Although we have been building high performance engines since 1978, it wasn’t until 2004 that we began development work on the Ford 4.0L DOHC 6-cylinder turbocharged engine. We witnessed numerous catastrophic engine failures after consumers had undertaken simple modifications such as free flowing exhausts and cold air intake systems to otherwise stock vehicles, so it became apparent there was a need for us to engineer some hard core solutions to address inherent factory weaknesses.
The crankshafts in high performance Ford 6 cylinder engines operate in a quite hostile environment. With a long stroke of almost 4” (99.31mm) spread out over 7 main bearing journals spread out over a length of 650mm, cranks are subjected to enormous torsional moments, which is understandable when considering combustion (compressive) forces of a typical 800HP engine operating at 7500 RPM are in the order of 7-8 tons of pressure per cylinder, occurring 62 times per second. And we are making around double this power level already!
Over the last 20 years we have refined the heat treatment methodologies of nodular iron cranks to provide a considerable increase in fatigue resistance, making them a reliable and cost effective crankshaft for moderate performance applications.
And for the all-out race engines, our billet steel cranks are just the ticket.
Available in stock stroke or destroked to 86mm (to provide a desirable 1.75:1 L/R ratio), fully aero-counterweighted, straight shot conrod oiling, triple heat treated, shot peened and balanced, Atomic billet crankshafts represent the pinnacle of crank design for the Barra.
#306170 – Stage 1 prepped Nodular iron crank – no exchange:
Stage 1 crankshaft suit Ford 6 cyl. Crank tested, ground/micropolished journals, chamfered oil holes and balanced. No exchange required.
#306170-RB – Stage 1 prepped Nodular iron crank – exchange required:
Stage 1 crankshaft suit Ford 6 cyl. Crank tested, ground/micropolished journals, chamfered oil holes and balanced. Customers unit.
#306171 – Stage 2 prepped Nodular iron crank:
Stage 2 crankshaft suit Ford 6 cyl. Crank tested, stress relieved, tempered, reground/micropolished journals, chamfered oil holes and balanced. No exchange required.
#306171-RB – Stage 2 prepped Nodular iron crank:
Stage 2 crankshaft suit Ford 6 cyl. Crank tested, stress relieved, tempered, reground/micropolished journals, chamfered oil holes and balanced. Customers unit.
#306174-SS – Billet steel crankshaft – Barra DOHC 6 cyl engine:
Billet crankshaft suit Ford DOHC 6 cyl. Std stroke (99.3mm), standard crankpin diameter and width. Fully centre counterweighted and aero-profiled, straight-shot oiling, standard OE style 6 bolt offset crank flange PCD, triple heat treatment and balanced.
#306174-DS – Billet steel crankshaft – Barra DOHC 6 cyl engine;
Destroker billet crankshaft suit Ford DOHC 6 cyl. 86.0mm stroke, standard crankpin diameter and width. Fully centre counterweighted and aero-profiled, straight-shot oiling, standard OE style 6 bolt offset crank flange PCD, triple heat treatment and balanced.
