Updated spring recommendations for Crane cams!
Thread Starter
|
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Updated spring recommendations for Crane cams!
I was looking over various Crane FE cams, and it seems they no longer recommend the 99837 springs for all their FE cams. For the cams I looked at, including the one I'm using in my 390, they now recommend stiffer springs.
Here's the spring recommendations I found:
Crane 901: 96801
Crane 941: 96801
Crane 521: 99896
Crane 541: 99896
Here's the specs for those two springs:
99837: 106# @ 1.8", 280# @ 1.25", 320lbs/in rate
96801: 114# @ 1.8", 266# @ 1.3", 310lbs/in rate
99896: 150# @ 1.9", 560# @ 1.15", 528lbs/in rate <-- This is a dual valve spring.
Greg should find this interesting...
Here's the spring recommendations I found:
Crane 901: 96801
Crane 941: 96801
Crane 521: 99896
Crane 541: 99896
Here's the specs for those two springs:
99837: 106# @ 1.8", 280# @ 1.25", 320lbs/in rate
96801: 114# @ 1.8", 266# @ 1.3", 310lbs/in rate
99896: 150# @ 1.9", 560# @ 1.15", 528lbs/in rate <-- This is a dual valve spring.
Greg should find this interesting...
Cargo Master
Joined: Aug 2000
Posts: 2,931
Likes: 12
From: SW Michigan
about time
Guys, it is about time. I have always wondered how Crane ever came up with some of the spring recommendations that they previously had. Looks good so far, after those guys running juice rollers complained for the last two or three years. Better late than never, I suppose. I think the 99896s may be just a bit heavy for the '521 hydra-roller, but too much is better than not enough when it comes to valvespringing. DF, @ work
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
I agree its about time fixed up there info. They having working on it for over a month.
Hey, Kurt I redid some of my calcualtions for rpm range. Looks like my max rpm was around 5691 for the 99837 springs at 1.785-1.805 installed height.
1st gear 57mph 5691 (all she wrote)
2nd gear 85mph 5038 (all I have taken it so far)
3rd?
I promise I will be getting a new tach in the next two weeks.
Hey, Kurt I redid some of my calcualtions for rpm range. Looks like my max rpm was around 5691 for the 99837 springs at 1.785-1.805 installed height.
1st gear 57mph 5691 (all she wrote)
2nd gear 85mph 5038 (all I have taken it so far)
3rd?
I promise I will be getting a new tach in the next two weeks.
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
you are right Kurt, I know its falls off after 5000. 4500 to 5000 is not much of increase in power. when looking for max accel i would idealy shift around 4500 as the torque is falling off and the peak horsepower is close.
4500 377hp 440tq
5000 385hp 405tq
I think the 99837 springs are weak, the 91 lbs at 1.800 is a little off the 106 that crane says but the spring are suitable to 5300-5700 rpm I guess. I don't know if your cam would allow the motor to turn more rpm or not. You are probally not a ******* like me.
4500 377hp 440tq
5000 385hp 405tq
I think the 99837 springs are weak, the 91 lbs at 1.800 is a little off the 106 that crane says but the spring are suitable to 5300-5700 rpm I guess. I don't know if your cam would allow the motor to turn more rpm or not. You are probally not a ******* like me.
Thread Starter
|
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Well, if ******* means chicken, then yes, I'm there! 
I haven't even tried manually shifting mine yet. In drive it shifts somewhere between 4500 and 4900. But it's still building power. I'm just afraid of going to far, finding neutral, and blowing the thing up.
I haven't even tried manually shifting mine yet. In drive it shifts somewhere between 4500 and 4900. But it's still building power. I'm just afraid of going to far, finding neutral, and blowing the thing up.
Thread
Thread Starter
Forum
Replies
Last Post
jimcar-9
1948 - 1956 F1, F100 & Larger F-Series Trucks
25
Apr 18, 2014 10:24 PM
1972-34ton
1967 - 1972 F-100 & Larger F-Series Trucks
9
Mar 18, 2012 11:29 PM
Furyus1
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
6
Feb 20, 2010 11:52 AM
Dominatorstang
1987 - 1996 F150 & Larger F-Series Trucks
1
Sep 20, 2008 09:14 PM
oldblue31
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
1
May 21, 2005 08:13 PM
