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Author Topic: remove casting flash from crankshaft without rebalance  (Read 2239 times)
rob342
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« on: November 14, 2017, 11:02:42 am »

i have a very good 78k mile shortblock with no ridge i'm planning to clean up, re-ring/bearing and run. i just like to F with things, but don't want to F anything up while i'm at it.

is it OK to clean up the casting flash on the crank without having everything pressed apart and rebalanced? i can't imagine that it weighs much. i'd think the oil that clings on the shelf the flash creates weighs more than the casting flash itself. saying that, i have no clue how well balanced these are from the factory. to the ounce, the gram, 1/10 gram, etc.

just after every 0.1hp and 0.01mpg i can scrounge up for free. makes me learn and helps me sleep better.  i used to be afraid to ask stuff like this, now i'm afraid not to.

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white 92GT, with a black interior, pony rims, 5 speed with a 3.73 gear. came with a gear, exhaust, and a powerdyne. nice little cruiser, i didn't change much yet.

have tw170's, systemax II, 75mm accufab, anderson n41, t5z, ford racing 23lb billet flywheel, and a quarterhorse sitting here. cam may change
RunninHorse
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« Reply #1 on: November 15, 2017, 08:37:54 pm »

Why do you want to remove it?

A pic would help.
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I'm Rob.  Working on my '93 Reef Blue coupe.  Stock internal 302, 80 MAF, 75 TB, Victor 5.0, High Ports, 30# inj., B303, 1.6s, Tremec TKO 3550, Quicktime bell, Fidanza Al flywheel, stage 3 ceramic clutch, & 4.10s.  12.68 @ 111.69
'66 F100 shortbed, 352ci, 3 on the tree - on hold
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85_GT
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« Reply #2 on: November 16, 2017, 08:11:52 am »

It's believed that stress cracks are more likely to occur from those areas.
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85GT, Dart Windsor Jr, Crane 2030 equiv. Performer 5.0, 75mm TB, 88mm Slot, 34lbs injectors, 1 5/8" shorties, 5spd converted to 4R70W with Baumann controller, 3.25 9"
A9L running A9P bin via Quarterhorse with LC-1
rob342
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« Reply #3 on: November 16, 2017, 10:49:29 am »

sorry. i thought i had attached a pic originally.

the casting flash in capture2.jpg looks like it could break off fairly easily.
the flash in capture3.jpg seems to have ground itself down and likely turned into shrapnel.

this is from the engine i WAS building prior to finding cracked 2 & 4  mains. endplay was ~.030 when i disassembled it.  i have another shortblock here in much better shape now.  i'm expecting the crank in the newly acquired shortblock will look similar to this one in terms of casting flash. 

just trying to be detail oriented. if a half hour with a dremel can reduce future shrapnel and slightly reduce windage, i'm all for it.


* IMG_20170716_143606.jpg (4153.75 KB, 3417x2360 - viewed 110 times.)

* Capture2.JPG (44.45 KB, 564x611 - viewed 94 times.)

* Capture3.JPG (44.86 KB, 558x507 - viewed 81 times.)
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white 92GT, with a black interior, pony rims, 5 speed with a 3.73 gear. came with a gear, exhaust, and a powerdyne. nice little cruiser, i didn't change much yet.

have tw170's, systemax II, 75mm accufab, anderson n41, t5z, ford racing 23lb billet flywheel, and a quarterhorse sitting here. cam may change
juiced coupe
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« Reply #4 on: November 16, 2017, 06:30:42 pm »

http://sbftech.com/index.php/topic,32324.0.html
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
rob342
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« Reply #5 on: November 17, 2017, 08:46:22 am »

Page 6, found it. Thank you!
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white 92GT, with a black interior, pony rims, 5 speed with a 3.73 gear. came with a gear, exhaust, and a powerdyne. nice little cruiser, i didn't change much yet.

have tw170's, systemax II, 75mm accufab, anderson n41, t5z, ford racing 23lb billet flywheel, and a quarterhorse sitting here. cam may change
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