Phate

iTrader: (2)

Who did the heads on your car?

StevieZ

iTrader: (3)

I'm starting to think that I may be undercammed with my setup. I'm running a comp XE .232/.232 .575/.575 lift on a 114 lsa with +4*
This cam peaked on the dyno at 6100. I'm thinking of going to the Lunati 242/242 .595/.595 on a 112lsa with +4*

StevieZ

iTrader: (3)

Why so? What about a 4" stroke?

8POTS

I just held a simple belief that more cubes gave more torque but higher piston speed in a cycle offered slightly more that slower ones.
My question I guess to the 427 crowd is "how much cam is too much". I was thinking 244/244 112 570/570 would be perfectly streeable and still a good power spread. When does a cam start to be a 'pig' in these big motors? Is it possible...hang on ...hmmm...is it wise to go any bigger than this

Z-Rated

Does it have something to do with where the power peaks??

kumar75150

I still cant explain how I lost power going to 1 7/8" headers and 3" exhaust.

That confuses me more than anything else. I went out racing tonight and my car is about 3 car lengths slower with the new exhaust.

Heads were ported by local guy named Trevor JOhnson. He is very well regarded in the DFW area.

kumar75150

I'm real close to giving up on this car if it doesnt make at least 475 on motor soon.

Fenris Ulf

Cam timing has alot more to do with where the torque is produced than the stroke. My heads flowed less than 300 cfms at the max lift of my cam, but its the whole combo that matters. Shoot me an email, Kumar, I am in Dallas now and would not mind taking a look at the car to see if we can unlock some more power.

Fenris Ulf

Oh yeah, I am most likely selling my car, in case you are interested in stepping up to a better motor...

kumar75150

sent you an email dude

J-Rod

Kumar, those Cartek headers have casued several folks to loose power. Look over on CF. Neptune Bill and some other installed them, and then sold them. Bill told me he lost HP with them. I think big tubes are the way to go, but I think the primaries are too short.

As for Torque. A stroker makes more torque. An all bore motor can be made to rev higher (than a stroker ) as reduced stroke can allow for more piston speed. You can make the same power as a stock bore, but at a lower rpm with a stroker motor.

Let me back up to my gen 1 small block chevy stuff. Take a 350, put a 400 crank in it. You have a 383. A 383 needs good rod bolts, because at 5500 rpm you have the same load on the road as you do on a 350 @ 7000 because of the increased stroke. But, the motor makes tons more torque.

On the other hand , take the 353 in small block I have in my shop. It is a B/SM class motor and makes 780HP on a single 750 carb. It has a big, big bore and a very short stroke. The cam is around a .800 lift (no I am not joking). It makes power to 8800 and will rev to 9200. A stoker motor would have issues doing that.

Piston speed is you big issue, once you exceed a certain ammount of piston speed you are in danger of coming apart at the seams. Its like Winston cup and F1 both make about the same HP one is at 8000-9000 RPM, and the other is @ 19,000. But, if you do the math, they are nearly the same piston speed.

Again, torque is a twisting force. More stroke is a longer lever which allow for more twisting force.

Bore, is about more volume.

Put the two together and really, really cook....

Pro Stock John

iTrader: (34)

A motor with a 4.125 crank will have it's peak tq and hp come in a lot lower than a 4.000 stroke setup.

My 4.060 bore x 4.075 bore 422ci iron block made peak tq at 4200 rpms and pk hp at 5950 with a S1 (242/242//112). With my older 244/244/114 I peaked at 6150.

I honestly wonder what a 242/242//115/+2 cam would have done in my motor. 505rwtq at 4200 rpms is like crazy stupid tq when you have a 4500 stall. The power was sweet I could do 125mph with barely any pedal.

kumar75150

I am probably going to try new headers after the cam.

kumar75150

Oh yeah, I kinda knew I was giving up lot of top end power by not boring out the block but I just dont trust sleeves or bored out blocks yet especially since my car sees a lot of miles. Its my daily driver.

Pro Stock John

iTrader: (34)

I'd keep the big headers I wish I had used 1.875 headers with my old engine.

StevieZ

iTrader: (3)

I just ordered a set of Kooks 1 7/8" for my car. Hopefully I'll see some decent gains with them.

kumar75150

I'm going to try the bigger cam first of all.

If that doesnt do the trick, then headers, and then get more work done on the heads.

Fenris Ulf

I have yet to see a stroker motor make more tq than my allbore.

Kumar, it was nice meeting you today. I am sure it will be no problem at all squeezing some more power out of your car with the mods we discussed today. Don't worry, your car will be making better numbers very soon!

kumar75150

It was nice meeting you too. Thanks a lot for your help dude. Fenris Ulf's car not only has a badass motor, it is also very nicely done.

One thing I cant remember: do you think I should change my headers or not?

kumar75150

Oh ya, my friend and I detailed the car tonight but that prolly belongs in another forum.