| Re: Cam and Rocker Question for the Gurus |
Subject: Re: Cam and Rocker Question for the Gurus by dan0617 on 2010/12/21 14:06:44 My block is a 1979 block. My hang-up on going roller is the $1000 it will take to do it, and the fact that I don't have a garage so any work I do will be outside. I'm also putting what car money is available into the interior and I'm saving for wheels. Also, spinning to 6500 or higher isn't what I want to do. I am making good power and have good track results with staying below 6200. Just want to capitalize on that. Going to a roller would be a great improvement but going to a roller that makes power up through 7K isn't worth it for me. The dyno chart above is awesome but with my HSR intake and 2800 converter the powerband is about 500 or so rpms too high. With my converter setting me back to 5200 rpms after a shift, that cam would likely be slower than the one I have now on a track. I have no desire to ever run a higher than 2800 stall because my car is 99% street driven. I am looking to get the most out of the setup I have now, safely, since it will be likely 2 years before I can afford a major setup change. Any money I can spend on the car I've put into some interior mods, and am saving for wheels. By safely, I mean I don't want to walk the ragged edge with timing or spray any bigger of a shot. Josh, I have considered doing alot of things but agree with you that it isn't worth it. Since my cam is lacking, I have considered doing the cam timing and 1.7 rockers though. At this point I think trying the 1.7 rockers is a for sure. Should see a decent gain there and won't cost much, especially if I then sell my old 1.6 roller rockers. Might not feel it in the seat of the pants but it should show up on a timeslip. My main question is on retarding the cam timing. I am not sure if I will lose vacuum, or how much bottom end will suffer. I don't want to turn it into a dog. Also, will it gain any power above 5000 rpms, or will it just move the powerband up? Searching the internet, some say it will move the powerband up, others say it might go up maybe 200 rpms but the peak power will be higher. Obviously, with my converter, power below 5000 means very little. 5400 to 6200 is where I want my power to be. If it gains power in that area it will be power used all the way down the track. If it just moves the powerband up, probably not worth it since the powerband isn't too far off of where I want it now. |
