Cammed? Share your rev limit!

[Bodywerks]

Just curious what some of you cammed guys are revving to. Share your setup, provide if you could:
1. cam
2. springs
3. valves(stock, hollow stem, titanium)
4. pushrods
5. lifters
6. rev limit

I'm in the middle of my build:
1. Pat G custom cam motion 232/240 .654/.626" 110LSA +2
2. btr660 springs(opted to ditch the EHT 675/480lb springs due to being a little overboard on open pressure and finicky to set up right)
3. hollow stem intake valves, stainless exhaust
4. Manton 502 11/32 .120 wall pushrods
5. Johnson 2110 lifters
6. ????

I'm also running PRC255 heads, which will probably help with moving air up at the top, but I'm more concerned about valvetrain stability/longevity.

[BlueN20Camaro]

I always laugh at post like this. Perfect your set up. It almost seems as if you are comparing/copying/justifying your own choice. Go on YouTube and watch yolodouchbag on how guys "ask" to see fast cars set ups with a pencil in hand copying things,very funny

[Kings2010]

^^^ kinda of a dick post. Nothing wrong with asking the community for advice to avoid costly errors. Sheesh .......

[Bodywerks]

That's not it at all. My choices are already made, and I have a shift point in mind and I'm sure my tuner will be helping me out in this area as well. But that's 2-3 weeks away for me. I read all over about guys revving to 7400+ and I wonder what valvetrain components they have to keep up with those kinds of R's.
My shift point will be when the HP starts to drop off and my rev limit will be 200-300 past that. I'm thinking that will be around 6400-6500 for the shift and 6700-6800 for the rev limit, but maybe I'm way off.
Don't know what you mean about perfecting my setup. As far as I'm concerned there is no perfect setup. But I degreed my cam install and verified I'm within a half degree of spec. I checked PTV on intake and I'm within .005 of stock, at .075 and at spec of .100 on exhaust. I shimmed my springs to be at exactly the spec'd 1.780 install height, etc.
I'm just trying to get an idea of where others have there rev limits so I can get an idea where I'm going to be at, but thanks for trying to kill the thread...

[christianchevell]

SO you plan to immediately shift from one gear to the other to the next etc..... And its best to stay right at or just a little above the limiter preset for the car as the higher you spin does not mean the more you win it means more chance of valve float which in your case you will have with the springs being totally inadequate for the cams lift. With a .654 lift cam and .660 springs your valve train longevity should be about ....tick tick boom....at around 6800 or what ever rev your trying to shift......lol

I ran .675 springs on a .639/.623 cam with 235/239 and 112 LSA. the springs lasted until months after a bad overrev on the freeway with a 5-1 shift episode being cut off with the lousey factory shifter that would not go to third, and nut sitting on my front bumper. Then the springs went one at a time on my #2 intake, and that's all she wrote within ten miles say four months later ,( had a bunch of slightly bent pushrods too ). SO you want lift right at the limit of the springs go right ahead and ask BOZO the tuner how long he thinks it will hold together when you raise the limit up!!!! And that is a lot of lift requiring lots of spring pressure making it hard on the valve train and requiring spring checks and changes at intervals that increase in severity the higher you go so 20k...check and change springs, only with you.... at the limit for springs over revving .... one race check springs.... If your tuner was any good he would refuse to work on your set up. MY mods should read: Tuned by Thomas Wong best tuner in the N.W. and one who most likely would send you away for not wanting to be part of a disaster waiting to happen as that's bad when then the person gets on the net and bad mouths........ Not something you will find with him and his being a 1 man operation. Good Luck , sounds like with your mind made up your really going to need it.

https://www.facebook.com/Wongs-Perfo...-115667950915/

[Unreal]

7400rpm

Pat G LXL cam, 652 lift, 2.25 TI intake, 1.65 SS exhaust, PRC .650 springs, Smith bro 3/8 push rods. stock ls7 rockers, stock ls7 lifters

Typically you will run out of intake/manifold an power roll over well before 7k. So put it on a dyno, pull it to ~7k, and see what happens. Then set your limit from there.

[parkerss]

Originally Posted by BlueN20Camaro

I always laugh at post like this. Perfect your set up. It almost seems as if you are comparing/copying/justifying your own choice. Go on YouTube and watch yolodouchbag on how guys "ask" to see fast cars set ups with a pencil in hand copying things,very funny

You have missed his point. I will apologize for him and myself for not knowing everything like you. So ya your post makes you come off as D bag

[Pro Stock John]

Originally Posted by Kings2010

^^^ kinda of a dick post. Nothing wrong with asking the community for advice to avoid costly errors. Sheesh .......

Totally agree, why even bother typing that.

1. cam: GPI VVT SS3
2. springs: BTR
3. valves(stock, hollow stem, titanium): LS3 hollow
4. pushrods: Don't remember but aftermarket
5. lifters: LS7
6. rev limit: 7400 just in case

[SSBUSDRVR]

Probably Apples to Oranges here since most if not all of you guys are 1/4 guys Have a great tuner and builder here. run 1/2 miles,Engine is built to take the higher RPM (416) and he sets it at 6800 at Field Said he can bump it up to 7000-7200 but not really going to help. I'm at at 6700 right at the 1/2 on the Stock Rear Gear. Next event going to be Spraying for first time and on new Shoes so may change the whole ballgame.
Mast LS7 Heads
VR Spec Cam
BTR Valvetrain Parts
Morel ProBarLink High RPM Lifters

[SPCBA]

I have my cam and entire heads done for road course hobby, I can rev much further than I make power and my limiter is set with that in mind.

[willhe64]

Originally Posted by SPCBA

I have my cam and entire heads done for road course hobby, I can rev much further than I make power and my limiter is set with that in mind.

Perfect. This is what you need to do. Makes no difference if your valves won't float until 7400 when your power drops off at 6500.

[BFASTNOTLAST]

OP...

My cam is just a bit larger duration with a tick less lift than the one you have listed.

I run PSI ML1511 Beehives
BTR 5/16 PR
LS7 lifters
Stock LS3 heads for now, going to the Johnson 2110 lifter when I switch heads.
I make peak power at 6500, I shift at 6900 and I see 7300 in the log consistently.

No issues here so far. You should have a stout piece when you're done.

[christianchevell]

6800 sounds like a good number for gain from the stock limiter versus the hp/torque bands as torque and hp always cross on the dyno at 5250 the torque should still be high and not falling off too much : as peak hp numbers do not mean they are the best speed for the optimal shifting of the car just when the peak hp is compared to the torque moving it also. My limiter is set stock because I also have a larger rotating assembly and the stroke already is making so much torque its great and Wonder what my numbers will be, I do have hope to shift for speed somewhere having the shift light in the 5500-6000 ish for first to second some day and about that for the other gears, right now I am still breaking in. I do have about 600 miles on it and I have gotten on it a little more.
I worry about springs as they are the backbone of the upper valve train and then there is the dang trunions, I think I am going to some time buy a set of factory rockers with bushings as right now I am on comp cam upgraded. SO I went milder on my cam and spread the LSA more advanced 4+ timing also and got .650 springs as the higher the pressure the more likely it seems to break and TSP told me they had a lot more of the .675s break than the 20x more .650s they sell so milder can be better for longevity and I understand wanting a milder spring..... Just remember your setting the upper limit that you may bounce off of and do not want to even be close to float. And the higher you REV the shorter the life of the springs is usually the thought. Good luck me myself I cant wait to get a couple thousand on my engine and get it tuned again on the dyno hooked up & broken in so it can rev. that high. , its initial tune was done on the dyno but it was as the engine was being broken in on it and you only go so high in revs braking a engine in at varied engine revs and so my tune may need a little tweak but it feels spot on right now. I just tap the throttle and it roars...

[Joseph1LE]

For the average (key word there) cam only set up, spinning to over 7k offers absolutely zero benefit. Set it only a couple hundred RPM past where the HP curve starts to fall off.