For some reason I always feel disfunctional computing dynamic compression but with a 12.8 to 1 compression and the 245/248 cam mine says 8.4 which really surprises me as I was expecting it to be a tiny bit higher. Anyway in going from 12.4 to 1 to 12.8, I had to pull about 5 degrees out at lower kpa to prevent pinging with just that much of a minor change.

Besides that.....drives great.

OK......you guys now can fight some more. Who's turn is it? I forgot.

 

Well i put in my cam request to Cam motion and we will see what they come back to say. In the mean time im going to keep contacting others and see what they recommend & wait for others to chime in this thread.

I do have a question what does this + # mean after the LSA? For example like 1racerdude said 112 + 4 what does the + 4 represent?

 

4 degrees adv ground in the cam.


David

 

it meas they grind 4* of advance into the cam so you dont have to try and advance the cam timing with your timing chain setup.

 

Thats what i thought but wasent sure. is that better then trying to advance the cam by the timing chain?

 

Yes.



David

 

The pin placement is such that ICL is 4* advanced.
Advanced pull the torque to a lower RPM and the opposite higher. You don't need more than 4* if the cam is right for the engine set up.

 

Alright got my cam specs from cam motion they recommend

A 247/253 .683/.664 on a 110 LSA the part number shows the last numbers being a 110+4 so i don't know it's a true 110 + 4 or if it's just part of the part number.

What do you guys think of the cam? it's similar in duration to the comp cam recommendation but the lift is different along with the LSA. Im going to plug it in and see what the DCR will come out to be.

 

the lift seems backwards to me first off your flow numbers lack on the ext side and they tell ya you want a bigger lift on the ext to clean out the chamber for the fresh intake charge

 

Not sure about the lift aspect one way or the other but the spec's are consistent within the range of what I've personally seen in very well performing stroker LTx engines.

Haven't done business with Cam Motion in 7-8 years after my solid lifter breakage episode so things may have changed but it seems every time I got cam spec's from them it was different. Perhaps it's just me....I'd expect them to be the same or at lease very similiar for the same setup.

 

I had the same experience with Comps "Cam help line". I think the people just type crap into the computer and read what it spits out with no real knowledge of what really going on. I called 4 times, gave the same info and got 4 different cam recommendations. Maybe its better now but it wasn't when I tried it a couple years ago.

 

I was actually going to try that with comp, the guy didn't seem like he asked enough questions and seemed like he didn't know what was going on so i thought about calling and talking to someone different and see if they recommend the same cam.

 

I you want to double check the recommendation, call Mr. John
at Bullet 662-893-5670. This guy knows his business.

 

Sounds like a nice cam for your application. Not sure what your specifics are but Cam Motion wont steer you wrong. Their cams usually have alot of lift for some reason. Those specs are probably with 1.6 rockers also. If you step back to a 1.5 it will lower the lift quite a bit. I say the more lift the better

My Cam Motion cam has more lift on the intake also : .686" I and .674" E

Just make sure you check PTV clearance.

 

Agreed.... I've used a lot of Bullet cams over the years. I consider it an advantage, since not too many people know of them.