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Topic: Undersquare

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	Undersquare \| InterSites
		Having a longer stroke usually means greater friction, a weaker crankshaft, and a smaller bore means smaller valves which restricts gaseous exchange.
		Although an undersquare engine is generally less reliable, wears more, and cannot be run at as high a speed than an oversquare engine, they tend to offer better fuel economy and somewhat better emissions.
		An undersquare engine does not overheat as easily as similar oversquare engine.
	www.intersites.co.uk /22255 (109 words)

	The Rockman Anime Music Video Station :: Forum Intergation with EXE Undersquare!
		The Rockman Anime Music Video Station :: Forum Intergation with EXE Undersquare!
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	rockmanamv.com /forum/content.php?mode=view&t=400&sid=31baee4c3b440e1506f55262f009ec08 (265 words)

	Engine Package : Swapping Parts For Power - Team Integra (Site not responding. Last check: 2007-10-25)
		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.
		Having a less undersquare layout and maintaining your rod ratio allows you to rev higher compared to stroking an engine.
		Currently our B18 engines in stock form are undersquare (Bore 81mm vs Stroke 87.2-89mm).
	www.team-integra.net /sections/articles/showArticle.asp?ArticleID=21 (1377 words)

	Undersquare at AllExperts
		This can be a negative trait, since a longer stroke usually means greater friction, a weaker crankshaft, and a smaller bore means smaller valves which restricts gaseous exchange; however, with the aid of modern technology, these are not the large problems that they used to be.
		Undersquare engines are typically shorter in length, but heavier and taller than equivalent oversquare ones, which is one of the reasons why this type of engine is not generally used.
		Willys also used mostly undersquare engines, in fact the L- and F-134 engines, with their fairly small 3.125 inch bore and outrageous 4.375 inch stroke, are probably the most undersquare engines ever built.
	en.allexperts.com /e/u/un/undersquare.htm (399 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.
		Compared to the Ford unit, which seems like an extreme undersquare engine (4.165 stroke, bore 3.55), however, my proposed stroker would be a lot less undersquare...
	www.ls1tech.com /forums/printthread.php?t=105350 (916 words)

	harley (Site not responding. Last check: 2007-10-25)
		"Undersquare" implies that the piston stroke is larger than the bore diameter.
		By contrast, high-revving Japanese four cylinder engines often have an oversquare bore and stroke relationship (the bore is larger than the stroke).
		Oversquare engines rev higher than undersquare engines and they can make impressive horsepower at top rpm.
	zenfire.ws /ironman/harley.htm (5963 words)

	Definition of Undersquare
		A piston engine is undersquare if its cylinders have a smaller bore (width, diameter) than stroke (length of piston travel).
		This can be a negative trait, since a longer stroke means greater friction and a weaker crankshaft.
		An undersquare engine usually has a lower redline than an oversquare one, but it may generate more low-end torque.
	www.wordiq.com /definition/Undersquare (127 words)

	Mega Man Battle Network 2 Walkthrough/FAQ - IGN FAQs
		There's a great informant in UnderSquare that they say knows the keyword, but...
		Well, I'm sure no one is gonna check for themselves, so it could be a lie, or some kind of urban legend...
		When he's low on HP, he'll use his "Double Team" attack where he and a blue version of himself ram at you.
	faqs.ign.com /articles/391/391636p1.html (16346 words)

	The Temple of VTEC - Honda and Acura Enthusiasts Online Forums > Strictly Technical > > Re: Advantages of ...
		In the real world of road cars, it seems that valvetrains are generally insufficient to rev high enough to take full advantage of an oversquare design.
		Undersquare designs are popular in some applications because with their tendency to produce peak output at the lower end of the RPM range, they tend to feel more "relaxed" while operating (family cars, trucks, suvs, etc...).
		The answer, if any, could be looked at in terms of how various types of racing engines behaved in earlier days, before modern metallurgy and modeling, manufacturing quality, etc., since modern engines are pretty much racing engines.
	www.vtec.net /forums/one-message?message_id=456841 (1854 words)

	dustbury.com: Wow, I coulda had a V6
		Longevity, of course, is the result of many factors, but there's not much doubt that a four works harder than a six when asked to perform the same tasks.
		My own car has a small undersquare four, the long stroke intended to produce some additional torque, and at its 6500-rpm redline, the mean piston speed is 3929 ft/min.
		The V6 offered as the up-option is allowed to rev to 7000 rpm, and its shorter stroke results in a mean piston speed of 3170 ft/min.
	www.dustbury.com /archives/002891.html (442 words)

	Motorcycle Daily
		The motor's output is translated by means of a V-Belt driven CVT (constantly variable transmission) clutchless trans, and from there reaches the rear wheel via a shaft drive system.
		Although slightly less undersquare than most motorcycle engines (81mm bore x 77.6mm stroke), the Burgman's powerplant is in all other respects quite similar to many current motorcycle powerplants - featuring 11.5:1 compression and electronic fuel injection.
		Up front, a larger 14-inch wheel carrying a 120/80 series tire is damped by telescopic forks and slowed by dual hydraulic disc brakes.
	motorcycledaily.com /25october06.htm (1588 words)

	Motorcycle Message Board - Motorcycle USA
		The motor's stroke has been drastically decreased from 96.8mm to just 79.4mm, making an undersquare engine (in which the stroke is greater than its bore) into a very oversquare one.
		Sorry to say, but this is not entirely correct; the stroke is the same as the XB9R engine at 79.4 mm (and the 9 engine is oversquare already, having 88.9 mm bore).
		I got the undersquare bit from someone who apparently got his numbers mixed up.
	forum.motorcycle-usa.com /default.aspx?f=54&m=238740 (1915 words)

	The Temple of VTEC - Honda and Acura Enthusiasts Online Forums > Strictly Technical > > Re: Advantages of ...
		The RSX-S is square (86x86) for example, and the current S2000 is actually undersquare (87x90?), but take a look at the Ferrari F430...
		Now an oversquare motor can pack many more explosions (revs) per minute because the piston stroke is shorter, but then it loses the leverage on the crankshaft, so generally torque production is reduced.
		But at the same time, frictional losses are reduced, so power can be equivalent or superior to an undersquare motor, albeit at higher RPMS (no problem really if you have gearing to deal with it) As others have mentioned, square motors obviously ride the fence.
	www.vtec.net /forums/one-message?message_id=456846 (1854 words)

	Olds FAQ -- 400 CID Engine Detail (Site not responding. Last check: 2007-10-25)
		Note that this decision to go with a smaller bore was also due in no small part to the desire to use a common crankshaft with the new 455 in 1968 as well.
		The result is a terribly undersquare motor (3.870 bore x 4.125 stroke) which won't rev very well.
		I recall reading that the undersquare design of the 400 and 455 in 1968 was intended to reduce the quench area in the combustion chamber to reduce emissions.
	www.442.com /oldsfaq/ofe400.htm (916 words)

	Santa Fe, New Mexico Motorcycle Services - Custom Motors (Site not responding. Last check: 2007-10-25)
		Undersquare engines produce strong torque at low to mid range rpm's because of the "leverage" advantage of a longer stroke.
		It must simply travel farther per engine cycle due to it's undersquare bore/stroke relationship.
		In spite of this disadvantage, good engine longevity is common on well-maintained bikes which is a testament to factory lower-end components but there are limits to how much loading the stock pistons, rods and crank can withstand.
	highdesertcustoms.com /custom-V-Twin.asp (5820 words)

	Olds FAQ -- 400 CID Engine Detail (Site not responding. Last check: 2007-10-25)
		Note that this decision to go with a smaller bore was also due in no small part to the desire to use a common crankshaft with the new 455 in 1968 as well.
		The result is a terribly undersquare motor (3.870 bore x 4.125 stroke) which won't rev very well.
		I recall reading that the undersquare design of the 400 and 455 in 1968 was intended to reduce the quench area in the combustion chamber to reduce emissions.
	oldsjunction.classicoldsmobile.com /oldsfaq/ofe400.htm (916 words)

	No specific topic so why limit myself? - by Mike
		I've read that an "undersquare" gasoline engine is good for torque and as anyone from Europe most likely knows, a diesel engine also has excellent torque compared to a gasoline engine.
		But both undersquare gasoline engines and diesels don't have very good horsepower.
		Undersquare engines and diesels don't rev as high has square or oversquare engines so that limits their horsepower generation right there.
	my.opera.com /undeuxtroiskid/archive/monthly/?month=200609 (607 words)

	Isuzu Rodeo - CarSpace Automotive Forums
		The reason for the difference has to do with the whole HP vs. torque an engine produces.
		In the extreme, nearly all diesel engines are undersquare, and we are all familiar with the noise levels produced by diesels.
		I will also grant that many SUV engines out there are more "carlike" due to the use of them as family grocery getters instead of tow/haul vehicles.
	townhall-talk.edmunds.com /direct/view/.ee9516d/936 (479 words)

	The UnderSquare Forums -> TUS News and Updates
		The UnderSquare Forums > TUS - Site Related > TUS News and Updates
		Posting on this board is not possible, and most features are disabled.
		By using The UnderSquare's forums, you agree to abide by all terms and conditions stated herein, which may be changed with or without notice.
	www.exe-undersq.com /forums/index.php?act=announce&f=4&id=6 (1500 words)

	Motorcycle Daily
		The air-cooled twin is fuel-injected and counterbalanced for smoothness, and up top you'll find a single overhead camshaft actuating 4 valves per cylinder.
		These valves feed the slightly undersquare (101mm x 102mm bore x stroke) bottom end, sucking air through 44mm throttle bodies to be compressed by 9.8:1 compression pistons.
		The new powerplant is also attached to an all-new transmission, featuring 6 speeds with the top gear being an overdrive designed to keep the rpm low during highway cruising.
	www.motorcycledaily.com /29april05_hammer.htm (1692 words)

	[No title]
		An oversquare engine will typically produce more horsepower and less torque than an undersquare one.
		Pony Car--A category of American cars that took its name from the Ford Mustang, one of the most successful cars in automotive history.
		Undersquare--An engine with the stroke longer than the bore, a design conducive to low-end torque, but usually not to horsepower.
	www.seriouswheels.com /car-glossary.htm (1736 words)

	Motorcycle Daily
		The motor's output is translated by means of a V-Belt driven CVT (constantly variable transmission) clutchless trans, and from there reaches the rear wheel via a shaft drive system.
		Although slightly less undersquare than most motorcycle engines (81mm bore x 77.6mm stroke), the Burgman's powerplant is in all other respects quite similar to many current motorcycle powerplants - featuring 11.5:1 compression and electronic fuel injection.
		Up front, a larger 14-inch wheel carrying a 120/80 series tire is damped by telescopic forks and slowed by dual hydraulic disc brakes.
	www.motorcycledaily.com /25october06.htm (1588 words)

	2004 Superbike Smackdown Comparison Bike Test - Motorcycle USA
		Its 73mm slug has to travel 59mm before finishing its stroke, resulting in the need for a redline 1500 rpm lower than the R1 to keep pistons speeds down.
		However, the extra leverage from the longer connecting rods pays dividends in torque production (as Harley riders have always known about their undersquare engines), and the Gixxer's mill comes off looking pretty good against the others.
		After being astounded by the outrageous performance abilities of the ZX and R1, we felt sorry for the aged GSX-R. That changed within the first dozen miles.
	www.biketestusa.com /Article_Page.aspx?ArticleID=650&Page=7 (463 words)

	DirtTrails.com \| Forums
		A big bore is 491cc or larger, like a CR500 or the ATK 700.
		Posted - 08/13/2003 : 11:10:18 PM Turns out I did some more research this evening when I got home from work and big bore vs small bore all relative.
		I assumed that Oversquare and undersquare were analogous with big bore and small bore, but they aren't.
	www.dirttrails.com /Forum/topic.asp?TOPIC_ID=5168 (244 words)

	Motorcycle Online: 1999 Yamaha Off-Road Motorcycles (Site not responding. Last check: 2007-10-25)
		For 1999, the YZ250 has been completely redesigned from the ground up with significant changes to the engine, hubs, rims, tires and suspension.
		To produce a longer-stroke layout and more-accessible power, the engine has been reconfigured from a more "square" bore & stroke of 68 x 68.8mm to "undersquare" dimensions of 66.4 x 72mm.
		The cylinder head outer diameter has been reduced from 121mm to 111mm and combustion chamber capacity is also down from 22.9cc to 22cc.
	www.motorcycle.com /mo/mcyam/99dirt.html (703 words)

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