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A 112-114 degree lobe center will have a better idle and produce more vacuum with less overlap. Do you know what the best lobe separation angle for your car engine is? A narrower LCA will increase valve overlap and close the (intake) valve earlier, which explains the typical rougher idler and more midrange behaviour. Now lets move to the exhaust. Save Share. Thanks for the replies, particularly that link Marc, very informative. I probably would have gone with 3.55 gears had I knows better.. You can modify the lobe center a little bit but not enough to change the actual overlap of the grind. On larger displacement units 116 to 118 degrees of separation are common. To establish the position of each lobe, the traditional reference point is where the lobes reach max lift. I also like the 106 lobe separation with the intake on 103. what does 112+2 lsa mean?? - LS1GTO Forums After spending 8 years in plant production engineering, Noah wanted to join Engine Addiction as a key member of all cars specific guides, reviews, repairs, suggestions, and more. = Tight Below 104 Deg. The 114 LSA is good for a blower or nitros motor. by bigjoe1 Sat Dec 06, 2008 10:48 pm, Post such as 290 @.050? = Moderate 108-106 Deg. by xstfudonniex Sat Dec 06, 2008 4:21 pm, Post Camshaft lobe separation angle: what does it mean? | Moore Good Ink How do the lobe separations change when you factor in turbocharging? So, the 110 LSA engine is a suitable choice for people prone to be the fan of a powerful engine with mighty acceleration power. Higher lift and longer duration profiles add power, but do so at higher engine speeds (especially true of duration). It's the scavenging effect of the high velocity exhaust gases rushing out that pulls the fresh fuel/air charge into the chamber. I would have to say that your cam choice sounds like a winner to me. 4-Link72, do you run racing gas or pump with 10.5:1 CR? It affects the powerband and temperament of a motor more than any other single part, and a slight change can turn a car from a mild-tempered grocery-getter to a downright nasty machine. As a result of this fall, the idle of the engine has to face suffering quite often. If the intake valve opens too early, it will push the new charge into the intake manifold. Has anybody experienced it/ tried it? My duration will be about 230 degrees. Moreover, a user from the Chevelle forum said. http://www.mustangworks.com/cgi-bin/moi-display.cgi?220, http://www.popularhotrodding.com/en6em_camshaft_specs/lobe_seperation_angle.html. pump gas, no additive's as well, runs good, i will put the highest octane in, which is 93.. The valve covers, valvetrain, intake manifold, harmonic balancer, front cover, timing set, and cam were yanked. It creates an unsteady manifold vacuum condition that, on a fuel-injected engine, confuses manifold air pressure (MAP) sensors, making it hard for them to regulate fueling. The 114 cam will give more low end torque, good midrange, less power up high. Average power was also down, but the engine pulled ahead of the 101 cam at 5,400 rpm, picking up 6.5 hp at peak. 108: 110: 112: 114 . It depends on the combination of engine size, head flow and head flow balance, as well as a big one, exhaust flow capabilities. The absence of engine knocking ensures that your car engine is reasonably combusting the fuel. Adding an aftermarket cam to an otherwise stock engine can boost output by 40-60 hp (or more) with no other changes (except possibly a valvespring upgrade). LS Exhaust Manifold Bolt Torque (Everything You Need To Know), Holley Power Valve Sizes: Everything There is to Know. Pick the cam with the valve timing events that fit the engine best, forget about LSA, it is only a result of the events. For any additional clarification or questions please contact our Tech Line at 714 523-0530. https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s. You can research your heads to find out where yours are, but honestly I don't think it will be worth the effort on a tow vehicle. 106 LSA: At this LSA, the car machine has to confront the reduction of idle vacuum rate quite often. Elle concerne 264 taxons des degrs divers. 108 is very tight producing lower vacuum and more of a 2 stroke "punch" powerband. 110 LSA: You will find the complete opposite scenario here. These issues can often be worked through by an advanced tuner, but always present a challenge and compromise in tuning strategy. Another related thought to consider when selecting a cam is inches of vacuum for your engine application when deciding upon a Lobe Center. It has been tried in the VW business earlier, but then they gave it up because of problems with too high temperatures around the exhaust valve, causing them them to break. Mailbag: Camshaft Lobe Separation, Nitrous Oxide & How They Relate Lobe Separation Angle Explained and How it Affects Horsepower - MotorTrend 108* or narrower lobe separation angle (LSA) is "Narrow" and 114* or wider (up to 117* or 120* for stock cams) is "Wide" , with 110 to 112* being the "normal" hot-rod cam. Alternatively, if you are running a bigger camshaft to gain maximum top-end power, cam makers often suggest reducing the lobe separation angle to recover power lost in the lower rev range.. Lunati's New Bootlegger Camshaft Series Has Strong Race - Dragzine that is why people running 112 or 114 lobe centres retard the cam ,that way the exhaust event is back were it was before .this helps in exhaust valve tempatures--anyway today i talked too barry who is the owner of shadbolt cams and we talked about cam lobe centres -he considers 108 centre quite narrow and for a very narrow power band operation ,with a 112 he figures with the carbs with straight & even runs at the valves there should be no noticable loss of low end power, a 112 lobe would be a great choice for a great street strip motor -better lower torque followed with a flatter rising torque curve as well as rpm range extended 500-700 rpm -. Anybody here run a 108 LSA? LSA is the distance from the centerline of the intake lobe to the centerline of exhaust lobe. A tighter LSA is always going to have more overlap, which allows the exhaust and intake systemif they're tuned wellto work together.". What Are The Wastegate Stuck Open Symptoms? thanks. but less of it at the same time. Test 1 was easy. I think you are asking a lot of a cam . Due to the tightness and frequent overlapping of the intake and exhaust valves, the engine cant generate the high RPM as it is supposed to. The lobe separation angle is the angle in camshaft degrees between the maximum lift points, or centerlines, of the intake and exhaust lobes, says Eric Bolander of Erson Cams. It provides a spark plug with the high voltage needed for combustion. But that doesnt mean high-strung racing engines cant see gains, as well. Some prefer a narrow powerband, and some prefer the broader one. 110 LSA: On the contrary, it is pretty unpleasant to inform you that the efficient compression rate decreases at 110 LSA. A few other major and, Read More Heres What Causes Your Car to Bog Down When AcceleratingContinue, Your email address will not be published. (LOBE SEPARATION ANGLE)cam CRANES 110921 has the intake close at 45 degrees ABDC while the wider lsa CRANES 114681 closes the valves at 50.0 ABDC . The Idles increasing vacuum improves the idle quality and the engines overall performance. Camshaft Shootout: Lobe-Separation Angle Tested and Explained - MotorTrend VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. But you always have a cam card with the engine. The reduced rate of the EGR effect lowers oxygen circulation in the engines combustion chamber. Camshafts with a substantial overlapping tendency should not be used in vehicles driven on public streets. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. 110 LSA: On the other hand, 110 LSA is comparatively a wider LSA; it can generate a massive amount of RPM for the engine. not exactly true, Ive seen custom grinds that are on 108 lca, smooth idle, high vacuum an even able to run efi, usually on an off the shelf cam it is true. After swimming through the entire article, I hope you are now well aware of the 102 vs 110 lobe separation angle. 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But to choose the perfect cam, all of that information needs understanding. Either learn to fix it, or learn to write checks. Ultimately, it comes down to how you want the engine to run, the car's intended purpose, and what you are willing to tolerate. This wave tuning is what helps performance engines achieve volumetric efficiencies of more than 100 percent. An RV or towing camshaft, which is considered a mild performance or an economy cam, will often have a narrower LSA, between 112 and 114 degrees. The takeaway from this test is camshaft LSA is a double-edged sword. If you shift at 7500-7800 add 4-6 degrees to both intake and exhaust and spread the lobe separation to 108-110. Next up was the 112-degree cam, which actually lost out in peak power slightly to the 120-degree cam, but offered considerably more torque. by bug1914 Tue May 13, 2003 2:56 am, Post The standard bore block was then stuffed with a 4340 forged steel 4.0-inch crank and 6.125-inch rods, along with a set of flat-top, forged JE pistons. Noah knows a lot about whats happening in the car industry with the latest piloting productions thanks to his professional experience. This is why the LS series, and many other modern engines, can make great power on top and bottom with wide LSA camshafts and why a plethora of factory cylinder heads are flowing near (or above) 300 cfm. by ANT Mon May 12, 2003 1:47 pm, Post As a result, you can enjoy a pleasing engine outcome. The introduction of Lunati'snew Bootleggerhydraulic series - with its wicked 108-degree lobe-separation angle, fast opening profile and plenty of area under the lift curve - will serve only to fuel the flames on this heated bench-racing topic. Lobe separation angles, he continues, are influenced by the camshaft grind. The same is true for intake valve closing. somthing to that aspect. It will sound lovely I'm sure. you cannot just take a random change in a lobe separation angle and say 1 is better than the other. Usually, an old gas tank is responsible for a vehicle bogging down during acceleration. Cam ???? Same Cam 112 vs. 114 Sep., What happens? The Wastegate works by releasing the pressure built inside, Read More What Are The Wastegate Stuck Open Symptoms?Continue, Oops! Lobe Separation Angle "LSA " | Yellow Bullet Forums Although both wide (112-116) and narrow (102-110) lobe separation angles do have an effect on overlap, it's still possible to get a lot of overlap with very wide lobe separation angle cams. Another difference between the two involves the power curve. Lobe separation angle does. Cam timing plays an important role not only in the power generated but also the overall character of the powerplant. Lobe Separation Angle "LSA "Jump to Latest Follow 1 - 17 of 17 Posts . Well, there can be different reasons for this problem. 68 Mustang, 306, AFR 185\'s, CI cam, FPA\'s, Bigs 650 DP, T5Z, 9" w/4.33's. A good amount of idle vacuum or increased idle vacuum found at 110 LSA advances the engines efficiency. That is why 106 LSA consumes less oil. Simply put, the lobe center of the camshaft controls where the power curve is applied.