Re-manufactured crankshafts?
09-20-2014, 07:40 PM
#1
Elite Member
Thread Starter
iTrader: (4)
Join Date: Mar 2012
Location: Northern VA
Posts: 4,648
Total Cats: 544
Re-manufactured crankshafts?
Has anyone tried a re-manufactured crankshaft?
This company sells them for $221 after a core return. I am considering getting one then measuring/sizing some ACL Race Bearings accordingly. Should I just buy used and stay away form remanned?
http://www.northernautoparts.com/part/ck-93041
1994-1996 110cid, 1.8L, 1839cc BP Mazda Engine, Neck size is 1.063", With Casting Number B630, BP02, G6
You must match your Casting Number with the Casting Numbers listed, before you order your Crankshaft Supply, Crankshaft Part Number 93041
Crankshaft Supply Ford Re-manufactured Crank Kits
Crankshaft Supply Re-manufactured Stock Cranks. These Crankshaft Supply Ford Crankshafts are thermal cleaned, steel shot blasted, bolt holes and keyways inspected, centerline checked, straightened and magnafluxed. Necks, flanges and badly worn journals are restored, bearing journal surfaces machined, polished, oil holes chamfered, thoroughly cleaned, with filleted radius to maintain OE specs. Bearings are included with Crankshaft unless noted.
Core Return Policy - Cores returned for credit need to be sent at shippers expense in rebuild-able condition. Return cores "rust-free". We recommend you return it in the package sent to you. To insure prompt credit for your core, enclose a clear copy of your original invoice.
Crankshaft Supply has been repairing and machining Crankshafts, Rods, and more for over 50 years. Crankshaft Supply are the specialists in Crankshaft repair. . Crankshaft Supply is proud of their dedicated staff, and their dedication to your satisfaction
Crankshaft Supply Ford Crankshaft Kits Are:
Thermal Cleaned
Steel shot blasted
Bolt holes and keyways inspected
Worn journals are restored
bearing journal surfaces are machined, polished
Oil holes chamfered and deburred
Oil line passages clean and rust inhibitor applied
Crankshafts are packed and covered with two-mil poly film and encapsulated with sprayed foam
Main and Rod Bearings are included, unless noted
The poly film is a Rust inhibitor therefor you must wash the entire crank with soap and water at least 6 hours before you install it ( we recommend that you rinse your crank at least three times to remove all traces of soap)
This company sells them for $221 after a core return. I am considering getting one then measuring/sizing some ACL Race Bearings accordingly. Should I just buy used and stay away form remanned?
http://www.northernautoparts.com/part/ck-93041
1994-1996 110cid, 1.8L, 1839cc BP Mazda Engine, Neck size is 1.063", With Casting Number B630, BP02, G6
You must match your Casting Number with the Casting Numbers listed, before you order your Crankshaft Supply, Crankshaft Part Number 93041
Crankshaft Supply Ford Re-manufactured Crank Kits
Crankshaft Supply Re-manufactured Stock Cranks. These Crankshaft Supply Ford Crankshafts are thermal cleaned, steel shot blasted, bolt holes and keyways inspected, centerline checked, straightened and magnafluxed. Necks, flanges and badly worn journals are restored, bearing journal surfaces machined, polished, oil holes chamfered, thoroughly cleaned, with filleted radius to maintain OE specs. Bearings are included with Crankshaft unless noted.
Core Return Policy - Cores returned for credit need to be sent at shippers expense in rebuild-able condition. Return cores "rust-free". We recommend you return it in the package sent to you. To insure prompt credit for your core, enclose a clear copy of your original invoice.
Crankshaft Supply has been repairing and machining Crankshafts, Rods, and more for over 50 years. Crankshaft Supply are the specialists in Crankshaft repair. . Crankshaft Supply is proud of their dedicated staff, and their dedication to your satisfaction
Crankshaft Supply Ford Crankshaft Kits Are:
Thermal Cleaned
Steel shot blasted
Bolt holes and keyways inspected
Worn journals are restored
bearing journal surfaces are machined, polished
Oil holes chamfered and deburred
Oil line passages clean and rust inhibitor applied
Crankshafts are packed and covered with two-mil poly film and encapsulated with sprayed foam
Main and Rod Bearings are included, unless noted
The poly film is a Rust inhibitor therefor you must wash the entire crank with soap and water at least 6 hours before you install it ( we recommend that you rinse your crank at least three times to remove all traces of soap)
Reply
0
0
09-26-2014, 02:32 PM
#7
Elite Member
Thread Starter
iTrader: (4)
Join Date: Mar 2012
Location: Northern VA
Posts: 4,648
Total Cats: 544
The idea is building a motor on the side. I don't have a spare crank on hand to send to a machine shop so it's whatever the cost of a used crank plus cost of machining.
Here is an option that satisfies both, but as others have pointed out, one cannot be certain if the product provided is cast or forged. I'll shop for a used one I guess.
At least we now have recent discussion for future persons interested in this topic.
Here is an option that satisfies both, but as others have pointed out, one cannot be certain if the product provided is cast or forged. I'll shop for a used one I guess.
At least we now have recent discussion for future persons interested in this topic.
Reply
0
0
09-26-2014, 05:38 PM
#8
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,652
Total Cats: 3,011
Factory Miata cranks are forged steel and the journals are nitrided for wear resistance and strength. Some of the other cranks for BPs are just cast. Remanufactured Miata forged cranks may have been turned so that the nitriding on the bearing surfaces may be gone and the cranks are not as good. Used Miata cranks in good condition are the best bet.
Reply
1
1
09-26-2014, 06:39 PM
#9
But it can take a couple of BP blocks before you find a crank in good condition without marks etc that you may want to get rid of.
I turned my rod jounals and is using Mazda OS bearings, but I don't plan on running 200k miles without tearing it down. I have different goals than OEM.
I turned my rod jounals and is using Mazda OS bearings, but I don't plan on running 200k miles without tearing it down. I have different goals than OEM.
Reply
0
0
09-30-2014, 04:19 PM
#10
Elite Member
iTrader: (37)
Join Date: Apr 2010
Location: Very NorCal
Posts: 10,441
Total Cats: 1,899
In reality, how important is the "nitriding" to the health/longevity of the crank and bearings? Is this something that is destroyed by simple micro-polishing?
Six, you make it sound like everyone who's ever had a crank reground has destroyed it.
Obviously an unmolested surface is best, but its not always an option.
Related: How many torques are the Protegé guys pushing through the cast cranks before destruction?
Six, you make it sound like everyone who's ever had a crank reground has destroyed it.
Obviously an unmolested surface is best, but its not always an option.Related: How many torques are the Protegé guys pushing through the cast cranks before destruction?
Reply
0
0
09-30-2014, 04:25 PM
#11
In reality, how important is the "nitriding" to the health/longevity of the crank and bearings? Is this something that is destroyed by simple micro-polishing?
Six, you make it sound like everyone who's ever had a crank reground has destroyed it. Obviously an unmolested surface is best, but its not always an option.
Related: How many torques are the Protegé guys pushing through the cast cranks before destruction?
Six, you make it sound like everyone who's ever had a crank reground has destroyed it.
Obviously an unmolested surface is best, but its not always an option.Related: How many torques are the Protegé guys pushing through the cast cranks before destruction?
Nobody ***** with B8 SOHCs.
That said, i can't remember the last time i saw pretty much any 4 cylinder motor break cranks repeatedly. For your basic cookie cutter turbo miata build, i'd trust a B8 crank to hold up just fine.
Would i care enough to seek one out? Not for a turbo car. (I am specifically seeking out a cast crank for the next Escort motor, though. Because light weight.)
Would i trust a crank from Northern? Sure.
Reply
0
0
09-30-2014, 05:23 PM
#12
Junior Member
Join Date: Sep 2012
Posts: 440
Total Cats: 3
Tons of cars out in our world with a couple hundred thousand miles on cast cranks. Tons of cars out in our world making lots of power on cast cranks. Is forged better? Yes. Is it necessary? Not for 99% of the builds on this forum.
Reply
0
0
09-30-2014, 07:31 PM
#13
In reality, how important is the "nitriding" to the health/longevity of the crank and bearings? Is this something that is destroyed by simple micro-polishing?
Six, you make it sound like everyone who's ever had a crank reground has destroyed it. Obviously an unmolested surface is best, but its not always an option.
Related: How many torques are the Protegé guys pushing through the cast cranks before destruction?
Six, you make it sound like everyone who's ever had a crank reground has destroyed it.
Obviously an unmolested surface is best, but its not always an option.Related: How many torques are the Protegé guys pushing through the cast cranks before destruction?
Reply
0
0
10-01-2014, 12:22 AM
#14
Elite Member
iTrader: (37)
Join Date: Apr 2010
Location: Very NorCal
Posts: 10,441
Total Cats: 1,899
Exactly how much lighter?
Reply
0
0
10-01-2014, 08:56 AM
#15
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,652
Total Cats: 3,011
Plenty of used crankshafts to choose from:
FORD ESCORT (1994 - 1996)
KIA SEPHIA (1995 - 2001)
KIA SPECTRA (2000 - 2004)
MAZDA MX-5 MIATA (1994 - 2005)
MAZDA PROTEGE (1994 - 1998)
MERCURY TRACER (1994 - 1996)
BP05; Neck diameter 1.063";
The SOHC BP has a different neck diameter:
Neck diameter .865".; OE Number : BP01
FORD ESCORT (1991 - 1993)
MAZDA PROTEGE (1990 - 1993)
MERCURY TRACER (1991 - 1993)
FORD ESCORT (1994 - 1996)
KIA SEPHIA (1995 - 2001)
KIA SPECTRA (2000 - 2004)
MAZDA MX-5 MIATA (1994 - 2005)
MAZDA PROTEGE (1994 - 1998)
MERCURY TRACER (1994 - 1996)
BP05; Neck diameter 1.063";
The SOHC BP has a different neck diameter:
Neck diameter .865".; OE Number : BP01
FORD ESCORT (1991 - 1993)
MAZDA PROTEGE (1990 - 1993)
MERCURY TRACER (1991 - 1993)
Reply
0
0
