Wesmaster

Are you sure there's actually a performance gain to having pushrods? Other than the timing chain/belt not having to power two cams directly, I don't really see how this would give more power. Feel free to teach me.

kumar75150

yea how bout those time slips?

Wesmaster

For those that are curious here's the primer I got on SOHC, DOHC and Pushrods:

http://www.howstuffworks.com/camshaft2.htm

Zoran

[QUOTE]Originally posted by Wisconsin S2k
[B]

shizon'00

I'm not saying that pushrod is better than OHC or DOHC. I'm just stating that pushrods have very flat torque curves (which we all know is good). I don't really know why they do, just that they do. I know that there are OHC and DOHC motors with flat torque curves also. That probably has more to do with cylinders than valve actuation though.

My point was that OHC technology wasn't really a good option for the vette considering the constraints and requirements to be met both space and performance wise. What I'm not saying is that the performance aspect couldn't be met, but the space could not have been met with the size difference in heads. OHC heads are MUCH larger than pushrod heads since they have to contain the cams and drives. So instead, GM improved it's pushrod technology so it could meet the performance aspect with the same amount of space.

Any engine dynamic engineers in here? I know there are some at the corvette forum that commented about this, but I forgot what they said.

Wesmaster

I totally agree with this, I'd just be curious to learn how the pushrod helps the torque curve, let me know if you run into any of the Vette guys that know.

cravnpup

I think the nice flat torque curve you're referring to is just a byproduct of the excellent design of the LS1 motor.. It really has nothing to do with OHC vs OHV... To simplify: 5.7 liters (OHV) + 2 valves per cylinder + excellent plumbing = Nice Flat Torque Curve
2.0 liters (DOHC) + 4 valves per cylinder + excellent plumbing = Very low torque curve but excellent high rpm capability...

jzr

[QUOTE]Originally posted by shizon'00
[B]Any engine dynamic engineers in here?

Wisconsin S2k

First of all I DO have the timeslip for my 13.795 run. It's actually at my local honda dealer (they run a performance shop and i am personal friends with the manager). Remember also that my tires are the S03's. And I do "feel" a slight difference launching. They seem to catch a little quicker off the drop. But I have been street racing since I was 16. And I have taken 3 performance courses in driving. I'd like to think I'm a good driver. Now I can get the timeslip but I just gotta get it scanned. Now... to find a scanner.....

P.S. I think I learned more about pushrods and LS1's, etc, in the last few posts than I ever have. thanks for all of the info. I love learning about cars. (even though I'm an import b*tch)

Wesmaster

Any tips on launching? I feel that I've got a lot of experience dropping the hammer in the S2000, but I don't think I could pull a 13.795 pass in a Stock S2000.