Patrick G

iTrader: (14)

remember, some of the most popular LS1 cams are reverse splits (more intake duration than exhaust duration) at some point in their function. Take the FMS F-13. According to the Cam Doctor it looks like this:

___________________________________________ 0.006 0.050 0.200
Intake Duration - ID_______________________ 281 230 150 F-13 INTAKE
Exhaust Duration - ED______________________ 285 232 148 F-13 EXHAUST
Lobe Center Angle - LCA (also known as LSA) 112 112 112
Intake Centerline - ICL____________________ 108 108 108


Intake Valve opens - IVO___________________ 32.5 7 -33 BTDC (- indicates ATDC)
Intake Valve closes - IVC__________________ 68.5 43 3 ABDC
Exhaust Valve Opens - EVO__________________ 78.5 52 10 BBDC
Exhaust Valve Closes - EVC_________________ 26.5 0 -42 ATDC (- indicates BTDC)
Exhaust Centerline - ECL___________________ 116 116 116
Overlap____________________________________ 59 7 -75 degrees

Notice how there's more intake duration at .200" lift than exhaust? And since the heads are most effective above .200" lift, I'd have to say reverse split cams shouldn't be dismissed as being ineffective too quickly. Funny how so many on this site get caught up in duration at .050" only and fail to look at the big picture.

FWIW, my Thunder Racing TRak cam is also a reverse split cam at .200" (157/155). Works for me!

TAQuickness

iTrader: (28)

Cool! I hope this thread goes the same direction as the Cam Discussion threads.

Great Information - Thanks for sharing

cyphur

iTrader: (10)

As usual more good info Patrick

Nine Ball

iTrader: (38)

I had the MTI X1 (230/227) in my last SS, and it pulled 10 rwhp higher than any other heads/cam combo at the same dyno day....and I did it with cats on the car and a factory 3" catback. There were quite a few cars that day with huge loping cams and offroads and cutouts, etc...

Bigger isn't always better. Louder isn't faster. Reverse splits work great.

JRracing

iTrader: (35)

My TR230/224 has worked great for me also.

PREDATOR-Z

My Stealth II 224/220 has been awsome, even on nitrous.

Ed Curtis

I think you need to check the lobe "area" too Patrick... That's the real tell tale sign for a R/S profile...

Ed

1CAMWNDR

iTrader: (21)

Am I right in assuming that a reverse split cam will not give up much if any low end (idle-3,000 rpm) torque? I like the idea of a custom 234°/228° with say .598"/.589"ish lifts on a 111° IC +3° (108° IC) . Kind of right between the TR 230 and 236 reverse cams with more lift .

Grimes

iTrader: (3)

nice info. not to be a stickler, but if you use the "code" tags you can get nicer looking charts that are eaiser to follow (keeps spacing of all characters equal):

tried to make it clearer patrick. thanks for your research also!

Bryan @ Speed Inc.

iTrader: (19)

i like my stealth 2 as well

gollum

iTrader: (1)

Our plastic OEM LS6 and PORTED FAST intakes simply will not flow enough air to make the AFR 205 head perform to its full potential much less the AFR 225's potential. So using reverse split cams with our restricted intake sounds good on paper any way.

gollum

iTrader: (1)

This affordable $279.50 Patriot cam cam looks very interesting to me.

232/230@.050, 110 lsa .580 lift

gomer

iTrader: (13)

I did some of the pre-production testing on that cam. I'll look for the dyno graphs from it. I do remember it being a choppy idling sob.. lol.

gollum

iTrader: (1)

Have you found those dyno graphs yet?

JaSSon

iTrader: (11)

I more than happy with my X1. I keep wanting to go bigger but I keep talking myself out of it.

frisky2101

iTrader: (8)

I just installed the same cam, and am very very happy

Beast96Z

iTrader: (21)

It all depends on the set-up. One must also look at the complete profile of his set-up before determing a givin lobe.

Patrick G

iTrader: (14)

Absolutely! It's best to use a combination that works in harmony with the sum of the other parts. I just think it's interesting to see the wide variety of cams that make big power in these LS1s (forward split, single pattern, reverse split). Ed Curtis made a great point...you really have to look at the total lobe area under the curve too...it tells you even more than the duration number.

JS

iTrader: (4)

Do any of u cam professors race your cars
I've been 10's ON MOTOR with an off the shelf TR 224 no big cam profiles,secret under the curve horse manure,lobe design bs....Just an off the shelf TR cam

PREDATOR-Z

In what?
A 3150 pound car with an A4 and a 4400 stall?