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Post #1 Wed, Mar 1, 3:31 PM |
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Sniperhail
Senior Member - 226
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That is an incredible compression ratio, especially for a turbocharged vehicle. Is there anything special about biodiesel that allows for that? Also, whats the size of this engine? 400 horses is a lot, but if it's a 6L engine obviously thats a lot less impressive.
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Post #2 Wed, Mar 1, 4:10 PM |
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ging
Supercar Messiah - 6501
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i have a feeling it may be a typo, as turbo petrol engines usually have comp. ratios under 9.5:1.
i think it has a 3 litre displacement.
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Post #3 Wed, Mar 1, 4:40 PM |
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rickwleung
New User - 106
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Hmmm...It's not a Diesel for sure.
High compression ratio for sure..especially for a turbo. Guessing the displacement might be 2.8L Bi-Turbo V6, or a 3.6L Bi-Turbo V6 as the 2.8 is now GM's new global V8 powerplant, and was designed to have turbos strapped do it. The 3.6L is the VVT-i engine now offered in the Caddy CTS'.
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Post #4 Fri, Mar 3, 2:25 AM |
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ch1c4n3
Supercar Messiah - 1364
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This is not a biodiesel engine, it's bio-ethanol, C2H5OH, big difference. It's a 2.8L V6 as used in the 9-3 Aero and the high CR is correct, ethanol allows a higher compression ratio for turbocharged engines, similar to methanol (CH3OH) which champ cars use. The higher CR is due to the fuel being less susceptible to pre-ignition.
1973 Porsche 917/30K Can-Am, 5.4-litre F12, TT, 1100+hp/810lbft, 1860lb. Still holds the lap record at Talladega
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Post #5 Mon, Mar 6, 12:41 PM |
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Sniperhail
Senior Member - 226
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Thanks for the info. That makes sense.
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Post #6 Wed, Mar 8, 10:57 AM |
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Vettes 50th
Senior Member - 125
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uuh, a diesel couldn't run off of 12 compression. that's about half the compression it would need. and 400 isn't much when you think of it. twin turbo's, enough compression to use race octane fuel, dry sump lubrication. Ferrari made 468 about a decade ago from a 4L V8 with twin turbo's, street gas, and conventional oiling. the ethanol would allow higher compression use, as would intake cooling, exceptional ignition system, efficient head design, a little more quench built into the pistons, and if anything was heat coated. then again once you do all that, now you're talking about an engine making high horsepower using race gas, and still have good streetability.
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Post #7 Mon, Mar 13, 8:57 PM |
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vashisht
New User - 2
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Hi everybody am vashisht from mauritius,
well the high comp. ratio on the aero x is mostly due to the e100 that it uses, see the fuel that an engine uses, say gasoline, has an octane rating, and the higher the rating the more ignition advance you can impose on the engine without getting harmful detonations, and the e100 octane rating is much higher than gasoline. the more ingnition advance you have, the more power you get, and saabs as from the 80s i think uses something called APC - Automatic Performance Control - this allowed for higher comp. ratio because it uses a soleniod bleed valve some kind of electronic waste-gate hooked to the ecu and has knock sensors on the cylinder head, so the system normally will overboost the engine( yes OVERBOOST ) and its not a typo, till the point when detonation starts, then the knock sensor will signal the ecu to open the bleed valve to dump the excess boost.
besides, the aero x uses variable turbine geometry turbos, meaning the turbo can varie the angle at which the exhaust gases hits the turbine blades, thus enhencing efficiency.
Saab is different, that i should admit, me mytself i have hard times to understand its technology, but i should admit that saab engineers are damn good:
Check out these inovations if you wana know more about saab:
Saab Variable comp. ratio engine
Saab Combustion Control
Water injection
Light pressure turbocharging
Hope i have been able to help...see you later guys
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Post #8 Mon, Mar 13, 9:14 PM |
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vashisht
New User - 2
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Me again,
Just rem,....the 12;1 comp. ratio is also due to direct injection, see, normally efi engines apart from mitshubishi GDI, injects gasoline just before the intake valve, meaning finally the piston is compressing air/fuel mixture just as in carburated engines, but direct injection means that only air is compressed during the intake stroke, then at the end of the stroke, the fuel is injected at high pressure just as in diesel.........
Did you guys know that every saabs are ULEV (the recent ones)
ULEV- Ultra Low Emission Vehicle
From Vashisht
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Post #9 Mon, Jan 15, 8:36 PM |
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fpv
New User - 2
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comparing the ferrari to this is crap this car will have good preformance with good fuel comp and good emissions which the ferrari won't have. plus drivability will be heaps better.
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Posted: Today |
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Superbot
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Posted: Today |
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Superbot
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