Camshaft question #43,672
#21
I have to chime in here with a shameless plug for V-Thunder cams (made by CompCams). I run a V-Thunder EVL-3010 cam in Bertha, my '95 FLHTP. It's similar in duration to the EV-27, but the ramps are much less aggressive - meaning a quieter valve train and less jolting of it. It has a 30 degree overlap, and symmetrical valve timing - which afford excellent gas mileage.
Bertha gets about 45 MPG, and she tops out at over 900 lbs. Chrome is light, but she has a LOT of it - plus a Tour Pak with rack, lights, and lots of bling trim everywhere. All that makes her heavy - but she still gets great gas mileage with the EVL-3010.
The V-Thunder cams are well worth taking a hard look at! I love the EVL-3010.
The higher duration (the number of degrees the valves are open) a cam has, the higher the revs needed for that cam to produce the most power - because longer duration shifts the torque band to the right - but the more total power that cam is capable of producing. Higher duration cams peak out on torque nearer to the torque-horsepower crossover at 5252 RPM - so they produce the most total power and (torque and horsepower).
The EV-46 and V-Thunder EVL-3020 have very long duration (242 or near, I think), and so they need a lot more RPMs to produce it maximum power output. This is why they are more suitable for lighter bikes like Dynas and Softails.
The EV-27 and EVL-3010 are both good mid-range cams - suitable for heavy baggers IF you don't mind cranking the engine more to get more total power. These cams will not be as good for low-RPM torque though... The EVL-3010 I have in Bertha comes in strong around 3000 RPM and scream right up to redline. The EV-27 will deliver very similar performance.
If you want a lot of low-RPM torque, stick to a lower-duration "torque" cam like the Andrews EV23 or the V-Thunder EVL-3000... but be aware that lower duration also means the torque will drop off sooner (the cam is said to be "all in"), and you won't get as much higher-RPM total power because your engine is not producing as much horsepower at lower RPMs. Horsepower is a function of torque and RPM. (HP = torque * RPM / 5252)
Bertha gets about 45 MPG, and she tops out at over 900 lbs. Chrome is light, but she has a LOT of it - plus a Tour Pak with rack, lights, and lots of bling trim everywhere. All that makes her heavy - but she still gets great gas mileage with the EVL-3010.
The V-Thunder cams are well worth taking a hard look at! I love the EVL-3010.
The higher duration (the number of degrees the valves are open) a cam has, the higher the revs needed for that cam to produce the most power - because longer duration shifts the torque band to the right - but the more total power that cam is capable of producing. Higher duration cams peak out on torque nearer to the torque-horsepower crossover at 5252 RPM - so they produce the most total power and (torque and horsepower).
The EV-46 and V-Thunder EVL-3020 have very long duration (242 or near, I think), and so they need a lot more RPMs to produce it maximum power output. This is why they are more suitable for lighter bikes like Dynas and Softails.
The EV-27 and EVL-3010 are both good mid-range cams - suitable for heavy baggers IF you don't mind cranking the engine more to get more total power. These cams will not be as good for low-RPM torque though... The EVL-3010 I have in Bertha comes in strong around 3000 RPM and scream right up to redline. The EV-27 will deliver very similar performance.
If you want a lot of low-RPM torque, stick to a lower-duration "torque" cam like the Andrews EV23 or the V-Thunder EVL-3000... but be aware that lower duration also means the torque will drop off sooner (the cam is said to be "all in"), and you won't get as much higher-RPM total power because your engine is not producing as much horsepower at lower RPMs. Horsepower is a function of torque and RPM. (HP = torque * RPM / 5252)
#22
I had a little vavletrain noise to begin with. The EV27 made it a little worse, but not bad. I also changed to VThunder lifters at the same time, so they may be a noisier lifter than the stockers, I don't know. I love this cam, it really woke the bike up. 2up and loaded down (probably overloaded) I get 40mpg. I'm having the heads ported/polished and decked, so hopefully it'll be even better, after this long cold winter ends. Hell, winter hasn't even started yet. This is gonna be a long winter.
John
John
#23
I had a little vavletrain noise to begin with. The EV27 made it a little worse, but not bad. I also changed to VThunder lifters at the same time, so they may be a noisier lifter than the stockers, I don't know. I love this cam, it really woke the bike up. 2up and loaded down (probably overloaded) I get 40mpg. I'm having the heads ported/polished and decked, so hopefully it'll be even better, after this long cold winter ends. Hell, winter hasn't even started yet. This is gonna be a long winter.
John
John
Might as well just watch the wildlife... they know best about what's really coming anyway!
#24
BTW - NOTHING is noisier than stock "B" lifters! I run Velva-Touch lifters, which use their own special lifter blocks, and are as quiet as a church mouse... they run with the tightest tolerances of just about any lifters.
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07-06-2005 12:06 PM