LS9... the apex of the pushrod engine
i think we have reached our limit on the pushrod engine with the LS9...
i also believe that if there is an LS10 it will be 4 valve double overhead cam..then 1000 horsepower will be possible...
with the larger valve area of 4 valves and the absence of push rods..the rpm's come up and the gas flow increases..dramatically
what do you think?
With the larger valve area of 4 valves, intake velocities drop, hurting low-RPM torque and fuel economy.
Overhead cam, multi-valve engines have been around since the 1920's in both high end automobiles of the time and in aircraft engines of World War II. So, there's really nothing new or "high-tech" about them. They have their place but they are not the be-all or end-all to high performance engines.
Same can be said for turbochargers and superchargers - they've been around a long time also.
Overhead valve, push-rod engines allow for biggers engines and less weight in the same volume compared to overhead cam engines. Push-rod engines are cheaper to build - less parts. I don't see push-rod engines going away anytime soon.
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Originally Posted by Scissors
i was thinking they would keep the supercharger
The LS9 is a nice engine, but it still suffers from ancient induction. It is incredibly ineffecient, downright sloppy. Now, if/when Chevy does a DI LSanything, then we are going to have something to really celebrate!
Can you imagine 12:1 CR, while using regular unleaded? Ok, how about 14:1 while using premuim? Just think of it as an LS9 running with 2bar...
Anyone know what a 375 cu in engine, running with 29 pounds of boost can do? I remember Chevy had a LT1 (350) that was 30-35 lbs of boost. About 1500HP if I remember. Was it the "Sledgehammer?" Speeds in the 260-270mph range...hmmmm, this is going to be great...as long as Wahington doesn't meddle...
Additional V8 information, perhaps. . .
GM Announces Small Block V8 Plant Investment
GM speaks the first official word on the next-generation Small Block.
April 27, 2010
By: Nick Saporito
2010 LS9 Small Block V8 block pictured.
General Motors has announced a $890 Million investment into five North American engine assembly plants. The investment is for production of the next-generation Small Block V8 engines. Plants receiving part of the investment include:
- Tonawanda, NY -- $400 Million, 710 additional jobs
- St. Catherines, Ontario -- $235 Million, 400 additional jobs
- Defiance, OH -- $115 Million, 189 additional jobs
- Bedford, IN -- $111 Million, 245 additional jobs
- Bay City, MI -- $32 Million, 80 additional jobs.
GM is also confirming that the next-generation Small Block V8's will have "unprecedented fuel economy through direct injection and an all-new advanced combustion system design." GMI sources have confirmed numerous times that all of the Generation V Small Block V8's will come with direct injection and variable valve timing.
The investments include updating production facilities and building out new, flexible manufacturing lines to produce the new V8's. GM states they will be releasing product and engine details at a later date.
After today's announcement New GM has invested about $2.3 billion in 22 facilities in the United States and Canada. The investments equate to a total of 9,100 new or restored jobs since July 2009.
The Corvette Sledgehammer used a twin turbo L98 that ran 254mph using 880hp.
Originally Posted by NORTY
YouTube - Callaway Corvette twin turbo Sledgehammer reaches 254.7mph
Technical Writer for Internet & Print Media
Actually...there once was an "LT-5 version 2". It was a 475-hp upgrade of the 93-95 engine fitted with different cams and other improvements including variable valve timing. It was intended for introduction in 1995 and be used into the C5 era.
Originally Posted by ßill
Sadly, the VVT LT5 never got past the prototype stage. Two were built. Reportedly, Lingenfelter Performance Engineering owns one of them.
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