VTODD

iTrader: (2)

i am asking for help with the following cam inside a LS2 equiped Trailblazer SS.

214 .559 intake w/ 3710 lobes
220 .564 exhaust w/ 3713 lobes
ICL 109
ECL 114
LSA 111.5
-6 overlap and +2 advance ground in

i was settled on it for awhile until somebody put the numbers in a DCR calculator and told me the dynamic compression would be 8.9 which is apparently very bad for a pump gas street application. so now i am just a bit concered and confused. i already paid a $500 deposit which happens to be non-refundable from a sponser (where i am getting the cam from and tune, headers etc) the tuner happens to be on vacation now, and will not show up until the day of my appointment, so i really dont have anybody to directly go to. the shop is about 3 hours away from me, so i cant just pop up and ask some preliminary question to the tuner and change my mind all of a sudden. i just dont want my LS2 to go pop!

any insight or suggestions would be very appreciated.

thanks in advance!

todd
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VTODD

iTrader: (2)

anybody?

VTODD

iTrader: (2)

please

Patrick G

iTrader: (14)

DCR is 8.80:1

That's an excellent cam for that vehicle. Keep in mind, the LS2 does not run lots of timing and that cam will probably work nicely with close to stock timing tables. I'd keep the cam. I run around that much DCR in my TA. As long as you have 93 octane, you should be fine.

02ZOh6

Vtodd, what's your truck run btw? My buddy just picked one up and my dad threw a 3600 stall in it for him and it rocks. Huge difference.

VTODD

iTrader: (2)

thanks so much for that knowledge! i really appreciate it.

todd

VTODD

iTrader: (2)

i have not had it to the track yet. i hope to hit the local 1/8 soon.

Patrick G

iTrader: (14)

Ditto. A high stall converter will make a night and day difference on the SS TBlazer.

gun5l1ng3r

Do they run a really low stock stall converter because they are a truck?

Patrick G

iTrader: (14)

Yes, pretty much.

02ZOh6

You also lose all your towing capability with the 3600. The only thing it hauls now is ***. My buddy doesn't tow anything anyway.

broken98

i would love to see some numbers with your set up. im considering buying a tb ss

02RedHawk

iTrader: (17)

Checking the numbers on a 109.5 ICL, its an 8.86 DCR. (109ICL makes it an 8.9, Todd, which was from the cam #s I got from you earlier 2.5* advance). P-G, what you said above is key - it should run on stock timing tables (which is only 18 degrees), pretty poor for 243s which have ~24 degrees stock on Z06s. In addition, the other major factor I worry about is the 8.85 DCR on stock .054" head-gaskets. Quench is too big.

P-G, correct me if I'm wrong, but you're running about 8.73:1 if I remember right? With how tight of a quench, though?

On 6/30, You posted this in a similar DCR-related thread:
"8.5:1 seems to be the limit for 91 Octane and 8.8:1 seems to be the limit for 93. If you're running higher octane than this, you can bring up DCR."

Please don't take this the wrong way, P-G; I too am very interested to get some feedback on this subject. But, much like Todd, am wanting to feel 100% sure with the decision....and not be clenching the butt-muscles in nervousness each time I pull up to a gas station and see there's only 92-octane available (or suspicious 93)....

VTODD

iTrader: (2)

oh the cam woes.....

92 octane is starting to become the norm in my area along with 10% ethanol. not good.

Patrick G

iTrader: (14)

Obviously, you can run lower octane fuel than 93 if you don't jack up your timing too much. I run 26 degrees of timing at peak torque and 30 degrees of timing at peak power. Much of the credit is due to the tight quench of .032". I would expect you could run lots more than 18 degrees of timing, even with 91 octane, LOL.

VTODD

iTrader: (2)

so what i have gathered is that you can completely contain the high DCR by having lowered timing....problem solved, no knock?

thanks for the help so far, by the way.

todd

02RedHawk

iTrader: (17)

"Contain"....or better termed "compensate"...?

VTODD

iTrader: (2)

i guess what it comes down to, is how much power this cam will make without adding any timing (and hopefully not taking any away), using the near stock timing table.

thanks alot redhawk and patrick for your views, and i will post the numbers (crossing fingers that they are worthwhile) once i get it dyno tuned.

thanks!