318 Cam Maybe Not
If you lool at the 0.050" spexs both 340 and xe250h cams are similar. Think of the xe250h as a fast ramp tighter LSA version of the 340 cam.
Im sure the 360 cam in a 318 gives a nice little bump but I think its to conservative.
I totally agree with you when you say idle to 3500 is a very important powerband for a street engine. In normal driving my tach rarely goes above 2000 rpm.
And especially if you got everything going against you eg. Heavy car, small engine, high gear, low stall etc..
But I think people shouldn't just go super conservative either.
Take the two mopar magnum create engines which I basically own both. 300 has stock cam and the 380 has a fairly stout cam.
I got magazine dyno of both below.
*note the 300hp one does start to 3000 rpm but looking at the curve both are probably the same or close at 2500 rpm.
I got the 380hp in a 68 Valiant with 2800 stall, 2.96 gears and 27" tires with an effective gear ratio of 2.63.
And I dont exactly have 300hp create but a 98 5.9 jeep which is pretty much the same besides 4bbl and headers. Its heavier and 3.73 gears and 32" tires with an effective gear ratio of 2.80.
If you compare the two dyno charts the 380hp engine meets or beats the 300hp from 2500 rpm plus except one point. Which is the peak torque of the 300hp has a slight advantage.
Driving both the valaint is a little soft under 2000 rpm. Which I blame more om the intake, single plane M1 then the cam.
Theres a dyno shoot out between the M1 and Airgap an the airgap made 20-30+ lbs-ft all over the bottom end.
Where the 5.9 jeep pulls hard from idle and if weighed the same as the Valiant would definitely be the better under 2500 rpm choice.
But doesn't mean the stock cam is the winner for a daily driver or down low performance. Theres a big cam difference between the two. Lots of choices, Im sure something like a 265 or 268 cam would give 90% of top and bottom. Basically having your cake and eatting to.
I think the trick is finding the cam thats gonna give you the most top end with out effect bottom end too much. Or a compromise that works for you.
The modified Hp and Tq is eddy heads and bigger cam something like a 275
If you lool at the 0.050" spexs both 340 and xe250h cams are similar. Think of the xe250h as a fast ramp tighter LSA version of the 340 cam.
Im sure the 360 cam in a 318 gives a nice little bump but I think its to conservative.
I totally agree with you when you say idle to 3500 is a very important powerband for a street engine. In normal driving my tach rarely goes above 2000 rpm.
And especially if you got everything going against you eg. Heavy car, small engine, high gear, low stall etc..
But I think people shouldn't just go super conservative either.
Take the two mopar magnum create engines which I basically own both. 300 has stock cam and the 380 has a fairly stout cam.
I got magazine dyno of both below.
*note the 300hp one does start to 3000 rpm but looking at the curve both are probably the same or close at 2500 rpm.
I got the 380hp in a 68 Valiant with 2800 stall, 2.96 gears and 27" tires with an effective gear ratio of 2.63.
And I dont exactly have 300hp create but a 98 5.9 jeep which is pretty much the same besides 4bbl and headers. Its heavier and 3.73 gears and 32" tires with an effective gear ratio of 2.80.
If you compare the two dyno charts the 380hp engine meets or beats the 300hp from 2500 rpm plus except one point. Which is the peak torque of the 300hp has a slight advantage.
Driving both the valaint is a little soft under 2000 rpm. Which I blame more om the intake, single plane M1 then the cam.
Theres a dyno shoot out between the M1 and Airgap an the airgap made 20-30+ lbs-ft all over the bottom end.
Where the 5.9 jeep pulls hard from idle and if weighed the same as the Valiant would definitely be the better under 2500 rpm choice.
But doesn't mean the stock cam is the winner for a daily driver or down low performance. Theres a big cam difference between the two. Lots of choices, Im sure something like a 265 or 268 cam would give 90% of top and bottom. Basically having your cake and eatting to.
I think the trick is finding the cam thats gonna give you the most top end with out effect bottom end too much. Or a compromise that works for you.
The modified Hp and Tq is eddy heads and bigger cam something like a 275