King main bearings ??
#1648957
07/20/14 11:14 PM
07/20/14 11:14 PM
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Joined: Aug 2009
Posts: 2,039
Mooresburg, Tn
'72CudaRacer
OP
top fuel
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OP
top fuel
Joined: Aug 2009
Posts: 2,039
Mooresburg, Tn
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I'm building a 500 ci RB engine and am trying to use King bearings. Wanted HP series, but -.010's are out of stock everywhere (probably from problems in middle east). I got King XP series instead. Had to turn the crank (-.010") and line hone the block. When I fit the bearings, the clearance is all over the place, with the thrust unacceptable (to me). The measurements are as follows; Cyl# Block bore Crank Clearance 1******2.9431"*****2.7397"*****.0032" 2******2.9435"*****2.7397"*****.0031" 3******2.9435"*****2.7398"*****.0025" 4******2.9435"*****2.7399"*****.0035" 5******2.9432"*****2.7398"*****.0031" I pulled the caps back off and rechecked for anything under the bearing shells, but everything looked good. The block bore is off by a total of .0004". The crank varys a total of .0002". I can move the bearing shells around and the measurement follows the shells. I can't move the #3. Anyone see this with King XP bearings before? I've used the HP's with no problem in the past.  Sorry this turned out so long, just need some input from those that have been there before and what did you do to fix it? Thanks, Brian
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Re: King main bearings ??
[Re: '72CudaRacer]
#1648958
07/20/14 11:35 PM
07/20/14 11:35 PM
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Joined: Jul 2010
Posts: 417
reynoldsburg,ohio
poppaj
mopar
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mopar
Joined: Jul 2010
Posts: 417
reynoldsburg,ohio
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I have used them with no problems but prefer clevelite coated series. Stock main caps?
AA/NSS 65'Coronet "Whompin Wedge"
Pop & Son Performance 557" B-1 power
John Holt Chassis
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Re: King main bearings ??
[Re: '72CudaRacer]
#1648962
07/21/14 12:12 PM
07/21/14 12:12 PM
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Joined: Feb 2004
Posts: 3,441
Mo.
supercomp
master
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master
Joined: Feb 2004
Posts: 3,441
Mo.
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Quote:
Quote:
i realize this is not an "answer" but i've done a fair bit of precision measuring over the years and when i see people talking 10ths i'm leery. i'm not questioning you directly but imho it takes a lot to accurately measure .0001" with accuracy and repeatability and i have a pretty nice selection of metrology tooling for a backyard hack
how exactly are you measuring these clearances?
Micrometer and dial bore gauge. Very repeatable. (no plastigauge here  )
Measure crank with mic, set dial bore gauge to the mic and measure the hole.
I can live with #1,2,4 & 5, but #3 is just too tight to suit me.
I agree that to measure .0001" is somewhat subjective when the tool measures .0005".
Brian
Should be .0001 dial indicator.
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Re: King main bearings ??
[Re: rickseeman]
#1648964
07/21/14 03:12 PM
07/21/14 03:12 PM
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Joined: Jan 2003
Posts: 74,970
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,970
U.S.S.A.
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Quote:
.0025 doesn't seem too tight for me. Is it for you folks?
Street car no problem. I had that on the 383 I did the cam break in on yesterday, 40psi hot at idle with Crower cam saver lifters, stock volume oil pump.
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Re: King main bearings ??
[Re: JohnRR]
#1648965
07/21/14 07:38 PM
07/21/14 07:38 PM
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Joined: Aug 2009
Posts: 2,039
Mooresburg, Tn
'72CudaRacer
OP
top fuel
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OP
top fuel
Joined: Aug 2009
Posts: 2,039
Mooresburg, Tn
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Quote:
Quote:
.0025 doesn't seem too tight for me. Is it for you folks?
Street car no problem. I had that on the 383 I did the cam break in on yesterday, 40psi hot at idle with Crower cam saver lifters, stock volume oil pump.
Not a street engine. Drag race only. Should go 6.30's 1/8.
Brian
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Re: King main bearings ??
[Re: Cab_Burge]
#1648970
07/22/14 07:01 PM
07/22/14 07:01 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Run It!!! Big Deal--Looks great
If you were doing a circle track engine that uses .002 and water thin oil then it really really matters but a drag engine --run that thing and for-get it
After it strains a time or two it will be perfect--
Way more issues with how tight the studs are in the block and HOW you pull a torque wrench than with those numbers.
Your build is going great and you just don't know it.
OR...you can buy a half dozen sets --mix /match until you get perfect numbers--It will run exactly the same--you will have spent more $$$$--have lots of useless leftover bearings that will never get used and you will still win or lose based on how you hit the tree and drive the top end
You are good--shut your eyes and keep rolling...
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Re: King main bearings ??
[Re: ]
#1648971
07/23/14 01:30 AM
07/23/14 01:30 AM
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Joined: Jan 2012
Posts: 2,631
Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,631
Stuttgart, Arkansas
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I'm doing a 440/512 bracket motor for a guy. Roller cam maybe 700 hp. The mains are .0029 to .0035. I thought that was a little loose. What do you guys think?
2011 Drag Pak Challenger
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That is to tight for a race motor, especially with RB main sizes 
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