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#1
05-23-2008, 05:58 PM
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Whats the highest compression on a NA SVX
I have a question what is and what do we beleive is the highest compression we can get on a NA SVX on pump fuel?
Tony
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR. 
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#2
05-23-2008, 07:31 PM
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FWIW, when my friend Jack was having his EG33-powered 2.5RS dynoed (stock engine internally), on US-spec 93 octane (RON + MON/2 method), the engine was completely tolerant of 42 degrees of ignition timing at all engine speeds. No power was gained or lost at higher settings, but it really didn't seem to matter if he had 34 degrees, 38 degrees, or 42 degrees...it did not 'ping'. Now, with the altered camshafts and slightly higher compression from head milling in his current engine, it can tolerate close to 50 degrees before knock sets in. But, it loses power now after 38 degrees. Naturally, the higher overlap of the 'big' cams bleeds off some combustion pressures. Timing is set substantially higher than it was previously at lower rpm levels to somewhat compensate for the overlap, and to aid starting. That said, I believe the chamber design to be fairly efficient. I suppose I will find out when my other friend Andrew has me build his EG33 with 12:1 compression! Regards,
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#3
05-23-2008, 07:49 PM
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Bob when you build the 12:1 engine will you get new pistons?
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR.
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#4
05-23-2008, 07:55 PM
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Remember this is an entirely different build from Jack's car, so we're starting from scratch, and the budget will be a bit higher.
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#5
05-23-2008, 08:46 PM
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What sort of budget do you expect?
__________________
1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR.
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#6
05-24-2008, 09:30 AM
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Quote:
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#7
05-24-2008, 03:28 PM
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Bob are you running a oil cooler on the Jack's engine.
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1995 - SVX 700,000 K Mine, DMS Struts to lift car 2in. Tyres Wrangler Silent Armor 235/70R16, PBR Radiator. 6 speed with DCCD and R180 rer diff, Heavy duty top strut mounts front and rear. Speedo correction box fitted. New stero (gave up on the old one). Back seat removed and 2 spare tyres fitted for desert driving. ECUTune SC sitting in the box for the next SVX. 1992 - SVX 255 K Wife (Want to stay Married so not allowed to fit SC) 1992 - SVX Pearl with black roof race car roll cauge etc ready to race. Ex Tasman Targa car. 1995 - SVX Green low k mint condiation. 1995 - SVX Rally car, ex Matts car. Now to be used on track. 1992 - SVX red & Black being converted to Mid Engine. 1995 - SVX Red 143,000 bit rough. Owned 5 others Subaru back to a 1974 1400 GSR.
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#8
05-25-2008, 11:05 AM
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Quote:
A cooler and pump for the 5mt. A cooler and pump for the rear axle (160mm). An external electric water pump for the engine. A cooler for the power steering. So I guess he has most of the systems covered? Racing is indeed hard on the car!
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