what is a recomended seat pressure for a hotcam? with stock size valves-- in/1.05 grams , ex /95 grams , now I have crane 10308 springs installed @ 1.78/in ,was looking at crane web site and seen the springs in that kit (99893) is 130 lbs @1.850 installed , if mine is installed at 1.78, is this too much seat pressure for this cam and a daily driver?

 

anyone

 

How are you measuring what your installed height is, what components(retainer/locator) are you using?

But yes, any higher than 130# on the seat and you will bleed down the lifters.

 

seat pressure for this cam and a daily driver?
what is a recomended seat pressure for a hotcam? with stock size valves-- in/1.05 grams , ex /95 grams , now I have crane 10308 springs installed @ 1.78/in ,was looking at crane web site and seen the springs in that kit (99893) is 130 lbs @1.850 installed , if mine is installed at 1.78, is this too much

Ya got to measure.Guessing won't cut it.

I shoot for 130# AFTER break in. The springs will loose 20-25#lbs after a few heat cycles. Shoot for about 150# advertised at your installed height, and they will break in right.

A set of $500.00 springs won't but I dought ya got those.

Don't worry about the stock lifter's,they will be fine.

 

We only loose 10lbs on Isky springs.

 

Maybe, but they are not the one's that come with the Hot Cam kit and if ya are talking Toolroom springs they are spendy also and most people aren't running that quality of spring.
The Crowers that I usually run don't loose but 10-15lbs in 1000 miles but they are $500.00 for the springs and all the jewelery. Ya get what ya pay for.
I used to run 1.625 springs on everything to prevent the loss,but most people aren't aware or just don't do it 'cause of the expense.99% of people are going to put on barely enough to get the job done with no reserve and a 130#regular low dollar spring will wind up to be 105-110# or less when it's all said and done.

 

No - I'm talking standard isky springs, the 235-D, 6105, etc I only see 10 lbs loss over an extended time period. I only use the toolroom springs on our blown marine motors because they run them for years before a rebuild and they sit for long periods without use. I use the standard 6105/6205 on the circle track stuff because we change the springs out every season, when rechecking stuff they have only lost about 10lbs on a full season of racing. Our GTA cars get the Endurance 9000 stuff.

Not saying you are wrong by any means, just what I've seen is different.

 

Just as important is the rate per inch. With those springs, if they are NOT like comp cam 'slinkys', and actually measure close to advertised spec, you'd have your 150# to start, and have allowance for initial break in. (You'd have a bit over 155# at advertised spec., installed at 1.78".) At full lift, at spec, you'd have 360#. This is figuring you are using the 1.6 rockers with that cam. Again, some extra to allow for break in. You won't wind up with a max over the nose pressure of 350# after break in, but for that cam, you'll be a bit oversprung anyway. Anyway, using the mfr. specs, the full lift/installed hgt. pressures will be at about max for hydralics, until after break in. Hopefully, the lifters will hold out til break in is complete.

THE accepted method of installing springs, is having them checked on a good tester before hand, and setup with accurate measuring from retainer to head.

What was stated in posts above, was blunt, but I agree with it.

 

Gotta try um and see.