vavle spring question.
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
vavle spring question.
Cam is a hot cam, 0.525 lift.
Springs installed on head got this spec:
1.470 in. O.D. single with damper
120 lbs. at 1.780 in. installed height
300 lbs. at 1.280 in.
360 lbs. per inch spring rate
.540 in. max valve lift
Will it work or must I go "bigger"springs?
thanks
Springs installed on head got this spec:
1.470 in. O.D. single with damper
120 lbs. at 1.780 in. installed height
300 lbs. at 1.280 in.
360 lbs. per inch spring rate
.540 in. max valve lift
Will it work or must I go "bigger"springs?
thanks
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: vavle spring question. (devilfish)
The load over the nose looks a little low.
TPIS recommends P/N 700-132 for their ZZ-9 cam (.483"/.520" @.050"), which has 125lbs @1.80" and 357lbs @1.25".
What does GM recommend for the hot cam??
[Modified by 65Z01, 12:55 PM 7/7/2004]
TPIS recommends P/N 700-132 for their ZZ-9 cam (.483"/.520" @.050"), which has 125lbs @1.80" and 357lbs @1.25".
What does GM recommend for the hot cam??
[Modified by 65Z01, 12:55 PM 7/7/2004]
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
Re: vavle spring question. (devilfish)
imho, looks good, if your springs coil bind at .540 (or a tad more), then the .015" difference is morte than enough to be safe. usually springs can handle up to .030" more than their ratings.
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
Re: vavle spring question. (bradvette)
mm ok. I really dont whant to change the springs 
I thougt I whas ok with those springs... What is the spec on the springs that goes with the hotcam kit??
[Modified by devilfish, 7:40 PM 7/7/2004]
I thougt I whas ok with those springs... What is the spec on the springs that goes with the hotcam kit??[Modified by devilfish, 7:40 PM 7/7/2004]
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
Re: vavle spring question. (devilfish)
Is that .540 max valve lift, is that maximum safe lift, or is that coil bind?
Ideally you want to keep a .050 cushion between your cam lift and coil bind height. If your .540 is coil bind height and your cam is .525 you've only got a .015 cushion, which is very thin.
Ideally you want to keep a .050 cushion between your cam lift and coil bind height. If your .540 is coil bind height and your cam is .525 you've only got a .015 cushion, which is very thin.
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
Re: vavle spring question. (Nathan Plemons)
hmmm i dont know??
I think the springs that follow in the hotcam kit has this spec:
101# @ 1.78 install height
275# @ 1.255 (.525 lift)
332#/in spring rate
So "My" springs look stronger..
I dunno...
I think the springs that follow in the hotcam kit has this spec:
101# @ 1.78 install height
275# @ 1.255 (.525 lift)
332#/in spring rate
So "My" springs look stronger..
I dunno...
Thread Starter
Melting Slicks
Joined: Oct 2000
Posts: 3,010
Likes: 1
From: Sweden/Stockholm
Re: vavle spring question. (devilfish)
here are the spring spec that GM recommend for the hotcam: http://www.superchevyperformance.com...s/24502586.asp
look at the bottom..
look at the bottom..
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