experienced engine builders only.

iceminion · 05-22-2008

what are the side effects of re-grinding cranks? I know they get slightly weaker.

Goat blower, logically, if you spun a bearing on a turned crank, how can you blame it on the machine work?

I get the impression that turned cranks get weaker, and the side effect is broken cranks.

If nobody has had turned cranks crack and break on them, then I am going to have the crank re-ground for ~$100

Last I checked 6-bolt 4g64 cranks go for upwards of $300, unless I can find a motor in a junk yard. (good luck with all you fuckers picking the junk yards bare, I know, I checked 6 months ago)

Andrew7dg · 05-22-2008

Quote:

Originally Posted by iceminion

Last I checked 6-bolt 4g64 cranks go for upwards of $300, unless I can find a motor in a junk yard. (good luck with all you fuckers picking the junk yards bare, I know, I checked 6 months ago)

sold one to MAP not that long ago...

blageo23 · 05-22-2008

Quote:

Originally Posted by iceminion

If nobody has had turned cranks crack and break on them, then I am going to have the crank re-ground for ~$100

$100 my ass.
To check for cranks, Grind, Recoat and balance my crankshaft was $355

**Goat Blower** · 05-22-2008

Quote:

Originally Posted by blageo23

$100 my ass.
To check for cranks, Grind, Recoat and balance my crankshaft was $355

Exactly. You can't get a monkey to use emory cloth on a crank for $100.

sleepydsm · 05-22-2008

Quote:

Originally Posted by Goat Blower

Exactly. You can't get a monkey to use emory cloth on a crank for $100.

Hahahaha.

I was so suprised when I asked an engine builder about how polishing is done, he said just some 600 grit. I couldn't believe it.

**Goat Blower** · 05-22-2008

Quote:

Originally Posted by iceminion

Goat blower, logically, if you spun a bearing on a turned crank, how can you blame it on the machine work?

I don't know exactly, I didn't take it apart. Possibly the filets being cut incorrectly? I'm not sure. It went across the country with a car I sold, the bearing spun in Pennsylvania. Personally, I think the new owner didn't check the oil and he knew before he left that it was leaking a bit, but I remain a bit superstitious none the less. There were a lot of spun bearings all over the country at the time and a good percentage were knowledgeable builders who turned their cranks. Basically, for the same money, I'd rather have a good polished one than a turned one.

I know where you can get a good 2.4 shortblock core for around $350, but it's a bit of a drive.