dame

iTrader: (3)

Cam guru's whats the equivilent of a 224/224-114 LSA in a stock cubed LS1 compared to a 408 stroker?? SERIOUS question
PLEASE no flames, Im asking this simply because 224/224-114 is the biggest I'VE SEEN pass smog here in Ca. and Im about to build this motor and i want it to pass the EMISSIONS part of the smog test (not worried about the visual)

pkincy

iTrader: (1)

Can't definitively answer that yet, but I put the TSP 233 torquer in my 402. My 224 TR on a 114 did smog in Kalifornia. I am now installing the 402 but will smog in Nv which is only an ALDL test.

If you like (it costs about 29$ here) I will happily have one of the stations put the sniffer in it after my ALDL test, if they will do so.

I would guess something in the mid 230's would be equivalent in that big a motor.

Perry

Cal

iTrader: (1)

When it comes to emissions, a 224 is a 224 in any engine.

cyphur

iTrader: (10)

Cal I would think more cubes would eat up more cam. a larger cam, if the VE's were similar to a 224 considering the ratio between the cam specs and the cubes of the motor, could achieve the same results. is this not the case?

Cal

iTrader: (1)

I think that is true when it comes to driveability, but not emissions. Big engines just have more torque period, so they don't lose as much streetability with a given cam size. But a cam with 230 degrees of intake duration still holds the bigger intake valve open for 230 degrees, while it's bigger piston travels down on it's longer intake stroke. And it will still have the same intake/exhuast overlap as the smaller engine, just blow even more raw fuel into the exhaust system with it's bigger pistons.

dame

iTrader: (3)

where's a jrp when ya need one ..... LOL

cyphur

iTrader: (10)

that makes sense, i didn't think of it that way. good point.

edit.....Cal did a pretty good job of explaining this one imho. jrp has lots of answers, but he'll be the first to admit he doesnt' have all of them.

CHRISPY

A larger motor WILL help a larger cam pass. The biggest difference is at idle. There will be less misfires (HC) from the larger displacement vs a smaller displacement engine with the same cam specs.

With good cats a larger (relatively) cam in a 402 should pass easily.

Juiced

iTrader: (2)

a larger motor will be able to use more of the cam and burn the fuel efficiently, thats why the new ZO6 will be able to run the cam and still pass smog because there is less raw fuel and hydrocarbons exiting the car.

GuitsBoy

iTrader: (4)

So how DOES a big cube motor react to a relatively small cam? Would a 224 perform like a stock ls1 cam? Would a f13 or torquer perform like a ls6 cam? Would a t-rex equal a 224? Will a 224 in a 408 still lope as much as a 224 in a 346, only at a steadier pace, meaning it wont lope erraticly? Also how would it affect the 408 if you threw in a 224 with 1.8 ratio rockers. That would put the lift around 600 without really increasing the duration? (technically not increasing the duration at all, only getting above the .050 mark earlier due to the added lift)

Cal

iTrader: (1)

Probably true if the larger motor is still using the same size heads (valves) as the smaller motor it is being compared with. Most bored/stroked LS1's are not going to have valves and ports proportionatly bigger to go with the new displacement.

No way is a T-Rex going to equal a 224 though!

dame

iTrader: (3)

In case some of you are a little confused..... I wanted to know how big of a cam could I go in a 408 (with afr 225's) that would be comparible to a tr224 on a 114 in a STOCK CUBIC INCH LS1 which is what i KNOW will pass cA. SMOG. This car WILL have 1 7/8 headers WITH CATS btw.

jrp

iTrader: (16)

keep the overlap in check 0 < and tune and you should be good.

11 Bravo

iTrader: (3)

A guy here who I haven't seen in awhile put a TR224 in his 427. It made something like 450/450 and he said it idled smoother than stock.

dame

iTrader: (3)

yeah but how big? of all the responses i thought i'd get a good one from you

jrp

iTrader: (16)

crunch some numbers

int duration + exh duration / 4 , - lsa, x2

dame

iTrader: (3)

234+236/4, - 114 x 2 = 7

so.... is this good or no? LOL

jrp

iTrader: (16)

a tr224 114 has -4*, stock 98-00 cam has -36*. ls6 cam has ~-23*

my cam 16*

DavidNJ

232/232 118/+4 = -4 also

So if a 224/224 114+4 can pass, can this pass? Which would be better? IVO and EVC is the same. Just IVC and EVO are 8 deg latter and earlier respectively.

dame

iTrader: (3)

118 lsa i would have to spin this thing to the moon wouldnt i????