[bowtie_nut]

I just bought a new set on Com Camp valve springs, and the seat pressure is advertised as 112 pounds @ 1.900, but measures 80 lbs. Is there a chance that the box was marked wrong, or that the wrong springs were packaged in the wrong box? Thanks

 

[hotrodg726]

I just bought a new set on Com Camp valve springs, and the seat pressure is advertised as 112 pounds @ 1.900, but measures 80 lbs. Is there a chance that the box was marked wrong, or that the wrong springs were packaged in the wrong box? Thanks

did you measure the installed height?? sounds like the height is too big.

 

[bowtie_nut]

Yes. The installed height is supposed to be at 1.900, which is what the heads call for. The open pressure is about 50 lbs light too. In order for these springsites to achieve the open pressure needed, they would be real close to coil bind.

 

[hotrodg726]

OK so did you measured the distance between the retainer and spring pocket in the head and have 1.900?? just because they said the heads were set up for a 1.900 spring height doesn't mean they are at that height out of the box. most heads require a shim or 2 to get the advertised installed height you will have to add a shim or spring locator to get the height correct. by the math the springs are 32# off where your at right now. probably a .060" shim will get the pressure there.

 

[bowtie_nut]

I have them set at 1.900 on the heads, and I I do have about 040 shims under the valves. Can I add some more shims under the springs to get the required pressure needed?

 

[hotrodg726]

yes but try not to have more than 2 if possible. also consider an ID locator as a replacement for the shim they are .060" and help with stability by keeping the spring from walking around in the pocket.

 

[63chevytoo]

I know most people put springs on and pay no attention to the height. Maybe that's why so many cam lobes are wiped off... The Unknown.

This may sound meticulous but.....

Did you check the height on each valve? It is not that easy and accurate without a gauge. The height will not all be the same.
That's why most of the time all the shims are not the same thickness for each spring adjustment.

Don

 

[techman441]

These springs are wrong for your application, send them back and get the correct spring or you will have trouble down the road later..

 

[bowtie_nut]

I am checking every valve. Most are the same, but others require more shims. I bought these springs because of the advertised pressure, but had a big surprise when I checked them. Seems like they would be close, but no go.

 

[63chevytoo]

I am checking every valve. Most are the same, but others require more shims. I bought these springs because of the advertised pressure, but had a big surprise when I checked them. Seems like they would be close, but no go.

Make sure your measuring error is not greater than the thinnest shim.:tu

Don

 

[bowtie_nut]

Make sure your measuring error is not greater than the thinnest shim.:tu

Don

Thanks. I'll let you guys know how things work out.