Cylinder leak down test - need input - Page 5 - El Camino Central Forum : Chevrolet El Camino Forums
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  #61  
Old 04-19-2017, 11:47 AM
anix anix is offline
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Depending on my real job, I may have this thing on the engine stand before the weekend is over. If nothing major is broke or worn out I will probably send the block, heads and crank to the machine shop. I want to run pump gas but I also want to rattle the widows when its idling. Its a 030 over 402 now (think I will go 060 if it will clear), has 2292 casting heads (which I have read are open chamber 112cc). I have a new set of crane roller rockers, 750 vac secondary carb, new edelbrock duel plane air gap intake and an MSD street fire dizzy. I am open for suggestions on the rest. Not really a lot left. would like to stay 9.5 to 10.5 range and thinking about a roller cam. Also been reading some good things about beehive valve springs. Would love to hear form any one using them.
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  #62  
Old 04-19-2017, 03:21 PM
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i guess the rings could be upside-down??
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  #63  
Old 04-19-2017, 03:27 PM
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I almost want to say retork the heads.
radiator pump cost about 140 I picked mine up at pawn shop i offered 30.
you checked your trans modulator check .
I wouldve backed out too.
A big mistake even pros make is torking down heads .
a place where i worked you had to have two mechanics ,
one torking one marking bolts and keep in sequence. three times.
With those pop ups ,aluminum heads probably needed better head gaskets
like a super charger .
You will probably see where it was leaking when you pull the heads.
at the least wire ring gaskets maybe copper.
pull the side that was smoking first youl breath easier when you see carbon trail.
just a load of bad or cheap gas on a cold day might make it spit out head gaskets.
Things got a lot of compression.
your leakdown test was 4-6 percent .
means your valve seats and rings are good 5 percent even within factory spec.
Sure that carborator is sound headgasket leak would have dropped compression
more.
Ive seen plugged air cleaners suck oil to carb and put it back in cylinders,
made them smoke oil smoke.
bet its the carborator
process of elimination.
id do that compression test one more time.
if its the same ,all thats left is the carborator.
if its less its your headgasket.
I think you got this.
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  #64  
Old 04-19-2017, 03:49 PM
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You also just tested bottom and top end ring gap and all.
no knocks or seizing good deal.
if compression test the same your good.
something stupid going on in carb.
float sank or fell off.
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  #65  
Old 04-19-2017, 03:53 PM
bowtietruck bowtietruck is offline
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if rings were upside down it wouldnt have 195 psi.
smoke is coming from exaust right?
if a ring were upside down it would make oil stick have psi surging
and oilstick probably popping up

Last edited by bowtietruck; 04-19-2017 at 04:02 PM. Reason: extra
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  #66  
Old 04-19-2017, 04:16 PM
bowtietruck bowtietruck is offline
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Its normal to have to add breathers for block pressure with pop ups
and blowers .
crankcase pressures go up ring blowby is normal as long as you have compression.
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  #67  
Old 04-19-2017, 04:45 PM
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Roundy round racer(I bought premium berrings this time) after seize up
pumped street racer (I bought steel ring gaskets this time)
pro racer (did triple valve seats and machined steel rings into block)
Im the middle guy.LOL
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  #68  
Old 04-20-2017, 06:23 AM
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Alonza, still cant understand exactly what iit is your trying to say about 97.8% of the time,
the rest of the time i'm still not sure??

there is more than one kind of piston rings, different types/styles..
some rings upside down can acctually improve compression, and reduce blowby
and make the oil control worse [smoke from the tail pipe]..
thats what i read anyway,
i have never had the pleasure of diagnosing and fixing a motor with that problem..
.
.
Al got any pics of the PCV oil baffle??

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  #69  
Old 04-20-2017, 07:00 AM
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If you do another test make sure you have the carb locked at WOT.
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  #70  
Old 04-20-2017, 10:42 AM
bowtietruck bowtietruck is offline
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The guy who built it is not totaly stupid.
Why dont you pick up the phone and call him.
bet he knows about mark showing which way is up.
Sorry if i run you in circles.
Wouldnt suprize me if that was a balanced and blue printed block.
somebody put a lot of thought into.
and with your little fiber optic you should be able to see bevel on ring.
If their upside down.
Rings are not that broken in.
After you do that.
do a compression test.
only because it started smoking more.
once you have done that,if its the same.
All thats left is the carborator.
Flat spot on cam you would have bad mis.
valves and rings passed first time around.
Upside down ring would show bevel.
you should be able to tie a wire to that fiber optic to look at rings
but you probably wont be able to see at top dead center.
run the cylinders down a little.
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  #71  
Old 04-20-2017, 12:48 PM
bowtietruck bowtietruck is offline
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also if the rings are black they might be the oil rings on top
instead of compression rings
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  #72  
Old 04-20-2017, 04:45 PM
anix anix is offline
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Waiting for someone to come by and help me set the hood off. Everything else is loose. Its coming out.
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  #73  
Old 04-20-2017, 05:12 PM
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oil rings will not fit in the top two grooves. bevel on either of the top two rings will be down in the groove of the piston not out where you could see it. The bevel (if any) is there to help the pressure push the ring against the cylinder wall.
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Another 3 to 9 years should finish it.
In year 10. Added FITech Fuel Injection this year. 40K miles and going strong.
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  #74  
Old 04-21-2017, 10:07 PM
bowtietruck bowtietruck is offline
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correct .
might be lined up ring gaps.
rookie move.
Was hoping for new carb out of adjustment.
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  #75  
Old 04-22-2017, 02:41 AM
bowtietruck bowtietruck is offline
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Looked up eldorbrock owners manual.
theory of opperation
and trouble shooting
it can come with debre in it
and out of adjustment for certain motors
if it is rich
black smoke low power
think ive seen that before , it looked kinda gray with black in it.
google it
might have to tap on it with rubber mallot,
adjust air fuel turn them tell they bog backem off 3/4 a turn
three settings on metering rods.
careful I stripped a screw holding metering rods in.
I still dont think its the bottom end.
but im actualy a side kick engine builder.
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