A...cómo se hacen las cosas...
Extraído del manual técnico de la GM, en su venta de motores para el "Circle Track"...
Página 21...
Valve Spring Specifications
Below is
illustration of a typical valve spring. Match up the locations and engine part
number with the chart below for the correct specification.
Note: These
specifications are for new valve springs.
The specification
chart shows free height, installed height, spring o.d., installed pressure,
open pressure, etc.
Keep in mind that
new spring pressures have some variances. The chart notes the two important
variances. Installed pressure & open pressure.
Valve spring
pressures will change depending on length of time engine is in service,
temperature during that period, and if the engine has been excessively
overrevved.
It is acceptable to
add maximum of a .020”
shim when valve seats are recut or to
get spring
pressures back to proper factory specifications. Care must be taken to make
sure retainer to
guide clearance is adequate.
No Titanium Retainers Allowed.
Valve
Spring Specifications - New
Description 88958602
/ 19258602 88958603 88958604
Valve
Spring P/N 10212811
12551483 12551483
Diameter
(A) 1.250"
1.32"
1.32"
Free
Height (B) 2.021" 2.145" 2.154"
Installed
Height (C) 1.70"
1.78"
1.78"
Lbs
@ Installed Height (+/- 4 lbs) (D)
80 lbs 101 lbs 101 lbs
Open
Height (E) 1.270" 1.300" 1.300"
Open
Pressure (+/- 8 lbs) (F) 195 lbs 260 lbs 260 lbs
Coil
Bind (G) 1.20"
1.21"
1.21"
Wire Diameter .177" .178" .178"
Los datos son bastante claros, como para traducirlos...lo único que se podría decir es, que los americanos plus ultra, identifican los motores con una serie numeral, pero se entienden entre ellos abreviando la numeración, por lo tanto, los denominan 602, 603, 604...
Bien, hasta aquí un pedacito de algo a controlar...pero, que controlan...controlan...
Valve
Spring Inspection Procedure
This section helps
identify those teams that have changed valve springs in an effort to gain additional rpm’s. It is
important to keep rpm’s within GM recommended numbers. Engine life and wear is severely
reduced for every 100 rpm’s that an engine is over-revved.
Purpose
Check for proper
stock valve spring specifications. Use Moroso p/n 62390.
Step 1. Have the crew chief remove all debris in and
around the engine
Step 2. Have the crew chief remove the valve cover
being careful not to contaminate the cylinder head
Step 3. Have the crew chief remove both rocker arms
from the selected cylinder & make sure piston is at BDC.
Step 4. Slide the Moroso valve spring tester into
position so that intake valve
spring sits in
tester pocket
Step 5. Pull the handle to compress the valve spring
to full compression and
note the reading.
Repeat the test for the exhaust valve spring and note the
reading
Step 6. Refer to chart in rebuild section for correct
valve spring pressures for the intake & exhaust.
Use the space below
to reference the numbers for your application.
Int.________ Exh.________
En el procedimiento a la inspección de los resortes de válvulas...bien clarito, lo dice...el tema son los "perreros"...y esta jauría, quiere rajar rápido, tanto allá, como acá...pero los yanquis están en todo...y la herramienta la tienen...
Por las dudas, y más clarito...
no me van a decir, que algún pichicho no entiende...
Algunas veces, tendría que preguntarse uno, si emular, imitar, copiar...es lo mismo...
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