John Willey 0 Posted March 31, 2016 hey guys, anyone know what sort of power the standard 4.0 sohc au crank can handle. also, did the 168 kW or the XR6 engine have a stronger crank. Share this post Link to post Share on other sites
gerg 10,871 Posted March 31, 2016 Cranks don't so much handle "power" more like RPM. Folks run upwards of 500 hp running boost on a cast crank but they keep it below 6000, keep the timing sensible and get it balanced and seem to live ok. Harmonics kill inline cranks more than anything else. Nope, as far as I know, all bottom ends are equal. XR6 spec got a very mild port with slightly bigger valves, cam and slight bump in compression but no other mechanical differences. 1 wagoon reacted to this Share this post Link to post Share on other sites
Thom 6,641 Posted March 31, 2016 The only difference between au xr6 and standard bottom end is the standard engine uses a half thrust bearing whereas the xr6 uses a whole one 4 Outback Jack, wagoon, XTREME KARTS XF and 1 other reacted to this Share this post Link to post Share on other sites
wagoon 2,429 Posted April 1, 2016 Cranks don't so much handle "power" more like RPM. Folks run upwards of 500 hp running boost on a cast crank but they keep it below 6000, keep the timing sensible and get it balanced and seem to live ok. Harmonics kill inline cranks more than anything else. Nope, as far as I know, all bottom ends are equal. XR6 spec got a very mild port with slightly bigger valves, cam and slight bump in compression but no other mechanical differences. The only difference between au xr6 and standard bottom end is the standard engine uses a half thrust bearing whereas the xr6 uses a whole one Is there much that either of you blokes don't know? Share this post Link to post Share on other sites
gerg 10,871 Posted April 1, 2016 The only difference between au xr6 and standard bottom end is the standard engine uses a half thrust bearing whereas the xr6 uses a whole one I'm guessing that's due to a larger portion of them being manual yeah? Was the clutch beefier too? Share this post Link to post Share on other sites
gerg 10,871 Posted April 1, 2016 Is there much that either of you blokes don't know? I don't fucking know women 11 PRO250, wagoon, dougie77 and 8 others reacted to this Share this post Link to post Share on other sites
dougie77 789 Posted April 1, 2016 No one knows that Cortina for life 7 Mixalis, PRO250, Ando81 and 4 others reacted to this Share this post Link to post Share on other sites
Thom 6,641 Posted April 1, 2016 Cranks don't so much handle "power" more like RPM. Folks run upwards of 500 hp running boost on a cast crank but they keep it below 6000, keep the timing sensible and get it balanced and seem to live ok. Harmonics kill inline cranks more than anything else. Nope, as far as I know, all bottom ends are equal. XR6 spec got a very mild port with slightly bigger valves, cam and slight bump in compression but no other mechanical differences. The only difference between au xr6 and standard bottom end is the standard engine uses a half thrust bearing whereas the xr6 uses a whole one Is there much that either of you blokes don't know? I only know how little I know 3 wagoon, ando76 and Outback Jack reacted to this Share this post Link to post Share on other sites
gerg 10,871 Posted April 1, 2016 No one knows that Cortina for life Not even women 5 ando76, dougie77, PRO250 and 2 others reacted to this Share this post Link to post Share on other sites
winton 399 Posted April 2, 2016 2 dougie77 and gerg reacted to this Share this post Link to post Share on other sites
Stevemack 122 Posted April 5, 2016 I run the hybrid engine between EL and AU and i had mine fully balanced, it was dynoes at 220KW at the wheels and i regularly spin it to 7k for long periods. Hasnt broken yet. 2 gerg and Thom reacted to this Share this post Link to post Share on other sites
John Willey 0 Posted April 6, 2016 wow, sounds like a fairly strong engine Share this post Link to post Share on other sites
Stevemack 122 Posted April 8, 2016 Yeah it is, the only non off the shelf ford parts are the pistons and the ecu, other than that its all ford. The first engine split the block in two straight down the middle when number three let go at 7500rpm! This one still has a standard head too, no port work or bigger valves. Big cam though. Share this post Link to post Share on other sites