New Myth...... ah maybe not.

[ChrisCairns]

A .010 under crank can't do tens.

Mine was .010 under when I went 9.98. (Girdled.)

Present engine is .020 under but it won't be as fast. (Girdled.)

Another one on the stand, .020 under, will be in the 9's again. (Girdled.)

My machinist, who is God in my opinion, told me that the thought that cranks will break if under stock thickness started with the old model T's....which were so thin to start with they couldn't risk losing any more metal.

Thoughts?

 

[Blown&Injected]

It is taking such a tiny amount of metal that I just have trouble believing the standard crank would live when the 10/10 or even 20/20 crank will fail. Also, there are lots of people running very fast with cut cranks

 

[jhanson1750]

The only way I can see a cut crank making any diffrence would be if there was a stress riser due to poor machining that would lead to a crack that would propagate and allow the crank to fail.

 

[Reginald West]

Chris
You need to get in out the sun,stop drinking that stuff you brew and forget about them fairy tales.


REG

 

[machinegun]

Myth 2

Stock Cranks can not be welded. I had a good reputable crank guy do one for me. I figure if he can make a large diesel crank survive, mine could. Welded setup correctly with center billet caps. ran 11.50's all dy long with no issues at all. Welded cranks run fine for me.

 

[ChrisCairns]

Perhaps I wasn't clear. The "thoughts" request was to see if anyone has ever heard the old Model "T" idea...that they were too thin originally to have anything cut off of them later and that idea has passed on and now includes all cranks.

Reg....stop eating donuts and get some exercise.

 

[Steve]

I went 10.50's with a .020/.020 crank also with no problems. As a matter of fact that motor is on its 4th year running mid tens now and it has not had an easy life at all, it has 100's of passes on it! My current motor was going to need a .030 cut to clean up and I was a little scared of that becasue that would take the rolled fillet completely out so I went with an Eagle crank. It probably would have been fine but I really wasn't preapred to find out.

 

[turbodave231]

When was the last time you saw ANY crank break right at the rod journal?

I'd guess NEVER!!. I'd be more concerned about grinding away any surface hardening.....which I'm fairly sure doesn't exist on a stock crank.

 

[DCVING 6]

My machinist, who is God in my opinion, told me that the thought that cranks will break if under stock thickness started with the old model T's....which were so thin to start with they couldn't risk losing any more metal.

Thoughts?

Find a new machinist?

 

[jhanson1750]

I wouldn't look for a new machinist unless your running a turbo model "t" ford...

 

[Quick6'n'-K.C.]

Werent you alive when the Model T's were made

HAHA

Well, if your cars is going that fast, then i have nothing to worry about with my .010/.010 crank going 1 second slower.

:biggrin:

BW