Notices

Question about 428 crank.

 
  #1  
Old 02-17-2006, 07:19 AM
oldmaninva
oldmaninva is offline
Senior User
Thread Starter
Join Date: Jan 2005
Location: Lynchburg Virginia.
Posts: 174
oldmaninva is starting off with a positive reputation.
Question about 428 crank.

Can a 428 crank be rebalanced to use in a 390?
 
  #2  
Old 02-17-2006, 07:52 AM
Freightrain's Avatar
Freightrain
Freightrain is offline
Shiftoholic
Join Date: Jan 2003
Location: Ohio
Posts: 9,532
Freightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud of
I always have my 428 cranks neutral balanced so that you can. That way you can put any plain 390 flywheel on it. It cost a few extra bucks at balance time for the Mallory metal, but worth it later down the road.
 
  #3  
Old 02-17-2006, 07:55 AM
onebad40willys
onebad40willys is offline
Junior User
Join Date: Jan 2001
Posts: 89
onebad40willys is starting off with a positive reputation.
you dont need to rebalance to use. some people say you dont need the external wieght. just need the 390 rod's and 410 piston's or custom piston's. then just have a machine shop balance and blue print it.
 
  #4  
Old 02-17-2006, 08:33 AM
BLKFE
BLKFE is offline
Freshman User
Join Date: Jan 2006
Posts: 35
BLKFE is starting off with a positive reputation.
I don't think I would go there......The difference is in the crank counter weights not the rods. The pistons are recipocating weight as apposed to rotating weight and would not effect the needed flywheel/dampner counter weights. Just my 2 sense.
 
  #5  
Old 02-17-2006, 11:24 AM
Krewat's Avatar
Krewat
Krewat is offline
Admin Newbie
Join Date: Jul 2002
Location: Long Island USA
Posts: 39,882
Krewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputation
Originally Posted by onebad40willys
you dont need to rebalance to use. some people say you dont need the external wieght. just need the 390 rod's and 410 piston's or custom piston's. then just have a machine shop balance and blue print it.
Incorrect!

428 is externally balanced. And the 428 flywheel has a cast-in counterweight in it.

If you want to use a 428 crank, get the flywheel with it.

And then get everything balanced anyway

The problem is, you can't just put a 428 crank in a 390 without different pistons (410).
 
  #6  
Old 02-17-2006, 12:27 PM
Freightrain's Avatar
Freightrain
Freightrain is offline
Shiftoholic
Join Date: Jan 2003
Location: Ohio
Posts: 9,532
Freightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud ofFreightrain has much to be proud of
Ya, I left out the piston differences.

Getting the crank neutral balanced, allows you to run any FE flywheel and not 428 specific parts.
 
  #7  
Old 02-17-2006, 01:18 PM
Krewat's Avatar
Krewat
Krewat is offline
Admin Newbie
Join Date: Jul 2002
Location: Long Island USA
Posts: 39,882
Krewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputationKrewat has a superb reputation
Originally Posted by Freightrain
Ya, I left out the piston differences.

Getting the crank neutral balanced, allows you to run any FE flywheel and not 428 specific parts.
Exactly, but you can't just swap a 428 crank into a 390.

Unless your deck height is HUGE
 
  #8  
Old 02-17-2006, 04:07 PM
BLKFE
BLKFE is offline
Freshman User
Join Date: Jan 2006
Posts: 35
BLKFE is starting off with a positive reputation.
OK, Let me try this again. I have built two 390 motors with 428 crankshafts. They are refered to as a 410 in most circles. When using a 428 crankshaft in a 390 you either A) need to use a 428 flex plate or flywheel which has an weight added to it in a specific location (offset balance),or B) Have the
crankshaft balanced to neutral to match the 390 flywheel or flex plate. I suppose you could also add weight to the 390 flywheel. Most machine shops prefer to neutral balance the 428 crank by adding heavy metal. It seems 428 flywheels are getting hard to find. A word on the pistons....

I used Engine Tech flat tops for a 390 as the compression height came out
perfect and it was alot less $ than having pistons custom made. Go by the
actual comp Height of the after market piston and not what the orignal
390 comp height is. Piston manufactures have a habit of reducing the replacement pistons Comp Height for some reason or other.This allows this 390 piston to work in this application. Make sure to calculate comp ratio
as these two motors came out a little high for daily drivers.
This was 12 years ago so I don't know if Engine Tech still offers the same piston.
 
  #9  
Old 02-17-2006, 04:21 PM
385seriesHemi
385seriesHemi is offline
Posting Guru
Join Date: Jan 2006
Location: Malvern, Ohio
Posts: 1,101
385seriesHemi is gaining momentum as a positive member of FTE.
The 390 is the SAME exact block as a 428 no matter what you think it is and it is a FE SERIES block. If you put the crank in the 390 I think its makes it a 410 which was an engine actually made by Ford back in the day for mercury vehicles.
 
  #10  
Old 02-17-2006, 04:35 PM
bmc69
bmc69 is offline
Senior User
Join Date: Feb 2006
Posts: 212
bmc69 is starting off with a positive reputation.
For the 428 I have sitting on the stand for a Donzi boat install...I used a 428 crank in a '352 casting' block (I don't even remember now what it was to start with), bored for the 428 pistons. The flywheels are readily available and mine is a new Centerforce..they do not have the added weight..they end up with a bunch of holes drilled opposite where the factory weight was cast in. Still the correct counterbalance, whether you add weight on one side or subtract from the other. I picked up a set of the heavy 'Le Mans' rods the easy way..stole 'em out of a 361 FT engine that was in the 'pile' of FEs I have out back.

Since I now have an 'SCJ' configuration in terms of all the parts for the rotating assembly, I must admit that balancing the whole mess gave my balance technician a minor fit because of no hatchet weight on the balancer spacer..but he got er done.

There are numerous ways to skin that cat.
 
  #11  
Old 02-17-2006, 05:40 PM
rusty70f100
rusty70f100 is offline
Post Fiend
Join Date: Jan 2003
Location: Iowa
Posts: 8,600
rusty70f100 is gaining momentum as a positive member of FTE.rusty70f100 is gaining momentum as a positive member of FTE.
I dont even know where to start with this thread.

The 428 crank needs to be rebalanced for usage with a standard FE flywheel or flexplate. Alternatively, you can balance the standard FE flywheel or flexplate to match the crankshaft. Both ways work, just make sure it's right before you put it together. Neutral balancing the crank is probably the best way, since it reduces stress on the crankshaft.

You can put a 428 crank in a TRUCK 390. You still will need new pistons, since the ridge on the cylinder walls will necessitate overboring the cylinders. Truck 390 pistons = 410 pistons.

All FE blocks have a deck height of 10.17"

FT 361 motors do not have Lemans rods. They have standard FE short rods. Same length, so it's easy to confuse 'em. Fortunately they're plenty strong.
 
  #12  
Old 02-17-2006, 06:23 PM
FFR428's Avatar
FFR428
FFR428 is offline
Needsmorecoffee.
Join Date: Oct 2004
Location: CT
Posts: 3,624
FFR428 has a good reputation on FTE.FFR428 has a good reputation on FTE.
And.....LeMans rods used a tri-lobe thread capscrew vs the bolt and nut of the std rods to bolt the cap to the rod. Easy to spot. Also when using a std/CJ 428 crank with LeMans rods you can use the SCJ weighted crank spacer behind the balancer and take weight off the balance weight found on the #6 counterweight and more or less make it into a SCJ balanced crank. The SCJ crank was cast without this balance weight found on std and CJ balanced cranks. That is the basic difference between the SCJ and CJ cranks. The extra weight on the crank nose does stress things a bit on the SCJ's and it's not the best design on Fords behalf. Don't confuse this with the main question asked as I'm pretty far off topic. I just wanted to input my .02 about the CJ vs SCJ balances and the mix and match. There are a few ways to do it.

G.
 
  #13  
Old 02-17-2006, 07:31 PM
rusty70f100
rusty70f100 is offline
Post Fiend
Join Date: Jan 2003
Location: Iowa
Posts: 8,600
rusty70f100 is gaining momentum as a positive member of FTE.rusty70f100 is gaining momentum as a positive member of FTE.
Good call! I'd forgotten about the cap screws.
 
  #14  
Old 02-18-2006, 09:03 AM
bmc69
bmc69 is offline
Senior User
Join Date: Feb 2006
Posts: 212
bmc69 is starting off with a positive reputation.
Oops..my bad. I had a couple 'spare' rods that were same as the ones I used in the 428 build I posted about earlier that came out of FT 361s and I took look-see...and they are C6AE-C rods..not the 7/16-bolt cap screw 'Le Mans' rods.
 
  #15  
Old 02-18-2006, 09:27 AM
oldmaninva
oldmaninva is offline
Senior User
Thread Starter
Join Date: Jan 2005
Location: Lynchburg Virginia.
Posts: 174
oldmaninva is starting off with a positive reputation.
Thanks for the info! If I understand correctly, I can use the 428 crank if I also use a 428 flywheel and not have to do excessive rebalanceing. I know about the differance in deck height, but was not sure about the balance. Is the harmonic balancer on the front different as well ?
 

Thread Tools
Search this Thread
Quick Reply: Question about 428 crank.


Contact Us - About Us - 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.