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Rod and Main clearence
January 5 2006 at 7:37 PM
No score for this post Lonnie (Login 63galaxie2)
from IP address 24.182.108.48

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Guys I cant find my book,and I tried the search,but I cant seem to find good clearence #s.Just want to make sure.

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Lem Evans
(Login l-evans7)
69.166.129.47 Re: Rod and Main clearence
No score for this post January 6 2006, 9:03 PM

RPM range , HP est. , and comp ratio ? may get you reply .

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Lonnie
(Login 63galaxie2)
24.182.108.48 Re: Rod and Main clearence
No score for this post January 6 2006, 10:33 PM

Sorry bout that.DUH.Should be around 550hp,around 10:1(0 deck .030 over trw L2404),Football rods.I dont thik Ill shift much past 5,500.Not sure how far the cam will pull(comp .605,[email protected] both sides).This will be driven on the street.Not daily though.

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Mike C. Steinberg
(Login mcsteiny)
69.225.85.32 Bearing clearances...
No score for this post January 7 2006, 2:06 AM

Somewhere between .002 and .0025 would work good. That's about the high end of shop tolerance. That seems to work well with the street motors that arn't being buzzed up too high in rpm's. If you're using a melling HV pump, make sure you have a pan that will hold enough oil. The HV pumps are reputed to keep the oil low in the pans by pumping a lot of oil up into suspension. Also make sure your oil return holes get some attention.

Mike

http://www.mikesteinberg.com



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Lonnie
(Login 63galaxie2)
24.182.108.48 Well I may be in a little trouble
No score for this post January 7 2006, 3:22 AM

When my machenest checked he got .0028 on the rods,0030 on the mains.My crank is 10 10,he said it had split tolerance.Right between the high and low.So I guess I could have a bearing prob?He said if this were a race motor this would be fine.He said I might want to make sure I had at least 40-60lbs of oil presure.As far as the pump,I currently have a standerd pump.If I need to tweek it or switch to an HV... .BTW I love that GASER.

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Mike C. Steinberg
(Login mcsteiny)
69.225.85.32 Bearings...
No score for this post January 7 2006, 4:07 AM

Your machinest is right. You've got a little more clearance than you need. That HV pump is in your future for sure. Glad you liked the Gasser's, thanks.

Mike

http://www.mikesteinberg.com



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kim
(Login kim524)
71.210.118.193 little on the tight side for high performance
No score for this post January 7 2006, 8:33 AM

But if you want to drop it back into where it supposed to be for a factory engine. Get two sets of bearing shells. For the rods jest get a std set and .001 over set, use one half shell from each set and the rod clearance would be .0023, right where ya would like it. For the mains, one std, one .0010 over. Use half of each set of shells and pull .0005 out of the clearance, then the mains come in at .0025.
badda bing, your in stock land.

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Cory
(Login fordman300)
24.144.143.80 Re: little on the tight side for high performance
No score for this post January 7 2006, 10:40 AM

except hes already at .010 under and they dont make .011 under bearings

This message has been edited by fordman300 from IP address 24.144.143.80 on Jan 7, 2006 10:41 AM




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Anonymous
(Login Edkinnard)
204.8.191.249 CLEARENCE
No score for this post January 7 2006, 10:56 AM

What is the spec's. on a performance build, just curious

This message has been edited by Edkinnard from IP address 204.8.191.249 on Jan 7, 2006 10:57 AM




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Lem Evans
(Login l-evans7)
69.166.129.47 Re: CLEARENCE
No score for this post January 7 2006, 11:15 AM

A rule of thumb for race engine is not to have less than .001" per inch of journal .
On a 7000 rpm engine , 900+ HP I use that and add 1/4-1/2 of a thou to it .

This message has been edited by l-evans7 from IP address 69.166.129.47 on Jan 7, 2006 11:15 AM




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Anonymous
(Login Edkinnard)
204.8.191.249 thanks
No score for this post January 7 2006, 11:20 AM

are those all using the high side????

This message has been edited by Edkinnard from IP address 204.8.191.249 on Jan 7, 2006 11:24 AM
This message has been edited by Edkinnard from IP address 204.8.191.249 on Jan 7, 2006 11:23 AM




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RJP
(Login RJP)
207.200.116.200 Better loose than tight
No score for this post January 7 2006, 2:06 PM

I run .0044" on the mains and .0028" on the rods, cast 4.140" crank that I spin to 7500+ rpms.

60 Starliner 460, 61 Starliner 427, 66 Galaxie 428, 67 Fairlane 427, 66 Fairlane 390, 69 F-250 390, 72 Lincoln 460 and 3 Ford powered Hotboats

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Mike C. Steinberg
(Login mcsteiny)
69.225.85.32 Better loose than tight...
No score for this post January 7 2006, 3:03 PM

his engine is not a stroker, and he's not spinning it much more than 6,000 rpm. So, .0025 on the rods and mains should work good. That's not tight

Mike

http://www.mikesteinberg.com



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Barry R
(Login Barry_R)
64.136.27.227 Some specs..
No score for this post January 7 2006, 5:25 PM

Per the development engineer that designed the Federal Mogul race bearings:

"If the clearance exceeds .003 I get lots of phone calls. If it's between .002 and .003 I get amost none". Folks often put a little too much "religion" into bearing clearances.

The clearances he originally posted would work just fine.

Their are some .009 and .011 bearings out there - - unfortunately they are for Chevy applications. I added them back when I had a real job... never got the Ford stuff released before I was on the outside lookin' in

Cup motors are actually running clearances down in the .0015 range - - but thats with small crank journals and perfect parts. Us guys with the big ol' pieces should just follow the above advice... I personally target .0025-.0028 but I don't sweat it too awful much if I am out a bit...

After some soul searching I've pretty much decided against high volume pumps too. Not much benefit there...

Barry Rabotnick
Survivalmotorsports.com

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B Carr
(Login bcr466)
208.186.157.165 Barry, I too use
No score for this post January 7 2006, 7:39 PM

tighter clearance on bngs than used to be considered "race" clearance and also use a stock type pump with those clearances with an end result of good oil pressure not having to use thick oil.

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Bret Powell
(Login PullinBret)
208.31.189.220 So Barry...
No score for this post January 7 2006, 8:25 PM

If you were going to turn a standard stroke BBF to 9000 that was capable of say 900 HP on gas, with steel rods and a good block. Where would you put your clearances? Would you use 3/4 groove, full groove or half groove?

Thanks, Bret

PFC Engines
DTS Dyno and SuperFlow SF600 equipped!

"Pullin For Christ"








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Bret Powell
(Login PullinBret)
208.31.189.243 T.T.T. Barry? N/M
No score for this post January 9 2006, 10:28 PM

,,

PFC Engines
DTS Dyno and SuperFlow SF600 equipped!

"Pullin For Christ"








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Mike C. Steinberg
(Login mcsteiny)
69.225.85.32 What's T.T.T. Bret?...enlighten...n/m
No score for this post January 10 2006, 2:23 AM

n/m

Mike

http://www.mikesteinberg.com>



This message has been edited by mcsteiny from IP address 69.225.85.32 on Jan 10, 2006 2:24 AM




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Damon Sea
(Login Phantasea427)
68.143.65.130 TTT Means To The Top n/m
No score for this post January 10 2006, 9:52 AM

nm

Damon Sea


1983 Mustang Hatch
466 / C4

"If it doesn't fit, Force it. If it breaks then it needed to be replaced anyway"

http://www.geocities.com/wildfire1mustang/damon.htm

http://www.clubhotrod.com/photopost/showgallery.php?ppuser=750&cat=500&thumb=1

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Barry R
(Login Barry_R)
64.136.27.227 Right where I said - - .0026-.0028
No score for this post January 10 2006, 6:02 AM

With it being OK to me if they were anywhere between .0025 and .0030. Only reason they'd be that large is the kinda big diameters on big block cranks.

If you had, for instance a SBC with a Bryant crank, Honda rods and small journal mains I'd be telling you to target .002.

Figure about .001 per inch of crank diameter with .003 as a maximum and you're gonna be close enough to worry about other things.

I personally like the 3/4 groove deal for what its worth.

Barry Rabotnick
Survivalmotorsports.com

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