I've been trying to post the sound of my AV8 roadster forever and couldn't get it to work.........operator error!!!! I'm just trying again................ If still don't work please forgive http://media.putfile.com/400jr-sound
NICE! (It worked) Can someone explain to me how adjustable lifters work? I'd like to put a big cam like this in my Flattie. Anything else I would need? Thanks, -Dean
Sounds great!!!!!! Dean, adjustable lifters have a nut on top that you use special wrenches to turn. You put your feeler gauge between this nut and the valve and set your adjustments from there. OEM lifters were matched to valves and the valve stems were ground down for proper clearance. If your changing your flatty cam your gonna probably want to put in new valve springs, an aluminum cam gear in place of the stock fiber one. And while you have it apart it's a good time to think about new valves and having the seats ground and valves lapped in. Not to mention valve seals on at least the intake valves. Some guys use them on the exhaust valves too. If you have a pre 48 motor your gonna want to change to the 8ba style valvetrain and guides.
Really lopey! Can you tell me why when you rev it up, rather than getting louder it takes on a muffler-like sound? Is it running through an exhaust dump or what?
Unfortunately, I can't seem to get the file to work. I get a dialog box that says, "The playlist format is not recognized." I'm using a Mac with OS 10.3whatever and I have tried Safari and Explorer. Any ideas?
Sounds great!!! I too noticed when increasing the RPMs the sound resorted to a sound in which it was going through mufflers. Thanks for sharing.
Thanks for the nice comments folks!!! Goober and PJ.....Yes the volume does seem to decrease as I rev it, I think it is two things, first, I think the recorder does indeed limit it for it's own self preservation and second, as the revs raise the engine is running smoother and less raspy and smoother sounding. It's running centerdump headers with 2 1/2" collectors into 2 1/2" straightpipes with 12" long modified motorcycle inserts in the ends. They were just quicky pipes to run when I finished it. I intended to get to a muffler shop and have some pipes bent and put some better mufflers on it. So many folks like to hear it idle at shows, cruise ins and the grocery parking lot and really like it. If I go mellow that idle will deffinately be less noticable. When I was modifying the inserts I was trying to get the sound like the flattys my dad raced in the 50s and it's very close to that right now. Thanks again,
Thanks Dean, To explain adjustable lifters a bit more I'd explain a little about high lift cams. Many/most are reground on a stock core. To obtain more lift they actually grind material off the heel of the cam. This actually increases the differential between the heel and the peek of the cam from the centerline. That differential is the actual "lift" or valve travel. Now, we have to fill the gap that was created between the lifter and the valve stem. One way is to add material to the valve stem or fill it up at the lifter side with a cap screw threaded into the lifter. When that cap screw is added, we also gained the ability to adjust the valve lash on a flathead by running the screw in or out. Too some , that's a pain, but its really nothing that having patience and paying close attention to detail won't get you through..........and you'll like the lopey sound all the more. Hope this helps,
Jon, Sounds great! We can compare our 400jrs. side by side at the Dean run; I think mine sounds similar to yours though I am running 2" thru Smithys and 3" echo cans at the rear.
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