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-   FE TALK (http://www.clubcobra.com/forums/fe-talk/)
-   -   Eagle 4.250 Cast Crank Broken (http://www.clubcobra.com/forums/fe-talk/112983-eagle-4-250-cast-crank-broken.html)

D-CEL 06-07-2012 09:50 AM
Hey Eljaro, Chas and all

Sorry all for the delay, as this is a "G job", the paying customers have to come first. But rest assured we have accumulated some very interesting data in the 21.2hrs we have in it so far. I have asked that it be completed soon, we are shooting for the next two weeks. Our initial review suggests a machining defect in the fillet radius as the initiation point, However a problem also exists within the microstructure of the material. The combination of the two appears potentially fatal.
On the good side, if the data proves out, we should be able to offer a fairly accurate NDT acceptance model for checking the microstructure of the material before installation. Here is a hint for the sharp eyed!

http://www.clubcobra.com/photopost/d...0/5-14_001.jpg

http://www.clubcobra.com/photopost/d...0/5-14_002.jpg

Best regards
jason

rpatton3 06-07-2012 10:09 AM
Sorry for the bad news and rotten luck. You will get it figured out and learn from this unfortunate chain of events.

ERA Chas 06-07-2012 11:08 AM
Maybe Eagle should be informed of the results. I think they're machined here-correct?

blykins 06-07-2012 11:26 AM
They're cast/machined in China.

Cobra #3170 06-07-2012 12:38 PM
China
 
Quote:
Originally Posted by blykins (Post 1194398)
They're cast/machined in China.
That is the problem, the stuff they make in China is generally junk. The good news, why fear their military when all the hardware will probably fail in use.

ERA Chas 06-07-2012 12:42 PM
Quote:
Originally Posted by blykins (Post 1194398)
They're cast/machined in China.
Is Scat's cast line machined here Brent? I believe their forgings are...

blykins 06-07-2012 01:14 PM
Yes, all of Scat's line is machined in California.

ERA Chas 06-08-2012 07:32 AM
Quote:
Originally Posted by Eljaro (Post 1194370)
I am glad the journal arrived. I was wondering why it was taking that long. Let's see what comes out of the analysis.
And thanks for your effort, Jason.
Have you started another engine build? Or plan one?

fordracing65 06-08-2012 09:27 AM
Quote:
Originally Posted by cobra #3170 (Post 1194406)
that is the problem, the stuff they make in china is generally junk. The good news, why fear their military when all the hardware will probably fail in use.
That's Funny

fordracing65 06-08-2012 09:50 AM
Quote:
Originally Posted by RICK LAKE (Post 1185415)
ACademic I have been involves with racing since the 70's. Back then we didn't have alot of money to spare on new parts all the time. Mr. Mulvey was a true blacksmith. He could weld, gas weld, stick weld, and bond almost anything to any thing. We cracked a 455 pont motor down the camshaft tunnel into the mains. He repaired the block and we had it remachined. We got 3 years out of it before another crack in the block started and coolant got into the motor. Aluminum blocks are alot easier to repair. We windowed a few in funny car and rail car, about 15. We patched them up all the time with rods holeing out the sides. If you have some of the best welders and machinist with all the broken parts, any thing is repairable.
Here one small note, The crank shaft broke here, would guess from a problem in the cast when made. I do know the hammer trick and have used it for better than 30 years. Cast cranks will run forever if you remember to limit the rpm range. 482 with 4.25 stroke is a good size. I have been running one for 6 years with a Barry R. kit Limit rpms to 6,000 rpms and not bang the limiter and the motor should last for years. Hot dogging and abuse will shorten any motors life. This is not a cheap hobby. I feel for our friend in Spain and his pain. Rick L.
You have to go forged if you want to rev the mighty FE:CRY:

Jerry Clayton 06-08-2012 09:54 AM
I've seen a lot of forged ones break up there also

Eljaro 06-08-2012 01:10 PM
Quote:
Originally Posted by ERA Chas (Post 1194505)
Have you started another engine build? Or plan one?
Yes, but since I have some other financial priorities right now I have put it off for a few more weeks.
I told Keith I wanted a good one (a crank) which would not break and he says a RPM Steel 4340 crankshaft will do.
I hope he knows what he does.

lovehamr 06-08-2012 01:31 PM
For what it's worth, I have a KC scat crank in mine and it's been perfect.

Hope I didn't jinx myself there.....

DAVID GAGNARD 06-08-2012 01:48 PM
Quote:
Originally Posted by lovehamr (Post 1194563)
For what it's worth, I have a KC scat crank in mine and it's been perfect.

Hope I didn't jinx myself there.....
You're screwed,just as soon sell it for scrap iron now and be done with it!!!!!!!!!:LOL::LOL::LOL::LOL:

David

fordracing65 06-08-2012 04:08 PM
Anyone know the difference, similarity of the forged RPM crank and a Scat forged crank, there both chinese, just wondering.

blykins 06-08-2012 07:23 PM
Quote:
Originally Posted by fordracing65 (Post 1194579)
Anyone know the difference, similarity of the forged RPM crank and a Scat forged crank, there both chinese, just wondering.
One needs machine work to be perfect, the other one doesn't...

wideglidejoe 06-08-2012 07:31 PM
Broken block and Scat crank........mine too!
 
Definitely not trying to hijack the thread, but I lost my FE last Saturday at Hallet Racing Circuit out west of Tulsa. I haven't started tearing it down yet because my son was in the hospital Mon-Wed, but he's better now and home. Hopefully I'll start tearing into it this weekend.

428 bore 4.13 X 4.25 Scat rotating assembly. I don't know the extent of the damage yet, but the #3 main bearing cap (broken) and a few block pieces were left on the track. Up until then it sounded fine, no tell-tale noises, knocks, misses or power loss before letting go. Good oil psig (65) and running about 4,800-5,000, then BAM, then silence. Then spinning/sliding backwards at 80 mph because I oil down my tires and the track.

Once I get into it, I'll post some comments and pics.

In the mean time, I'm planning another FE stroker build.

fordracing65 06-08-2012 07:41 PM
Do any FE's stay together? Sorry to hear that.

wideglidejoe 06-08-2012 08:34 PM
Do any FE's stay together?

Yeah, I think we just hear about the ones that break, you never hear about the ones that last a long time.

Back in the late 60's, I had 4 FE's in 3 different vehicles, two stock and two moderately modified. I ran them really, really hard, and all I ever broke was the teeth on the nylon timing gear on one of them, it jumped time. Replaced it with steel gear and new chain, no more problems.

A friend of mine had a FE that was strip only, in a 4,000 lb Galaxie. He ran it several seasons, all he ever did was fresh bearings occasionally, that was it. It would pull the front wheels, I don't remember the times, but I was in awe.

Ibr8k4vetts 06-09-2012 12:35 AM
Quote:
Originally Posted by wideglidejoe (Post 1194605)
Do any FE's stay together?

Yeah, I think we just hear about the ones that break, you never hear about the ones that last a long time.

Back in the late 60's, I had 4 FE's in 3 different vehicles, two stock and two moderately modified. I ran them really, really hard, and all I ever broke was the teeth on the nylon timing gear on one of them, it jumped time. Replaced it with steel gear and new chain, no more problems.

A friend of mine had a FE that was strip only, in a 4,000 lb Galaxie. He ran it several seasons, all he ever did was fresh bearings occasionally, that was it. It would pull the front wheels, I don't remember the times, but I was in awe.
Just what I was thinking! mine is kinda stock and bet the hell out of it!


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