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#31 | ||
Meep Meep
Join Date: Mar 2007
Location: Southside
Posts: 1,513
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Pity GM put all their eggs in the Volt basket and the next line of V8's will be developed on using money psyphoned out of other business units.
Take a look at what Lutz is saying, either the small blocks getting a new block or its getting new heads. But he cant develop a whole engine at once.
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Thundering on.... |
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#32 | ||
FF.Com.Au Hardcore
Join Date: Jan 2005
Posts: 14,654
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"Grandads axe" was a very apt description...
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335 S/C GT: The new KING of Australian made performance cars.. ![]() |
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#33 | ||
Watts a panhard.
Join Date: Jan 2008
Posts: 929
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Sorry, wrong thread...
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#34 | |||
XP Coupe
Join Date: Jan 2005
Posts: 2,098
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Quote:
The generally accepted notions by design engineers are: pushrods have a heavy valve train, which limits reliable rpm; pushrod valve trains flex, limiting aggressive grinds; the tradeoff is to increase capacity, resulting in fuel economy loss when on power; pushrod engines are cheaper to make than complex DOHC castings. |
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#35 | ||
1999 Ford Fairmont Ghia
Join Date: Mar 2007
Location: NSW
Posts: 1,162
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I thought GM had already developed VVT pushrod engines as well as ones with 3 valve heads. I remember the LS7 was originally supposed to have a 3 valve head.
Also doesn't BMW and Moto Guzzi already succesfully run motorcycle engines with 4 valves per head? |
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#36 | |||
Pity the fool
Join Date: Jan 2007
Location: Wait Awhile
Posts: 8,997
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Quote:
Also, I would take whatever Bob kLutz says with a pinch of crap.
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Fords I own or have owned: 1970 XW Falcon GT replica ![]() Proud to buy Australian and support Ford Australia through thick and thin |
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#37 | ||
Regular Member
Join Date: Aug 2006
Posts: 105
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Also doesn't BMW and Moto Guzzi already succesfully run motorcycle engines with 4 valves per head?[/QUOTE]
As do most other motorcycle companies, for a long time! |
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#38 | ||
Trev
Join Date: Apr 2006
Location: Was Perth, now country Vic
Posts: 8,017
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And Yamaha ran five valve head for nigh on 20 years. And then of course there was Honda with an eight valve per cylinder design...
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#39 | |||
VFII SS UTE
Join Date: Apr 2007
Location: Central Coast
Posts: 6,353
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Quote:
1912 for a 4V DOHC. 1949 oldsmobile OHV not shure what year with the ford flathead tho.
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#40 | |||
FF.Com.Au Hardcore
Join Date: Mar 2006
Posts: 665
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#41 | |||
FF.Com.Au Hardcore
Join Date: Mar 2005
Location: Vic/NSW
Posts: 2,687
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Quote:
Besides it will still take less energy to turn 4 camshafts in a OHC engine than one in a pushrod engine. The reasons for this are: -A OHC Bucket system has no lateral movement, unlike a rockers on a valve tip of a pushrod motor. -A pushrod motor has friction at the lifter, both ends of the push rod and at the rocker bearings. -A pushrod motor requires far higher valve spring rates to control the heavier valves, and greater lifts. |
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#42 | ||
FF.Com.Au Hardcore
Join Date: Feb 2008
Posts: 501
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The future doesn't involve 8 cyls
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#43 | |||
XP Coupe
Join Date: Jan 2005
Posts: 2,098
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Quote:
Wasn't the first production OHV by Buick in 1902? Before that, side valve engines were the go. |
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#44 | ||
FF.Com.Au Hardcore
Join Date: Oct 2008
Location: Hughenden.Queensland
Posts: 927
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Over head cams? multi valve?
try 1929 with Deusenberg's 420cubic inch straight eight twin-cam,4 valves per cylinder,and twin spark, and if that's not enough ,this engine was available with supercharging as well as King Solomon said "there is nothing new under the sun"( sorry Toyota ....not!)
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#45 | |||
FF.Com.Au Hardcore
Join Date: Mar 2005
Location: Vic/NSW
Posts: 2,687
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#46 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Posts: 622
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At this late stage in the game I can't see GM going in a totally different direction to the current push-rod small block architecture - they don't have the cash anyway. Isn't the new V8 that this article is alluding to the GEN V 5.5Litre OHV V8 with direct injection? I think the variable timing statement maybe a bit of a furphy or something that won't be available until much later. GEN V is supposed to be production ready by 2012?
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Quote: From www.motortrend.com "Torque is the new horsepower" |
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#47 | |||
FF.Com.Au Hardcore
Join Date: Feb 2008
Posts: 501
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#48 | ||
Performance moderator
![]() Join Date: Feb 2005
Location: St Clair..N.S.W
Posts: 14,875
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Isn't the block they use in V8 series a twin cam engine as well ???
They will make a new V8 when Daewoo make one ???
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Real cars are not driven by front wheels,real cars lift them!!... BABYS ARE BOTTLE FED, REAL MEN GET BLOWN. Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic! Dart 330ci block turbo black pearl EBXR8 482 rwkw.. Daily driver GTE FG.. Projects http://www.fordforums.com.au/showthread.php?t=107711 http://www.fordforums.com.au/showthr...8+turbo&page=4 |
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#49 | |||
FF.Com.Au Hardcore
Join Date: Jul 2005
Location: Newcastle, NSW
Posts: 3,926
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#50 | ||
FF.Com.Au Hardcore
Join Date: Jun 2007
Posts: 3,408
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Pushrod engines sound better and are so easy to work on and last forever. throw on a Direct injection system to make them more eco friendly and away u go again. Only OHC engines i like are ford inline 6, Barra & toyota 1JZ & 2JZ.
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#51 | |||
Regular Member
Join Date: Jan 2010
Posts: 194
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#52 | |||
Ute Forum Moderator
![]() Join Date: Dec 2004
Location: Melb
Posts: 7,227
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Quote:
From what I can find with a quick search on OHV - a 1886 Daimler patent for an engine included an ohv exhaust valve. 1902 David Dunbar Buick developed and engine with both valves ohv. 1904 Lanchester cars with ohv sold commercially. Even in the US there were plenty of ohv used prior to the Olds V8 - but in manufacturers no longer in existence hence lack of info on Wikipedia. From a practical point of view the ohv had to be invented before you could have an ohc! More relevant to the topic, when looking at that I came across the CamInCam system used on the Viper V10 which could be further developed to give TiVCT, and refers to GM having it already - http://www.sae.org/automag/technewsl...ertrain/04.htm |
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#53 | |||
Regular Member
Join Date: May 2007
Posts: 489
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#54 | |||
FF.Com.Au Hardcore
Join Date: Jan 2005
Posts: 14,654
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Quote:
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335 S/C GT: The new KING of Australian made performance cars.. ![]() |
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#55 | ||
Regular Member
Join Date: May 2007
Posts: 489
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I'm Talking About High Rpm Reliability, Not About Prodution Cars.
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#56 | |||
FF.Com.Au Hardcore
Join Date: Jan 2005
Posts: 14,654
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Quote:
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335 S/C GT: The new KING of Australian made performance cars.. ![]() |
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#57 | ||
Regular Member
Join Date: May 2007
Posts: 489
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Do modified production engines count? Are you a GT ENTHUSIAST 4V MAN!
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#58 | |||
XP Coupe
Join Date: Jan 2005
Posts: 2,098
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Quote:
Why are you on your high horse? I don't have a problem with pushrods, you are just assuming I do. They have their place, but if you really want to crank an engine up them DOHC makes it easier in so many ways... it;s not black magic and it's not a conspiracy. |
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#59 | |||
FF.Com.Au Hardcore
Join Date: Jan 2005
Posts: 3,144
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#60 | |||
VFII SS UTE
Join Date: Apr 2007
Location: Central Coast
Posts: 6,353
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Quote:
http://www.motorera.com/history/hist03.htm The T-head engine gave way to the L-head (also called the flat-head or side-valve) engine in which valves were placed on one side of the engine. The L-head dominated the scene for years. Ford used it on V8s until 1953. But waiting in the wings was another design, introduced in 1898 by Wilkinson Motor Car Co. -- an engine that had the camshaft and valves in the cylinder heads. You know it as the overhead-cam (OHC) or overhead-valve (OHV).
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I don't often hear the sound of a screaming LSX. But when I do, So do the neighbours.. GO SOUTHS
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