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#16
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i could swear that the pitsons were steel. i thought i had a crack in my block early this year so i did a lot of research because someone said cast engines cant be repaired, yet forged ones can, and i remember being relieved at finding everything was forged. also i didnt have a cracked block. but coming from me its just hearsay. i dont usually expect to have to PROVE anything.
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
#17
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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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hence the term "all alluminum flat-6"
phil
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~Phil Teal 1992 Subaru SVX Turbo - Sold in May 2011 to peace-frog. |
#19
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i never heard the term.
whats a cylinder liner?
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
#20
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Nik,
Think of a metal can with both ends cut out that has been press fit down into each aluminum cylinder. Fairly common with aluminum block engines, as they provide a harder surface for the piston rings to run/seal against. I think the Cogsworth aluminum 4 cylinder may have run without steel liners...then again, Chevy put it in Vegas =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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data logged.
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
#22
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I need some specialized tools for further dis-assembly of the short block. I need more $$$ to buy those tools, and that's the issue right now. I've got a block that SVX10 helped me disassamble this summer. Not much left on it/in it other than rods, pistons, and crank. I spent time reviewing my SVX document library this weekend and looking at cutaway pictures of the EG33. MOST show the connecting rods as having large parting lines indicative of the forging process. SOME show a thinner parting line indicative of the casting process. Nowhere could I find a statement detailing the construction method of the rods. The crank is forged according to the FHI and SOA literature I have. Todd
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Down to none |
#23
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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. |
#24
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Todd,
Specialized tools ? Other than a piston ring compressor, I don't remember ever having to buy any specialized tools when I rebuilt my small block chevy engine -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 |
#25
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Does this mean I win the "are they cast or forged?" pool? I figured maybe cost would rear its ugly head somewhere in the engine. Go figure...10:1 compression and they run cast pistons -B
__________________
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 |
#26
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BTW-I've still got my ring compressor from when I re-built my 327 Chebby small-block back in 1987, Bill.
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Down to none |
#27
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The cast pistons are not a project stopper. It will just require more aggresive techniques for keeping the cylinder temps down. Water injection with an intercooler (and a stand-alone ecu) will be the key to a reliable motor with worthwhile boost levels. I've been doing some reading on WI, and it sounds like just the ticket for this application. Both the heat capacity and the heat of vaporization of water are much much larger than gasoline. This means that cylinder temps can be brought down and a more optimum a/f ratio can be acheived while still keeping the cylinder temps down (and preventing detonation). From what I've read, about a 10% increase in HP is possible in a boosted motor just from moving the a/f ratio closer to 12.5:1 vs the more typical 11:1 for turbo applications.
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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. |
#28
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Water Injection also raises the compression a little, since water doesn't compress. It was a common thing on WWII fighters.
- Rob |
#29
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As we say in Wi-Sconsin, "Dis is Just ona them things eh? " phil
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~Phil Teal 1992 Subaru SVX Turbo - Sold in May 2011 to peace-frog. |
#30
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When I spoke with Cobb Tuning this morning, they felt that the max acheiveable boost with the stock pistons was around 5-6 psi, contingent upon using an intercooler. I chatted with them at length about the boost potential, and according to them, the situation with the SVX is very similar to the 2.5RS. Both are 10:1 CR motors, and the piston design is fairly similar. The two main failures that occur are 1) the high cylinder temps resulting from the very high pressures due to the 10:1 CR cause the edge of the piston to melt away, and 2) the high cylinder pressures, especially if detonation occurs, causes the ring lands to break. They weren't terribly excited about WI, but they felt an IC was definitely necessary.
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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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