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Crack testing

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mooman10_0

Post subject: Re: Crack testing

Posted: Wed Sep 07, 2016 3:25 pm

1098cc

Joined: Fri Sep 10, 2004 6:39 pm
Posts: 1770
Location: Kaniva / Adelaide / Melbourne

cool, as I said earlier I will leave regrind to whoever buys it after I get it tested. But I will get them to measure it up to see how much it is worn :-)

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drmini in aust

Post subject: Re: Crack testing

Posted: Wed Sep 07, 2016 5:08 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW

Well bad news, mine has several cracks, and I'm out of pocket for the test. But at least we didn't put it in a rebuilt motor and have it go BANG!!!

This black light fluorescent test also validated my dyecheck kit, which also showed at least 1 crack.
[edit] This is a basically a magnaflux process. The crank is magnetised and a mixture of kero + iron filings (or modern equivalent) poured over it.
Filings stand on end where a crack is detected.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

Last edited by drmini in aust on Sun Sep 18, 2016 10:21 pm, edited 2 times in total.

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mooman10_0

Post subject: Re: Crack testing

Posted: Wed Sep 07, 2016 5:59 pm

1098cc

Joined: Fri Sep 10, 2004 6:39 pm
Posts: 1770
Location: Kaniva / Adelaide / Melbourne

That sucks, did it ring right with the ping test?

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drmini in aust

Post subject: Re: Crack testing

Posted: Wed Sep 07, 2016 7:37 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW

It wasn't consistent.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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Convertible Mini

Post subject: Re: Crack testing

Posted: Thu Sep 08, 2016 6:54 am

1275cc

Joined: Thu Dec 09, 2004 6:57 am
Posts: 3022
Location: JIMBOOMBA QLD.

And everyone wants things for free.

_________________
DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

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drmini in aust

Post subject: Re: Crack testing

Posted: Thu Sep 08, 2016 12:31 pm

religious status

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39754
Location: near Baulkham Hills, NSW

I went and picked up my dead crank. Was cracked 1/3 of the way round #1 crankpin. Due to the previous regrind gouging the fillet radius.
St George Cranks now routinely crack tests ALL Mini cranks before grinding. Because at least half those he gets in are cracked. :cry:

[edit]
I would be wary of old 1098 cranks now, they flex and suffer from cracking much more than 998 ones do.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:

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69k1100

Post subject: Re: Crack testing

Posted: Fri Sep 16, 2016 10:51 am

998cc

Joined: Sun Sep 04, 2011 10:46 pm
Posts: 526
Location: S.A

I have a crank here that tested good, problem is now I'm afraid to part with it. Also have a 1098 clubman motor sitting somewhere, could be junk too!

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