Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

How strong are our cranks?

Old 06-15-2009, 11:32 PM
Senior Member
Thread Starter
iTrader: (7)
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,369
Total Cats: -1
Default How strong are our cranks?

Has anyone seen any crankshaft failures from too much power? I'm wanting to make my built motor work for me. I am going to max out my turbo and then put on a shot of nitrous that will make my differential cry. So, should i worry about the crank?
wes65 is offline  
Old 06-15-2009, 11:38 PM
Elite Member
iTrader: (3)
Mach929's Avatar
Join Date: Oct 2004
Location: lansdale PA
Posts: 2,494
Total Cats: 0

never heard of a crank failure on a miata...actually any car. it's worth trying
Mach929 is offline  
Old 06-15-2009, 11:51 PM
Elite Member
iTrader: (9)
Saml01's Avatar
Join Date: Jul 2007
Location: NYC
Posts: 5,710
Total Cats: 2

never seen a crank fail either, at least not on a street machine.
Saml01 is offline  
Old 06-16-2009, 12:39 AM
Cpt. Slow
iTrader: (25)
curly's Avatar
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,675
Total Cats: 636

'80's EFE's will twist their crank if driven hard. They're generally welded and turned to fix this issue. I think FM had some issues with some of the prototype stoker motors, but I think that was all block's blowing up. I also have never heard of a miata crank failing. You can scrap it by destroying the key way, seal surface, or bearing surface, but that's another story and often repairable.
curly is offline  
Old 06-16-2009, 02:13 AM
Supporting Vendor
iTrader: (31)
Savington's Avatar
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,173
Total Cats: 1,936

The crank is forged steel, so I doubt you'll have an issue.
Trackspeed Engineering
High-Performance Turbo Specialists - Sunnyvale, CA - 650-701-7223 - Email us!
Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
Savington is offline  
Old 06-16-2009, 02:19 AM
iTrader: (7)
Join Date: Jul 2006
Location: nowhere
Posts: 8,254
Total Cats: 2

As markp put it at 500 whp he considered oringing the heads but other than that the **** will hold together.
magnamx-5 is offline  
Related Topics
Thread Starter
Last Post
Build Threads
11-14-2018 12:18 PM
Supercharger Discussion
09-12-2016 08:17 PM
General Miata Chat
09-28-2015 10:44 AM

Thread Tools
Search this Thread
Quick Reply: How strong are our cranks?

Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.