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Edelbrock and Summit cams are made by... |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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I have the 204/214 in my 68 AMX with mostly stock 390 and have to agree that it works fine.
For the last few years I've been putting together a hydraulic cam selector to help folks pick off the shelf hydraulic for AMC V8's. It normalizes the advertised durations from all the cam manufacturer's so you can directly compare them, calculates Hydraulic Intensity, overlap at 0.006" & 0.050", overlap triangle, DCR, etc, and trims downs a huge list of all of the available off the shelf cams to match your criteria. It's pretty fun actually. You can graph two cams to compare them, and advance or retard them or try different rocker ratios to see how they impact the shape of the curves. Once I get it done I'll find a way to serve it up to everyone on the forum. What's interesting to me though is that based on my engine combo, usage, etc, one of the cams that it picks for me is the little Edelbrock. I bought it 15 years ago just because it was cheap and close to stock. |
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1968 AMX 390 w/T5
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Online Points: 7901 |
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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I agree with you there. It seems that the Comp stuff ramps too quickly to guarantee 100% success in every old engine that gets rebuilt. If there's any offset or wear in one of the lifter bores the cam eats a lobe.
There's some middle ground out there though. A number of cam companies are using faster ramps than the old grinds but less aggressive than Comp. Howards even has a cam that they guarantee for 5 years, no matter what. Drop it on the floor, run it without oil, whatever, they replace it. For $230 you get cam, lifters, and ZDP break in goo. Howards also has a few dedicated 0.904 grinds for AMC, but they don't have the stupid fast ramps of the VooDoo or Xtreme, so they shouldn't be as noisy or as likely to eat themselves. And they're made Wisconsin like my car was.
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1968 AMX 390 w/T5
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Sonic Silver
Supporter of TheAMCForum Joined: Nov/23/2011 Location: East Tennessee Status: Online Points: 7901 |
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It seems to be essentially the same exhaust lobe as the Edelbrock, but the intake opens 3 degrees earlier, closes 7 degrees later, and has .030 more lift. Edited by Sonic Silver - May/03/2016 at 9:28pm |
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19610 |
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Ya know, if you call one of the cam companies they will grind whatever you want as long as they have a blank with a lobe separation/shape that can be ground to handle it. Or regrind one you send in. Lunati reground a 196 OHV cam for me years ago. A couple people who like the Xtreme Comp cams but didn't want the high lift in a 258/4.0L have had them reduce lift so they could run a lighter spring and not need off-road oil or an additive. The fast ramp still needs a bit more spring than stock, but get over 300# per inch on a valve spring and you need special oil or additives. Under that is usually fine with off the shelf oil with low high pressure additives.
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Frank Swygert
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Greyhounds_AMX
AMC Addicted Joined: Nov/14/2009 Location: Kansas City Status: Offline Points: 1268 |
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That's a good point Frank, but most folks will still just buy something out of the catalog. Given a choice, I'd work with Mike Jones for a cam. But since I've always wanted to know more about cams I started my little (big) cam selector project and it's been a good learning experience so far. |
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1968 AMX 390 w/T5
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mramc
AMC Addicted Joined: Jul/12/2007 Location: United States Status: Offline Points: 3217 |
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I'm not at all surprised that Crane made camshafts for Edelbrock and others. I've always thought the cam choices for AMC V-8 were rather poor. I look forward to seeing what happens to the cam selector. I do think it would be good if some one designed a camshaft especially for an AMC V-8. Camshaft design is considered part engineering and part magic by a lot of people. One last note the stock AMC family camshafts were all rather weak, usually in the 260 to 266 duration area even for the classic muscle car years and the AMC engine still made good power normally giving up 20 degrees duration to the big 3 in the classic muscle car era. LRDaum
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LRDaum
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