View Poll Results: F-13 Cam 112 vs. 114 LSA
112 LSA Provides peak power earlier in the powerband
184
75.72%
114 LSA Provides peak power earlier in the powerband
59
24.28%
Voters: 243. You may not vote on this poll
112 vs 114 LSA - Difference?
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From: Charlottesville, VA
112 vs 114 LSA - Difference? My buddies are arguing over what the difference is between 112 and 114 LSA on the F-13 Cam. One says that the 112 makes its power lower in the powerband, and the other one is arguing with him. Which is it?
If you have a cam with exactly the same specs except for the 112 vs 114 LSA, which one makes its power earlier / later in the powerband? What are the differences and advantages and dissadvantages of these two different LSA's on the same cam?
Thanks guys, there is money riding on this so please be accurate!
If you have a cam with exactly the same specs except for the 112 vs 114 LSA, which one makes its power earlier / later in the powerband? What are the differences and advantages and dissadvantages of these two different LSA's on the same cam?
Thanks guys, there is money riding on this so please be accurate!
Thread Starter
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From: Charlottesville, VA
Is there any administrators of this board that can post up an answer? This isnt really proving anything yet. I just want to know if 112 LSA Peaks before or after the 114 LSA.
Its not as simple as you make it out to be. Given everything else being the same the 112 will peak a little harder (higher) but at a higher RPM, and the 114 will have a flatter powerband and peak a little lower. The biggest difference is the shape of the powercurve not the place it peaks. 
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Launching!
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From: California
Originally Posted by KCFormula
Its not as simple as you make it out to be. Given everything else being the same the 112 will peak a little harder (higher) but at a higher RPM, and the 114 will have a flatter powerband and peak a little lower. The biggest difference is the shape of the powercurve not the place it peaks.
Or in other words how much Hp am i missing out on by getting the 114 instead of the 112?
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If you take a look to this site, you will get a much more clear answer, and that way you will be able to answer yourself based on your own judgment:
http://www.compcams.com/Technical/TimingTutorial/
Nice page.
IMO, as long as you have a good set of headers, and a good intake, the less important the LSA angle will be
Take a look to that page.
http://www.compcams.com/Technical/TimingTutorial/
Nice page.
IMO, as long as you have a good set of headers, and a good intake, the less important the LSA angle will be
Take a look to that page.
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112=earlier peaky powerband
114=broader higher powerband and higher ultimate horsepower-and easier to tune on average....at least I found that to be the case.
Both assumed to be in the same motor.
Lower lobe separation is a fix for limited rpm use. The 114 is the better choice if you can rev to where the power is but the lower end would benefit more from gearing. You choose the cam specs based on your engines rpm range and application. If you have an A4 that is shifting at 6200 you need a cam that is in that power band and not one that pulls to 7100. Installing any cam a few degrees advanced retards the power band and installing it retarded advances the band. (adjustable timing gear set needed.)
I'm sure one of the regulars will post a long cut and paste answer but I think that covered your question.
114=broader higher powerband and higher ultimate horsepower-and easier to tune on average....at least I found that to be the case.
Both assumed to be in the same motor.
Lower lobe separation is a fix for limited rpm use. The 114 is the better choice if you can rev to where the power is but the lower end would benefit more from gearing. You choose the cam specs based on your engines rpm range and application. If you have an A4 that is shifting at 6200 you need a cam that is in that power band and not one that pulls to 7100. Installing any cam a few degrees advanced retards the power band and installing it retarded advances the band. (adjustable timing gear set needed.)
I'm sure one of the regulars will post a long cut and paste answer but I think that covered your question.
112 does peak earlier, but the 114 has a broader power band which may make the cam feel like its making more power down low and therefor give the impression that it peaks lower. It does not.
im no expert either, but from all i have read:
112, rougher idle, peaks earlier, more suited for manuals
114, smoother idle, peaks later, more for autos
some even go lower, i talked to someone with a 108 in their car that they took on most of if not the whole power tour(think it was VSGLS1)
better yet, PM ANY of the sponsors that sell cams, they can tell you the answer for sure. Allan at Futral really knows his stuff, he might be a good one to talk to.
112, rougher idle, peaks earlier, more suited for manuals
114, smoother idle, peaks later, more for autos
some even go lower, i talked to someone with a 108 in their car that they took on most of if not the whole power tour(think it was VSGLS1)
better yet, PM ANY of the sponsors that sell cams, they can tell you the answer for sure. Allan at Futral really knows his stuff, he might be a good one to talk to.
from what i have been told, generally if all specs are the same the lower LSA will peak earlier and make a few more HP. but i have the FMS13 in my car and it is on a 111 LSA with +1 timing built in. it peaked at 6800rpm. my car is a 6 spd and the only other power mods it has is lid/K&N, flp headers, 3" y-pipe with hi-flow cats, and borla exhaust and it dynoed 393rwhp@6800 after being tuned. the tuner set the rev limiter at 6800 since i am on a stock bottom end and dont want to run the motor too high in the RPM's.
Launching!
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From: longview, tx
Originally Posted by Smartass6885
from what i have been told, generally if all specs are the same the lower LSA will peak earlier and make a few more HP. but i have the FMS13 in my car and it is on a 111 LSA with +1 timing built in. it peaked at 6800rpm. my car is a 6 spd and the only other power mods it has is lid/K&N, flp headers, 3" y-pipe with hi-flow cats, and borla exhaust and it dynoed 393rwhp@6800 after being tuned. the tuner set the rev limiter at 6800 since i am on a stock bottom end and dont want to run the motor too high in the RPM's.
That may blow the entire universe out of order.
I believe some of you have it *** backwards. A lower LSA means more valve overlap which generally means higher dynamic compression which generally means the motor will make power in a higher rpm range than a cam with a higher numerical value for LSA. I say generally, because it is not always true. The duration of the intake also plays into the formula. Do a search for "valve overlap formula" and I'm sure its out there. But, the more valve overlap you have, the higher the rpm band (generally).
Also, look at Futural's homepage. They have listed the power bands for each of their cams. The cams like the t-rex have a much higher power range on a lower LSA than the smaller cams.
Also, look at Futural's homepage. They have listed the power bands for each of their cams. The cams like the t-rex have a much higher power range on a lower LSA than the smaller cams.
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From all the research I did....
The 112 peaks higher, but is a narrower powerband.
The 114 peaks a little lower, but is a broader powerband.
The peaks are in the same place, determined by duration.
If you want to move the peak up or down, advance or retard the cam.
The 112 peaks higher, but is a narrower powerband.
The 114 peaks a little lower, but is a broader powerband.
The peaks are in the same place, determined by duration.
If you want to move the peak up or down, advance or retard the cam.
