After reading over 2 weeks, asking over 1 million questions and sending quite a few PMs i think i found the right cam for my car. Now i do have some easy questions. But why i chose it..

i chose a 228/232 .588/.595 110+2 (maybe a +4) I have not yet decided who will custom grind it yet.. Comp or TSP??? Anyways i chose it b/c it will make little more power than the TR224 cam and it has a higher DCR. The higher the DCR the torquier the cam will be. The nature of this cam would have serious power under the curve/mid-range and combined with the 3.73's you're looking at a killer combo. This is a great street cam. It will start at 3000 RPMs, and so with the 110+2 it had the IVC at 42 which will allow the cam to rev to 6500/6600 RPMs. Ohh and it has 10* of overlap which will make for a choppy idle!

Now here are some questions.

1) Degreeing the cam it already has +2 grounded into it, and i know that the ICL is 108.. So where do i line it up? do i want an adjustable timing chain or LS2? BTW what does ICL do? i know the basics.. Now i need to learn the crutial stuff.

2) Would 3.73s 0r 4.10s be too much?

3) The DCR of 8.15.. Is that good or bad? High or Low?

here are the spec according the DCR calc.. ALL AT .050. Now i know what some of the specs mean but not all of them. can someone help me out a little bit?

ICL - 108
IVO - 6 (BTDC)
IVC - 42 (ABDC)
EVO - 48 (BBDC)
EVC - 4 (ATDC)
ECL - 112
Overlap - 10 (Degrees)

Anyways i think i am done. What do you all think??

Thanks to everyone that helped me out

-Jonas

EDIT: Here is my accessories that i will need. let me know if that is good or bad

Cam pckg: 918 springs, ti retainers, timing chain, seats & seals and ti retainers
Push rods: 7.425" chromolly
Oil Pump: LS6 ported and shimmed
Stock Lifters/Rockers
Reuse stock locks
What gaskets?

 

I specd my cam out to almost the same- see sig

 

that cam should give you some sweet power under the curve. don't forget to get a new balancer bolt. as for gaskets you can reuse most of the ones you have,i've reused mine twice and haven't had any leaks.

 

TSP uses comp to do their grinds. Go with whoever is cheaper. It will be the same cam.

 

Funny thats what you arrived at, that is the cam I'm wanting to run. I'll probably use an adjustable timing set and install it on a 106 ICL to run cam only, then install it straight up when I get around to putting AFR 205's on.

Sounds like your criteria changed a bit since you started, but I'm sure you'll be happy with it!

Good luck

 

i like your car! orange looks awesome!

 

Is that going to be a good streetable cam?

 

yeah.

 

1. Since it is a 110 LSA 108 ICL in the grind, you will intsall dot to dot if with wish to keep the ICL at 108.

2. 4.10's all the way, 3.73 is not much of a change from the stock 3.42's.

3. DCR of 8.15 is not a lot, but is not too little. Personally I would try to go higher.

Accessories are good, although i would measure to make sure you get the proper length pushrods, and go with a .040 gasket set or smaller, that will bump up compression a little bit and will make for a tighter quench area, which aids in combustion.

 

First of all i jsut wanted to say thanks to everyone that has responded so far. With this thread i got a MORE POSITIVE feedback then my first couple threads. You can see how much i have learned in a few days/weeks. So thanks again to everyone... But i still have some questions that i am not clear on..


Hey great minds think alike

Yea that is what i want.. Can not wait. What is the balancer bolt and where does it go? Crank? And as for gaskets, I ALWAYS use new ones, never take a chance with crushed gaskets.. But that is me!

 

Thanks for the heads up. I will both TSP and Comp to get pricing on a complete cam package



Yes after reading yesterday from 4 P.M. till 12 A.M. i liked all the testominies and good compliments on the cam! Now as for timing still little tricky for me. It is based on a 110+2 so i the ICL is at 108.. Where would you degree the cam at then?

 

1) from what Predator Z has stated many times, you want to degree a cam to properly insure that you will get the correct ICL.. So you are stating that i should isntall it dot to dot then??

2) Here is a question. i know that with a gear change, this allows to the car rev faster. With a 4.10 or (4.11) would it make the car rev to fast and blow thru the Power Band? What about a 3.73. i know that it is not too much bigger than the 3.42... but what if?

3) Ok how do you get the DCR to be higher? i played around a little bit. 110+4 would raise it to 8.3.. But with 4* advanced wont it hurt tq a bit? Basically how do raise the DCR w/o changing anything in the cam?? What should a 'GOOD' DCR be around?

4) What about SCR? This cam will give me a 10.37:1 SCR.. on stock H/I. What do you want that to be around?

5) Ok i will measure or look around for pushrods. Will chromolly push rods hold up? And i need reassurance on springs jsut b/c i am so close to .600" lift. will the 918s be ok? And as gaskets go. i will do some searchig on that too..

and if you can, can you go over these numbers a bit with me so i can make more sense out of them....

ICL - 108
IVO - 6 (BTDC)
IVC - 42 (ABDC)
EVO - 48 (BBDC)
EVC - 4 (ATDC)
ECL - 112
Overlap - 10 (Degrees)

 

1) Yes. Install it dot to dot to get your 108 ICL.
2) You will not blow through the powerband. 4.10's will help you get to that power band faster and stay in it.
3+4) The best way to bump up the DCR now that you have spec'ed out your cam is to run a thinner gasket. Something like a .040 like Brad said would bump it up a bit. Cometic makes great gaskets, but you definitely pay for them. A "good" DCR to run on 93 octane would be about 8.4:1 - 8.5:1 without any issues. SCR is just a result based on DCR. DCR is what you want to look at in terms of power, tuneability, and detonation risk.
5) You should be good to go on the Comp 918's for springs.

IVC - intake valve close
IVO - intake valve open
EVC - exhaust valve close
EVO - extra virgin olive.... i mean, exhaust valve open
ECL - exhaust center line
ICL - intake center line
Overlap - how many degrees of cam rotation(as a measure of time) that both the intake and exhaust valves are both open

 

1. It has advance ground into it already, line it dot to dot for 108 ICL.

2. yeah a 4.10 will go through the gears faster, but after you shift the RPM's will alrady be in the good powerband spot. i wouldnt bother with 3.73's.

3. You can up the DCR by smaller head gaskets, milling heads, or advancing the cam. In your case the way to up it is to get a smaller gasket or advance the cam some more being that you arent going to do head or engine work. Keep in mind though that advancing the cam too much will result in moving overlap away from TDC and will lower your top end power. Your cam dot to dot will be as close as you can get to having overlap over TDC.

4. Who cares about SCR, DCR is what is important.

 

A couple things:

1) I thought you already had 3.73's before, and we're talking about more cam now. If you already have 3.73's, leave them, as there really isn't much difference. If you are going to change gears from stock 3.42's, go to a 4.10.

Since you are primarily a driver, 4.10's in the stock rear will be fine. Just don't put even a drag radial on your car and expect it to last. If you decide to drag it, sell the rear end before it grenades and put the proceeds towards a good 12-bolt or 9 inch rear. Don't bother upgrading any parts in the stock rear. All the billet axles and bulletproof differentials don't change the fact that we have a weak 7 5/8" ring gear.

2)Static compression ratio is just that - static. SCR never changes unless you physically change the head gaskets to something thinner or have the heads milled. Dynamic Compression is primarily determined by the camshaft, but it is dependant on the SCR. Raising SCR with a thinner gasket will also raise DCR, which is a good thing.

Another way to raise DCR is by advancing the cam, in your case moving the ICL from 108 to 106. As metioned above, that moves overlap away from exhaust and may hurt the top end a bit, in exchange for a little punch on the low end. Your other alternatives are tightening the LSA, which you already did when you selected a 110 over all the 112-114 cams out there, or to reduce the intake duration, which takes you right back to the TR224 where you started.

To optimise DCR, you are best off switching to a .040" head gasket, and if you are real serious about it, have .012 - .015 milled off your heads. That would give you ~ 8.6 DCR.

3) If you were to degree the cam, you would install it dot to dot, then setup the degree wheel to verify that you actually get the valve events listed. If you get the IVO and IVC as listed @ .050, you confirm two things: correct duration & correct intake centerline angle. You can stop at that point, or check the exhaust to confirm duration and LSA are what you wanted.

+1 on the 918's being ok. These were rated at .615 max lift until the 921 duals were released. Also, chromoly pushrods are fine too.

 

1) ok i will line it up dot to dot. Glad that was cleared up! BTW what role does the ICL play?

2) Ok 4.10s or 4.11s is the gear for me. Yes i knwo that the 4.11 is the same as the 4.10. What gear is the best? I think that the Motive whines like crazy. And Richmond will be ok. And I think that GM makes a 4.10 correct? As for now, how will my stock 3.42s be???

3) Ok so we cleared up that .040" gaskets will work. And yes i run 93 octane here! BTW what comes in the gasket kit? Front cover and valve cover gasket? Wiht a .040" gasket how much will the bump up the DCR??? How do figure if the overlap is TDC?

and i know what all the abbreviations stand for LOL Extra Virgin Olive oil.. But i was wondering what the numbers all mean...

Thanks.. now i need to do some more research

 

With the .040 gasket you will be at 8.38 DCR if the cam is installed dot to dot.

all the abbreviations are degrees before or after piston top or bottom dead center, hence EVO 40 means that the exhaust valve opens 40 degrees before bottom dead center of the compression stroke

 

Cam only that Cam will peak at about 6k rpm,has a great flat power curve. We've been selling that Cam for years

 

with the DCR calc.. can you input the thickness of that gasket so that i can see the 8.38 DCR????

 

looking at the numbers IVC at 42* will make it still be on a power stroke and should peak around 6200 It will carry at least till 6500/6600.

If it was on a 110+4 will peak at like 5800/5900 due to its 39 IVC, and will die off sooner after peak, meaning your shiftpoints will be lower like 6100>6200.