That is no accident. In terms of horsepower, the disparity between all three cams was only 6.5 hp, with a scant 100 rpm separating the peaks. What happens when you change ONLY. 1-4 It is one of the most common neurological disorders worldwide, 1-5 is among the most common . These numbers can vary a few inches one way or the other, depending on several other aftermarket factors and your individual engine specifications, so you may want to check your vacuum once the cam is installed. by SStrokerAce Sat Dec 06, 2008 7:38 pm, Post somthing to that aspect. But, after comparing these two LSA based on a few mechanical aspects, such as maximum Torque, RPM, powerband, oil consumption, and many more, you will find the 106 LSA with better performance output. 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. This is ground into the cam and can't be changed without changing cams. Typically, narrower lobe separation develops peak torque at lower rpm and widening the separation tends to build peak torque higher in the rpm range. The 114 cam will give more low end torque, good midrange, less power up high. If a street car has smaller lift and duration numbers, they might run 112 or 114. You can modify the lobe center a little bit but not enough to change the actual overlap of the grind. Really wide lobe separation angles are used in boosted applications. Simply put, both 106 and 110 lobe separation angles have many advantages and disadvantages. Many later model engines use wide lobe separation angles to reduce overlap for idle quality and fuel economy. But, at 106 LSA, the cranking compression may increase above the standard PSI level. ( 2 ) Estimated Ship Date: Feb 23, 2023 (if ordered today) Drop Ship. 110 LSA: On the contrary, it is pretty unpleasant to inform you that the efficient compression rate decreases at 110 LSA. And better gas mileage. 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. It also depends on what the vehicle will be used for and if economy and vacuum are important. by ANT Thu May 15, 2003 6:44 pm, Copyright 2022, S&S Motorsports LLC, All Rights Reserved - Powered by phpBB Forum Software phpBB Limited. A wider LSA moves intake- and exhaust-valve events farther apart and creates less overlap, which hurts intake-wave tuning. As you can see in the graph, the 101 LSA cam actually had the highest cranking compression of the batch: 185 psi. As the RPM's go up this is not as critical as the higher velocity of the air/fuel moving thru keeps it from getting contaminated. Professionally ported & polished iron 4V head with titanium intake valves, stainless exhaust, titanium retainers & keepers & dual springs. 106 LSA: There is a scale of standard cranking compression of the engine. 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. To demonstrate changes to lobe separation in action, we ordered three camshafts from Comp Cams, all ground with identical lift (0.541 intake and 0.537 exhaust) and duration (230 intake and 236 exhaust) but with three different LSAs: a 101, a 107, and a 113. 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. I bet you won't see a bit of difference. 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.. It had a robust powerband with tons of usable torque. The valve covers, valvetrain, intake manifold, harmonic balancer, front cover, timing set, and cam were yanked. Like choosing a cam in general, the key to eliminating separation anxiety is to find the proper balance of driveability and performance. indeed, expect low vacuum with anything lower than 110-ish. I would have to say that your cam choice sounds like a winner to me. The Idles increasing vacuum improves the idle quality and the engines overall performance. 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. Enter lobe separation angle. 15,215. ohio. 4-linked72, what cam are you using that has a 108 LSA? Well get out of that stocker and build a hipo motor for your VW. But remember, although a broader powerband has a couple of acceleration advantages, it also comes with a few drawbacks. "When you've properly tuned a performance motor, you create high- and low-pressure waves in the intake and exhaust that help cylinder filling," said Comp Cams' Billy Godbold. Good cam for a lower rpm street engine. In a blower motor when the valve timing events are where they need to be the lobe sep will usually wind up in the 114-115 range on most Combos. Tight LSA cams make excellent low-end torque and have a beautiful power curve. 106 LSA: You can see an increasing EGR effect at 106 LSA. So, the 110 LSA engine is a suitable choice for people prone to be the fan of a powerful engine with mighty acceleration power. The tighter the lobe center, the lower the RPM range; the wider the lobe center, the higher the RPM range. The wider lobe separation angle closes the intake valve later and reduces cylinder pressure, so that is where it's detonation resistance comes from. 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 tighter the lobe separation angle, the peakier the power curve will be, confirms Bolander. If you look at the cam card, you will find a maximum lift column on the card.Now, all you have to do is, add up the two mentioned maximum angles and divide the summation by 2. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. These issues can often be worked through by an advanced tuner, but always present a challenge and compromise in tuning strategy. For large port heads like the CNC 044's which can use the extra lift 1.4's make a noticable difference. But it is a piece of good news for your engine. Frankly cams with a 108-114 lca unless in the perfect combo you won't usually see more than 15hp and you won't really feel the difference except for either a peaky or broad power band. To establish the position of each lobe, the traditional reference point is where the lobes reach max lift. Do you like to go fast? 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. by Kdub Sun Dec 07, 2008 1:20 am, Post If you take any of the . If two cams are identical with the exception of lobe separation angle (we'll say 108 and 114) the cam with 114LSA will make more low end power than the 108LSA cam? Lobe separation angle does. On the cranking. 110 will be a bit punchier in the midrange and probalby make a little more peak horsepower as long as a good exhaust is used. According to the Motortrend, LSA (Lobe Separation Angle) is a wonderful approximation of the operation of the engine because it takes into account the relative time of the intake-valve events (intake opening, intake closing) and the exhaust-valve events (exhaust opening, exhaust closing) concerning each other.Above mentioned sequential activities allow LSA to be an accurate representation of the operation of the engine. 106 LSA: The scale of efficient compression rises at 106 LSA. Also know as Lobe Separation; Lobe Center is simply the distance between the peak opening points on the Intake and Exhaust lobes. I do believe that stock VW seperation is 108 and 112 is used alot in turbo and midrange cams for VW's while 106 is used for the top end cams. But, you may find it quite shocking that the piston-to-valve clearances decreasing rate raises the chance of damaging the valve by the piston. . Mechanical aspects like maximum torque, narrower powerband, higher cranking compression rate, efficient compression rate, effective EGR effect, and lower oil consumption rate increase the car engines efficiency and make it energy efficient. 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. hydraboost is the same as a vacuum brakebooster, only the booster is replaced by a unit that does the same but under hydraulic pressure. I also like the 106 lobe separation with the intake on 103. However, a cam with 108 will only pull 12-16", which is not enough for power assisted accessories. When you don't have any overlap, you can't have any wave tuning. The 30-30 Duntov is on the high end of the duration recommendation. Aeromotive; 913.647.7300; AeromotiveInc.com, AFR Heads; 661.257.8124; AirFlowResearch.com, Federal Mogul/Felpro; 248.354.7700; FederalMogul.com, Mahle; 248.347.9700; Mahle-Aftermarket.com, Scat Enterprises; 310.370.5501 ScatEnterprises.com, SuperFlow Dynamometers and Flow Benches; 515.254.1654; SuperFlow.com. 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. Maybe even 114. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! I personally prefer to sacrifice the small amount more power for better idle quality. Part Number: HRS-CL120325-08. The second cam would have a rougher idle, produce more torque and would rev quicker. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! On a naturally aspirated engine, the lobe separation angle has an effect on whether the engine reaches peak torque a little earlier or later in the rpm range. I have Crane hydraulic link bar style roller lifters, so I dont have to use the spider style. The 108-degree cam offered both the most power and torque, but idle quality suffered compared to the wider LSAs. If all the specs remained the same what will going from a 110 to a 112 lsa do to driving characteristics? Another important measurement was the torque production at 4,000 rpm and this cam checked in with 484 lb-ft of torque. i think a little more torque will be good for my car.With the XE274 it was a little slugish until around 3000 rpms. If the intake valve opens too early, it will push the new charge into the intake manifold. I'm surprized at these questions as well as some of the replies. " Realize what the engine is going in, however, as you may not be able to use the wildest cam out there. Contrariwise, 106 LSA car engines are the best choice for people seeking energy-efficient cars with moderate engine power. My duration will be about 230 degrees. After consulting with many experts, you are still in confusion between 106 and 110- lobe separation angles. It affects the amount of valve overlap; that is the brief period of time when both the intake and exhaust valves are open.. LSA CAM TEST-108 vs 112 vs 120 Richard Holdener 239K subscribers 168K views 2 years ago WESTECH PERFORMANCE GROUP FULL RESULTS-CHANGE ONLY LSA-LS CAM TEST. On the surface, the camshaft's job is simpleopen and close the valvesbut beyond that topical description, it's one of the most mysterious and misunderstood engine components. It a 355. thanks in advance. Frontal lobe epilepsy (FLE), the second most common focal epilepsy syndrome after temporal lobe epilepsy (TLE), is frequently drug-resistant and MRI-negative. Good luck. 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. A forum community dedicated to Ford performance owners and enthusiasts. 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. on average with a N/A motor if you stick the two cams in at the track the tighter lsa will be faster at the expense of idle quality. For Example: A 110-degree lobe separation means that the peak opening points of the Intake and Exhaust lobes is 110 degrees apart. A cam with a 112 lobe center will idle smoother than a cam with a 110 lobe center. *If you do not have enough vacuum, you can in some cases install a vacuum canister or reservoir, which works by storing the peak vacuum in the reservoir. by trmnatr Sat Dec 06, 2008 10:45 pm, Post The Wastegate works by releasing the pressure built inside, Read More What Are The Wastegate Stuck Open Symptoms?Continue, Oops! Is it a hydraulic roller as well? Whatever you do, stay under 270 advertised duration and shoot for a 110 lobe separation. However, it is fixable. In the 106 LSA, the engine can reach the maximum torque, making the driving more efficient and saving energy. For your convenience, I am providing a comparison table to give you an overall idea about the comparison. 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 -. If the exhaust valve closes too early it will trap some of the spent gases in the combustion chamber, and if it closes too late it will over-scavenge the chamber and take out too much of the charge, again creating an artificially lean condition. The 114o lobe will add a lot more vacuum at idle. 238/248 duration, 300/310 adv. The final cam was tighter still, with a 108-degree LSA. Lobe sepsration is an advanced description for overlap.If you take a cam on a 112,and grind it on a 108,you add more overlap,the time the valves are both open.Narrower lobe centers mean more low end and midrange torque,along with a peakier powerband,and a slightly rougher idle.Tradeoffs are sensitivity to octane ratings,total timing, and air fuel ratio.A lot to swallow I know,hope this helps you. You get a better idle, vacuum, and response from a 112o-114o lobe. While most of our customers know what lift and duration are, most are unfamiliar with the term Lobe Center and how it affects the engines performance. They also reduce stress on the outdrive. But i would nt go any wider than 110. It provides a spark plug with the high voltage needed for combustion. Torsion Beam Vs Multi Link: Who Wins the Battle? 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. Higher lift and longer duration profiles add power, but do so at higher engine speeds (especially true of duration). So, which is better? Pinning the tail on the perfect cam can certainly be a difficult task. We will safeguard your e-mail and only send content you request. The LSA, or lobe separation angle, is ground into the cam and cannot be changed. by farmer Mon May 12, 2003 3:14 pm, Post i have a 4 bolt 351C, stock bore, 10.5 cr with 351C Boss heads ,boss crank and rods. . Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! The same is true for intake valve closing. 106 LSA: So, if I talk about the powerband at 106 LSA, the powerband is narrow. Chuck Lawrence of Jon Kaase Racing Engines was asked to give a 520ci BBF a Pro Stock sound, so he went with a 108 LSA in place of a more conventional 112 LSA. This recommendation is only if you shift at no more than 7000. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. also,, wider will produce a wider and more flat torque curve that doesn't fall off as abruptly up top rpms. A forum community dedicated to vintage Ford Mustang owners and enthusiasts.