then rigged the head up on a drill press (squaring the valves with the plunger on the press and instrumenting the press with a dial gage). I've included the measurements we got in the picture below. Enjoy! -Bill oh, and here's a little "teaser"
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#17
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Thanks Bill! To summarize, the intake valve spring coil binds at about 9.9 mm of valve lift, but the intake cam lobe will hit the rim of lifter bore when the lift is set to more than about 8.9 mm lift. So, it looks like the max intake valve lift without doing any machining to the cylinder heads is about 8.8 mm.
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Mychailo :: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ :: 1995 Laguna Blue SVX L AWD 5MT (sold) Visit my locker SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads. |
#18
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Quote:
That's probably safe. -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#19
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More lift.?
It would be easier to cut the edge of the lifter well away, than radius the cam.
You can get more lift by reducing the base circle of the cam profile. The lifter will pump up about 0.75mm, you could rely on at least, 0.50mm more. But I don't think the motor could use more that 9mm. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#20
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While my machinist mentioned both options, he did say cutting the edge of the lifter well would be the easiest... Question for you -- how much additional lift do you think the EG33 exhaust cam can really benefit from (given that one is running the increased lift intake cams)? -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#21
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Need some more measurements Bill, or anybody that can supply them. The inlet/exhaust valve throat dia. at the valve seat. The dia. of the inlet runner at the injector stack joint. The length of the inlet/exhaust port, from the center of the valve to the face of the head. Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#22
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Retainer to valve seal clearance measurements:
.450" intake .455" exhaust. For Harvey's model: Intake throat 1.220" diameter, 1.060" exhaust throat diameter. Measured with dial calipers.
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#23
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Quote:
Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#24
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Actually, it seems that the valves had a generous 60* cut below the seat before the straight throat cut. I cleaned up the little bit of casting and blended it into the throat cut. I didn't enlarge into the area of the 60* cut.
The seats were not that wide as I recall, the difference to the valve diameter is due to the angle below the valve seat. I'll estimate the seat width next trip. Quote:
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#25
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What is the optimal ratio of valve throat to valve diameter? 90% intake?
I measured 86% on the intake and 84% on the exhaust. The intake seats are fairly narrow. The throats could be enlarged slightly by reducing the 60* angle cut.
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Special Thanks to Our Friends and Sponsors: * http://www.alcyone.org.uk/ssm http://www.PhenixWheels.com http://www.dba.com.au/ http://www.ClassicSoftTrim.com http://ToyoTires.com/tire/pattern/versado-lx Gillman Subaru of Houston "QuickChange" http://www.TransGo.com/ http://www.PlanetSVX.com Bontrager Works, '92 Subaru SVX LS-L Claret ORIGINAL OWNER '92 LS-L Pearl~ '92 LS Pearl~ '92 LS-L Teal~ '92 LS-L Silver~ '95 LSi Polo~ '92 JDM Alcyone SVX Version-L 4WS Pearl~ http://www.subaru-svx.net/forum/showthread.php?t=54143 '92 JDM Alcyone SVX Version-L 4WS Ebony~ http://www.subaru-svx.net/forum/showthread.php?t=54117 |
#26
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Seems to me I read somewhere recently that the optimal ratio is 70%, but this might have been for 2 valve heads (vs our 4 valve heads) -Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#27
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Web Cams lobes
Delta in Tacoma, WA charges $300 to weld and grind two cams. Web Cams in Riverside, CA charges $650 to weld and grind two cams. The cost of living in Southern California is reflected in the price.
The WC lobes are Web Cam lobes, compared to stock spec SVX lobes. Cam Lobe Duration .006"/ .010/ .020/ .050/ .100/ .200/ .250/ .300 SVX-Intake.. [.280"]: 236*/219*/206*/184*/163*/108*/66*/ WC-610....... [.312"]: 224*/218*/206*/188*/164*/116*/86*/ 40* SVX-Exh...... [.311"]: 244*/226*/214*/194*/172*/122*/90*/ WC-505 [9MM/.352"]: 234*/230*/220*/200*/176*/134*/108*/ 76*
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#28
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Harvey, we don't have any flow data, other than VTsuby's thread that max flow in the stock intake port is @ .425" lift/ 10.7mm. VTSuby posted intake flow of 235 cfm @ .450".
Why wouldn't the engine prefer more than 9mm lift? I posted the WC lobe spec, 9mm. Quote:
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Special Thanks to Our Friends and Sponsors: * http://www.alcyone.org.uk/ssm http://www.PhenixWheels.com http://www.dba.com.au/ http://www.ClassicSoftTrim.com http://ToyoTires.com/tire/pattern/versado-lx Gillman Subaru of Houston "QuickChange" http://www.TransGo.com/ http://www.PlanetSVX.com Bontrager Works, '92 Subaru SVX LS-L Claret ORIGINAL OWNER '92 LS-L Pearl~ '92 LS Pearl~ '92 LS-L Teal~ '92 LS-L Silver~ '95 LSi Polo~ '92 JDM Alcyone SVX Version-L 4WS Pearl~ http://www.subaru-svx.net/forum/showthread.php?t=54143 '92 JDM Alcyone SVX Version-L 4WS Ebony~ http://www.subaru-svx.net/forum/showthread.php?t=54117 Last edited by NeedForSpeed; 02-11-2006 at 02:33 PM. |
#29
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Harvey,
Regarding the port length, I could bend some wire through the center of the port to the head face and measure, is that what you want? The inlet runner diameter is not consistant, are you looking for a measurement of the area? Or should someone fill an intake port and record the volume? What do you need? Quote:
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Special Thanks to Our Friends and Sponsors: * http://www.alcyone.org.uk/ssm http://www.PhenixWheels.com http://www.dba.com.au/ http://www.ClassicSoftTrim.com http://ToyoTires.com/tire/pattern/versado-lx Gillman Subaru of Houston "QuickChange" http://www.TransGo.com/ http://www.PlanetSVX.com Bontrager Works, '92 Subaru SVX LS-L Claret ORIGINAL OWNER '92 LS-L Pearl~ '92 LS Pearl~ '92 LS-L Teal~ '92 LS-L Silver~ '95 LSi Polo~ '92 JDM Alcyone SVX Version-L 4WS Pearl~ http://www.subaru-svx.net/forum/showthread.php?t=54143 '92 JDM Alcyone SVX Version-L 4WS Ebony~ http://www.subaru-svx.net/forum/showthread.php?t=54117 |
#30
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Harvey,
I would guess that the intake throat could be opened to 32.4mm/1.275". That's 90% of the intake valve diameter of 36mm. Leaving 2mm for the valve seat on each side leaves a throat diameter of 32mm/1.260". That should be easy enough. Quote:
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Special Thanks to Our Friends and Sponsors: * http://www.alcyone.org.uk/ssm http://www.PhenixWheels.com http://www.dba.com.au/ http://www.ClassicSoftTrim.com http://ToyoTires.com/tire/pattern/versado-lx Gillman Subaru of Houston "QuickChange" http://www.TransGo.com/ http://www.PlanetSVX.com Bontrager Works, '92 Subaru SVX LS-L Claret ORIGINAL OWNER '92 LS-L Pearl~ '92 LS Pearl~ '92 LS-L Teal~ '92 LS-L Silver~ '95 LSi Polo~ '92 JDM Alcyone SVX Version-L 4WS Pearl~ http://www.subaru-svx.net/forum/showthread.php?t=54143 '92 JDM Alcyone SVX Version-L 4WS Ebony~ http://www.subaru-svx.net/forum/showthread.php?t=54117 |
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