llxkevinxll
10+ Year Contributor
- 532
- 269
- Jan 29, 2012
-
Milwaukee,
Wisconsin
Current setup:
-6 Bolt 2.0L
-Eagle Forged Crank
-Manley 9:1 pistons, coated (effective 10:1 with machined head)
-Factory rods, shot peened
-King XP Bearings
-1mm oversize, coated and swirled, stainless SI valves
-Factory turbo cams
-ARP rod and main bolts
-Rewired walbro 255
-NGK BPR9ES Plugs
-FIC 750cc injectors
-TD06SL2 20G
(check car profile for further details, pertinent information above)
This vehicle is/will be used for autocross and road racing primarily, occasional drag passes, and is street driven. My goal is 375 awhp.
The main issue is that the motor suffered bearing failure and the cause, we believe, was the small 16g on a higher compression motor with factory 2g timing. We checked the plugs constantly before pulling the motor and never saw any of the normal signs of abuse. I have attached pictures of the #2 rod bearing halves to this post. The other cylinders looked similar but less sever. They did not spin but the motor had a terrible rattle for 2 years when at part throttle which finally prompted us to pull the pan. My theory is the damage was done with the poor tune and small turbo building boost too quickly (into positive boost while resting your foot against the pedal in the higher gears) and then continued to wear from that point.
The motor compression tested at 210-220 psi per cylinder before being recently rebuilt. I had been running ~15-16 psi on the 20g and had been making at or near my power goal.
So given all of the data above, does anyone feel E85 is required to safely and reliably make 375 awhp on this setup? Did undetected detonation running 93 cause the cylinder pressures to spike so high the bearings were beat up?
thanks for taking the time,
Kevin
-6 Bolt 2.0L
-Eagle Forged Crank
-Manley 9:1 pistons, coated (effective 10:1 with machined head)
-Factory rods, shot peened
-King XP Bearings
-1mm oversize, coated and swirled, stainless SI valves
-Factory turbo cams
-ARP rod and main bolts
-Rewired walbro 255
-NGK BPR9ES Plugs
-FIC 750cc injectors
-TD06SL2 20G
(check car profile for further details, pertinent information above)
This vehicle is/will be used for autocross and road racing primarily, occasional drag passes, and is street driven. My goal is 375 awhp.
The main issue is that the motor suffered bearing failure and the cause, we believe, was the small 16g on a higher compression motor with factory 2g timing. We checked the plugs constantly before pulling the motor and never saw any of the normal signs of abuse. I have attached pictures of the #2 rod bearing halves to this post. The other cylinders looked similar but less sever. They did not spin but the motor had a terrible rattle for 2 years when at part throttle which finally prompted us to pull the pan. My theory is the damage was done with the poor tune and small turbo building boost too quickly (into positive boost while resting your foot against the pedal in the higher gears) and then continued to wear from that point.
The motor compression tested at 210-220 psi per cylinder before being recently rebuilt. I had been running ~15-16 psi on the 20g and had been making at or near my power goal.
So given all of the data above, does anyone feel E85 is required to safely and reliably make 375 awhp on this setup? Did undetected detonation running 93 cause the cylinder pressures to spike so high the bearings were beat up?
thanks for taking the time,
Kevin
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