108 vs 110 lobe separation

This overlapping has a direct influence on the oil consumption rate of the engine. 110 LSA: However, if you look at the rate of cranking compression at 110 LSA, you will find a reduced compression rate from the standard cranking compression PSI level. 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. As a result, you can enjoy a pleasing engine outcome. Depending on the engine combination, the opposite results can occur. The lobe separation angle is a comprise of what the engine needs depending on the compression, combustion chamber, rpm, engine size, head volume, and many, many other variables. 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. LSA is a way of summing up the relative timing of the intake-valve events (intake opening, intake closing) to the exhaust-valve events (exhaust opening, exhaust closing) in relation to each other, and it's a great approximation of how the engine will operate. Let's just talk lobe sep angle. In terms of horsepower, the disparity between all three cams was only 6.5 hp, with a scant 100 rpm separating the peaks. Changing the lobe separation angle changes the amount of overlap that exists during the time the intake and exhaust valves are both open, echoes Doug Patton of Pro Line Race Engines. I'd run it, just be sure to check valve to piston clearance, coil bind and retainer to guide boss/seal clearance. 110 LSA: On the other hand, 110 LSA is comparatively a wider LSA; it can generate a massive amount of RPM for the engine. Thanks. The same is true for intake valve closing. What Are The Wastegate Stuck Open Symptoms? The only reason the advance or retard a camshaft profile is to get the timing events where they need to be. It is the average centerline between both lobes and expressed in degrees ranging from 95 on the extremely narrow/tight side to upward of 120 on the wide end. But, at 106 LSA, the cranking compression may increase above the standard PSI level. LCA (lobe center angle) vs LSA (lobe seperation angle) Lobe Separation Angle - Restoration and Repair Help The lobe separation angle in a natural car engine conveys a considerable impact, especially regarding the maximum torque. The balance of midrange torque and top-end horsepower lends this LSA range to the majority of street/strip engines. probably just enough to get me in trouble.. Before we all start suffering from separation anxiety, we need to understand what lobe separation angle actually is and then how it affects your engine. This is ground into the cam and can't be changed without changing cams. by ANT Tue May 13, 2003 1:08 pm, Post Build your own custom newsletter with the content you love from EngineLabs, directly to your inbox, absolutely FREE! = Moderate 108-106 Deg. Yeah but do the experiment on the dyno and tell me your intuition is correct. 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. Is it a hydraulic roller as well? Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. [img]http://i67.photobucket.com/albums/h291/downsideup09/DSCF2616-1.jpg[/img], [img]http://photos-g.ak.fbcdn.net/hphotos-ak-snc1/hs139.snc1/5928_111214857139_110806152139_2127222_6826389_n.jpg[/img]. I believe you have got the idea of what you were seeking. Now here is where it gets tricky. 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 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. That means your engine can produce more power with a minimum amount of fuel combustion. 03 The 4.000-inch crank and 6.125-inch rods were combined with a set of forged asymmetrical pistons from JE. Hopefully It will do fine in my 2276 mostly drag bug. Cylinder-head flow and LSA are directly related: as a rule of thumb, the better the head flows, the wider the LSA can be. Coupled that with the low first gear of the five speed, it ought to create some real traction problems. thanks. I just bought a 86b Webcam and Im using 1.5's. Changing lobe seperation from 110 to 112-14? | For B Bodies Only 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 So, now you, Read More Chevy Transmission Wont Shift Into 3rd: Finding the Main CulpritContinue, While changing the oil on your boats lower unit, you may need to change the drain plug, too. I normally run a 106 to a 108 because I like the "hit" a tighter LC cam has when it come up on the came. As a result of this fall, the idle of the engine has to face suffering quite often. 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. Whatever you do, stay under 270 advertised duration and shoot for a 110 lobe separation. its got a 3.73 posi and the Stock 4 speed with a very low 3.42 1st gear. 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. Fixing the ignition coils is essential when you experience issues like engine misfire and the Check Engine light that wont go off. 108 is very tight producing lower vacuum and more of a 2 stroke "punch" powerband. BUT, 114 will have more vacuum at idle, which will work better with some fuelinjection. It will sound lovely I'm sure. A cam's lobe separation determines where and for how long peak torque occurs in an engine's rpm range. Well, I saw that Erson makes some nice hydraulic rollers with 108 LSAs, and I know that tighter LSAs have more midrange, so I thought they might be worth a try. 2023 Power Automedia. A wider LSA moves intake- and exhaust-valve events farther apart and creates less overlap, which hurts intake-wave tuning. On a torque graph it tends to resemble a triangular shape.. 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. It's wet flow tested at 690cfm. so the power will come on a litter sooner with the 114, and fall off a little sooner? 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. Copyright 2022, S&S Motorsports LLC, All Rights Reserved - Powered by, http://www.webcamshafts.com/cam_glossary.html, http://www.newcovenant.com/speedcrafter haft/3.htm, Webcam 86A 108LC w/1.5 vs 86B 112LC w/1.3s. But for small-block Chevys (like the LS applications in this story), the LSA is ground into the cam. 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. Post (You can find an instructional video of how to do just that on our Clay Smith Cams YouTube Channel;https://www.youtube.com/watch?v=57gfBu8uc6k&t=1s ). 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! This has been my long time understanding! Engine knocking generally occurs when the burning of the fuel by the engine is uneven. JavaScript is disabled. 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 -. The engine has AFR heads, Crane rockers, a TCI balancer, a Scat Rotating assembly with Mahle pistons, an Edelbrock RPM Air-Gap intake, an MSD ignition, and an Aeromotive fuel system. I had a 110 cam in my beetle and I didn't like it-the bottom end was doggy. 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. The other thing is that you need to tune your ignition advance to maximize your performance. You get a better idle, vacuum, and response from a 112o-114o lobe. Simply put, both 106 and 110 lobe separation angles have many advantages and disadvantages. Valve lift will bear weight in any decision regarding LSA. Lobe Separation Angle 110 Vs 112 - Truck Guider While a cam with a 108 lobe center will idle rougher. If that accessory still does not assist the cam in producing enough vacuum, then as a last resort you can use a vacuum pump. 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). Higher lift and longer duration profiles add power, but do so at higher engine speeds (especially true of duration). 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. Required fields are marked *. 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. 4-Link72, do you run racing gas or pump with 10.5:1 CR? what to expect with different lobe centers | Chevy Nova Forum Has anybody experienced it/ tried it? O onovakind67 Registered Joined Dec 14, 2001 6,242 Posts by lazaris Fri Dec 12, 2008 2:18 pm, Post The Wastegate works by releasing the pressure built inside, Read More What Are The Wastegate Stuck Open Symptoms?Continue, Oops! I have seen a dyno test where an engine using identical duration and lift made more peak power with a 112 LSA than a 110 LSA. 106 LSA: At this LSA, the car machine has to confront the reduction of idle vacuum rate quite often. The 114 LSA is good for a blower or nitros motor. Maybe even 114. music to your ears? Disorganization of language and working memory systems in frontal 110 LSA: On the contrary, 110LSA has a higher piston-to-valve clearance rate. This wave tuning is what helps performance engines achieve volumetric efficiencies of more than 100 percent. I've heard similar cams (only about 5*'s off) and they have a nice rumble to them. Compression willl be 9.75:1. LSA is the distance from the centerline of the intake lobe to the centerline of exhaust lobe. So, this LSA is suitable for your engine and its components. Increased Effective Connectivity of the Left Parietal Lobe During Nothing makes mouths drop like a car that sounds and looks like it can't keep it self still! 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. The ported heads were capable of supporting over 700 hp, so we knew they would not be restrictive on our stroker. Also If you go with 112 lobe centers, you create less valve overlap which will increase your compretion. It made 472.4 lb-ft at peak, a 21.5lb-ft disparity from the 101 cam. The Idles increasing vacuum improves the idle quality and the engines overall performance. A lower efficient compression rate leads to a higher fuel consumption rate by your engine to produce higher power. But you always have a cam card with the engine. 238/248 duration, 300/310 adv. Going from a 110 to 112 lobe separtaion - Ford Muscle Cars Tech Forum We will safeguard your e-mail and only send content you request. Thats just the way the customer wants to roll, and engine builders find its easy to deliver such a powerplant. Widening their separation angle helps increase upper rpm power output. 110 LSA: But here, quite surprisingly, you have to face the reduction of the EGR effect due to the 110 LSA. I have used some cut on a 110 that worked well too, but they never sounded as good as the tight ones. Lobe Separation or Lobe Centers is another way of expressing the Valve Overlap, which was the term formerly used by cam manufacturers before industry standard verbiage changed. such as 290 @.050? The 30-30 Duntov is on the high end of the duration recommendation. While lift and duration are most often discussed when talk turns to cam timing, there is a third variable that has a decided effect on both power and personality. My duration will be about 230 degrees. The absence of engine knocking ensures that your car engine is reasonably combusting the fuel. This is very critical for manifold vacuum, throttle response, emissions, and gas mileage. by flat4racer17 Tue May 13, 2003 9:12 pm, Post I am trying to pick out a hydraulic roller cam for my 351W with AFR 185s. i've heard of this being done something about the massive amounts of duration allowes gasses to disipate? so it is a solid flat tappet, torker intake, 1" 4-hole tapered spacer and 750 carb (QFT) transmission is a wide ratio toploader, rear is a 9" 3.89 geared 26"rear tires. Well, it is quite a natural event that you may not find the lope separation angle mentioned at the engine body. The 114 cam will give more low end torque, good midrange, less power up high. 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. But it is a piece of good news for your engine. Before getting to the cam profiles, we had to make sure we had a reasonable test engine.

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