Posted By: w7smallblock
Aluminum rod bearing clearance - 01/29/10 05:00 AM
How much is to much on a 1.88 rod journal with a GRP aluminum rod max rpm of around 8500
Aluminum rod bearing clearance
Posted By: dodgeboy11
Re: Aluminum rod bearing clearance - 01/29/10 05:06 AM
How much do you have and what kind and weight of oil are you running? What kind of main bearings do you run (1/2, 3/4 or full groove)? Is it 1/4 mile only?
I don't think you could go wrong with .0020", taking into consideration the expansion of the rod.
I don't think you could go wrong with .0020", taking into consideration the expansion of the rod.
Posted By: w7smallblock
Re: Aluminum rod bearing clearance - 01/29/10 05:27 AM
It's a new motor no oil choice yet just mocking everything up and checking clearances i have .0037 and have 1/2 groove mains
Posted By: w7smallblock
Re: Aluminum rod bearing clearance - 01/29/10 04:12 PM
Posted By: camastomcat
Re: Aluminum rod bearing clearance - 01/29/10 04:18 PM
Quote:
That sounds about right, .030-.040 rods and 003-.035 on the mains. That's what I have, and I run 5-50 weight Torco synthetic oil.
Posted By: Cab_Burge
Re: Aluminum rod bearing clearance - 01/29/10 06:13 PM
I take it this is drag race only motor, if that is so the clearances you have are more than adequate with any weight oil unless your heating the oil and running zero wieght oil.
Posted By: w7smallblock
Re: Aluminum rod bearing clearance - 01/29/10 10:58 PM
Nobody else has an opinion? I'll bet if this was a 440source post there would be alot of opinions 
Posted By: Sue
Re: Aluminum rod bearing clearance - 01/30/10 01:09 AM
.003-.005 on the rods but side clearence id go .015-.020
Posted By: jamesc
Re: Aluminum rod bearing clearance - 01/30/10 01:12 AM
Quote:
That sounds about right, .030-.040 rods
Posted By: camastomcat
Re: Aluminum rod bearing clearance - 01/30/10 01:31 AM
ooops .003-.004 is what I meant.
Posted By: jamesc
Re: Aluminum rod bearing clearance - 01/30/10 01:47 AM
i know just having fun 
Posted By: bdaz smblk
Re: Aluminum rod bearing clearance - 01/30/10 03:32 AM
Jim a 1.88 rod journal.Hold on I'll go to dads and see what clearance those rice burner rods should have.I didn't now you were building a civic now instead of your demon.
Posted By: mopar_to_ya
Re: Aluminum rod bearing clearance - 01/30/10 04:07 AM
Quote:
I didn't now you were building a civic now instead of your demon.
I was told, from a fellow, far far away
, not mentioning any names
, that it used to be a small block crank, but sat so long it rusted into Bolivian. And that's why the hondazuki,
or yamasaki rod size was needed. 
Just messin' Jim, glad to see you are getting it together.
Posted By: hemigod426
Re: Aluminum rod bearing clearance - 01/30/10 05:05 AM
3-4 thou rod to crank pin bearing clearance 005 thou if blower motor, side clearance is 2x stock steel not 15-20 more like 30-40 thou and 40-60 on blower motor. hope this helps 
Posted By: Bigcube
Re: Aluminum rod bearing clearance - 01/30/10 02:22 PM
People tend to go too tight thinking alum will expand. You need to go looser, keep in mind the alum will expand in ALL directions. I agree with .003-.004.
Posted By: RyanJ
Re: Aluminum rod bearing clearance - 01/30/10 02:31 PM
Quote:
3-4 thou rod to crank pin bearing clearance 005 thou if blower motor, side clearance is 2x stock steel not 15-20 more like 30-40 thou and 40-60 on blower motor. hope this helps
Posted By: webemopes
Re: Aluminum rod bearing clearance - 01/30/10 03:07 PM
are these the heavy duty pathfinder rodbearings? .003 to .004 is good.side clearance on the rods is also pretty important on alum. rods too . it helps keep oil temps down and that is what kills the rods.
Posted By: w7smallblock
Re: Aluminum rod bearing clearance - 01/30/10 04:01 PM
Thanks for the info. Ronnie, Kenny, and Joe i hope this will be the fastest quad 4 in town with one W7 head on it. 
Posted By: mopar_to_ya
Re: Aluminum rod bearing clearance - 01/31/10 03:57 AM
Quote:
i hope this will be the fastest quad 4 in town with one W7 head on it.
Now that's some funny stuff there,
Jim, if you need anything, just call. I need to get up your way to see what's new anyway.
Later
Posted By: w7smallblock
Re: Aluminum rod bearing clearance - 01/31/10 05:34 PM
Ronnie if this weather every breaks you'll have to stop over. I saw the pictures of the inside of Colby's dart trunk on the other post it looks real good. You should post some pictures under members projects.
See ya , Jim
See ya , Jim
Posted By: W7_Scamp
Re: Aluminum rod bearing clearance - 02/01/10 08:21 PM
This means that the shortblock is going together.
When is the rest of it going to be finished?
Are you still doing the Street legal deal? or is this going to be strictly race?
By the way if you're bored tonight stop by We're puttin the Wedge together!
When is the rest of it going to be finished?
Are you still doing the Street legal deal? or is this going to be strictly race?
By the way if you're bored tonight stop by We're puttin the Wedge together!