Fireball

iTrader: (21)

After consulting with someone who's rather fast in the 1/4 mile on this board and knows their sh%t...they suggested a slightly more aggressive camshaft for my combo...

232/242 .560ish lift on a 109 LSA

it will have fairly agressive lobe rates but limited lift (not a big fan of big lift cams in ls1s yet)

May try this with the new crane double springs too...

FWIW...I have a 232/232 .574/.574 112 on XE lobes right now

Any thoughts :p

Damian

iTrader: (89)

Hmmm, sounds a like GSX2ish to me , j/k

sounds like a bad *** stick, that much lift is plenty, anything over .580 and you're just asking for spring troubles and not enough HP to risk it.

A 109 LSA is a little steep IMO. You will have ZERO vacuum with that stick, even slamming on the brakes could cut your car off. I would at least do a 112 LSA, to keep from having to set your idle at 1200 rpm's, preserving vaccum and keeping it somewhat streetable. If you want a 109 ICL, put some advance in it. There is no reason to run that cam on a 109, unless you want a rediculous idle speed, and a PITA to drive. That cam will still hit PLENTY of a lick on a 112, and the pre-ground advance will lower your powerband where you want it.


Josh

Smoke_ur_5.0

iTrader: (2)

Yeah the lower lift is a great idea. Try and put it around .570-.580 lift and stick to a 112lsa like Damian said. No need for a 109.

Sounds a little like my cam. 234/242 on a 112LSA...I wish I had a little less lift on mine too.

Fireball

iTrader: (21)

I think the key is going to be the tight LSA. Hell I have a 1000 rpm idle now...1200 is nothing ....car don't see alot of road miles anymore anyway

Damian

iTrader: (89)

Brian, IMO you're leaving some on the table going with that tight LSA. What leads you to believe you're going to be better off with a 109? We've done plenty of tight LSA comparison's here, and wider LSA's always came out on top. However it's your car, good luck

Josh

Beast96Z

iTrader: (21)

From what I see, the only thing your going to gain is a little overlap. Your keeping the intake charge the same as before, and unless your exaust is highly rendored, I can't see this cam making that much more power. If you stick to a 112, it would deffiantly be worthless IMO. If you have a decent free flowing exaust, I couldn't see the gain being worth the time.

Pro Stock John

iTrader: (34)

Sort of looks like you are trying to clone a G5X2 on a tighter LSA.

I'd stay 112 when you lower stuff idles like crap.

Fireball

iTrader: (21)

I'm always one for trying something different.

Hell when I did the 232/232 in a 346...everyone said it was TOO big haha... Now its pretty much smaller than most cams out there...

Maybe the next fad will be running 106 lsas

T/A Medic

iTrader: (1)

this is what im going with 234/242 110 +2 ( Comp XER Lobes )

Intake Valve opens - IVO 9 BTDC (- indicates ATDC)
Intake Valve closes - IVC 45 ABDC
Exhaust Valve Opens - EVO 53 BBDC
Exhaust Valve Closes - EVC 9 ATDC (- indicates BTDC)
Exhaust Centerline - ECL 112
Overalap 18 degrees


VE come out like this... which looks good to me

Phil99vette

iTrader: (11)

I like it, my 232/238 is on a 111 and I could have gone tighter. Power is great down low and up top. Just bring up compression to battle the loss of cranking compression with the long duration. Maybe 12.75:1 - 13.0:1. That should have similar cranking compression to a 224/228 @ 11.25:1 on a 112lsa 108icl. My predictions are 220-235 cranking PSI.
Phillip

GrannySShifting

iTrader: (10)

Brian it will idle fine with some time in it, ive gotten cams that size to idle stable at 800 in an auto.

I think thats a pretty good pick but only one way to find out.

TXCAMSS

iTrader: (60)

Fireball- I think you are on the right track if the right person is cutting the cam. The tighter LSA cams are going to be very popular very soon. It will keep the power band down in a useable range and if it is cut right the idle quality won't be much of an issue. I don't know who you are leaning on for this , but I am in your corner on this one.

I am having a hard time straying from my C1 hammer on a 112 lSA because it is soo damn efficient, but I am tinkering with the thought of the new wave meat myself. Sometimes I wish MTI hadn't provided me with such a deadly streetable combo.

Please keep us posted. I feel a "I told Ya so" coming on. Good luck to ya!!!!

James

ms4

I say go for it. As stated before more or less, the tighter LSA will allow you to run higher compression. The valve overlap will bleed off some of the static pressure. run a 108 LSA and mill that head!!! oh and you'll have an awesome lope.

I always find it funny when I see people talk about "big cams" on the LS1 forums, then I read the specs and they are tiny. heck, I don't normally consider a cam big until it gets over 250ish w/ at least .6" lift. Someone has to start breaking new ground in the LS1 world! I think the downfall is that there aren't many available intakes to support the rpm range of the big cams.

Fireball

iTrader: (21)

there isn't much more I can do for compression short of changing pistons unfortunately. I'm now running 5.3L heads cut .040 inches. PV clearance is going to be somewhat tough to achieve with the cam specs I posted...but it can be done

Damian

iTrader: (89)

Phillip, with that kind of cranking compression you will blow a stock piston to peices in a matter of months. I would not recommend ANYONE running anything over 210 psi on a stock bottom end.

FWIW, I was running a 230/230 110 cam for a short while, with 5.3's decked .020, my car was making ~230 psi cranking and detonating so bad it threw off the wideband. If I would have driven the car a month longer i would have killed a piston(s).


Josh

ms4

but what if you were to increase the duration... say a 242/242 on a 110 ? think the extra overlap might bleed off some of that psi, enough to not detonate?

TEA Brent

I like the idea of a 109, I think it will suprise some people.

Pro Stock John

iTrader: (34)

That GM Grand Am cam was on a 106 and Nicky from SDPC and Joseph told me that the C5 idled at like 1250. 1250 would be very annoying after about a week.

Fireball

iTrader: (21)

thats why I'm going 109 and not 106

Camaroholic

iTrader: (1)

How will a 250/244 on a 109 +6 in a solid roller 346 sound? It'll be running this weekend... Hopefully have some dyno graphs next week.

-Andrew