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Author Topic:   Split cylinder wall
Dave and Shellie 364
Journeyman

Posts: 9
From: lowestoft,Suffolk,England
Registered: Jul 2001

posted 07-20-2001 01:31 AM     Click Here to See the Profile for Dave and Shellie 364     Edit/Delete Message   Reply w/Quote
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

posted 07-18-2001 05:47 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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

posted 07-18-2001 06:30 PM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
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

posted 07-19-2001 07:03 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
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

posted 07-19-2001 04:38 PM     Click Here to See the Profile for Dave and Shellie 364     Edit/Delete Message   Reply w/Quote
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

posted 07-19-2001 06:59 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
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

posted 07-20-2001 04:16 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
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

posted 07-20-2001 06:17 PM     Click Here to See the Profile for Dave and Shellie 364     Edit/Delete Message   Reply w/Quote
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

posted 07-23-2001 08:50 AM     Click Here to See the Profile for jkilroy   Click Here to Email jkilroy     Edit/Delete Message   Reply w/Quote
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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