How does lobe seperation affect drivabilty?

skiwesser · 11-19-2005, 01:50 AM

Using Dyno 2000, the closest model of my motor makes more power and torque with Lun-51027 218/222 @ .050 .509/.509 lift, verses TF #1 cam, 221/225 .499/.510.
Peak power is minimal but the Lunati (which is a holley systemaxII cam) makes 10-12 more FT. Lbs. of torque between 2000-4000 RPM.
I don't really understand cam math but I have both, my concern is the Lunati cam has a 107* lsa Vs 112* on the Trick Flow cam.
Which is more streetable? I was told the 107 will have a rough idle?

Rebuild consists of new eagle rods,forged pistons, .030 stock block,stock crank (all balanced).AFR 165's, performer intake, 65mm TB, 73mm mass air, 24# injectors, 1 3/4 longtubes, 100-150 shot of spray and WHICH CAM??????????

HELP!!!
Thanks
Wes

Unit 5302 · 11-19-2005, 04:41 PM

LSA or lobe separation angle is the figure representing the degrees of crankshaft rotation between the maximum lift of intake and exhaust lobes from each other.

Generally, the larger the lobe separation angle, the less overlap and greater drivability the camshaft has. Overlap isn't all about LSA and LCA though, total duration plays a part here as well.

The TFS camshaft has more LSA, but it also has longer duration. Even so, I expect the TFS cam is probably more streetable with a smoother idle.

11-19-2005, 04:41 PM	#2
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Re: How does lobe seperation affect drivabilty? LSA or lobe separation angle is the figure representing the degrees of crankshaft rotation between the maximum lift of intake and exhaust lobes from each other. Generally, the larger the lobe separation angle, the less overlap and greater drivability the camshaft has. Overlap isn't all about LSA and LCA though, total duration plays a part here as well. The TFS camshaft has more LSA, but it also has longer duration. Even so, I expect the TFS cam is probably more streetable with a smoother idle.

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11-19-2005, 01:50 AM	#1
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	How does lobe seperation affect drivabilty? Using Dyno 2000, the closest model of my motor makes more power and torque with Lun-51027 218/222 @ .050 .509/.509 lift, verses TF #1 cam, 221/225 .499/.510. Peak power is minimal but the Lunati (which is a holley systemaxII cam) makes 10-12 more FT. Lbs. of torque between 2000-4000 RPM. I don't really understand cam math but I have both, my concern is the Lunati cam has a 107* lsa Vs 112* on the Trick Flow cam. Which is more streetable? I was told the 107 will have a rough idle? Rebuild consists of new eagle rods,forged pistons, .030 stock block,stock crank (all balanced).AFR 165's, performer intake, 65mm TB, 73mm mass air, 24# injectors, 1 3/4 longtubes, 100-150 shot of spray and WHICH CAM?????????? HELP!!! Thanks Wes __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ