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Dart Iron Eagle SBC Casting Defect Opinions

General engine tech -- Drag Racing to Circle Track

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Kurshuk
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Dart Iron Eagle SBC Casting Defect Opinions

Post by Kurshuk » Thu Jun 23, 2016 8:59 pm

Hello everyone,

Have an Iron Eagle SBC with a casting defect in the #4 main saddle. Just looking for opinions on if this needs to go back to Dart. Noticed it as soon as I opened the box. Thanks! :D
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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by The Radius Kid » Thu Jun 23, 2016 10:09 pm

Send it back.
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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by Norris Marshall » Thu Jun 23, 2016 10:21 pm

Little bit of porosity breaking through at a machined surface. Not a defect. Its fine.

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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by Kazoom » Thu Jun 23, 2016 11:29 pm

Kurshuk wrote:Hello everyone,

Have an Iron Eagle SBC with a casting defect in the #4 main saddle. Just looking for opinions on if this needs to go back to Dart. Noticed it as soon as I opened the box. Thanks! :D
send it back/exchange it

the Dart blocks have had a reputation for CRACKING in the main saddles...

http://forums.corral.net/forums/11440663-post22.html ...
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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by Zmechanic » Fri Jun 24, 2016 12:13 am

Kazoom wrote: send it back/exchange it

the Dart blocks have had a reputation for CRACKING in the main saddles...

http://forums.corral.net/forums/11440663-post22.html
Wow... alldart akhbar? I can appreciate if you have concerns, but that's about the most unprofessional attempt ato bashing a reputable product as I've ever seen.

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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by Kazoom » Fri Jun 24, 2016 3:56 am

Zmechanic wrote:
Kazoom wrote: send it back/exchange it

the Dart blocks have had a reputation for CRACKING in the main saddles...

http://forums.corral.net/forums/11440663-post22.html
Wow... alldart akhbar? I can appreciate if you have concerns, but that's about the most unprofessional attempt ato bashing a reputable product as I've ever seen.
you mean like all the lying/bashing internet dart dealers selling/pushing/pumping dart blocks out of there barns/sheds online
that lie and bash other companys products they dont sell instead of dealing with all the online complaints of busted/cracked Dart blocks?

im not bashing the fart block at all Zmechanic... im just stating the CRACKING FACTS :mrgreen:

and i was referring to mr kick back/YB monty dikho and his alldart akbar fanboy YB taliban...
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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by Kurshuk » Fri Jun 24, 2016 4:58 pm

Thanks for the replies so far... first block I have seen with this porosity in the mains and looking for feedback, with some concern that this could turn into a crack. As this is going to be a large cubic inch sbc, naturally aspirated but pushing the rpm a little. I have no issues with Dart products, nor do i care to hear any bashing, as we all have our moments. Just looking for feedback from the people that build many more engines than me, if this should be left alone or take it to the shop and see if it can be machined out. It would probably cost more to send it back than to machine it anyway.

Thanks!
Tom

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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by The Radius Kid » Fri Jun 24, 2016 6:41 pm

Kurshuk wrote:Thanks for the replies so far... first block I have seen with this porosity in the mains and looking for feedback, with some concern that this could turn into a crack. As this is going to be a large cubic inch sbc, naturally aspirated but pushing the rpm a little. I have no issues with Dart products, nor do i care to hear any bashing, as we all have our moments. Just looking for feedback from the people that build many more engines than me, if this should be left alone or take it to the shop and see if it can be machined out. It would probably cost more to send it back than to machine it anyway.

Thanks!
Tom
I'm not sure where your dilemma is?
Internet talk aside:

1.You paid for a new block.
2.The block has a casting flaw.
3.The flaw could propagate into failure under the loads it was designed for.
4.Why should you risk a lot of your time and associated money/parts using a block that could bite you in the a** down the road?

If they sent me that,they'd be getting it back and shipping me a new one ...... on their dime.
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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by SchmidtMotorWorks » Fri Jun 24, 2016 6:49 pm

If your concern is that the defect is indicative of the casting, you can polish the side of the main web until it has a similar finish as the main bore.

Then look for similar defects on the areas that you polished.

Also look in the bores.
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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by mag2555 » Fri Jun 24, 2016 8:00 pm

I regardless of the defect I really do not like that those oil feed holes ( or any holes in high stress places!) are not chamfered, talk about a invite for a crack to start off!!!

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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by Kurshuk » Fri Jun 24, 2016 10:28 pm

Thanks again, I know I would feel better with a block that didn't have the defect in the #4 main saddle, but I also didn't want to over react. So, this is why I am soliciting the opinions of the vast knowledge and experience at SpeedTalk! Thanks to everyone for your observations and suggestions about other areas to check and to chamfer holes. :)

For the engine builders out there with the machines to make the corrections, would you send the block back or try to machine the defects out if time was not an issue? :?

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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by MadBill » Fri Jun 24, 2016 10:40 pm

I'm no machinist, but I think 'machining it out' would be like reparing a ripped shirt by snipping out the tear.
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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by The Radius Kid » Fri Jun 24, 2016 10:42 pm

Kurshuk wrote:Thanks again, I know I would feel better with a block that didn't have the defect in the #4 main saddle, but I also didn't want to over react. So, this is why I am soliciting the opinions of the vast knowledge and experience at SpeedTalk! Thanks to everyone for your observations and suggestions about other areas to check and to chamfer holes. :)

For the engine builders out there with the machines to make the corrections, would you send the block back or try to machine the defects out if time was not an issue? :?
Send it back.
You have no idea how far that flaw goes into the block.
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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by mag2555 » Sat Jun 25, 2016 6:03 am

Seing as some 3/32" of material was already machined off that Jurnal between the ruff bore and the hone job and the pitting / defect is still there I would send it back pronto!!

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Re: Dart Iron Eagle SBC Casting Defect Opinions

Post by Cubic_Cleveland » Sat Jun 25, 2016 7:12 am

What's the application? What kind of RPM?

I don't think it will be an issue. But being the 4th main, if the crank counterweight layout was average, the balance job average with heavy parts in a max effort endurance application continually changing gears or an offshore powerboat type deal I might investigate further. I would think heat transfer would worry me more in a lower stressed application, but I can't see that ever being a problem either.

If you're still worried do as Jon suggested...
SchmidtMotorWorks wrote:If your concern is that the defect is indicative of the casting, you can polish the side of the main web until it has a similar finish as the main bore.

Then look for similar defects on the areas that you polished.

Also look in the bores.
As for sharp edges in oil feed hole etc., in my experience I have never come across a part no matter how high end that couldn't benefit from some deburring/detailing to some extent.

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