108 vs 110 lobe separation

A cam with a 112 lobe center will idle smoother than a cam with a 110 lobe center. i think a little more torque will be good for my car.With the XE274 it was a little slugish until around 3000 rpms. Most cars use more than, Read More Does It Matter Which Ignition Coil Goes Where? But it is a piece of good news for your engine. It's the scavenging effect of the high velocity exhaust gases rushing out that pulls the fresh fuel/air charge into the chamber. Maybe even 114. Tight lobe separations, such as 108 or shorter, will cause the peak torque to build earlier in the RPM range and peak-out in a short amount of . Unfortunately, good street manners are often at odds with performance, as wilder cam timing usually decreases idle and (low-speed) driveability. 05 To ensure our stroker combo had sufficient airflow, we installed a set of Chevrolet Performance CNC-ported LS3 heads from Gandrud Chevrolet. 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. Ultimately, it comes down to how you want the engine to run, the car's intended purpose, and what you are willing to tolerate. A lower efficient compression rate leads to a higher fuel consumption rate by your engine to produce higher power. any input is appreciated guys, thanks. JavaScript is disabled. It is the DESIGNED events that yield CENTERLINE. 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. A 112-114 degree lobe center will have a better idle and produce more vacuum with less overlap. Idle vacuum showed a considerable spike to 14.7 in-Hg, likely the difference between being able to run power brakes and a mandatory leg workout. 106 LSA: There is a scale of standard cranking compression of the engine. Howards Cam Vs Comp Cam: Which Is The Best Option For You? I just bought a 86b Webcam and Im using 1.5's. Another important measurement was the torque production at 4,000 rpm and this cam checked in with 484 lb-ft of torque. LSA is a result of valve timing events. Ultimately, it makes the 110 LSA an oil-consuming LSA. 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. Given that nitrous works best in the mid- to upper-rpm range, nitrous-powered engines need a wider lobe separation, like 112 . As you tighten the centers ( 108 ) the same engine will make MORE power through the mide range and top end. However, in application, there is a lot more to consider. The extra cubic inches will smooth out a rough idle in a 327. by SStrokerAce Sat Dec 06, 2008 7:38 pm, Post Knife edged & profiled 4MA Cleveland crank weighing 50lbs. So, choose the perfect lobe separation angle for your engine, complying with the requirements of your needs. Yearh, I have been reading a lot about this issue. 110 LSA: On the other hand, 110 LSA is a wider LSA with almost no overlap. On engines equipped with independent intake and exhaust cams, the LSA is adjustable. If it occurs too late, it will lean out the cylinder and greatly hinder the performance of the engine. 13 The three power curves indicate that the wide (120-degree) LSA (green lines) lost considerable torque to the other two cams. 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. That notion is completely false. by jim martin Mon May 12, 2003 7:10 pm, Post The stock valvesprings supplied with the CNC LS3 heads were swapped out in favor of a set of dual springs from Brian Tooley Racing. I have 108 for LSA and my headlights take awhile to go up when the car is idling. After consulting with many experts, you are still in confusion between 106 and 110- lobe separation angles. Here are the basics: higher lift values open the valves to increase airflow and longer duration keeps the valves open longer. All testing was performed with an Aeromotive fuel pump feeding a set of 42-lb/hr injectors. However, it is fixable. I would have to say that your cam choice sounds like a winner to me. He also enjoys reading books a lot and his favorite author is Paula Coelho. I wouldn't assume 4 links fuel requirements will mirror yours at all. 68 Mustang, 306, AFR 185\'s, CI cam, FPA\'s, Bigs 650 DP, T5Z, 9" w/4.33's. Is There a Sequence? At a lower LSA, the engine reaches the peak of the torque earlier than the standard time but generates a lower RPM.On the contrary, at a higher LSA, the engine reaches the peak torque at a higher resistance level and generates a bulk number of RPM. 110 LSA: But here, quite surprisingly, you have to face the reduction of the EGR effect due to the 110 LSA. 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. For a better experience, please enable JavaScript in your browser before proceeding. It is dangerous to be right in matters on which the established authorities are wrong. If you take any of the . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. So, without wasting any moment, lets find out the answer. Simply put, the lobe center of the camshaft controls where the power curve is applied. Now that we have a basic understanding of lobe separation angle, we can put together a test to illustrate just what happens when you make changes to it. It is the angle that separates the intake and exhaust lobe for a particular cylinder, and is measured in camshaft degrees. The engine would idle a lot rougher and generate worse exhaust emissions largely because of unburned fuel.. The only reason I . How To Properly Replace Ignition CoilsContinue. 108 versus 110 will drive the power band down. Getting back to the sound of an engine, its no secret that a raucous, lumpy idle is often preferred by street cruisers, regardless of the ill manners and inefficiency of such an engine setup. 292S-112: 292/292 - 240/240 - .495/.495 - 112* - 3400-7200. But there is a drawback of higher cylinder pressure: higher cylinder pressure may sometimes lead to piston or piston ring problems. If all the specs remained the same what will going from a 110 to a 112 lsa do to driving characteristics? Enter lobe separation angle. Tuning this cam would be slightly more difficult due to the reduced idle vacuum, but it is hard to argue with all the extra power. If the overlap phase occurs too early, it will create an overly rich condition in the exhaust port, severely decreasing the gas mileage. by 3V Performance Sat Dec 06, 2008 4:38 pm, Post Realize what the engine is going in, however, as you may not be able to use the wildest cam out there. = Moderately Tight 106-104 Deg. 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.. This cam split the difference between the 101 and 113 down the middle, and in theory should have walked the line between the results of the last two tests in every waywhich it did. It will also give you a smoother idle and probably even better gas mileage. Like choosing a cam in general, the key to eliminating separation anxiety is to find the proper balance of driveability and performance. I've seen that Webcam cams can be ordered with either of the above. 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. As you can see in the graph, the 101 LSA cam actually had the highest cranking compression of the batch: 185 psi. This is one of the many reasons why Clay Smith Cams always recommends degreeing your camshaft in using the Lobe Center Method. 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 -. Lobe seperation cant be seperated from duration,the 2 are connected.the old duntov cam had a lot less duration than many new cams so the valve overlap was not extreme and the engine ran with a gentle lope.Increase the duration by 20* and this cam would shake a 283 out of the car at idle,but then increase the lobe seperation by 4* and the motor will have a gentle lope again. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I probably would have gone with 3.55 gears had I knows better.. 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. If you shift at 7500-7800 add 4-6 degrees to both intake and exhaust and spread the lobe separation to 108-110. Noah knows a lot about whats happening in the car industry with the latest piloting productions thanks to his professional experience. The 110 is probably a better choice for a performance street engine. Before getting to the cam profiles, we had to make sure we had a reasonable test engine. by ANT Tue May 13, 2003 1:08 pm, Post 106 LSA: On the contrary, if we look at the 106 LSA, we will find it more advantageous and energy efficient than the 110 LSA 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. Re: Lobe separations on 383-406 cids.104-106-108-110. The 112-degree cam (red lines) picked up much of the torque, but the big winner was the cam with the tightest lobe separation angle. Do you like to go fast? Part Number: HRS-CL120325-08. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The higher the compression and the higher you try and rev it, the more it will like a wider lobe center. Only once the intake valve has closed can compression begin to build. 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. Nitrous engines, which make plenty of power and torque, often run wide lobe separation angles to moderate cylinder pressures and temperatures. 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. As usual, Marc (aka Master) is correct. O onovakind67 Registered Joined Dec 14, 2001 6,242 Posts In reality, a cam with 220 at 0.050" and a lobe center angle of 112 will have the exact same mechanical overlap as a cam with 217 at 0.050" and a lobe center angle of 109. On the cranking compression test, Brul recorded 175 psi, a 10-psi drop from the outgoing 101 cam. 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. I don't think your duration figures are too outlandish and with the tight LCA and high lift, it should make some big torque. If you compared these two cams side by side in identical engines, the first cam would actually have a slightly better idle and would produce slightly more peak power at upper RPM's. 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. Also know as Lobe Separation; Lobe Center is simply the distance between the peak opening points on the Intake and Exhaust lobes. JavaScript is disabled. Higher lift and longer duration profiles add power, but do so at higher engine speeds (especially true of duration). No, it is not even close to the ultimate performance grind most would have picked. And better gas mileage. The final cam was tighter still, with a 108-degree LSA. 2.1.2.4.2 Side-lobe suppression shall be provided in accordance with the provisions of 3.1.2.1.5.2.1 on all Mode S-only all-call interrogations. Engine builders Chuck Lawrence, left, and Doug Patton. You cannot look at just the LCA without looking at other specs too. 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. Cam timing plays an important role not only in the power generated but also the overall character of the powerplant. 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. Things like idle vacuum, fuel economy, and tuning all factor into picking the right cam. This form of short-term memory is supported by the prefrontal cortex (PFC) and is believed to rely on the ability of selectively tuned pyramidal neuron networks to persist in firing even after a to-be-remembered stimulus is removed from the environment. This is very critical for manifold vacuum, throttle response, emissions, and gas mileage. 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. The taller lobe seperation will have a longer powerband but will have to rev higher to make the power than the lower lobe seperation!

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