Almac_Sabre
New Member
Hi Guys,
I've just had the front connecting rod break in my 1UZFE ... well explode is probably a better description! It 'let go' in a fairly major fashion, punching a hole through the side and top (in the 'V' under the TB) of the engine block.
The engine has recently (3000km ago) been totally rebuilt and mildly modified for racing, with heads shaved and ported, and 8 throttle bodies added. It puts out 195kw @ 6000rpm at the wheels.
The guy who built the engine (he's very experienced with 1UZFE engines), and who is now rebuilding the engine, believes that the 'blow up' was caused by oil surge / oil starvation to the rod bearing. He believes that the bearing seized, therefore putting huge stress on the rod, causing it to break.
He suspects that the oil starvation is caused by the modified sump (made very shallow by the previous owner to fit into another car). This shallow sump may not hold enough oil, and we think is susceptible to oil starvation when the oil is pushed forward / back & sideways during heavy braking / acceleration & corning. This is despite a pressurised aqua-sump being fitted.
When we rebuild this engine we want to modify the sump (wings / baffles etc), but unfortunately we can’t go any deeper. The bottom of the sump is currently level with the bottom of the bellhousing.
Does anyone have any ideas / thoughts on the best style of sump to avoid oil starvations? We do not want to dry-sump, so are looking for the best way to modify what we already have. We will continue to use the aqua-sump.
Thanks in advance for your help.
John
PS : Check out http://www.spr.co.nz/raceteam.php for details on the racecar.
I've just had the front connecting rod break in my 1UZFE ... well explode is probably a better description! It 'let go' in a fairly major fashion, punching a hole through the side and top (in the 'V' under the TB) of the engine block.
The engine has recently (3000km ago) been totally rebuilt and mildly modified for racing, with heads shaved and ported, and 8 throttle bodies added. It puts out 195kw @ 6000rpm at the wheels.
The guy who built the engine (he's very experienced with 1UZFE engines), and who is now rebuilding the engine, believes that the 'blow up' was caused by oil surge / oil starvation to the rod bearing. He believes that the bearing seized, therefore putting huge stress on the rod, causing it to break.
He suspects that the oil starvation is caused by the modified sump (made very shallow by the previous owner to fit into another car). This shallow sump may not hold enough oil, and we think is susceptible to oil starvation when the oil is pushed forward / back & sideways during heavy braking / acceleration & corning. This is despite a pressurised aqua-sump being fitted.
When we rebuild this engine we want to modify the sump (wings / baffles etc), but unfortunately we can’t go any deeper. The bottom of the sump is currently level with the bottom of the bellhousing.
Does anyone have any ideas / thoughts on the best style of sump to avoid oil starvations? We do not want to dry-sump, so are looking for the best way to modify what we already have. We will continue to use the aqua-sump.
Thanks in advance for your help.
John
PS : Check out http://www.spr.co.nz/raceteam.php for details on the racecar.