i just have cracked my oil pump.
please lmk if you have any idea.

b18c sleeved 84mm
oem itr oil pump assy new
eagle rods
stock gsr crank
oem bearings


1000miles brake in procedure
than
fully tuned on t3/t04e 27psi

then went to gt35r

tuned on 14psi.
everything was great
first 24psi and get oil pump grear cracked.
no oil pressure at all

 

what crank pulley?
was it line honed?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedcivicsir &raquo;</TD></TR><TR><TD CLASS="quote">what crank pulley??</TD></TR></TABLE>

UNORTHADOX FTMFL... again????

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by supergenius &raquo;</TD></TR><TR><TD CLASS="quote">

UNORTHADOX FTMFL... again????</TD></TR></TABLE>

lol!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedcivicsir &raquo;</TD></TR><TR><TD CLASS="quote">what crank pulley?was it line honed?</TD></TR></TABLE>

 

My oil pump died on me also. I think it was caused by not running a harmonic balancer, according to what i have seen in different threads.

 

yeah harmonics will plague the oil pump and bottom end if severe enough.

 

I've seen 2 oil pumps gears crack. One motor had a UR pulley, the other was ctr N1 solid pulley. Both turbo 300+ whp.

 

Excessive vibrations not being dampen....

 

no damper will do it. a stock damper usually does ok with a single disc clutch. with a twin you need a better damper like ati

 

I also think real light flywheels have something to do with it also. i was running an 8 pound flywheel.

 

flywheels are balanced though right? So how can it be that?

 

Lightweight flywheel and a grabby clutch. Sends lots of vibrations through the motor driving normally. The lighter flywheel has less momentum which is why you have to rev the car higher to take off. Then when the clutch engages and grabs it causes a greater torsional twist on your crank. There is a thread that can explain everything better than i can around here i'll see if i can find it.

 

Note the OP has not chimed in... any bets??? Ill take UR pulley ftw

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by supergenius &raquo;</TD></TR><TR><TD CLASS="quote">Note the OP has not chimed in... any bets??? Ill take UR pulley ftw </TD></TR></TABLE>

x2 think he got his answer pretty quick