|
Re: HELP, stroker crank not spinning freely when torque
[Re: dOc !]
#734207
06/27/10 12:57 AM
06/27/10 12:57 AM
|
Joined: Apr 2007
Posts: 807
Toronto, Canada
dirtybee
OP
super stock
|
OP
super stock
Joined: Apr 2007
Posts: 807
Toronto, Canada
|
Quote:
TOSS that knife away and get a 1/4" carbide or steel burr and chuck-it into a drill.
If the crank is straight, and the bearings are at .0024 ... then it HAS TO BE the radis ,.... hit the bearings lightly ...and you should be good-to-go.
i was hoping someone would say something like that. i started with an x-acto, moved up to a ruko pocket blade, i hope taking a little more off will do the trick. i've never done this before so sorry if this seems redundant to some but i don't want to fu$$ this up.
|
|
|
Re: HELP, stroker crank not spinning freely when torque
[Re: 451Mopar]
#734208
06/27/10 01:01 AM
06/27/10 01:01 AM
|
Joined: Apr 2007
Posts: 807
Toronto, Canada
dirtybee
OP
super stock
|
OP
super stock
Joined: Apr 2007
Posts: 807
Toronto, Canada
|
Quote:
What bearings are you using? My stroker kit had the narrow width main bearings 
you prolly have a RB kit, they don't make narrow mains for low deck. i'm using clevite 77.
|
|
|
Re: HELP, stroker crank not spinning freely when torque
[Re: dirtybee]
#734209
06/27/10 02:33 AM
06/27/10 02:33 AM
|
Joined: Dec 2004
Posts: 1,717
Rancho Cucamonga, Calif.
PUNK
top fuel
|
top fuel
Joined: Dec 2004
Posts: 1,717
Rancho Cucamonga, Calif.
|
My initial thoughts were that your bearings were contacting the radiused fillet of the crank. If it was a tall deck I would suggest using a 119M speedpro bearing, but since its a low deck, im not sure what is available for narrow bearings. I guess you will be narrowing the bearings yourself. I have had a machine shop narrow some rod bearings in the past and they turned out just fine.
10.53 @ 125mph. 1.37 60 foot. Caltracs and Monoleafs, AFCO shocks.
Heads by INDIO MOTOR MACHINE; IMM.
CP Pistons, PC Carbs.
|
|
|
Re: HELP, stroker crank not spinning freely when torque
[Re: dirtybee]
#734211
06/27/10 08:58 AM
06/27/10 08:58 AM
|
Joined: Dec 2008
Posts: 1,200
UK
602heavy
pro stock
|
pro stock
Joined: Dec 2008
Posts: 1,200
UK
|
Quote:
Quote:
It sounds like you are using studs. I had a like issue where a Stud was touching a cap internally and when torqued, my end play would go away. I put a stock bolt in and all was fine. I had to have the cap opened up .030" and the stud worked fine.
i also thought of this and may look into opening up the bolt holes in the caps but i don't lose the endplay of 5 or 6 thou when the crank binds?????
Had the same issue wherby #3 cap was tight on studs causing top & bottom bearing to misalign , had to open holes in cap a tad for correct endfloat , this does'nt appear to be you're problem so hold off on opening up cap.
All good experiance when building engines , some guys would bolt up & figure it will clearance itself ater a few miles. 
|
|
|
Re: HELP, stroker crank not spinning freely when torqued
[Re: dirtybee]
#734212
06/27/10 09:20 AM
06/27/10 09:20 AM
|
Joined: Nov 2008
Posts: 660
San Diego
formula S
mopar
|
mopar
Joined: Nov 2008
Posts: 660
San Diego
|
Quote:
i did everything, line hone and install studs
Did you line hone with bolts and then install the studs? If so this could be a problem, line honing needs to be done with whatever fasteners you intend to use 
|
|
|
Re: HELP, stroker crank not spinning freely when torque
[Re: dirtybee]
#734213
06/27/10 09:43 AM
06/27/10 09:43 AM
|
Joined: Jan 2003
Posts: 16,932
NC
440Jim
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,932
NC
|
Quote:
after further scraping on #5 bearing, i can now also torque it and spin the crank freely. now it is just #2 and #4 that cause binding. i have now taken a knife to these bearings twice and the machine shop did this once already. could this just be the radius needing more bearing removed?
It seems you have isolated the problem to those two bearings, and they need more material removed. Some of those stroker cranks have really wide radii and I am not aware of any low deck main bearings that are narrow enough. The RB has more choices in bearings. Are you using the brand crank known for bearing interference issues?
Sounds like the shop that narrowed the bearings for you didn't put them in the block with the crank to see if they went far enough. It is worth a phone call to them to see if they were able to get the crank in with the bearings, during the "trial" assembly. Without the pistons, the crank should turn by hand. Even with the pistons and rings, the steady turning torque should only be 20-30 lb-ft depending on rings.
The cap/stud interference is also possible, but I think the above is the cause from all the posts.
Quote:
seems i already took quite a bit off the bearings already. anybody know how much difference between a clevite regular and narrow main bearing?
Clevite MS-1277HG bearings (RB block) total width of 0.94" and at the chamfer (H) about 0.84"-0.85"
Clevite MS-876P bearings (B block) total width of 0.94"
But one brand crank may need a narrower bearing. I hope this helps you.
|
|
|
Re: HELP, stroker crank not spinning freely when torque
[Re: dirtybee]
#734214
06/27/10 09:54 AM
06/27/10 09:54 AM
|
Joined: Jun 2006
Posts: 916
MB,CAN
PC-CHARGER
super stock
|
super stock
Joined: Jun 2006
Posts: 916
MB,CAN
|
Quote:
Quote:
It sounds like you are using studs. I had a like issue where a Stud was touching a cap internally and when torqued, my end play would go away. I put a stock bolt in and all was fine. I had to have the cap opened up .030" and the stud worked fine.
i also thought of this and may look into opening up the bolt holes in the caps but i don't lose the endplay of 5 or 6 thou when the crank binds?????
You still have end play when the crank binds? If that's the case, you don't have a fillet radius problem. Check the crank for straightness.
|
|
|
Re: HELP, stroker crank not spinning freely when torque
[Re: rowin4]
#734218
06/27/10 11:13 AM
06/27/10 11:13 AM
|
Joined: Apr 2007
Posts: 807
Toronto, Canada
dirtybee
OP
super stock
|
OP
super stock
Joined: Apr 2007
Posts: 807
Toronto, Canada
|
Quote:
Quote:
Quote:
It sounds like you are using studs. I had a like issue where a Stud was touching a cap internally and when torqued, my end play would go away. I put a stock bolt in and all was fine. I had to have the cap opened up .030" and the stud worked fine.
i also thought of this and may look into opening up the bolt holes in the caps but i don't lose the endplay of 5 or 6 thou when the crank binds?????
How much pressure are you putting on the crank to get that end play? How big of a pry bar? .005-.006 isn't much to move with a big stick. Did you try changing the bearings around to different journals?  
i'm reefing on a 18"-20" bar to get endplay. when i got everything back from machinist there was dye on bearings 1,3 and 5 and #1 and #5 were numbered on the back with marker, nothing on the other 2 so i tried switching those 2 around. i'm going out to remove more material, i'll report back later. thanks to everyone.
|
|
|
Re: HELP, stroker crank not spinning freely when torque
[Re: dirtybee]
#734219
06/27/10 11:19 AM
06/27/10 11:19 AM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
you should be able to get your end play reading with a 6" screwdriver. if you need a big long prybar you've certainly got some other issues. when measuring end play, move the crank toward the back of the engine, release pressure on the crank, set the indicator to zero. then move crank toward the front of the engine, release pressure, read the indicator. if you have to hold pressure on the crank, something else is wrong.
|
|
|
Re: HELP, stroker crank not spinning freely when torque
[Re: dirtybee]
#734223
06/27/10 06:18 PM
06/27/10 06:18 PM
|
Joined: Jan 2003
Posts: 16,932
NC
440Jim
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,932
NC
|
Quote:
i used my telescoping gauge and a feeler gauge and found #2 bearing to be 0.0015out of round when torqued,
I don't have a number, but remember the bearings are made to have extra clearance close to the parting line, within maybe 1/4" inch. So if you measured more clearance at the parting line than up and down, that is normal.
|
|
|
|
|
#4 and #5 were not as bad but 
would this cause a tight crank? i suppose yes. i spent $1800 at the machine shop and i'm bummed, they specialize in mopar and have been building race engines since 1977. aaaaaarrrggg!!!
