|
Home > Engine
> Short Block 2000 > Short Block 1999
Short Block 1999
  Short
Block: The short block in SlowGT
is a 1989 5.0 liter block from a truck that was found in a junk yard full
of mud. The block now incorporates parts from Eagle, Childs &
Alberts, Ford Motorsport and Scat. This block is identical to those found in 5.0 liter
Mustangs. The entire assembly was purchased for $50 with no
guarantees. The block is a common 2-bolt variety. It appears
that by far the most important factors to good short block lifetime are
high quality parts, block preparation and good assembly procedures. In essence, making
sure that everything is right, fits right and works
right. Each component of the short block is discussed below.
For more information on building high performance engines, check out the
books
available at the SlowGT store.
   Block:
The block was pressure checked, decked, align-honed
and bored 0.030 over. The main caps are reinforced with an
aluminum girdle from RPM Automachine, Inc. We like this girdle
setup because it retains the main caps with a very strong bracing
arrangement and uses main studs. Installing the girdle requires
that the main caps be machined flat so that the girdle doesn't twist the
block. The caps were machined in place on this block. It is
very important that the block be align honed after the girdle is
mounted. The cam bearings are Clevite part number SH-510S.
The timing chain assembly is a Ford Motorsport part number M-6268-D302.
[ Top of Page ]
  Rods
: The rods are Eagle part number CRS5500F3D
and are 5.5" long and weigh 637 grams each. This length was
chosen to maximize the rod-to-stroke ratio (currently 1.833:1 versus
1.73:1 stock) while still maintaining reasonable piston dimensions
within the stock 5.0 block deck height. The rods, as delivered
from Eagle, were in very good condition, but required resizing on the
big end to make them round to within 0.0001 inches. The rod bolts
are 7/16" units made by ARP. The rod bearings are Clevite
CB-634H. The bearing clearances should be between 0.002 and 0.003
inches and can be measured with Plastiguage if it's done very carefully.
[ Top of Page ]
  Pistons:
The pistons are Ross part number 48195 flat tops.
These pistons are extremely light weighing only 398 grams each. The full floating piston pins are Ross tapered
chrome- moly and weigh 100 grams each. The pins are retained with
double Spiro-Lox at each end of the pin. The piston rings are Childs & Alberts Zero Gap part number
RS-35Zx4.035 and were hand sized to each bore/piston combination.
The pistons were precision cut to allow 0.030" clearance in the
valve reliefs. This is a very tight piston-to-valve clearance and
requires that each piston/valve combination be checked and fitted by
hand. The 4.0 cc valve reliefs, 0.035" piston-to-deck
clearance and Fel Pro 1011-2 head gaskets combine to yield a 12.17:1
compression ratio.
[ Top of Page ]
  Crankshaft:
The crankshaft is a billet steel unit made by
Scat. The 50 lb crankshaft is internally balanced and has gun
drilled rod journals. The crank was delivered from Scat almost
perfectly balanced and has required only minor modifications to be
balanced. In general, internal balancing is better for high RPM
use because of reduced crankshaft harmonic vibrations. This factor
probably contributes to the long lifetime of a stock block in this
application. The stroke is 3.00 inches and the rod and main
journals are stock diameter. The main bearings are Clevite part
number MS-590H. The main bearing clearance should be 0.002 to
0.003 inches and can be measured with Plastiguage if it's done very
carefully.
[ Top of Page ]
 Support
Equipment: The oil pump is a Melling
high volume unit part number M68HV unit that has proven to be very
durable. We don't know whether a high volume unit is necessary but
we suppose it's better to have too much oil volume (too much power loss)
than not enough (too much money loss). The oil pump pickup is
welded to a flange that is then bolted to the oil pump. This was
done to minimize risk of losing oil pressure due to a dropped pickup.
The oil pan is a Canton unit is a work of art and has been specially
modified by Canton to fit this particular car. We usually run a
full 6 quarts of Mobil 1 5W-30 oil. Although there has been talk
of experimenting with some 0W-20 oil, we haven't had the guts yet.
The water pump is a generic stock type pump and the starter is a Ford
Motorsport M-11000-A50. The crankshaft damper is a Ford Motorsport
M-6316-A50.
General Information: The
short block is assembled according to the general guidelines below.
[ Parent Page ]
[ Top of Page ]
 For more detailed
engine-building information, check out the analyses
and books
available at the SlowGT store.
[ Home ] [ Search ] [ News ] [ Race Update ] [ Engine ] [ Drive Train ] [ Chassis ] [ Tech Stuff ] [ Answer Board ] [ Links, Pix & Videos ] [ Contact Us ]
This web site is dedicated to 5.0 Liter Mustang Drag Racing.
The technical information on this site is provided based on the owners personal experience.
No warranty is expressed or implied. Best viewed at 800x600
resolution
or larger with 4.0 browsers or higher.
All rights reserved. ASR Corporation 2000. http://www.slowgt.com
Questions and comments about this site should be directed to the SlowGT
webmaster
Last Updated: May 22, 2001
5.0 liter Mustang drag racing 5.0 liter Mustang drag racing 5.0 liter Mustang drag racing 5.0 liter Mustang drag racing
|
