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  #46 (permalink)  
Old 09-27-2010, 03:17 PM
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Hey OP, Got details?

Quote:
Originally Posted by CNC BLOCKS NE
So your not addressing the main line first if not that sounds scary, Does you machinest have a sqaring fixture he using or is he using the fudge factor!!!
Kansas Instruments fixtures in both shops we use. I think the OP is probably learning answers to some un-asked questions by listening to this sideline conversation. Therefore it all ends up being good stuff.

Although .............I feel like maybe he has a "What's Next" question coming up. HELLOW C3

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  #47 (permalink)  
Old 09-27-2010, 03:21 PM
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It was about quench C3

Quote:
Originally Posted by cobalt327
The engines that I build and have built in the past are not to the point that there's zero tolerance for error. Quench is targeted at 0.045", worst case scenario is that it's a little tighter than that.
Quench is suppose to be .044. What the heck are you thinking? Now I'm really upset.
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Old 09-27-2010, 04:24 PM
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OK Duntov you asked for it

Since we are already off topic. My bores are already at .040 over. Soooo...is it safe to go to .060 over? I had read some people on her debating about how far over you could go?

Only reason I was thinking about just honing was because when I had the motor out last time, there was hardly any ring gap, so I assumed there wasn't much cylinder wear. Like I said, I haven't done any measuring, so not sure of cylindricity or bore taper.
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  #49 (permalink)  
Old 09-27-2010, 05:34 PM
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Quote:
Originally Posted by 1975yellowC3
OK Duntov you asked for it

Since we are already off topic. My bores are already at .040 over. Soooo...is it safe to go to .060 over? I had read some people on her debating about how far over you could go?

Only reason I was thinking about just honing was because when I had the motor out last time, there was hardly any ring gap, so I assumed there wasn't much cylinder wear. Like I said, I haven't done any measuring, so not sure of cylindricity or bore taper.
If its a performance build I would get it sonic tested for cylinder wall thickness and with a bore that big its a good idea to get your block torque plate honed.
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Old 09-27-2010, 07:15 PM
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Not sure what your definition of "high performance" is, but I am hoping for around 400hp. Is this still going to need sonic testing?
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Old 09-27-2010, 09:29 PM
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It would be advisable if you are going to bore it .060" over. Its always a risk when boring that far.

CNC Blocks will tell you it has to be done, but he is in a business of machining and shipping blocks all over, he has to stand behind his work and for him to not sonic check is an unacceptable risk for him.

I've had some bored .060" locally in the past without checking as no one close to me had a checker, but my machinist informed me of the risk and I knew that. I had no problems, but some have, it is always a possibility. I've heard the figure between 1 in 7 and 1 in 10 350 SBC's will be too thin at +.060" for performance work(500 hp-up street/strip, 450hp circle track). Carl (CNC Blocks) might be able to give better figures on this.
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Old 09-27-2010, 10:56 PM
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An SBC block is the cheapest part of the build.

If it is a 0010 block then there are pistons available through the machine shop catalogs in 080" if it makes you feel any better about your 060 chances. I've never had a 0010 60 bore that didn't pass but I've heard of heating problems on the forums. <could be a lot of other reasons for it.

How much ridge does it have?

Mahle and others sell forged 4.045s but it's not likely it would clean up that easy.
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  #53 (permalink)  
Old 09-28-2010, 05:43 AM
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Quote:
Originally Posted by ericnova72
It would be advisable if you are going to bore it .060" over. Its always a risk when boring that far.

CNC Blocks will tell you it has to be done, but he is in a business of machining and shipping blocks all over, he has to stand behind his work and for him to not sonic check is an unacceptable risk for him.

I've had some bored .060" locally in the past without checking as no one close to me had a checker, but my machinist informed me of the risk and I knew that. I had no problems, but some have, it is always a possibility. I've heard the figure between 1 in 7 and 1 in 10 350 SBC's will be too thin at +.060" for performance work(500 hp-up street/strip, 450hp circle track). Carl (CNC Blocks) might be able to give better figures on this.
On a peformance engine we lie to see .160 at finish size on the skirt sides and wrist pin sides we like to see .120 at finish size. And to meet our specs we don't fine may blocks that will be reliable and have GOOD RING SEAL which is key.

Don't go buy core sift as that has been proven a myth when owning a sonic tester, Inf ack I two blocks in th shop that have no core shift but the cyl walls on one block are .125 average on the thrust side at standard bore on one side of the block only making it junk, The other block has one cylinder that is vvery thin making that block junk.

In all I have about 40 blocks or so that are good for nothing but a stock build because of poor cylinder placement from the factory.

Over the years I have had alot of calls about cracked cylinders and I can see why.

We deal a couple hundred blocks a year and most guys are dealing with one or two blocks a year or their life time.

Our local circle tracks are usig the crate engines and some have failed because of cylinders cracking.

I am also an advocate of plate honing as well.
http://www.camaros.net/forums/showthread.php?t=58964
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Old 10-02-2010, 07:27 PM
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Anyone have experience with this bar

http://cgi.ebay.com/ebaymotors/ws/eB...T#ht_500wt_976

What would it cost for the proper tooling to put this bar into use on location in order to bore an old farm tractor?
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