OK, i thought i had decided on the 218/224 but i talked with CMS and they mentioned the 221/227. He couldnt give me real specific powerband info on the 221/227 though. Anyone know the powerband of the 221? I saw a dyno graph of the 218 it it looked like what i was looking for, but i dont want to regret not going up the 221.

These are both on a 112 lsa and will be used with stock heads.

Help me make this decision. Its for an everyday driver that rarely goes to the track. Im looking for a nice broad power band, not just peak HP. I like to have the power at the lowe RPMS where i can use it and make the car fun to drive eveyday.

Anyone know the idle difference btween the two?

 

What you are describing better suits the 218/224. The 218/224 will have better daily driving characteristics.

The higher the duration, the higher you need to spin the motor to make use of the TQ band.

Dan

 

Any idea how far the 221/227 cam moves up the power band? It seems no one uses the 221/227, why is this?

I just dont want to regret not going bigger.

 

I have the cam and like it so far. I know you mentioned not being interested in peak numbers but you can see mine in sig. Unfortunately the TQ numbers are prob. lower than I'm actually putting out. I didn't notice till later that the 325 peaked right at the start of the dyno at 3900rpms. TQ stayed above 300 till about 5400rpms.
As far as HP goes this cam really starts moving above 5 grand. and didn't drop below 300rwhp till around 6400rpm.

Hope this helps a little.

 

How is the idle on it? Can you hear much of the cam or does it sound pretty stock. How much low end did it feel like you lost over stock? Seems like no one runs this cam.




Power band on the 218/224 is 2400-6000, on the 224/230 its 2800-6400. Wouldnt that make the 221/227 about 2600-6200 since its right in the middle?

 

A significant determinant of the idle is the LSA. Since both cams are 112 I'll bet you could never tell the difference between them. Frankly, I bet you won't notice much difference in performance either. While you are trying a rational approach to deciding between these cams, I think you are overly focused on the intake and duration numbers. There are several other cam grind variables that also need to be considered. Lastly, I don't think there would be a noticable performance difference on the butt-dyno. I would believe either is a decent streetable, daily driver cam for a stock or mildly modified LT1.

 

What are the lift numbers? If you got the bigger cam and was worried about too high rpm, have 4 degrees advance ground in. That should move the powerband down.

 

Here are the lift numbers for the two.

Comp Cams TN218XL Camshaft 218/224 duration @ .050", .526"/.536" lift with 1.6 rockers, 112lsa. Excellent cam for street stock displacement engines. Huge torque, good powerband. Computer tuning recommended

Comp Cams TN221XL Camshaft 221/227 duration @ .050", .542"/.560" lift with 1.6 rockers, 112lsa. Excellent cam for stock displacement naturally aspirated cars. Excellent power range, with both good torque and horsepower.

I just want to make sure i make the right decision, dont want to spend all this money and do all this work and end up wishing i had gone with the other cam.

 

I would go with the bigger one. I had a 226-234@50 570+lift and loved it. I also had a Hotcam 218-228 and it worked well also but was small. Since you have an M6 you don't have to worry about ideling in gear and you can launch at whatever rpm you like so go with the 221-227. Later Clint

 

Idle is lopey as hell. Low end still feels pretty nice still chirps my 315s.

 

I've got the 218/224 and it is a fairly mild cam. You can tell a little lope to the idle but, the hooker LTs and Mufflex really put out the sound. Might look at the specs of the hot cam or LT4 hot cam... they are similiar size and may be cheaper.

 

218/224 sounds like a good one, but you really can't have the best of both worlds. You've got to make up your mind about what want and how you will be driving it most of the time.

E.g, 210/224 really a stump puller, but it is a 6000 RPM cam and a little shy on top.

The 218/224 should give you a bit of both worlds.

But if you want steetability and a stock idle, you better think twice before you go any larger than 220s/230 unless you have a really good tuner. JMHO

 

Will stock fuel injectors be enough for either one of these cams. I think i am leaning toward the 221/227. I am i going to be needing fuel injectors also?

 

the 221/227 has faster ramps, so it should make about as much torque as the 218/224.

If you want a lopey idle, get a tighter LSA. 110 would sound wicked with either cam

When I was going to put a cam in with the stock iron heads, I was going to get a 218/230 on a 110 LSA to use with nitrous for my impala. Comp has almost 70 SBC hydraulic roller lobes in their catalog and Combination can order any 2 for a conventional cam. The 221, 227, 233, 239 lobes are owned by them and are sorta in between the 33xx and 31xx XE lobes.

 

Thanks for all he input guys. Does anyone know about the fuel injectors?