L88 cam in L78?

[JLerum]

Waynes car weighs 3600lbs with driver. The car should be 160lbs lighter but because of the special drive shaft loops that he uses to protect the car their is the weight penilty.

His best MPH was 119.02! His reproduction cam is if I remember right is 6 degrees and 8 degrees less duration on the intake and the exhaust from the chevy grind and yes he is running the 12.5 compression.

JIM [img]/ubbthreads/images/graemlins/[/img]

[Casey Marks]

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...The car should be 160lbs lighter but because of the special drive shaft loops that he uses to protect the car their is the weight penilty....

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WHAT ? 160#'s in driveshaft loops ? The HEAVIEST loop that I have ever made was 11 lbs. That was a 5" diameter loop, with 1/4" thick plate, and gussets. What is he doing, running the shafts thru black pipe ? [img]/ubbthreads/images/graemlins/confused.gif[/img]

[JLerum]

Casey,


Because the car has independent rear suspension it is some what complex. He has 3 drave shaft loops. 1 for the drive shaft and 1 for each axle shaft(mini drive shafts). Than he has some kind of support on each side that would keep the tire (wheel assemble) from colapsing just falling over if their was a failure of the wheel bracing. When I asked how much it all weighs he said about 160 lbs.

Pete,

I saw the cam card and I thought I remembered 112 lobe seperation. The lifts were the same and the duration as noted above. I know that it was not a rapid lift cam by the lash that was recommended, .026 intake and .028 exhaust. The cam came from Bullet cams.

JIM

[John Brown]

Sam,

Just to reinforce Rob, Pete, and Jim's explanations of the effects of cam timing, lift and duration vs. streetability, let me say there are times when at work I have too much time on my hands (like today). I also have Desktop Dyno and Desktop Dragstrip. A couple of years ago I ran computer simulations of a friends car combination using factory big block cams and found that the less radical cams would make more usable power and give better E.T.s. After taking lots of grief from his "engine guru", he finally tried the lowly 375 horse 396 factory cam. Result, more power, lower E.T. and plenty of vacuum to run the power brakes. So if you have access, build your combination on the computer first, then buy the parts. You won't be dissapointed.

[JoeG]

Hello John,
Is that the DESK TOP DRAG & DYNO 2000 program ?---How do you like it?----------JoeG

[John Brown]

Yes, 2000. It's a good tool, not 100% accurate predicting E.T.s since we race on Repo Polys, but it does show trends. Makes it easier to see which direction to go on changes. I understand there are newer versions that are more accurate, but we are only looking for trends for predicting results.

[JoeG]

Thanks John--I just wanted to tinker with some different engine modifications and set up a cyber track car.--always wanted to pick it up ,just keep putting it off for one reason or another-----JoeG [img]/ubbthreads/images/graemlins/beers.gif[/img]

[Pantera]

You will hate the L-88 cam. My LS6 on the street is dangerious when you get up to 5G in third it will try to go sideways with N-50's. You will kill clutches if you get caught in traffic for a short while. With the right mufflers and Idle set at the right speed it willsound good and run good. More cam is just too much maintance. I have raced a small block in SCCA B/P and all my competion would run these wild cams and unless we were on a huge track with very long straits I could run all over them. The first corner we went through I caught them and passed them. They could only pull me 2 or 3 car lengths down the straights. I had more low end power off the corners and I didn't break the valvetrain but once. I ran a chev Offroad flat tappet cam that was almost 1/2" lift. They had roller cams to get the lift they wanted. I hold the track record at Hallett Ok with this setup. All my competion broke the valve train regulary and let me win. They over engineered their cars and reliabality is the key to keeping a car alive to make it home. To finish first you have to first finish.

How would you feel about dropping a valve through your pistons and destroying your motor?

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