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 price.
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 http://www.atomicperformanceproducts.com/conrods.html
Cobra Engine Build Part 1
This will be the first in a series on the engine build for my Cobra. This is a 351W bored 0.030" with a 408 stroker crank. The intake was converted to fuel injection and featured in a previous video. I will list components as much as I can.
Street Fords DVD - Barra Strip Down
From 2007, host Racin' Jason strips down a Ford Barra (XR6) engine, then catches up with Brad from Atomic Performance Products about their aftermarket parts.
Eagle I Beam and H Beam Connecting Rods
Her we are showing you the features of the Eagle SIR I beam 5140 forged connecting rods vs the 4340 forged steel 3-D H beam connecting rods. Eagle I beam connecting rods for Chevy, Ford and Chrysler, rated to 500 horsepower on small blocks, and 700 horsepower on big block applications. H beam connecting rods are offered for most any applications, Chevy, Ford, Chrysler, Oldsmobile, Pontiac. horsepower ratings are anywhere from 750 to 1400 horsepower. Import connecting rods, Honda, toyota, Nissan are good for 900 horsepower. All eagle rods come standard with ARP rod bolts. Call CNC-Motorsports for all your performance needs. We stock most all lengths.
visit our web site www.cnc-motorsports.com
Atomic Performance Products - XR6T on-car Valve Spring Tool
On-car Valve Spring Removal Tool to suit Ford 6 Cylinder DOHC
Our Patented (Patent # 2006100221) tool is a simple device to facilitate quick and easy removal of valvetrain components in Ford 4.0L VCT twin cam Barra engines. The unique features of the tool are as follows:
• The cylinder head does not need to be removed to gain access to the valve springs
• Once the tool is fitted, all 4 valve springs per cylinder can be changed concurrently
• No special skills are required to use the tool
• The possibility of collets falling into the engine is greatly reduced
The tool saves many hours of labour when changing one or many valve springs, valve stem seals or retainers - a mechanic can change all 24 springs in about 3 hours. Changing valve springs is very common due to the varying tensions of standard springs and their rapid deterioration in service, which in turn caused erratic idling and drivability issues. They are also regularly changed in Ford turbo vehicles as higher Boost can bring about premature valve float.
To use the tool, simply remove the camshafts, fit the tool to number #1 cylinder and the 4 springs can be changed in about 10 minutes. Refit the tool to the next cylinder in sequence and continue until all are changed, refit the cams and the job is done!
For more info, visit:
Connecting Rod Balancing
See how connecting rods are balanced by John Edwards @ Costa Mesa R&D, www.engine-machining.com 949-631-6376
Atomic Performance Products - XR6T High Performance Valve Springs
Atomic Performance Products have available a range of heavy duty valvetrain weapons for the Ford SOHC and DOHC 6 cylinder engines. Our range includes H/Duty and Race Springs, chrome moly retainers, machined chrome moly valve locks, stainless steel valves and anti pump-up lifters.
Standard valve springs suffer from varying seat pressures from new and once subjected to cyclic operation (even for a short time) can lose tension rapidly. This loss of tension can lead to "valve float", a condition whereby the valve is not returned cleanly to the valve seat, allowing it to bounce off the seat and releasing vital cylinder pressure. The resultant loss of pressure creates a misfire, followed by either erratic idling and/or stalling.
All valve springs lose tension after being installed - and because the original Ford valve springs are quite weak, even a small loss of tension can bring about this condition. turboBoost pressure also works against valve spring tension on the inlet valves - the DOHC Ford 6 cyl inlet valve has an area of 3.5 sq inches approx, so for every pound of Boost, roughly 3.5 lbs of valve spring tension is deducted from the spring pressure. For example, if the spring has 50lbs of seat pressure and the engine has 7 pounds of Boost, the net effect is that valve spring tension is reduced by 24.5 lbs to only 25.5 lbs of seat pressure, which is inadequate for almost all applications.
Atomic H/D or Race springs are definitely not repackaged Ford V8 or Typhoon/Tornado springs (which fatigue just as quickly as the originals) but are custom wound from premium quality USA made nickel chrome vanadium spring steel, heat treated, shot peened, scragged and packed in matching sets of either 12 or 24 for use in all 4.0L SOHC and DOHC 6 cyl engines. Suitable for use with either standard or Atomic camshafts, no expensive cylinder head machining is required and the standard valve spring retainers, seals and locks are retained.
Changing valve springs on the Ford DOHC engine has become quite a bit easier with the release of the Atomic on-car valve spring removal tool - part #100704. Rather than having to remove the cylinder head to gain access to the valve springs or using levers and collars to change the springs on the car, our patented tool allows all 4 springs per cylinder to be changed simultaneously - the entire job can be undertaken in only a matter of hours. No special skills are required and the possibility of dropping a valve collet into the engine is substantially reduced. Please refer to our Tools and Tricky bits section for further information.
For more information, visit http://atomicperformanceproducts.com/valve_springs.html
LS3 Piston Pin Clip Removal
This is how you remove the piston pin clip from the LS series piston. Now you know! www.engine-machining.com (949) 631-6376
BMW Connecting Rod Modifications
John Edwards discusses how he machines BMW connecting rods to reduce weight for increased RPM for naturally aspirated and forced induction engines.