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Omnipelagos.com ~ article "Oversquare" An oversquare engine is generally more reliable, wears less, and can be run at a higher speed; though with the aid of modern technology, the disadvantages of undersquare or longstroke engines have been overcome. In oversquare engines power does not suffer, but low-speed torque does to some degree, since torque is relative to crank throw (distance from the crank center to the crankpin)—the leverage, essentially. An oversquare engine cannot have as high a compression ratio as a similar engine with a much higher stroke ratio, and using the same octane fuel. www.omnipelagos.com /entry?n=oversquare   (255 words)

'Undersquare' vs. 'Oversquare' pistons?? Need Help!!! An oversquare motor of equal displacement can make the same amount, but you might have to rev it three times faster to reach the power band. Apparently oversquare pistons would be heavier than undersquare pistons of the same displacement due to their larger radius. Oversquare pistons have a larger surface area affected by the gas pressure. physicsforums.com /showthread.php?p=1413639#post1413639   (1435 words)

oversquare oversquare is one of the topics in focus at Global Oneness. Its oversquare design, which sported an 89mm bore and 80mm stroke, gave the high-revving engine an output of 220bhp (164 kW) and 200lb/ft of torque (271 Nm) at the flywheel. The engine's physical dimensions (oversquare 4.00 in bore and 3.48 in stroke, 102 mm by 88 mm) are nearly identical to the 400 hp (300 kW) LS2 engine of today, but of course much has changed. www.experiencefestival.com /oversquare   (2132 words)

[No title]   (Site not responding. Last check: 2007-11-03) Some airplane owners replace their two-bladed props with three blades to reduce noise and increase efficiency, since each of the three blades now has an angle-of-attack which is less than for the two-bladed prop. At oversquare (27" and 2400RPM) the blades may be at Vx, still efficient, but less so than squared. Finally, at severe oversquare (27" and 2200RPM) the blades are in a stall, and they produce negligible thrust (analogous to zero lift of the wing). www.cse.ucsc.edu /~mjboyd/cfi/hiperf   (1763 words)

Stroke ratio - Wikipedia, the free encyclopedia It has been suggested that oversquare be merged into this article or section. It has been suggested that undersquare be merged into this article or section. Such an engine is referred as oversquare or shortstroke engine. en.wikipedia.org /wiki/Stroke_ratio   (436 words)

LS1TECH - Why aren't 396 LS1 Strokers popular?   (Site not responding. Last check: 2007-11-03) Oversquare engines tend to rev quicker than undersquare engines also. The LS1 396 uses a 3.9" bore and a 4.125" stroke. A sleeved 427 is oversquare at a 4.125 bore by 4.00" stroke or an Iron block is almost a square bore at a 4.06" bore and 4.125" stroke. www.ls1tech.com /forums/printthread.php?t=113522   (645 words)

Cycle World - Alternative Engine Designs But the valves remained the original two, parallel and perpendicular to the head plane and, most meaningfully, the Heron-type combustion chamber was retained and worked wonders in association with the most oversquare bore/stroke ratio of the lot—89.0 x 60.3mm. The central intake valve can be smaller than the other two to further minimize the influence of its pocket on the neatness of the combustion chamber configuration and of the squish area surrounding it. This squish is very wide to get high compression ratios teamed with a clean combustion chamber design, even in combination with "wildly" oversquare bore/stroke ratios and to take maximum advantage of the tumble motion in the inhaled charge. www.cycleworld.com /article.asp?section_id=3&article_id=83   (940 words)

Cessna Owner Organization - www.cessnaowner.org They were always cautioned to reduce MP first to 25, THEN to reduce RPM to 2500 (so that an oversquare condition would not occur, even temporarily.) This technique continued to be taught throughout the power-setting regime. The entire idea of teaching pilots to never allow oversquare conditions was a combination of factors, most of which no longer apply. One was that, during the period of time it was taught, several quality-levels of fuel were dispensed and sold at airports each of which carried a different octane rating. www.cessnaowner.org /viewforumtopic.asp?id=398   (1848 words)

ROADandTRACK.com -- Road Tests - Aston Martin V8 Vantage (11/2005) It started life as a 300-bhp Jaguar dohc 90-degree V-8, but when the engineers were done, the only familiar component was the block. Where the Jaguar V-8 was slightly undersquare, meaning the bore was smaller than the stroke, the Aston is slightly oversquare. When combined with variable intake timing, a resonance induction system and an active exhaust bypass valve, the performance is spot-on for the look of the car. www.roadandtrack.com /article.asp?section_id=3&article_id=2853&page_number=2   (620 words)

Amazon.com: "oversquare design": Key Phrase page   (Site not responding. Last check: 2007-11-03) It was an oversquare design with a cast-iron block and an alloy head,... Since the original criterion was to make a high-revving engine of oversquare design (bore diameter larger than stroke), a very short connecting rod length was deemed desirable, along with a short, flat-top piston. A lightweight engine, its oversquare design (the bore is bigger than the stroke), good breathing characteristics, and a lightweight valve train capable of high rpm's... www.amazon.com /phrase/oversquare-design   (540 words)

Opel Community Forums - View Single Post - 1.9 bore size For one, an oversquare engine is far better for higher rpms. Modern materials, plus low-friction coatings, the need for low rpm torque, stricter emissions standards (small bore=less flame travel) not to mention oil technology....they all factor into the current trend of building square and undersquare engines. Oversquare engines are still the domain of purpose-built racing engines however. www.opelgt.com /forums/5860-post4.html   (129 words)

Engine Package : Swapping Parts For Power - Team Integra ii) you do not lower the rod ratio like in the case of stroking and this allows you to move towards having a more "oversquare" (or less "undersquare") engine layout. Oversquare engines mean that the bore > stroke. The Formula One and FIM World Superbike/FIM Grand Prix bike racing engines were all oversquare engines since 2001 - that should tell you which layout is better for high revving, small displacement engine performance (compared to big displacement 5-7L, www.team-integra.net /sections/articles/showArticle.asp?ArticleID=21   (1377 words)

Flying Magazine : Forums - Posts   (Site not responding. Last check: 2007-11-03) Effectively you are letting almost a full atmosphere of pressure into the engine via the manifold (almost, but not quite 30 inches, no, I'm not talking about turbocharged engines as that is another kettle of fish). So, even at your t/off power setting you are operating the engine in what is refered to as an "oversquare" power setting, ie; 29"/2700rpm. Now, in crz you will find that some manufacturers can sometimes recommend an oversquare power setting but this does not appear very often as a rule. forums.flyingmag.com /ibb/posts.aspx?postID=259   (412 words)

LS1TECH - stroke = 4.165 vs. bore = 3.55??? Undersquare engines are usually designed on a compromise, and those Ford modular engines are a perfect example. The main drawback to undersquare engines is that they aren't as suited for quick revs like an oversquare engine. Also, with smaller cylinders, there is more valve shrouding compared with an oversquare engine. www.ls1tech.com /forums/printthread.php?t=105350   (916 words)

TheDieselStop.Com Forums: Let's get the Duramax in on this "longest life" argument Oversquare engines can rev higher, but at the expense of low-end torque. This increase in displacement holding other engine parameters equal is by far the biggest factor in increasing it's ability to make a higher peak torque value within whatever rpm range the induction tract including forced induction etc., is designed to operate at. In other words the peak torque rpm of the oversquare example will tend to be higher, and logically the area under the torque curve will be greater towards that higher rpm range the peak torque value resides at. www.thedieselstop.com /archives/ubbthreads/GeneralDiesel1/showflat.php-Cat=&Number=1249130&page=26&view=collapsed&sb=5&o=&fpart=1.htm   (8281 words)

Prop 101 questions square & oversquare props ? - RC Groups I am running a 2200 kv motor, on about 600 watts static on freshly charged batteries (probably 500 to 550 in flight, at full power, after the batts have been running for a minute). So, I was thinking of going to a slightly higher kv motor, 2500 kv, and going to a square or oversquare prop. More oversquare (p/d over about 1.2) may still increase top speed but at the expense of acceleration. www.rcgroups.com /forums/showthread.php?t=451877   (1965 words)

Long/ Short stroke differences.. : RC Universe! The Ultimate RC forum   (Site not responding. Last check: 2007-11-03) A good example of this is the latest OS LA's which have done away with the boost port so now the mixture has to move faster through the remaining two ports. As a general rule, engines that are "short stroke" are going to be considered those that are oversquare. If you imagine the piston having to change directions at both the top and bottom of the bore, and imagine two vastly different engines, one very oversquare, and one very under, the piston velocity and the acceleration felt by the undersquare engine is going to be much greater than the oversquare. utopia.rcuniverse.com /rcarchive/145/2002/12/3/93582   (661 words)

Speedarena Forums: Profile for OverSquare OverSquare last posted at 8:00 PM 9/2/2007 to parting out 92 jetta gl cali emission tornado red 5 speed (in Golf II/Jetta II Parts) OverSquare has been a member for 162 days. Click here to search for topics created by OverSquare. forums.speedarena.com /zerouser?cmd=viewprofile&id=321127   (66 words)

New Boss Engine - Page 3 - Mustang Evolution The new (coming, we believe in 2008 F-series) Boss will likely have significantly larger bore spacing to permit somewhere in the vicinity of 110mm bores (modular is effectively limited to approx 95mm). The overwhelming beauty of a multi-valve, OHC, oversquare, VVT, DCI motor is that a 6.2L engine of that genre should meet PZEV (Partial Zero Emissions Vehicle) certification, be high-revving, make in excess of 500HP (NA) have broad torque AND be super smooth/tractable all at the same time! All that hat simply cannot be done with 2-valves and the high reciprocating mass of pushrods. www.mustangevolution.com /forum/t24176-3#post353671   (1673 words)

Oversquare Operation After reading a few Pelican's Perch articles (the links posted here about engine operation)- I've begun to wonder about this oversquare operation theory and if it is more efficient or if it makes any sense at all. Are you talking about operating oversquare during the climb? The normally aspirated 182 or 206 won't make enough MP to get oversquare unless you pull the RPM back...and if you do that you're making less power. www.diverdriver.com /forum/index.php?topic=267.0;prev_next=prev   (176 words)

'Cortina Gets Four Doors'   (Site not responding. Last check: 2007-11-03) One of the models planned to get the full Australian treatment is the four door version which has just been introduced to supplement the two door car. However, the engine remains as the 1200 cc, oversquare, three main bearing unit fitted to the now familiar two-door Cortina. In England of course, a full 1500 cc, five bearing engine is offered as optional equipment at extra cost. www.pixelmatic.com.au /cortina/articles/4doors.htm   (1266 words)

2007 Mercedes-Benz CLK63 AMG First Drive   (Site not responding. Last check: 2007-11-03) That is unless you can lower the car's top at the touch of a button and enjoy it all the more, like we did in the 2007 Mercedes-Benz CLK63 AMG. The new 6.2-liter engine, designed from scratch by the powerhouse AMG division of Mercedes-Benz, features a wildly "oversquare" design; that is, the diameter of the cylinder bores (102.2mm) is larger than the stroke (94.6mm) of the pistons. The oversquare design of the engine gives it a uniquely manly charm. www.edmunds.com /insideline/do/Drives/FirstDrives/articleId=110099   (1173 words)

Motor Trend: Destination: Aspiration The Infiniti V-6 is heavily oversquare with large-bore cylinders and short piston strokes. However, because it's undergone many changes (newly reinforced cast-iron block with new connecting rods and a forged-steel crankshaft), one could say it, too, is new. Due to the fact that this narrow GM V-6 is used in both transverse and longitudinal applications, it has an unusual 54° bank angle that's not as smooth or smooth-sounding as either the Infiniti's oversquare 60° V-6 or the ultra-placid I-6 of the BMW. www.motortrend.com /roadtests/sedan/112_0208_sedan/index4.html   (975 words)

iPilot View Message As usual, Avbug has pretty well said all of consequence there is to say. 1) While traditional wisdom maintained that operating in an 'oversquare' condition was taboo, some manufacturers have since revised that mindset. Determine what the manufacturers & type clubs/organizations now recommend for the equipment you're operating; they generally have done more than an adequate amount of research to qualify them as experts in their areas, & what used to be 'verbotin' in many cases is now recommended. www.ipilot.com /forum/message.aspx?pid=7788   (339 words)

New Bikes 2006 - Feature Review - Motorcyclist Online Taking its external cues from Formula One automobiles instead of MotoGP motorcycles, the heart of Yamaha’s first Extreme Supersport is a totally new 599cc four. Powered by a lightly domesticated version of the current fuel-injected 20-valve, 998cc R1 engine, this ’06 version should overshadow its predecessor’s 125.7 rear-wheel horses. The R1-spec 77.0mm bore and 53.6mm stroke are more oversquare than the elder FZ1’s 74.0mm x 58.0mm cylinders. www.motorcyclistonline.com /features/122_0511_new_bikes_2006   (937 words)

Uly VS. V-Strom Big - Page 4 - ADVrider Check that, modern high performance engines are oversquare, the Buell being the single exceptiion. You can't be suggesting the XB engine is a state of the art performance engine, surely. Audi and VW for example, use oversquare dimensions in their 4 cylinder engines, which produce about 1 HP/L IIRC. www.advrider.com /forums/showthread.php?t=141576&page=4   (1941 words)

1971 Pontiac Firebird Trans Am The increase meant the engine was now "oversquare", meaning the stroke was longer than the diameter of the In 1970 the 400 V8 featured a 10.5:1 compression ratio, while for '71 the ratio dropped to 8.4 as the auto makers were succumbing to the pressures of the insurance companies. Since the 455 was an oversquare engine, Pontiac engineers used lighter parts in the reciporcating assembly to reduce mass, therefore relieving stress. www.iwaynet.net /~gl&lisk/1971ta.html   (1137 words)

Re: Spey's question In response to Re: Spey's question, posted by Tom Elliott on Friday, 18 February 2005, at 4:34 p.m. The abu 7000N is probable close to a 6600w in capacity. Any one chopped cCT'ed a abu 7000N yet. neilmackellow.sea-angler.org /cgi-bin/noteboards/neil.cgi?read=6631   (143 words)

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