bad cam
 

i have a 454 and all my lifters stuck,so i put new ones in and ran one race and there already weak.when you ajust them the motor bogs down before the rockers stop rattling but.any ideas?thanks

Stuck?? what do you mean by stuck? :shock: siezed up ?? the engine should bog down a little when you adjust your hydrolic cam and its a little to far out of adjustment .. I assume hydrolic since you stated till the rockers stop rattling... any more info ?? solid cam ? roller ? cam lobes wiped out ?

seized yes springs inside froze and quit oiling kindof like if the were solids,and new ones work good but now are starting to do it too the motor starts popping not loud popping like times too high and laboring almost dieing.can't set past .004 with feeler gauge hydrolic cam 490 like stock cam all stock lobes rockers and springs look good .maybe cams qround wrong :?: can't figure it out.help any?thanks

Do you have roller rockers?They will always make a little rattling noise.Are you pushrods okay?Best way to set valves is with engine warm but not running.Get the valve your adjusting completely closed to the head,then tighten the nut untilyou just barely get rid of all your slack.Then put 1-1.5 turns of preload on it and walk away.

no rollors,push rods are good.that' how i usually ajust by bumping up the valves but it wont run.u can't even go a 1/4 a turn if u do it one at a time or the motor starts to die.tried it hot cold running not running .what could it be??thanks

Did you put the cam in yourself?Is it a possibility that you got the timing set out of time,like one tooth off.I did that once,it sucked.I learned to slow down :D

that makes sense,definety will check it.thanks

Can't think of anything else off the top of my head. Let us know what you find

I thnik 1 1/2 turns is to much on the lifter adjustment. 1/2 to 3/4 turn should be plenty to put plunger in center of lifter.

yes but,i can't even turn them a 1/4 it won't run if i go 1/2 usually would set on tight 1/4

Maybe your pushrod bearings are bad????? :shock: :lol: :lol:

no there good.that wouldn't make it do this,plus it would knock.any more ideas?

was your lifter bores trued before engine was assembled ?

man the limited amount of turn on adjusting almost sounds like the
wrong lifters or bores checked for ware, yea, would like to know
the findings, valve train, interesting

i pulled out cam and lifters and 9 of the new lifters were froze like the old ones.all the new lifters worked good at first.it was in time the cam lobes were all good but about five were alittle bigger or smaller.i'm talking like a couple sheets of paper may supposed to be??i don't know!!

Is it oiling good? Seems like the lifters getting stuck and wearing out real quick could be caused by lack of oil then Heat. Just an idea..

the first set didn't oil the second set did at first and started quitting 2

Not to sound like a a-hole by no means..
but my suggestion it take the bulltet out and have someone look at it that knows what they are doing..

no offense toward you by no means

not to sound like a a-hole either but i run a garage and build race cars and it a distributer.but it's not bad all the time i checked it yesterday and it was firing good now its not.and the cam had a couple of lobes that were grond wrong.but still pops putting in new dist.will post results.thanks eveybody

:idea:

How's the muffler bearing?

i don't know what your problem is?i didn't ask for smart remarks.and to recall[no offence to bjuice] every mechanic here has looked at my car. and i found it was a wiring problem,dist. and a bad cam.thanks every one

you know i don't think anybody on here has given you smart remarks . and i don't think any mechanic on here has looked at your car. everybody has tried to give you advice based on your discription of the problem. brian gave you a logical suggestion to your unique problem without trying to be rude.your reply was a little defencive "not to sound like an a--hole i run a garage and build race cars". relax big guy . it's hard to diagnois a problem like this with out being there with hands on. you should know how it is running a garage and building race care in all. i can't figure out how a wireing problem, a bad distributor, and a bad ground cam could seize up 9 + lifters twice? who's cam and lifters are they? there tech dept. should probably know about your problem with there product. no offence towards you.

I think he was talking about this.

JMO

I JUST REPLACED THE MUFFLER BEARING ON MY DUAL EXHAUST :shock: :shock: ---IT RUNS ALOT SMOOTHER NOW :? :? AND LATER I AM PAINTING MY EXHAUST WITH TEFLON PAINT INSIDE AND OUT--IT WILL PROBABLY GAIN ATLEAST 60 HORSES :? :? :? ---IS THAT A SMART REMARK OR JUST HAVING FUN???-----GROW UP AND RELIZE JUST BECAUSE YOU ARE A MECHANIC AND BUILD RACE CARS DOES NOT MEAN YOU DO NOT MAKE MISTAKES OR YOU CAN'T LEARN ANYTHING NEW!!!!!!!!--------LIVELY[ I HAVE BUILT FOR OVER 35 YEARS AND STILL LEARNING] :roll: :roll: :roll: :roll:

tod74 yes that's what i was talking about,thanks.and i ment mechs.in this area.and i did not mean any offence to anyone was just trying to figure out my problem.and i thank every one who helped me.and how a dist. and cam seizes lifters and kills plugs i don't know but it did.thanks

Joking aside...How ya coming along on your Ranchero?

lively,i neversaid i knew everything.that's why i'm asking advice.i'm only in my 20's so i have a lot to learn.and i didn't realize you were joking.

bad cam
 

The block doesn*t have oil restrictors in it does it? Do they even use them in big blocks? somebody straighten me out!

no oil restictors,atleast not in my motor.i think maybe just got a bad set of lifters.these are doing good so far but i haven't raced with them yet.

It's funny, nobody seemed to catch the one about pushrod bearings! When's the last time anyone changed a set of those? :lol:

I think we need to lighten up a little, don't you? If you can't have some fun on here then what's the point? Especially when the symptoms and problem descriptions don't go hand in hand.

Oh,yeah.Get me invovled,why don't ya :roll: :lol: :lol:

I caught it... :D I try to have fun but I got warned for being a wise guy so I toned it down. But I was warned because it was the scammer forum I made a couple wise cracks in and a mod thought maybe those who were scammed would not appreciate it...and He was probably right so I deleted them. Didn't mean to cause problems.

Yeah,I've had people jump my case for being a smart a$$,too.Just ignore it,bud.HAVE FUN

:lol: :lol: :lol: :lol: :lol: :lol: :lol:

I didn't say who said it, but since your telling on yourself :wink: :lol:

sorry guys,my car has just got me on edge.

Yeah,I'm bad about ratting myself out.Oh,well :D

No worries, sounds like you could have multiple issues from your most recent description. Really shouldn't be that difficult to correct, it's just difficult to give advice about how to repair thses kinds of issues, especially if there are some real mechanical issues that need correcting before you can move on to the next problem.

I can tell you that the distributor will absolutely not cause the lifters to seize. Not sure what modifications you've made other than cam. But if you put a performance cam with any decent amount of lift in your BBC, do not run the stock valve spring or you will flatten the cam lobes. Be sure the top end is oiling properly. What type of cam, lifters, and Valve springs did you use?

Bill

Re: bad cam
 

If that thing is a hydraulic cam just preload the lifters with the engine off. Some may disagree but oh well.... I always did it that way and no problems. Just tighten the nut while spinning/ wiggling the pushrod between your fingers until the lash is gone then go a half turn. You will get many different opinions on how far to go...some say quarter..some say half turn...some 3/4 etc. I have even seen a book that said 1 full turn.( too much I think) You just need to center the plunger in the lifter.

No way would I put up with the mess of oil spraying everywhere trying to run the valves with the valve cover off.

JMO... take it for what it's worth.

ditto
 

ditto what Tod74 said. i've had good luck doing exactly as he says. even with it idling its not too bad but gets messy if revved up..