Crank journal sizes opinions - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer Crank journal sizes opinions

Print Thread

Crank journal sizes opinions #1677733 09/27/14 08:30 PM 09/27/14 08:30 PM
Joined: Nov 2007 Posts: 245 Western PA O OldMoparMan OP enthusiast
OldMoparMan OP enthusiast O Joined: Nov 2007 Posts: 245 Western PA	This has probably been beat up fairly well on here but I would like some opinions on crankshaft sizes verses the specs. I have a 1974 318 factory crank with the mains sizes of #1 2.4997, #2 2.4997, #3 2.4991, #4 2.4994, #5 2.4995 the 3 and 4 are the ones in question being .0004 and .0001 undersize. The .0001 doesn't bother me but is the .0004 to much for a street engine and ready for a regrind. Living with ALS help support the search for a cure Thanks http://web.alsa.org/site/TR/Walks/WesternPennsylvania?team_id=347781&pg=team&fr_id=12069

Re: Crank journal sizes opinions [Re: OldMoparMan] #1677734 09/27/14 09:34 PM 09/27/14 09:34 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	.0004 wouldn't bother me a bit but if you are talking .004 it would. I don't like anything looser than .002 and preferably closer to .0015. We never had a problem even with out race engines with these clearances. We were told that this too tight for racing but they held up with out a problem so---------------

Re: Crank journal sizes opinions [Re: OldMoparMan] #1677735 09/27/14 10:50 PM 09/27/14 10:50 PM
Joined: Jan 2003 Posts: 2,005 s. e. pa. C calrobb2000 top fuel
calrobb2000 top fuel C Joined: Jan 2003 Posts: 2,005 s. e. pa.	hi if it is straight , not tapered and round run it !

Re: Crank journal sizes opinions [Re: OldMoparMan] #1677736 09/27/14 11:40 PM 09/27/14 11:40 PM
Joined: Nov 2007 Posts: 245 Western PA O OldMoparMan OP enthusiast
OldMoparMan OP enthusiast O Joined: Nov 2007 Posts: 245 Western PA	The journals are all round I checked them with our calibrated micrometers in multiple spots and did the same on all the rod journals. Thanks for the info Living with ALS help support the search for a cure Thanks http://web.alsa.org/site/TR/Walks/WesternPennsylvania?team_id=347781&pg=team&fr_id=12069

Re: Crank journal sizes opinions [Re: OldMoparMan] #1677737 09/27/14 11:52 PM 09/27/14 11:52 PM
Joined: Dec 2004 Posts: 10,556 Rittman Ohio fourgearsavoy I Live Here
fourgearsavoy I Live Here Joined: Dec 2004 Posts: 10,556 Rittman Ohio	I would loose sleep over myself I like to start out with a fresh smooth true bearing surface. Give yourself peace of mind and cut it 10-10 Gus 8283072-rearviewsavoy.jpg (33 downloads) 64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60

Re: Crank journal sizes opinions [Re: fourgearsavoy] #1677738 09/28/14 02:31 AM 09/28/14 02:31 AM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	For half a thousandth? You'll be lucky to get it back from the crank grinder any better than it is. R.

Re: Crank journal sizes opinions [Re: dogdays] #1677739 09/28/14 01:27 PM 09/28/14 01:27 PM
Joined: Dec 2004 Posts: 10,556 Rittman Ohio fourgearsavoy I Live Here
fourgearsavoy I Live Here Joined: Dec 2004 Posts: 10,556 Rittman Ohio	Quote: For half a thousandth? You'll be lucky to get it back from the crank grinder any better than it is. R. You need to find a new machinist if your stuff doesn't come back perfect like it should. The OP seems concerned about it and if he has any concerns now is the time to make it absolutely perfect. He's thinking about it now do do you think he's gonna forget about that half a thou when he hears a slight noise after the engine is in the car Gus 8283495-rearviewsavoy.jpg (30 downloads) 64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60

Re: Crank journal sizes opinions [Re: OldMoparMan] #1677740 09/29/14 01:55 AM 09/29/14 01:55 AM
Joined: Aug 2003 Posts: 43,284 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,284 Bend,OR USA	Quote: This has probably been beat up fairly well on here but I would like some opinions on crankshaft sizes verses the specs. I have a 1974 318 factory crank with the mains sizes of #1 2.4997, #2 2.4997, #3 2.4991, #4 2.4994, #5 2.4995 the 3 and 4 are the ones in question being .0004 and .0001 undersize. The .0001 doesn't bother me but is the .0004 to much for a street engine and ready for a regrind. Very common on the early 318 to be like this, I've taken Scotchbrite to them to increase the bearing clearances more than once Of course I'm talking on those that where to big from the factory, and out of round and bent Last edited by Cab_Burge; 09/29/14 02:08 AM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Crank journal sizes opinions [Re: Cab_Burge] #1677741 09/29/14 03:55 AM 09/29/14 03:55 AM
Joined: Feb 2007 Posts: 1,025 Las Vegas, NV dodgeboy11 super stock
dodgeboy11 super stock Joined: Feb 2007 Posts: 1,025 Las Vegas, NV	Get a good polish on it and go. You'll likely find more variance in the main housing bores than you've found on the journals. The end clearance is what you need to concern yourself with. Round, straight journals that get you the clearance needed is what you should be after.

Re: Crank journal sizes opinions [Re: OldMoparMan] #1677742 09/29/14 01:12 PM 09/29/14 01:12 PM
Joined: Jan 2012 Posts: 2,677 Stuttgart, Arkansas rickseeman master
rickseeman master Joined: Jan 2012 Posts: 2,677 Stuttgart, Arkansas	Journal sizes don't tell you much. You have to put in the block with the main bearings and check the clearance. That is what matters. 2011 Drag Pak Challenger

Re: Crank journal sizes opinions [Re: OldMoparMan] #1677743 09/29/14 09:53 PM 09/29/14 09:53 PM
Joined: Nov 2007 Posts: 245 Western PA O OldMoparMan OP enthusiast
OldMoparMan OP enthusiast O Joined: Nov 2007 Posts: 245 Western PA	Thanks for all the reply's been ill all weekend and now just getting back on here. To clear up a few points I had this to a buddies local machine shop and it has been polished just to clean up the original scratches and some very slight rust staining. I am going to check the clearances with new bearings in the block and go from there. Thanks again Living with ALS help support the search for a cure Thanks http://web.alsa.org/site/TR/Walks/WesternPennsylvania?team_id=347781&pg=team&fr_id=12069

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1