LT4 spring install height ?
Team Owner
Joined: Jan 2003
Posts: 20,316
Likes: 246
From: Summerland B.C. Canada
Originally Posted by opel
The LT4 springs have a seat pressure of 101 at an install height of 1.780 what would the seat pressure be at an install height of 1.780?
Dave
Dave
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
I think Opel meant to say
In other words, what should the seat pressure be at a 0.030" lower installed height?
He recently asked at the end of his cam thread: Ok what cam do you think?
.
Now I have a question on LT4 springs @ install height of
1.780 the seat pressure is 101 pounds. What would the
seat pressure be at install height of 1.750?
1.780 the seat pressure is 101 pounds. What would the
seat pressure be at install height of 1.750?
He recently asked at the end of his cam thread: Ok what cam do you think?
.
Burning Brakes
Joined: Nov 2004
Posts: 781
Likes: 0
The LT4 spring is a relatively LIGHT duty spring. Another .030" might increase seat pressure to 110 lbs, certainly no more than 115 lbs. Even if it was 120 lbs this would be totally acceptable using the stock roller lifters with approximately 'one full turn' of preload.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
If you're using a cam with near .500" lift or more, don't do it. Otherwise, it should be okay.
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
Don't even **** around with the LT4 springs. At first I thought they'd be OK but after many discussions with 500hp and others on the forum they're pretty mild and BARELY up to the job with the Hot Cam.
Get these from crane , more seat pressure and rate at stock installed height (but not too much) and they fit better than the stock LT4 springs. Also you can use all your stock spring hardware.
Here's how they fit, I just got done installing them a while back. BTW, I've made a ton of 6500 shifts so far in my LT4 car with the stock spring hardware without a lick of trouble.
Get these from crane , more seat pressure and rate at stock installed height (but not too much) and they fit better than the stock LT4 springs. Also you can use all your stock spring hardware.
Here's how they fit, I just got done installing them a while back. BTW, I've made a ton of 6500 shifts so far in my LT4 car with the stock spring hardware without a lick of trouble.
Last edited by ALLT4; Aug 9, 2006 at 11:51 PM.
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Thread Starter
Burning Brakes
Joined: Oct 1999
Posts: 1,236
Likes: 91
From: Pittsburgh,PA
Ok that's what I get for posting after being up for 24+ hours. Slalom4me is correct I meant what would the pressure be at 1.750? This is not a LT4 engine or even a roller lifter engine, my cam should have springs with 114 seat pressure and the lift is 467/494 I think the LT4 springs would be a better choice than my current springs + I already have them.
Dave
Dave
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
Originally Posted by Corvette Kid
If you're using a cam with near .500" lift or more, don't do it.
Originally Posted by 500hp
Yes, I agree. The LT4 spring is at its absolute limit at the .525" lift of
the HOTcam (when installed at 1.780"). Anything over .500" lift I would
recommend a better aftermarket spring.
the HOTcam (when installed at 1.780"). Anything over .500" lift I would
recommend a better aftermarket spring.
these guys say.
What I ask is that you consider how much money you are looking at
for a spring that is more compatible and whatever loss there might be
on selling the LT4 set versus the cost of the consequences of sticking
with the LT4's and having an issue.
How much margin will there be before coil bind occurs?
.
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
Originally Posted by opel
Ok that's what I get for posting after being up for 24+ hours. Slalom4me is correct I meant what would the pressure be at 1.750? This is not a LT4 engine or even a roller lifter engine, my cam should have springs with 114 seat pressure and the lift is 467/494 I think the LT4 springs would be a better choice than my current springs + I already have them.
Dave
Dave
Originally Posted by Slalom4me
How much margin will there be before coil bind occurs?
Your installed height. 1.750
Coil bound completely. -1.1875
Gross max lift. .5625
Your max lift. .494
Margin. .0685
With 1.6 Rockers...
Your installed height. 1.750
Coil bound completely. -1.1875
Gross max lift. .5625
Your lift. .527
Margin. .0355
Stick with 1.5 rockers to provide the .494 lift, at .527 lift you're getting into a danger zone.
Last edited by ALLT4; Aug 10, 2006 at 07:16 AM.
