Valve Springs?

[TucsonHooligan]

Machine shop was supposed to put on 289 valve springs, but they put on Sealed Power VS1630, which are for a ford V6 from 1995. These are the specs.

Wire Diameter 0.17 Coils 6.8 Closed Height 1.5 Closed Press 98 Open Height 1.15 Open Press 177

Stock spring Specs: closed (54 lbs) open (150 lbs) coil bind (.430) range (up to 260 dur) max lift (.480) inst hgt (1.68)

289 spring Specs: closed (60 lbs) open (175 lbs) all other specs are user verified

302 spring Specs: closed (80 lbs) open (200 lbs) all other specs are user verified.

Also, on the head, they wrote " 85 pounds at 1.600" and ".530 coil bind". The head has been milled for a 9.0 : 1 compression ratio. Zero deck with a 59cc chamber on a newer, bigger 1978 head. Standard rocker assembly, and a 112 264 single pattern cam, which has 450/450 lift at 1.5. Are these springs too stiff for my application? And will the standard pushrods be fine since the lifters are hydraulic?

 

[JackFish]

I don't think they're too strong for the job, just as long as they fit correctly.
http://classicinlines.com/springs.asp
I'm running the single damper springs from Classic Inlines on my my 264/274 cam.

That's quite a voluminous combustion chamber for a 9:1 CR, isn't it?
How thick is the head gasket?

 

[rbohm]

8) if the springs they used are set at the specs indicated, you are good to go.

 

[TucsonHooligan]

Zero deck and a .055 gasket. Seemed big to me as well. Whats the equation to figure CR?

 

[TucsonHooligan]

http://www.bgsoflex.com/auto.html


Input Parameters Are the Following:

* Cylinder head Volume (CC) = 59.00
* Piston Top Volume (CC) = 0.44
* Cylinder Bore (Inches) = 3.7
* Cylinder Stroke (Inches) = 3.13
* Deck Height (Inches) = 0.000
* Head Gasket Thickness (Inches) = 0.055

Computation Results:
# Computed Compression Ratio is 9.1 to 1

Those are my results from that website. A little more is lost due to the head gasket bore being larger than the actual cylinder bore, so that 9.1 may be closer to 9. The gasket squish is only about .005 from what I understand. Do those numbers look correct? Can someone check my work? The bore is .060 over and the pistons are dished, the .44cc's is what I got from the handbook at the machine shop. Let me know if I'm correct here or if I went wonky somewhere.

 

[rocklord]

http://www.bgsoflex.com/auto.html


Input Parameters Are the Following:

* Cylinder head Volume (CC) = 59.00
* Piston Top Volume (CC) = 0.44
* Cylinder Bore (Inches) = 3.7
* Cylinder Stroke (Inches) = 3.13
* Deck Height (Inches) = 0.000
* Head Gasket Thickness (Inches) = 0.055

Computation Results:
# Computed Compression Ratio is 9.1 to 1

Those are my results from that website. A little more is lost due to the head gasket bore being larger than the actual cylinder bore, so that 9.1 may be closer to 9. The gasket squish is only about .005 from what I understand. Do those numbers look correct? Can someone check my work? The bore is .060 over and the pistons are dished, the .44cc's is what I got from the handbook at the machine shop. Let me know if I'm correct here or if I went wonky somewhere.

Be careful about rounding up, or rounding down your numbers.
If your overbore is 0.060, then use 3.74 as the cylinder bore; also the stroke is 3.126, not 3.13.
With the other values you supplied, and the ones I stated above, along with a gasket bore of 3.81, I calculated your CR at 9.07 to 1.
Your displacement would be 206cid.

Your calculations are correct.

 

[TucsonHooligan]

I put the correct numbers in as you stated, it was actually the calculator itself that rounded them. Good, I know I'm on the right track then. Thanks for the help!

 

[JackFish]

Bowling's Compression Ratio Calculator
Input Parameters Are the Following:

* Cylinder head Volume (CC) = 59.00
* Piston Top Volume (CC) = 0.44
* Cylinder Bore (Inches) = 3.2
* Cylinder Stroke (Inches) = 3.13
* Deck Height (Inches) = 0.000
* Head Gasket Thickness (Inches) = 0.055

Computation Results:
# Computed Compression Ratio is 7.1 to 1

hmm, i don't get the same numbers what did I do wrong here?
Here's another calculator:
http://falconperformance.sundog.net/compcalculator.asp

edit: ah never mind - cylinder bore. That calculator rounds things oddly.
I am curious about these .44 dished relief pistons, have you got a part number or something?

 

[TucsonHooligan]

No number on em. The machine shop ordered them, we used the catalog to look up the part number and get the cc's of the dish.

 

[JackFish]

I am interested because I only know of flat top, 6 or 7cc IIRC, and 12cc dishes.
So specifics would be great if you can get them because it's nice to have another option when we have so few to start with.

 

[TucsonHooligan]

I'll see if I can find the old receipt and get the info.