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#1
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Vtsuby's cylinder head development thread
I finally got the heads rigged up on the flow bench today. We have had issues calibrating the software for the bench but for an initial test I lifted the valves to .450" and saw 235cfm. Does anyone have anything to compare this to? I started adding some clay to the floor of the port building it up so far the cfm hasn't decreased. I'm flowing the heads without the velocity stack right now just with a clay donut. I suspect alot of the stack will fill in without effecting cfm with things the way they are now. The head has a nasty short side turn which is inhibiting flow at some level. By filling the floor in the port is being raised vertically making a smoother radius down to the valve decreasing the restriction. Another scenario would be its just dead right there. The pitot is also screwed up somewhere in the program and is preventing further investigation hopefully the bench will get sorted out tommorow. The over all plan is to increase the angle of the port and give the short side a much smother radius. The next thing I'am going to try is grinding the part of the combustion chamber near the valve back some to try to deshroud the valve a bit. I'll post some numbers and pictures when the bench is working properly
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#2
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Quote:
-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 |
#3
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so how much lift can we acheive with stock compnents without bottoming out the stock springs?? please make measurements in metric
Tom |
#4
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My fixture can't handle that pressure which would be the most convient way to answer that. I don't intend on using the springs.
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#5
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Good luck VT with that project, with your experience and tools I foresee you will be achieving the fastest N/A SVX...
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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. |
#6
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Gee, Tom, and why would you want to know this info? I'll see if my machinist can rig up a fixture to take this measurement. If we can't make something work, I'll see if I can't get a feeler gauge in between the coils while using the "upgraded" intake cam at max lift. -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 |
#7
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you could put spring in a compressor measure that subtract installed height then put retainer on valve with buket on top measure the displacement in the head and compare the difference which would bottom out first
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#8
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Fastest na impreza is my goal. I like the svx especially the room but its got 600 pound easy on the impreza.
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#9
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Quote:
-Bill
__________________
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 |
#10
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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. |
#11
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Just got back from business travel, so I'll see if we can't make some progress in the next week! -Bill
__________________
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 |
#12
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Quote:
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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. |
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