I just need some help at this point. I am just going to copy info from the build sheet. thanks
408 12:0:1
60cc et245s
wiseco pistons with-3cc up's
callies 6.125 rod
head gasket cosmetic mls .051
piston to bore .0047
deck height 9.230
quench distance .041 w/.051gasket

cam specs copyed word for word
intake and exhaust
lobe seperation= 114.2 cam deg
valve overlap=26.9 crank deg

intake
valve open 14.5 btdc
centerline 112.2 atdc
valve close 58 abdc
duration 252.5 crank deg
lobe lift .37811 in.
valve lift .64279in.
lobe area=33.23 in. * deg

exhaust
valve open 64.5 bbdc
centerline 116.2 btdc
valve close 12.4 atdc
duration 256.9 crank deg
lobe lift .38008in.
valve lift .64613in.
lobe area 33.41 in* deg

 

also do you think it is enough cam to spin the motor to 7kplus rpms? the car has a ported victor jr. on it also

 

http://www.kb-silvolite.com/calc.php?action=comp

 

it said my dcr is 8.9. that calculator is the best one I have seen. I think i figured it right

 

race gas? just a little

 

I think I might have to run race gas or a mix. we get 93 here though. I guess my numbers were right

 

are my numbers correct or not?

 

No, I don't think there right. Hell, I get 12:6:1 SCR, but we need the advertised .006" duration of your cam to make the correct IVC point. The adding 15* to the .050" is incorrect for the types of cams we use. It's more like adding 25. See if you can find the advertised duration. Should be around 300-310* at .006" then you can do this to the exact spec, not just guessing. Wee also need the advance or ICL. However, it's looking like your DCR is going to be in the low 7:8 to 8:2 range upon my guesstimations of IVC. Assuming I guessed correctly, you could still run pump gas. I guess it depends on your wants for the motor as to wether or not this cam is going to be good or not.

 

I dont have the other specs. This is the cam LME recommended for the motor. I am kinda mad now it looks like dcr is low it will most likely run like ****. I will just have someone do a custom cam after I get it on the dyno and see what it does

 

Yeah, mine is like + 30* not 15. Its a good calculator IF you put in the right numbers.

 

Just call LME and get the specs for us. I just need advertised duration at .006" and how much advance is in the cam to figure it out. It looks they were already off on your SCR if it was supposed to be 12.0.1. I personally wouldn't reccomend a cam like that unless your plannin on lots of spray and a all out track motor.

 

it is a mostly track car and i will be spraying a 300-350shot as soon as i get a few na passes down

 

I see the reason for their choice now.

 

SO with the http://www.kb-silvolite.com/calc.php?action=comp calculator and :


You would plug in 65? Does that seem right?

 

That's the number I went with,(except for my cam, it was 41* + 15= 56*) and came up with a DCR of over 9.2. My cam is smaller than your Comp, too.

That KB calculator doesn't use any LSA, or ICL numbers, either? like WTF?? or even IVC @ .006 which everybody here says you need to use. It uses IVC @ .050.

 

I get 9.4 DCR with my setup which is scary. 11.2 CR matches the other calculators. That is the reason I question the accuracy or the application.

 

That's were you guys are messing up. Your supposed to figure your IVC at .006" first thing before even going to the sight. For this, you will need your .006" intake duration and your ICL. Take your advertised, for example, it's 294, divide that by 2, then add your ICL, then subtract 180. This will give you your IVC at .006". So 294/2+112-180=79* IVC @ .006". The KB sight says to "add 15" to your .050" to get your IVC at .006", but that dosen't work on our cams. It's all about getting the right info first.

Your also adding 15, which is wrong. I know it dosen't say it on the kb sight, but once you get the correct info, it's the best sight to use. you application would be 287/2+113-180=76.5* IVC @ .006". Plug that in for your IVC and you should be on track.

 

Not the best DCR but better than my bad input.
Thanks Beast

 

Very helpful, Beast.(and Patrick, too!) Your #s were close to my final calculations.(I hope) To find the ICL @ .006 I take my cam's posted duration IVC .050 and add 50. This gives me 278. Divide by 2+112 (ICL) and then subtract 180. The number plugs in the calculator in the ABDC spot.(71) In my application, I get 11.17 SCR, and 8.43 DCR using a GM MLS gasket that compresses to .052. Anybody want to buy a set of Cometic .040s for a stock bore?

 

For pistons with valve reliefs do you put in -2?