Callies Dragonslayer Fracture
10-20-2010, 08:44 PM
#1
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Callies Dragonslayer Fracture I just pulled apart my 383 because i had a knock only under load and sounded like a rod but backwards from anyone i have ever had before. number 8 journal was all fractured ripping up the bearing. Anybody had any other problems with callies?
10-20-2010, 08:59 PM
#2
Hmmm...wow I have never heard of a Dragon Slayer doing that before...
How old is this crank? What kind of build was it in ....NA, nitrous, turbo?
Reminds me of what an engine builder told me once...
"I have seen cheap parts on the track and expensive parts on the track. It doesn't matter they ALL break"
How old is this crank? What kind of build was it in ....NA, nitrous, turbo?
Reminds me of what an engine builder told me once...
"I have seen cheap parts on the track and expensive parts on the track. It doesn't matter they ALL break"
10-20-2010, 09:08 PM
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8000 miles and 12 track passes and a couple few on the street and many autocross laps, put in the car 1 year ago. N/A 12:1 with a 6 speed had a 280 XFI with lingenfelter ported heads and intake and now have a Jones Cam Design 242/245@.050.
Last edited by lbmrider927; 10-20-2010 at 09:15 PM.
10-21-2010, 12:28 AM
#4
well I figured some others would chime in...
how did the rest of the bearings look? Did you blueprint the motor when putting it together or did you have a shop do it?
If this was an Eagle crank you would already have 2 pages of replies saying how bad eagle sucks, china made...etc...
how did the rest of the bearings look? Did you blueprint the motor when putting it together or did you have a shop do it?
If this was an Eagle crank you would already have 2 pages of replies saying how bad eagle sucks, china made...etc...
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10-21-2010, 06:09 AM
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Bolts were all tight and I had this motor built blueprinted and balanced and I ran 100 octane most of the time and the tops of the pistons look like new yet so detonation was very little and I still run a knock sensor.
10-21-2010, 06:37 AM
#11
I don't have experience with crank shafts or their alloys but here is my 2 cents.
Having worked with different types of steel alloys and by looking at those pictures it appears to me those are heat fractures. I've seen cases where higher carbon alloys develop small shallow heat fractures on the surface if extreme heat is focused on one area quickly. Judging by the scoring on the one side of the journal from the bearing there is a good chance excessive heat was present at one point.
Having worked with different types of steel alloys and by looking at those pictures it appears to me those are heat fractures. I've seen cases where higher carbon alloys develop small shallow heat fractures on the surface if extreme heat is focused on one area quickly. Judging by the scoring on the one side of the journal from the bearing there is a good chance excessive heat was present at one point.
10-21-2010, 01:34 PM
#18
I'll ch9ime in and say that it looks more like a secondary issue. I'd look into what was hitting the bottom of the cylinder wall. The little fractures look like heat issues, probably caused by the bearing going bad after rod contact with the cyl. wall....that's just my opinion. If you send pics to callies, I wouldn't include the pics of the cyl. wall, since most companies will call that into play. Since there is no real way of knowing they'll probably tell you to take it back to the builder and go from there....
just my $.02
just my $.02
10-21-2010, 04:05 PM
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I have seen a few different cranks crack like this due to heat from a failed bearing. I do not see how it would fail from a load related issue as there is little to no load on that side of the journal. How did the #5 main look and how about the oil passage in the crank going from the rod journal to the main .. kinda looks like most oil starvation failures I have seen. If the oil system picked up some trash you should see some scoring on the #5 main as well.