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Old 09-30-2002, 09:14 AM
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Post thought we had a broken ring, update

i am editing this slightly because of new info i got last night, so it reads more accurately

my neighbor started his 327 i gave him up the day after i got my 350 going. his engine puffed smoke out the odd bank from the git-go. then it stopped after like 100 miles but it blew oil out his pvc valve like crazy. he did a compression check and ALL WERE 170 LBS. shot oil in ALL OF THEM and NONE CHANGED EXCEPT FOR NO.5 WENT UP TO 190 LBS. different heads and valve job but on my old block, which ran great till the day i pulled it out. i didn't have any problems but know i did pull a trace of oil out of my pvc valve but figure that's cause i (as does he) have it in a hole in the back of the valve cover rather than the front.(HE HAS A RUBBER BAFFLE BUILT INTO THE GROMMET) he rebuilt the whole engine but it was never boiled out BUT BORE SIZE WAS CHECKED we figured that because of the new valve job, the bad compression in one cylinder that came up with oil, that he must have broke a ring when he put the piston in, but we pulled it out and it wasn't broken. now what? same pistons, block was honed not bored, ring end gap was never checked. tops of bores were never beveled.

[ October 01, 2002: Message edited by: bullheimer ]</p>

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Old 09-30-2002, 09:55 AM
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Bullheimer, I had the same problem on an old nash six i had rebuilt. I had been careless when i installed the rings and did not have the ring placement gap right. 30/45/90 with the oil ring gap oppsite each other. had to take it all apart. Was a good learning job. Hope this helps some. correct placement cured the problem for me.
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Old 09-30-2002, 10:20 AM
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The oil in the cyl.(wet test) eliminates the valves leaking like you said.(unless you put a $h!tload of oil in ) Was the comp. test done after the hundred miles? If not, what does it read now? When you said the tops of the bores were never beveled, did you mean they had no ridges?
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Old 09-30-2002, 12:35 PM
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no, not much in the way of ridges, i will ask him if he removed them, YES HE REMOVED THE RIDGES compr. OKAY SO THIS IS the update: HE CLAIMS THAT WHEN HE MIC'ED THE BORE THAT IT WAS 20 OVER, NOT 30, AND WHEN I PUSHED THE RINGS TOGETHER AS HARD AS I COULD ON THE PISTON I GOT LIKE 1/16" GAP, SO IF HE STICKS THEM IN THE BORE IT SHOULD GO TO 1/32 BUT WE WILL HAVE TO SEE. ACCORDING TO MY 1955 265 CID. MANUAL 1/32" IS W/IN SPEC FOR BROKEN-N RINGS. I WAS THINKING HE INSTALLED RINGS FOR 20 OVER INSIDE A BORE 30 OVER SO HUGE GAP BUT WILL HAVE TO WAIt TO SHOVE THEM DOWN IN THE BORE TO BE SURE.
I AM PRETTY SURE I HAVE NAILED DOWN THE SOURCE OF THE PROBLEM: HE WASN'T WEARING HIS GLASSES THE WHOLE TIME HE PUT THE MOTOR TOGETHER. JEEZUS, IF YOU NEED GLASSES, WEAR THE G.D. THINGS!
RINGS ENDS ARE FLAT, NO GROOVES OR NOTCHES SO I DON'T SEE HOW IT WOULD MATTER IF THEY WERE UPSIDE DOWN. I NEVER HEARD OF COMPRESSION GOING UP TO 190 ON ONLY ONE PISTON WHILE ALL THE REST STAY PUT W/OIL
[ October 01, 2002: Message edited by: bullheimer ]

okay,i'll be the first to admit this post BLOWS <img src="graemlins/pain.gif" border="0" alt="[pain]" /> i have been reading the other posts on blower sbc with blow by, still can't getta grib on this one, and that is basically the only reason we tore the engine apart, blowing out/using too much oil. we are goin to mic everything out to see if the pistons and rings are correct for the bore size. i'll keep you two posted if and when we finger this out <img src="graemlins/crash.gif" border="0" alt="[crash]" />

[ October 01, 2002: Message edited by: bullheimer ]</p>
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