|
BB Cam bearing bore honing
#2205218
11/30/16 01:57 PM
11/30/16 01:57 PM
|
Joined: Mar 2004
Posts: 231
USA
B5496RR
OP
enthusiast
|
OP
enthusiast
Joined: Mar 2004
Posts: 231
USA
|
Has anyone tried this method that Mike a Muscle Motors uses? http://www.hotrod.com/articles/mopp-0810-mopar-cam-journal-sizing/Seems like the best idea instead of manually clearancing or scraping the bearings. Any know how long it would take to hone a cam bearing bore .006 with the pictured Rigid Lisle 16000 hone with 180 grit stones?
|
|
|
Re: BB Cam bearing bore honing
[Re: B5496RR]
#2205283
11/30/16 03:42 PM
11/30/16 03:42 PM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
I have honed literally thousands of cylinders with a brush like that and they don't remove more than .0001-.0002 if any.
If th cam line is out, you need to fix it with a line bore. Then you need to get oversized bearings.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: BB Cam bearing bore honing
[Re: B5496RR]
#2205308
11/30/16 04:31 PM
11/30/16 04:31 PM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
QuickD100,
Did your machinist line bore the blocks on Big Block Chrysler's or other engines?? I was told by local machine shops and some who sponsor on this board that a BB Chrysler cant be line bored because the cam bearings ID/OD are stepped.
451Mopar,
Thanks for the link!
madscientist,
Are you also speaking of Line boring a BB Chrysler cam bearing bores? As I stated above other machine shops have stated this isnt possible.
I'm not a machinist and not saying anyone is right or wrong, but I attempted to have local machine shops perform this repair including Mopar specialized machine shops and everyone said they either cant do it because the bores are stepped and/or they dont have the proper equipment.
I did try to call and Email Muscle Motors last week but I haven't heard back from them yet. Hence, my reasoning to try and take on the project myself. The article makes it look rather simple as long as you take your time and "measure twice and cut once"
Thanks to all!
The biggest issue is getting oversized bearings. I believe the shop I used to work at has purchased a line bore that will do the job. Just getting bearings. I have to go to town in a couple of weeks and I'll stop by and see. I know he has the tooling to do roller cam bearings. So I can't see why you couldn't line bore a BBM if you can find the bearings.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: BB Cam bearing bore honing
[Re: quickd100]
#2205437
11/30/16 08:12 PM
11/30/16 08:12 PM
|
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
John_Kunkel
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
|
My machinist would line bore the cam bearing bores in the block. If need be he locktited the cam bearing. According to Rick Ehrenberg the factory align-bored the cam bearings, that's why we have so much hassle with fit by simply driving them in and expecting the cam to fit.
The INTERNET, the MISinformation superhighway
|
|
|
Re: BB Cam bearing bore honing
[Re: 451Mopar]
#2205439
11/30/16 08:15 PM
11/30/16 08:15 PM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
The issue I see with using a fixtured cam alignment hone, is it would take alot of time to setup the hone for each cam bore step, then knowing how much to hone without multiple tear-down/set-up of the fixture/hone tool to measure the bores?
It's one set up with however many different cam bores sizes there are. The finish doesn't have to be honed if the tool is sharp, the speed and feed is correct and you don't crowd the machine.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: BB Cam bearing bore honing
[Re: John_Kunkel]
#2205481
11/30/16 09:27 PM
11/30/16 09:27 PM
|
Joined: Aug 2003
Posts: 43,195
Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,195
Bend,OR USA
|
My machinist would line bore the cam bearing bores in the block. If need be he locktited the cam bearing. According to Rick Ehrenberg the factory align-bored the cam bearings, that's why we have so much hassle with fit by simply driving them in and expecting the cam to fit. The one shop that I trusted the most in SO CA( Hollins Auto Machine) told me the problem with the Mopar BB cam tunnels was they where usually undersized from the factory, once he honed them to the proper I.D. the bearings and cams fit fine 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: BB Cam bearing bore honing
[Re: quickd100]
#2205501
11/30/16 10:04 PM
11/30/16 10:04 PM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
The machinist I'm talking about is the same one that came to the rescue on the Moparts Engine Masters entrée and bored and bushed the lifter bores. He's told me a couple different times that he's seen BB mopars that were .020 off the line bore on the cam bearings. And yes the bearings are different sizes but they can still line bored/honed.Dave What is he using for cam bearings. Not saying you can't get them. Just don't recall ever seeing any of them.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: BB Cam bearing bore honing
[Re: Cab_Burge]
#2205903
12/01/16 03:44 PM
12/01/16 03:44 PM
|
Joined: Aug 2005
Posts: 760
Southington Ct.
turbobitt
super stock
|
super stock
Joined: Aug 2005
Posts: 760
Southington Ct.
|
I'm almost positive you can not align bore Mopar cam tunnels due to no way of holding both ends for the tool cutters for the different sizes Every good shop I have had fix the bores uses a rigid hone like the one in the first picture, not a ball hone   I've seen this done and was done on one of my Mega blocks. At least 2 cam bores were about .0015" undersized IIRC. My machinist made mandrels that fit inside the cam bores that guided the boring bar. When a bore was fixed we had a mandrel made for that one and moved over to the next bore to be opened up. To be honest the honing method looks scary at best and looks like it would just bell mouth the bore due to lack of control and guiding of the tooling. AG.
Last edited by turbobitt; 12/01/16 03:47 PM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
|
|
|
Re: BB Cam bearing bore honing
[Re: turbobitt]
#2205918
12/01/16 04:09 PM
12/01/16 04:09 PM
|
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
John_Kunkel
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,817
Rio Linda, CA
|
I would never feel comfortable enlarging a bearing bore with an abrasive tool, too much possibility of grit being impregnated in the soft babbit.
The INTERNET, the MISinformation superhighway
|
|
|
Re: BB Cam bearing bore honing
[Re: John_Kunkel]
#2205944
12/01/16 04:59 PM
12/01/16 04:59 PM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
I would never feel comfortable enlarging a bearing bore with an abrasive tool, too much possibility of grit being impregnated in the soft babbit.
I have made many main bearing spacers, both from cast iron and aluminum, and a couple from bearings. With the aluminum or bearing you don't hone very much. Maybe .0002-.0003 max. Light pressure and a lot of oil. That tool posted in the first post doesn't remove metal so I have no idea how MM is doing what they claim with that tool.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
|
|
