what is the difference in these 2 camshafts?
#1
#6
There is a big difference between the two. The first one has specs that many used to call "RV" cam specs. A step above stock and mostly intended for towing and low-speed torque production. The second cam can be considered a mild (or even middle for a little engine like the 4.0) performance cam with streetable duration numbers at .050. On the little 4.0 it would be decently lopey and would not have as much idle vacuum as stock or the 256 camshaft. It would cause you to lose some low-end but your midrange and top end would improve tremendously. If your heads and intake are staying stock and you like to tow and do a lot of daily driving and off-roading I would say go with the first cam. It is more of a 'truck" cam and will move a 4x4 pretty well. Just don't expect a huge increase in top-end power. If you are porting and maybe bumping compression a little and have some decent gears, then I would get the 2nd one. You would love the power increase.
Oh BTW, the first one should still give you a little bump at idle.
Hope this helps!
Oh BTW, the first one should still give you a little bump at idle.
Hope this helps!
#7
More info:
My Dad had a 3.8 V-6 swapped in an '86 Ranger (unusual I know...) that had Holley Pro-Jection (throttle body), heads I ported, flat-top pistons, and a cam from Racer Walsh with .050 duration specs and lobe separation like the second cam you mentioned. Total duration was 282 (the one you mentioned above is 270), but the .050 number is actually more important. It was lopey, not as torquey down low as stock, but from about 2,500rpm up it would scream. Wasted a many 4.3 S-10. It was a lightweight low-option (originally a 2.0 engined truck) 2wd Ranger though.
My Dad had a 3.8 V-6 swapped in an '86 Ranger (unusual I know...) that had Holley Pro-Jection (throttle body), heads I ported, flat-top pistons, and a cam from Racer Walsh with .050 duration specs and lobe separation like the second cam you mentioned. Total duration was 282 (the one you mentioned above is 270), but the .050 number is actually more important. It was lopey, not as torquey down low as stock, but from about 2,500rpm up it would scream. Wasted a many 4.3 S-10. It was a lightweight low-option (originally a 2.0 engined truck) 2wd Ranger though.
#12
Unregistered User
Posts: n/a
What you have to compare is lift amount and Duration. The longer the duration ( measured in degrees ) , the longer the valve is open to let air/fuel into the cylinders.
The second cam has a longer duration and a bit more lift to it, thus its going to have a bigger/wider ' power ' band ( or a noticibly different one from stock/the first cam ).
The second cam has a longer duration and a bit more lift to it, thus its going to have a bigger/wider ' power ' band ( or a noticibly different one from stock/the first cam ).
#13
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