After swimming through the entire article, I hope you are now well aware of the 102 vs 110 lobe separation angle. How to Choose a Camshaft for Street Vehicles - OnAllCylinders LSA is the distance from the centerline of the intake lobe to the centerline of exhaust lobe. probably just enough to get me in trouble.. Tests have shown that, for a given cam profile, a tighter (smaller) lobe center will produce more average horsepower and a quicker revving engine. Test 1 was easy. i think a little more torque will be good for my car.With the XE274 it was a little slugish until around 3000 rpms. Usually, an old gas tank is responsible for a vehicle bogging down during acceleration. LSA CAM TEST-108 vs 112 vs 120 - YouTube Armed with more information on camshaft theory, what will you build? No, it is not even close to the ultimate performance grind most would have picked. 106 LSA: There is an increasing chance of engine knock at the 106 lobe separation angle. how well would a 108 lsa cam do on the street over a 110? what does 112+2 lsa mean?? - LS1GTO Forums 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. You are using an out of date browser. Simply put, the lobe center of the camshaft controls where the power curve is applied. Thanks for the replies so far. Classic Inlines - How to Select a Cam Profile - FordSix Performance Forum The lobe separation angle is the angle between the two camshaft lobes that act on the valves. Going from a 110 to 112 lobe separtaion - Ford Muscle Cars Tech Forum The same is true for intake valve closing. If you want a lumper idle go with a cam with 108 LSA, the tigher the LSA the idle will be rougher. Lobe Separation Angle "LSA " | Yellow Bullet Forums Many later model engines use wide lobe separation angles to reduce overlap for idle quality and fuel economy. hydraboost is the same as a vacuum brakebooster, only the booster is replaced by a unit that does the same but under hydraulic pressure. Generally, naturally aspirated engines run narrower lobe separation angles of around 106 to 108 whereas supercharged, turbo or nitrous engines operate with 112 to 114 and higher. But an interestingly shocking fact is that this event escalates the air-fuel mixtures reaction rates, causing temperatures to rise and causing the problem of overheating the engine. changing just the LSA on my cam wouldnt make a bit of difference on vacuum operated items E ericnova72 More for Less Racer Joined Jan 13, 2007 22,026 Posts 114 lsa cam sound clips | LS1LT1 Forum L'auteur prsente une nouvelle contribution de floristique nord-africaine consacre la flore du massif du Rif et des rgions du nord du Maroc, dans le cadre gographique prdfini par le Catalogue des Plantes vasculaires du Nord du Maroc de Valds et al. Despite no changes in lift or duration, this cam sounded much more aggressive than the other two with wider LSAs. Since we were only changing the lobe separation angle, we had to make sure every variable (air/fuel, timing, water, air, and oil temps) was identical during testing. The 112-degree cam offered nearly all the low-speed and mid-range torque of the 108 cam but the peak power suffered above 5,200 rpm. Simply put, both 106 and 110 lobe separation angles have many advantages and disadvantages. Changing lobe seperation from 110 to 112-14? | For B Bodies Only Is a 108 Lobe Separation 2 Much? | Hot Rod Forum The engine will have weak performance in the low-end range.A low vacuum can also cause the brake pedal to be quite difficult to press. 108: 110: 112: 114 . If you look at any given cam catalog, you will find that the majority of street-oriented cams fall in this range. 110 LSA: On the contrary, at 110 LSA, the engine fails to reach the maximum torque, resulting in a decrease in torque rate. I've seen a few comments in threads on here that have said things like "going to the 112LC from the 108LC gives 4lbft more torque at the bottom and 2bhp more at the top" yet this would seem to go against what webcam say on. Camshaft Lobe Seperation | Team Chevelle The Idles increasing vacuum improves the idle quality and the engines overall performance. This cam also offered the highest torque output at 4,000 rpm with 522 lb-ft. Based on the peak numbers alone you might be tempted to grab the one with the tightest (108-degree) LSA, but there is more to a cam test than power. I've seen that Webcam cams can be ordered with either of the above. but less of it at the same time. i've heard of this being done something about the massive amounts of duration allowes gasses to disipate? Say you have a cam ground on a 115 and the other on a 110. As you tighten the centers ( 108 ) the same engine will make MORE power through the mide range and top end. Effect Of Changes In Cam Timing And Lobe Separation Angle - COMP Cams LCA (lobe center angle) vs LSA (lobe seperation angle) We'll send you raw engine tech articles, news, features, and videos every week from EngineLabs. What Is the SBC Header Bolt Torque? I'm sorry to disagree with that incredibly well written article, but lobe separation by itself is absolutely freaking meaningless. The Fora platform includes forum software by XenForo. 1966 Toyota Landcruiserunder construction. 01 Choosing the right lobe separation angle for your LS cam shouldn't cause anxiety. But remember, although a broader powerband has a couple of acceleration advantages, it also comes with a few drawbacks. What Are The Wastegate Stuck Open Symptoms? It is dangerous to be right in matters on which the established authorities are wrong. One segment that truly benefits from a wider LSA is the marine marine market. Pretty much standard for an RV type cam. 110 LSA: The 110 LSA shows up mechanically advantageous in mechanical aspects like higher RPM, lower engine knock, moderate cylinder pressure, improved idle vacuum, and higher piston-to-valve clearance. But this is not the only reason. #2---Choosing a Cam - Hughes Engines i have a 4 bolt 351C, stock bore, 10.5 cr with 351C Boss heads ,boss crank and rods. Higher overlapping lets less oil fall through the oil inlet. = Extremely Tight . All testing was performed with an Aeromotive fuel pump feeding a set of 42-lb/hr injectors. 114LSA +4 puts the intake centerline at 110 degrees before top dead center. . The graph above compares intake valve closing points of the three cams used in the test. Camshaft Lobe Separation Angle | Classic Car Restoration Club Engine builders Chuck Lawrence, left, and Doug Patton. 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 consulting with many experts, you are still in confusion between 106 and 110- lobe separation angles. It's wet flow tested at 690cfm. 108 vs. 110 lobe separation angle?? | Vintage Mustang Forums Post 1-4 It is one of the most common neurological disorders worldwide, 1-5 is among the most common . A cam card with its myriad numbers, acronyms, and abbreviations is one red-pen stroke away from a failed math test. For a better experience, please enable JavaScript in your browser before proceeding. Is There a Sequence? I wouldn't assume 4 links fuel requirements will mirror yours at all. 112 vs 114 lobe centers You cannot tell the differance in the two . When choosing a cam, power gains shouldn't be the only consideration. So, choose the perfect lobe separation angle for your engine, complying with the requirements of your needs. . " - Voltaire. And better gas mileage. Also present during testing was a set of 1 7/8-inch Kooks headers, Comp hydraulic roller lifters, and F-body oil pan. 106 LSA: The scale of efficient compression rises at 106 LSA. I personally prefer to sacrifice the small amount more power for better idle quality. The Wastegate works by releasing the pressure built inside, Read More What Are The Wastegate Stuck Open Symptoms?Continue, Oops! In the 106 LSA, the engine can reach the maximum torque, making the driving more efficient and saving energy. If you drew a line that divided the intake lobe in half right at the point of maximum lift, then did the same to the exhaust lobe, then measured the distance in cam degrees between the two, that would be the lobe separation angle. I don't think your duration figures are too outlandish and with the tight LCA and high lift, it should make some big torque. The 234o duration kind of eliminates the RV usage. 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. Lobe Seperation | Ford Muscle Cars Tech Forum VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Equipped with the 120-degree (LSA) cam, the hybrid stroker produced 570 hp at 6,200 rpm and 535 lb-ft of torque at 5,200 rpm. I have Crane hydraulic link bar style roller lifters, so I dont have to use the spider style. 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 takeaway is simple on the surface: A tighter LSA makes more low-end and peak torque at the expense of just a few top-end ponies. Come here to talk with others who like to drive fast. But for small-block Chevys (like the LS applications in this story), the LSA is ground into the cam. Frontal lobe epilepsy (FLE), the second most common focal epilepsy syndrome after temporal lobe epilepsy (TLE), is frequently drug-resistant and MRI-negative. 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. I bet you won't see a bit of difference. The 112-degree cam produced peak numbers of 567 hp at 6,200 rpm and 540 lb-ft of torque while pumping out 511 lb-ft of torque at 4,000 rpm. So, which is better? 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. The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. If the cylinder heads are the lungs of an engine, the camshaft is the brain. Now its not shifting into 3rd and you are here. 108 Lobe Separation These are my motors specs 1979 - 347 Stroker 10:1 Compression Holley 670 Street Avenger or a Holley 650 (I have both) Roush 200 Cylinder Heads (minor head work) 1.6 Roller Rockers Shorty BBK Headers 373 Rear End 5 Speed Transmission Cross Gap Intake (Power Band 1500-6500) FlowMaster Dual Exhaust (of course no Cats) MSD 6Al Split duration/lift only helps when your intake/exhaust ratio is low on the exhaust side. NOTE: Classic Inlines stocks the above profiles in 108, 110, and 112 lobe centers. by flat4racer17 Mon May 12, 2003 1:40 pm, Post The ported heads were capable of supporting over 700 hp, so we knew they would not be restrictive on our stroker. A cam with 110 lobe center will pull approximately 14-18"of vacuum is borderline for that type of application. These favorable mechanical features depict the powerful acceleration capacity of the engine with higher oil and energy consumption rate, overheating problems, and other mechanical problems. True enough, the tight LSA improved power through the entire rev range, from 3,600 to 6,500 rpm, but the extra power came with a penalty in idle quality. The lobe separation angle or LSA is the angle in camshaft degrees between the maximum lift points, or centerlines, of the intake and exhaust lobes. Because during the lower units oil change, you can go through the issue that the lower plug, Read More Yamaha Lower Unit Drain Plug Size [Explained Everything]Continue, Among the crucial parts of a vehicle ignition system is the ignition coil, also called a spark coil. As a result of this fall, the idle of the engine has to face suffering quite often. What happens when you change ONLY. 112-110 Deg. Unfortunately, good street manners are often at odds with performance, as wilder cam timing usually decreases idle and (low-speed) driveability. This table will create a map in your head, and I bet it will make your understanding crystal clear. Anybody do any real testing on LSA in a 3.75 stroke small block chevy?I have always used 104-106 and was thinking about trying a 108 or 110 design.I know there is a lot of variables but just a general opinion from any experts.This is for motor only no nitrous.600-640 HP engine combos.Much appreciated! In general, a stock replacement camshaft with duration of less than 200 degrees will have a lobe separation angle of more than 114 degrees. 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. Compression willl be 9.75:1. The 402 was run with a FAST LSXR LS3 intake and matching 102mm throttle body along with stock LS3 rockers, a Holley HP management system and 7.4-inch hardened pushrods (from Comp Cams). Overlap is the amount of time that both valves are open in the same cylinder. Good luck. 106 lobe sep. in a street car. | NastyZ28.com But, the narrow or broad powerband choice varies from person to person. The result sounded wonderful, but it didnt rev as enthusiastically and it made 30 less horsepower than normal, says Lawrence. 110 LSA: Oppositely, the cylinder pressure is comparatively lower at 110 LSA than at 106 LSA. All three terms are similar, as they all relate to the relationship between the centerline of the Intake lobe and the centerline of the Exhaust lobe. 108 is very tight producing lower vacuum and more of a 2 stroke "punch" powerband. 114 vs 110 lobe sep. on cam | NastyZ28.com Epilepsy is a chronic noncommunicable brain (neurological) disorder associated with excessive neuronal activity and unprovoked seizures referred to as 'epileptic seizures' and sensory-motor deficits that cause neurobiological, cognitive, psychological, and social consequences to the patient.