cam question
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
I'm just about to do the same.
I have 3 sets of springs here now.
I replaced the Edels based on what they were supposed to be. When I took them to a local machin shop to swap with the Crane, he siad they tested the same. I said to use the Crane parts anyway.
A few months later, I get valve float (or what we thought was vlave float) at this shop I had tuning my carb. He measures one of the Crane, says "it is less than 300lbs open, and I definitely need more like 400 with the .607 lift. He says he can put on some stiffer Comp sorings. He never had much luck with the Crane springs." I'm a bit tired of wrenching, so I let him.
A few months later, I'm looking at broken pushrod cups.
I check the Comp part number on the web to see that I have about 430lbs open pressure. I call teh Crane techs to see if my lifters are good for it. He says yes, knowing full well what cam I am running an doesn't say anything about cam wear.
The Smith Bros tech thinks it's all good, as long as the lifters hold up and I got the right pushrod type and size.
I'm a bit tired of getting 4 different stories.....
I have 3 sets of springs here now.
I replaced the Edels based on what they were supposed to be. When I took them to a local machin shop to swap with the Crane, he siad they tested the same. I said to use the Crane parts anyway.
A few months later, I get valve float (or what we thought was vlave float) at this shop I had tuning my carb. He measures one of the Crane, says "it is less than 300lbs open, and I definitely need more like 400 with the .607 lift. He says he can put on some stiffer Comp sorings. He never had much luck with the Crane springs." I'm a bit tired of wrenching, so I let him.
A few months later, I'm looking at broken pushrod cups.
I check the Comp part number on the web to see that I have about 430lbs open pressure. I call teh Crane techs to see if my lifters are good for it. He says yes, knowing full well what cam I am running an doesn't say anything about cam wear.
The Smith Bros tech thinks it's all good, as long as the lifters hold up and I got the right pushrod type and size.
I'm a bit tired of getting 4 different stories.....
FE "Freakin Expensive"
Joined: Dec 2003
Posts: 6,461
Likes: 4
From: Smith Mountain Lake, VA
Well Greg..
Im just going to stay with my heavier Comp Springs...And say to Hell with it...IMO
I could see more wear with standard lifters... But..If you got valve float with the recomended springs...I'll take my chances with the heavy one's...Russ
Im just going to stay with my heavier Comp Springs...And say to Hell with it...IMO
I could see more wear with standard lifters... But..If you got valve float with the recomended springs...I'll take my chances with the heavy one's...Russ
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
I know that the Crane roller cams are a hard material. It's a requiremnet to get the Bronze? or hardened steel distributor gear when using these cams. (for you guys planning to run this cam, you'll discover a note in the box with the cam to upgrade your distributor gear) I asssume its' the same material on their biggest cams. If they can take the 500lbs at even steeper and bigger lobes, then my cam should be good.
We know the Ersons are rated for it. I guess it's the stuff in between to worry about. The pushrods for instance :-) Then the lifters. But Crane seemed to think their hydraulic roller lifters were good for it.
are we having fun yet?
We know the Ersons are rated for it. I guess it's the stuff in between to worry about. The pushrods for instance :-) Then the lifters. But Crane seemed to think their hydraulic roller lifters were good for it.
are we having fun yet?
Junior User
Joined: Nov 2003
Posts: 99
Likes: 0
From: Oregon
Say, 824x4, I'm a little late here, I apologize, but if you're still looking towards that 275DEH Comp cam, I'm runnin the 265DEH now and I gotta say it's got more oomph to it than the 255DEH, although Desktop Dyno had it a few lb/ft of torque lower. The 275DEH came up with 13 less lb/ft than the 255DEH at the same RPM with my setup, but also claimed somethin like 28 hp more around 500 RPM higher. In short if you're looking for a torquey cam, the DEH line is real good in my opinion, at least for 10:1 cr 
Last edited by JonnyB69; May 6, 2004 at 01:21 PM. Reason: stupidity
Posting Guru
Joined: Aug 2001
Posts: 2,117
Likes: 0
From: Evanston, WY
I just caught back up with this thread so pardon my late entry. I cannot imagine that they use different cam stock for the rollers v. hydraulic rollers. Ill bet they are the same material. Spring pressure on my (non-crane) roller cam is 500+ over the nose and 200+ on the seat. Your cam will not wear prematurely at the pressures you are generating. If they say the lifters are good for it, then run it and be happy.
-Scouder
-Scouder
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Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
Originally Posted by Scouder
I just caught back up with this thread so pardon my late entry. I cannot imagine that they use different cam stock for the rollers v. hydraulic rollers. Ill bet they are the same material. Spring pressure on my (non-crane) roller cam is 500+ over the nose and 200+ on the seat. Your cam will not wear prematurely at the pressures you are generating. If they say the lifters are good for it, then run it and be happy.
-Scouder
-Scouder
Why do they say to use a harder cam gear on the distributor with the Roller? Any ideas?
Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
BB, I think you are right, if I remember correctly.
There are 2 reasoons why I think the cams a harder material:
1. they require a harder dizzy gear
2. they cost about 3x the hyd. flat tappet cams :-)
anyway. I feel better about the stiffer springs. Just need to get the right cups on some harder pushrods.
still pending, getting my shortblock back from the shop...otherwise....screaming 352...
There are 2 reasoons why I think the cams a harder material:
1. they require a harder dizzy gear
2. they cost about 3x the hyd. flat tappet cams :-)
anyway. I feel better about the stiffer springs. Just need to get the right cups on some harder pushrods.
still pending, getting my shortblock back from the shop...otherwise....screaming 352...
Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
Roller cams are built on harder steel billets in order to withstand the higher unit loading pressures of the roller lifters, the ramps are a lot more aggressive than a flat-tappet cam. A lot of street rollers are now pressing on an iron gear to allow the use of stock-type iron dizzy gears instead of the softer and less durable bronze ones.
You mean smoking 352
You mean smoking 352
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