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Author
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Topic: Split cylinder wall
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Dave and Shellie 364
Journeyman Posts: 9
From: lowestoft,Suffolk,England
Registered: Jul 2001
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posted 07-20-2001 01:31 AM
  
further to an earlier post regarding split cylinder walls,I just done a leak down test on my 351c block as a matter of interest more than anything else and heard a horrible gurgling noise on no3 cylinder.Pulled the head and found a vertical crack about 3" long.Had no sign anything was wrong at the drags in fact had run our best time and only rev to 6000rpm.I have a spare block but I could do with out this.Any ideas what could have been the problem would be appreciated.
David
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SteveLaRiviere
Administrator Posts: 43151
From: Saco, Maine
Registered: May 99
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posted 07-18-2001 05:47 PM
That blows!351C blocks must be hard to come by in England. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC {Wife's car...}
All Fords since 1977
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clevelandstyle
Gearhead Posts: 1035
From: Connersville, IN
Registered: Jul 2001
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posted 07-18-2001 06:30 PM
Cleveland blocks are notorious for having thin cylinder wall. If the block is bored more than .030" , it could crack very easily.
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 07-19-2001 07:03 AM
Dave, sorry to hear, you could pick up an Australian block when you come over! Was your block filled? What was it bored to? What kind of power were you making? Sorry about all the questions but I have a real curiosity about split cylinders, especially when they occur in blocks that are not abused. Core shift maybe??Paul
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Dave and Shellie 364
Journeyman Posts: 9
From: lowestoft,Suffolk,England
Registered: Jul 2001
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posted 07-19-2001 04:38 PM
Hi paul yes were comming over with the view of making it permanent next year.Its middle of our summer and its 15 degrees and raining again.I can only sit in my trailer for so long.The block had been bored 30 over,not filled and we had definatly not done over 6000 rpm.Its on no3 cylinder at about 10 o,clock if you look at the block from the front, vertical about 3" in length.I'm now waiting for a cal1 on an australian block.I suppose we make about 375-400 hp.
David
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kid vishus
Gearhead Posts: 6098
From: middle of NC
Registered: Oct 2000
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posted 07-19-2001 06:59 PM
I have thought for quite awhile that part of my problem at least, is that I run heavy pistons (old TRW pop-ups), heavy rods (stock)
with a touch of rpm (7500). I think the heavy bob weight, coupled with the rpm I turn, side loads the cylinder too much. And then you throw in the fact that the cylinders are extremely thin to start with, and you have a recipe for a crack.
Just my thoughts.
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 07-20-2001 04:16 AM
Kid, you run a short rod length as well (if I remember correctly) That would also increase the side load.
Dave what Australian block are you looking at? (look at another post re: Australian blocks)Paul
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Dave and Shellie 364
Journeyman Posts: 9
From: lowestoft,Suffolk,England
Registered: Jul 2001
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posted 07-20-2001 06:17 PM
Oops! I,ve just read the post about aussie blocks,the way it explains it in the Ford Performance book was that most of the Aussie blocks are thick wall,apparantly not.
I,m going to look at a complete 351c and c4 from a 71 aussie Fairlaine.At least now i've got a bargaing point.I'm also picking up a 71 aussie 302 standard bore as well.Get em while ther hot!.
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jkilroy
Gearhead Posts: 1808
From: Vicksburg, MS
Registered: Dec 99
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posted 07-23-2001 08:50 AM
I can see it now...Flight Agent: "Sir, how many bags will you be checking?" Passenger: "Just these three." UGGGHHHHHHHH!!!! YEEEOOOOOOWWWWWWWWW!!!! (Sound of bag boy throwing out back putting engine block on scale) Flight Agent: "Uh, sir, we may have to charge you extra baggage for this one." ------------------
Jay Kilroy
68' Fastback GT 390
"No such thing as a cam thats too big"
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