Blueprint 103 - Connecting Rods
Connecting rods are the crux of the engine. They're responsible for
carrying the force of the explosions that occur in the combustion chamber
and using it to turn the crankshaft. Oil clearance specifications of the
"big end" and "small end" are crucial to maintaining consistent oil
In this video we take 3 measurements:
Rod Journal (also called Crank Pin) Diameters
"Big End" Bore diameter
Using the Journal diameters and the "Big End" Bores, you can calculate your
oil clearances of each bearing. The process is illustrated here. Anyone
rebuilding an engine who doesn't know its history should check all of these
clearances whether or not they're re-using the rods. If the crank,
bearings or connecting rods are going to be replaced, it's imperative that
you measure the new parts as well to ensure they're in spec.
Atomic Performance Products - XR6T High Performance Conrods
Atomic billet steel conrods were designed from scratch with one principle
in mind; use aerospace quality materials and sophisticated manufacturing
processes to produce an extremely strong, light and durable connecting rod
for the popular inline 6 cylinder Ford SOHC/DOHC engines, at an affordable
The Design and Evaluation Process
The Atomic engineering team set out to address these parameters by
designing what many performance engine builders are now calling the finest
conrod on the market for the Ford DOHC 6 cylinder engine.
Extensive CAD/CAM computer modelling was employed and produced a H-Beam
design, which has an extremely high stiffness-to-mass ratio. The next step
was to pick the correct materials, heat treatment and surface treatment
processes to ensure durability under rigorous performance applications.
Next came FEA modelling (Finite element analysis) to simulate stresses on
the conrods. This also entailed weighing every piston, gudgeon pin and ring
set on the market and loading this information, plus stroke, rotating and
reciprocating conrod values into our computer modelling software to
calculate the stresses.
The greatest load exerted on a conrod in an engine producing 600 comes not
from the force of normal combustion but from the tensile force exerted by
the piston at top dead centre (TDC). At 5250 RPM the piston exerts a
tensile load on the conrod of 1908 gs (-1693 kgs) at split overlap TDC
reversal. If you increase maximum engine speed by only 1000 RPM to 6250
RPM, the TDC tensile load rises by 50.4% to 2870 gs. At 7500 RPM the
tensile loading increases to 4132 gs, clearly demonstrating the Atomics
design strength of 8000 gs means it has plenty in reserve.
Excessive loads at TDC are brought about by a high reciprocating mass
and/or by increasing engine RPM, so it is essential to design reciprocating
engine components with the lowest mass possible to minimize premature lower
bearing shell bearing failure. This is particularly relevant to our
customers who are turning their engines to 7500RPM+.
For more information, visit
how to resize, close and hone v8 conrods
A quick guide on how to recondition conrods,removing and replacing conrod
bolts,using ARP 220000 psi rod bolts,closing and honing bigend tunnels to
Land Rover engine rebuild stuff you must know - CON ROD
There are more things to check with a feeler gauge than just valve
clearances on you Land Rover four cylinder engine. In this video we share
with you how to measure of couple of things on the 300tdi Land Rover engine
when undertaking repairs or overhauling an engine. Checks you should carry
out when removing the con rod from the crank.
We look at crankshaft end float and the need to check for distortion in
the con rod big end.
Connecting Rods Machine Shop Video-Engine Building DVD
Buy the "Basic Engine Building" DVD
Basic Engine Building DVD - Chapter 27: Connecting Rods
By now the connecting rods are ready for pistons. We recommend having the
machine shop clean your old pistons for you, if you plan to reuse them.
It's not fun at all by hand. Here we show you how they install the rod pins
into the connecting rods to connect with the pistons. Then they will
measure the pistons to determine the final bore size of the cylinder walls
before they are honed.
BoxWrench.net is a community and resource designed for automotive
enthusiasts. The Basic Engine Building DVD is over three hours of engine
building that covers everything from removal and disassembly to final
assembly and engine start-up. This is the ultimate DVD for any home
mechanic or engine enthusiast that wants to see a complete rebuild from
Teardown to Start-Up. This video can be used to learn how to work on almost
any type of internal combustion engine including V8, V6, Straight 8,
in-line 6 and even 4 cylinder engines. All of the interactive features and
menus will not work over YouTube.
This video is great for people interested in car repair, car care, and
restoration. As well as hot rods, muscle cars, performance parts, and Boosting horsepower. It can also help
you to gain knowledge for increasing fuel economy, how to lower your
emissions, and covers preventative maintenance to avoid little things like
Get the full DVD with all of the interactive menus, Tools section and
engine Glossary terms here...
Don't forget our Holley Installation & Tuning DVD. Sample clips on our
youtube page and at our store here...
New Transmission DVDs and a Differential Rebuilding DVD just added.
Educating the Automotive Enthusiast
BoxWrench on Facebook:
How to: Assemble Pistons with Rods
In this quick video I show you how to put together your piston and rod
assembly and get it ready for installation onto the crankshaft.
Here are the current specs for my KA build for those who are interested:
- .020" overbore
- Wiseco .020" over forged pistons
- Eagle H-beam rods
- Stock Crank
- No line boring or honing
- Clevite Main Bearings (In my other video, I showed you how to choose the
proper bearings for your KA. I'm going with the Clevite "standard" bearings
really for experimentation purposes, to see how they hold up.)
Also, check out the Facebook GROUP:
And the Facebook PAGE if you are interested:
VW Drag Racing Piston Lightening
Follow along as John Edwards @ Costa Mesa R&D lightens a set of forged
pistons for Robert Kong's hot Karmen-Ghia drag machine.
WORLD Racing Presents: Descendant Engine Build
In this video Engine Builder, Gary Kubo and Team Manager, Rob Cardona
explain some of the dynamics that go in to assembling one of our WORLD
Racing engines while giving you some insight on why we choose to use the
high quality components we do and how these components contribute to our
success in racing.
WORLD Racing offers various packages for the 2AZ-FE and 2AR-FE engines
found in late model Scion tC's and xB's.
Built, Balanced & Blue Printed by WORLD Racing
JE 253055 Pistons w/ Heavy Duty .210" Wall Wristpin
BC BC625+ Connecting Rods w/ARP 625+ Custom Age Fasteners (4340E
Descendant Main Studs
Descendant 3/8 inch Head Studs (1/2 inch available by request)
OEM Oil Pump - Blueprinted
OEM Water Pump
New Bearings: Race Specific Rod Bearings, Seals, Chains, & Gaskets
BC 0341T turbo Cams - Stage II
BC 1340 Heavy Duty Valve Springs
BC 2340 Titanium Retainers
BC 3344 35.0mm Intake Valves (+1mm)
BC 3345 30.5mm Exhaust Valves(+1mm)
Descendant Intake Manifold by Golden Eagle Manufacturing
Race Cylinder Head by Port Flow:
Includes disassembly and cleaning of cylinder head plus inspection prior to
port & polishing, multi-angle valve job, de-shroud valve area in chamber,
polish of chambers, surface deck, assembly of cylinder head and finally we
check cam lash.
These engines are designed to produce up to 1,100HP depending on fuel,
climate, engine management and turbo
sizing. Please call one of our professionals for more specific details and
WORLD Racing Inc.
WORLD Motorsports West
2170 W. 190th Street
Torrance, CA 90504
WORLD Racing uses the highest quality components available on the market
BC (Brian Crower)
Golden Eagle Manufacturing
Port Flow Design - Competition Cylinder Heads
Connecting Rod Narrowing
One of John's cleints sent a set of Chevrolet connecting rods to Costa Mesa
R&D Automotive Machine to be narrowed, watch how its done R&D style!
www.engine-machining.com (949) 631-6376
94 S10 4.3L Rod Bearing Replacement
See Bearing Removal Here... http://www.youtube.com/watch?v=nYDei1VgzVw
See Engine Clean Up Here ...http://www.youtube.com/watch?v=jvP18zt0q2Y