0 oil pressure

my 434was running fine but something happened ....it idles great and runs fine but after the oil get warmer..my oil pressure is dropping to 5 lbs .has the oil broken down from heat?help.....need opinions ty

could be a number of things
pump
pickup
bearings
oil is broken down- fuel in oil
did you disconnect the gauge and check it with a pressure gauge?

Change the oil, examine it for metal shavings. replace it with 20/50 or 40 wt. If it's still low you may need an oil pump or a total rebuild. Good luck

What's the pressure at say 1500 rpm's?

I HAVE A BAD FEELING THAT IT'S YOUR CAM BEARINGS! THAT WILL MAKE YOUR OIL PRESSURE DROP. I WOULD CHECK THE SIMPLE THINGS FIRST!

cam and cam bearings..rockers gridd etc are new.......total new roller system....o ringed for nitrous..etc.....i have changed the oil once since installing all new parts/perhaps you r right bro ,i need to do it again.......oil pressure is fine till you get on it......then drops like to 20lbs and keeps going down..this sux/ this motor not old....434 crate ....

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Originally posted by gofastdude
oil pressure is fine till you get on it......then drops like to 20lbs and keeps going down..this sux/ this motor not old....434 crate ....

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First off you say its a crate motor does' it have some warranty on it if its a crate? But when you said its fine "till you get on it" are you saying it only does it when the cars moving and you nail it?

because that would indicate a pickup problem if you are.

BG

yea bro it came from indiania ..we ordered it with all specs I wanted....cut down on compression and o ringed for big cheater nitrous.....yes when you get on it..the pressure drops.....big time....yes has warranty..but we voided it when WE installed new roller cam etc....motor was fine till this crap.just wanted to go faster..stupid stupid stupid..you say pick up?

yup Id say its the pickup for sure,When you get on it the oil that is at pump level will quickley get pumped to the top of the motor and leaves the pump sitting high and dry. Did you have the pickup tack welded to the pump?

IF YOU DON'T HAVE A RACING TYPE PAN ON IT THAT WOULD BE A CRIME FOR SURE! ALSO IF YOU HAVE A HIGH VOLUME OIL PUMP IN IT ,IT WILL ACUALLY SUCK THE PAN DRY OF OIL AT HIGH RPM'S. IF THAT IS THE CASE THAN YOU WILL NEED TO PUT A ACCUMILATOR ON IT! I HAVE SOME KNOWLEDGE OF THIS BECAUSE IT HAS HAPPENED TO ME!

guys everything is professionally done from front to rear to griffin,msd.ded,moroso,hooker,ssracing engine,4 link tubbed..etc.im not sure what happened....or has happened this has got us stumped we pulled the pan checked everything is good........sending unit good......i have noticed a oil spot the size of a dime/nickel on the back middle of the intake after i get on it,i be damned where it is coming from ,not covers..anything..stumped.....this is a stumper for sure......we are not joe blow mechanics ..we know our stuff.....so we thought.haha.we have oil cooler /fans everything..i hate to take it to someone/ you can't trust anyone ..they steal your shit,trade parts etc ive had this happen....world is fu#$ up for sure.

Some questions
1.) What was happening when you noticed it? Right after running 6500 RPMs ? Right after a 4 hour road trip?

2.) How many miles on it since it was installed?

3.) Are there any other issue that started at the same time? Any no matter how small, a hesitation, dead spot or vibration that was not there before.

Just cause a engine was built by pro does not mean a mistake was not made. There are so many things that can go wrong. Most involve mis comunication. Example: Tech thinks he is installing a rod bolt made from a steel that can handle 250,000 PSI but because the wrong part was shipped he is now over torguing a set of bolts that can only handle 150,000 PSI. Just a matter of time till those over tighened nuts come loose.

New engines can equal green castings. Green casting is a term we use when the casting still has stress in it from the casting process. If you machine a green casting they can and will move after. This could effect line bore for either the crank or the cam.


I am not trying to scare you I just want you to go into problem with a open mind. With the info you have given so far anyone of the above post could be right. Check the easy stuff first, Pull the oil filter and cut it inhalf but if you do not maintain 10 PSI of oil pressure per 1000 RPMs don't run it.

Good luck, Hopfully you have a defective oil filter :)

My guess would be the main bearings. Remove the oil filter, cut it open and inspect it for metal. A stroker has got to have less timing in it otherwise it will take out the mains. 32-34 degrees of total timing depending on the fuel and the compression.

ok gorn ..it started happening about a month after we installed the bigger roller system......pro street/ drag..i bee bop it to real close cruise ins..4 88 gear gorn typhoon..off today so will keep you posted......5500 stall never been further than 4 miles one way at a time.....was running 6 18 in eighth on shakedowns....got it to 5 90s now 5 70 s120 mph no spray before this happened....never sprayed.installed cheater system.never used....maybe it got scared lol.kidding.....thanks for the advice a few old pic guys.......have new ones coming......installed another griffin alum radiator and billet water pump/notice the lower rad hose is kinked......had to order.....special fit hose .cheater system aded with nit timing retard system and delay system......was hoping to go 520s been 515s but we will see.a pro stock at the track/we had 80 pro stock at the track 4 running 445s etc and 2 running 5 00s and 2 530s......i told the guy i had a licensed/tagged chevy luv that could run with his 5 35 pro stock....100,000 dollar vehicle he got pissed.lol
http://community.webshots.com/user/daddywabbit

i meant 8 prostocks not 80 geesh.....

more old pics added ,these are old .will add updated pics....truck came a long way.....from 6 80s to 5 70 s to ??? with spray....years of hard work!

ok guys mains and crack in number 7/8 cylinder.........sent truck to paint booth.....motor back to be tore down again,this sux.......im out a boat load.all i can say.......

crack? man that sucks...wish ya luck with it bud.

BG

thanx bro, about to break me.only diff between men and boys is 'price of their toys........i been thinkin about givin it up and selln all ..truck ,trailor,parts etc but i know i cant get my money out of it and then if i decided to get back in take twice the money to build one.i like to start from scratch dont want somebodys turn key..seems cheating to me.hehe.thanks bros for some sound advice.....keep u posted on the outcome......

Dont give up its just a set back we've all had them.

I had quite a few set backs with my car and its still 10 months from complition.

Your probaly be able to salvage quite a few hard parts outa the motor wont ya?

hope so bro...........i cant afford another 17000 plus.......its crazy crazy crazy.........