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 Post subject: Blocks cracking
PostPosted: Tue Apr 20, 2010 12:30 am 
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Teamswift Racer
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Joined: Tue Jan 29, 2002 7:41 pm
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Location: Armstrong British Columbia
Any of you swift peeps been playing with large overbores lately?
I've been playing with a large bore G16 engine. And well can't find a block that isn't cracked to start or cracks before it gets assembled.
What kinda g16 blocks are you guys running?
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 Post subject: Re: Blocks cracking
PostPosted: Tue Apr 20, 2010 11:50 am 
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Joined: Sat Apr 24, 2004 9:48 am
Posts: 725
Location: Winnipeg
I've had one do that, but i didn't think it was very common...it was only at 75.5 mm bore, but with boost.
I guess i should gather some more blocks if that's going to be a problem.

Was your application boosted?


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 Post subject: Re: Blocks cracking
PostPosted: Tue Apr 20, 2010 11:52 am 
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Joined: Sat Apr 24, 2004 9:48 am
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Location: Winnipeg
Where did your cracks show first? Mine was on the deck between the cylinders.


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 Post subject: Re: Blocks cracking
PostPosted: Tue Apr 20, 2010 2:46 pm 
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Location: Armstrong British Columbia
2 blocks i bought came with cracks. one block cracked while it was getting bored out. THe other ( picture) cracked after the block cooled and the new liners were installed. ( we pushed the liners back out and this was the result.

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 Post subject: Re: Blocks cracking
PostPosted: Wed Apr 21, 2010 2:37 pm 
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Location: Winnipeg
Murr, What's the OD of the sleeve you're trying to use?


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 Post subject: Re: Blocks cracking
PostPosted: Wed Apr 21, 2010 5:27 pm 
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Location: Saint-Jérôme, Qc
I've seen a few stock engines crack like that, I thought it was in the mains area only. Your block looks like it can be separated in 2 pieces :shock:

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 Post subject: Re: Blocks cracking
PostPosted: Wed Apr 21, 2010 7:04 pm 
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Joined: Sat Oct 11, 2003 10:29 pm
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Location: Sherbrooke, Québec
Just to be sure you know, you asked questions about my setup but mine is a 1.3l with block guards and new sleeves.bore is at 78.5mm.

I am amazed to see your block cracked like that.Never seen one do that neither on a 1.3l or 1.6l.

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 Post subject: Re: Blocks cracking
PostPosted: Thu Apr 22, 2010 3:42 pm 
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The sleeves are a dry sleeve at about 81mm od. Some of the blocks cracked from the bottom up, others top down. I machined up this girdle to help keep things together and it was of no help. The blocks have very high level of silicon in them and when machining them the metal chips aren't chips but dust.
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 Post subject: Re: Blocks cracking
PostPosted: Thu Apr 22, 2010 10:26 pm 
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Location: So. Calif
Why would the block has high silicon when it's got liners? The pistons don't ride on the bare aluminum so why the silicon?

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 Post subject: Re: Blocks cracking
PostPosted: Mon Apr 26, 2010 1:14 am 
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Probably flows / pours better when they make the block. I'm really not sure but its a brittle casting and machines more like cast iron then aluminum.

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