bsf

iTrader: (7)

I ordered a 224/228 .581/.588 110+0 cam. The following is what I received today.



So, now I have a 225.5/229.8 .579/.587 cam

I originally planned on installing it straight up. Assuming published specs for my engine, 63.6cc LS6 heads, and .045” x 3.905” gaskets, I calculated DCR would be 8.60 and quench would be .038.

I am not exactly certain how to calculate the DCR from this cam. I do not know whether to allow the calculator to determine VE’s itself from the durations listed in the report or to plug the IVC from the report directly into my calculator. My calculator does not calculate VE’s that match those on the report. The discrepancy in IVC is 1.5 degrees. I do not understand this.



Regardless, if I install this cam straight up with my un-milled heads and .045” x 3.905” gaskets, my compression will be too low: 8.25 – 8.37, depending on what values I use. With my originally planned setup, PTV clearance should have been fine. I would have measured to make sure. Now, I am not certain what I should do with this cam. If I use it, should I advance it a couple of degrees; try a smaller gasket; mill the heads, or some combination of the mentioned. I am trying to build a NA mild street machine with an emphasis on manners and low end torque.

dwarmenzerk

id talk to whom ever you bought it from first.

Patrick G

iTrader: (14)

What you don't know won't hurt you...that's the problem. See, pretty much all of Comp's cams come in a little bigger than the advertised spec. People that order them without a Cam Pro Plus printout get a cam card, install them and are as happy as a pig in ****. Getting a Cam Pro Plus printout reveals the truth that not everybody knows...the Comp Cams run big.

So if someone is bragging about their 234/234 112LSA cam, it really is closer to 235.5/236 111.7LSA. Don't get too hung up on the actual numbers. You got what you ordered. Put it in and degree it to where it works best with your calculations. Use J-Rod's calculator as it allows you to input custom valve events at .006". My 8.73:1 DCR is based off of actual Cam Pro Plus numbers and actual installed intake centerline. It's the only way to do it right. 250psi of cranking compression tells you I did something right.

DaddySS

Agree

Asmodeus

I ordered a 228/232 .639/.595 on a 112+2

I got a 228.7/232.6 .644/.596 on a 112+2 exactly.

My lobes ran a tad big too. I'm milling my heads 3cc's to get a 8.57:1 dcr per Pat's recommendation.

orangeapeel

iTrader: (18)

interesting find. Makes me want to go bust the card out and crunch.

1989GTA

I agree with Patrick. What you have discovered is in fact quite normal. You are not likely to find a cam that is exactly on the numbers. In fact #7 lobes may be a liffle different than the #1 lobes that the cam was checked on. So don't get excited just put the cam in as suggested by the grinder.

My experience with my Comp Cams XFI 268 cam mirrors what Patrick said and for me I was a happy camper. The specs call for the cam to have 218 degrees of duration at .050". On the cam doctor it was in fact a little over 220 degrees of duration a .050" and verified with the degree wheel as we installed it. A good thing in my opinion.

99blancoSS

iTrader: (115)

yep even my tr224 was not spot on at 224

Ryan02SS

iTrader: (3)

Yep, my TR224 is 223.8/224.7 .563/.569 111.8LSA

bsf

iTrader: (7)

If that is what “the man” says, that is what I will do.

Thanks everyone.

bsf

iTrader: (7)

Yeh, I am a little slow. So I guess this means my new LS2 timing chain will be up for sale and I get to waste more money on an adjustable timing set. Yippee-ki-yay motherf***er! Wow, I am way, way, way over budget. I need to rethink my plan and find some places to cut costs.

pdd

iTrader: (3)

sane here i order a xe-r 228 232 111+1, it came in as 229.2 232.5 111.4+1lsa WTF-throws my calcs out the window, but still comes out decent

ThirdGenLS1

iTrader: (11)

yep they are always a little off, my 227/231 came out to a 228.5/232.9

Patrick G

iTrader: (14)

My 223/227 110LSA LSK lobed cam came in at 224.3/228.2 110.3LSA. That why I called it a 224/228 cam for so long. But after a while, people were assuming it must be an XE-R lobe so I put my cam signature back to the advertised numbers of 223/227 110LSA so they would know it was an LSK.

bsf

iTrader: (7)

I appreciate everyone’s help. I always seem to be operating at the edge of my understanding, and this project seems a little overwhelming at times. An acquaintance has a degreeing kit, and said he would give me a hand. Assuming my cam report is correct, and using the VE’s from the report, the following shows what I would have with 2 - 4 degrees of advance.

+ 2 would yield

IVO 1.6 + 2 = 3.6
IVC 43.9 – 2 = 41.9
EVO 45.8 + 2 = 47.8
EVC 4.0 - 2 = 2.0
DCR 8.42

+ 3 would yield

IVO 1.6 + 3 = 4.6
IVC 43.9 – 3 = 40.9
EVO 45.8 + 3 = 48.8
EVC 4.0 - 3 = 1.0
DCR 8.49

+ 4 would yield

IVO 1.6 + 4 = 5.6
IVC 43.9 – 4 = 39.9
EVO 45.8 + 4 = 49.8
EVC 4.0 - 4= 0.0
DCR 8.56

Once again, assuming the cam report is correct, what do you think the best choice would be. Assume headers, dual exhaust, Patriot ported LS6 heads (63.6cc w/ 2.00”/1.55” valves), and LS6 intake. I am trying to build a NA mild street machine with an emphasis on manners and low end torque.

PREDATOR-Z

The best would be to set it at desired powerband in mind. Advancing every 2* will bring that band lower by about 200>300rpm.

Zger

iTrader: (18)

I have a Cartek 2X cam that is supposed to spec out at 224/228 on a 114 but in reality it was 225.33/229.08 on a 114.1. I'm not complaining.