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Teeroy 
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Joined: April 20, 2003
Posts: 3685
Location: Eastern WA
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 Posted: Thu Dec 14, 2017 11:53 pm Post subject: Cam Lobe Clearance |
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I have .040 clearance or more on every point the crank or rods come near the cam except this spot on the #1 #3 crank cheek, its only .028 here. This is probably the stiffest part of the crank, am I good to go or do I hit it with the disc and rebalance the assembly?
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hobbybob517
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Joined: June 02, 2011
Posts: 1194
Location: Netherlands
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| Posted: Fri Dec 15, 2017 2:09 am Post subject: Re: Cam Lobe Clearance |
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Can you maybee degree the cam, and maybee you're lucky
and needs to retard or advance 3 degrees?
just an idea
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jason
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Joined: August 07, 2002
Posts: 3444
Location: Garage
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| Posted: Fri Dec 15, 2017 10:39 am Post subject: Re: Cam Lobe Clearance |
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| One of the reasons to balance after mock up, just saying. |
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Multi69s
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fivelugshortaxle
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| Posted: Fri Dec 15, 2017 12:36 pm Post subject: Re: Cam Lobe Clearance |
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This a 2332? My Buick journal 84 had plenty of room
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maui
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Joined: May 16, 2004
Posts: 438
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| Posted: Fri Dec 15, 2017 2:28 pm Post subject: Re: Cam Lobe Clearance |
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| I had a similar problem wen I had 5.7 rods and 90 stroke so I had my rods contoured smallkine to get my 50 clearance. It costed $40.00 contour and rebalanced. |
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neil68
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Location: Calgary, Canada
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| Posted: Fri Dec 15, 2017 2:30 pm Post subject: Re: Cam Lobe Clearance |
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Is the crank in its proper orientation, as it would be with final end play set? The gap might increase if you slide the crank to its final position and the tapered cam lobe moves away a bit. This still may not give you 0.040”.
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Teeroy
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Joined: April 20, 2003
Posts: 3685
Location: Eastern WA
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| Posted: Fri Dec 15, 2017 4:56 pm Post subject: Re: Cam Lobe Clearance |
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Jason, normally that would be proceedure for me, but this one was balanced already from its first incarnation as a 2007.
This was a NOS made in USA Bugpack 78mm crank.
Maui its the crank web to cam nose not the rod on this one.
Neil yes to dots, no to end play, pushing crank against thrust surface helped some.
I took a finishing file and lightly went over the tight spot (it was coursely clearanced here from the original builder) taking the sharp corner off and have enough room now. didnt hardly remove any material, and being so close to the main journal I doubt the balance changed enough to notice
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jason
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| Posted: Fri Dec 15, 2017 6:31 pm Post subject: Re: Cam Lobe Clearance |
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| What cam is that? I have an 86C with an 86 crank and have a ton of room. |
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Teeroy
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Location: Eastern WA
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| Posted: Fri Dec 15, 2017 6:37 pm Post subject: Re: Cam Lobe Clearance |
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WEB 86B, VW journal 78mm crank. Crank webs are beefy on this
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Dan Ruddock
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| Posted: Fri Dec 15, 2017 6:54 pm Post subject: Re: Cam Lobe Clearance |
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| Looks like they ground the cam with big base circles. What kind of crank is that? Old bugpack? |
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Teeroy
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Location: Eastern WA
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| Posted: Fri Dec 15, 2017 7:51 pm Post subject: Re: Cam Lobe Clearance |
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Yep USA made Bugpack
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Dan Ruddock
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Joined: October 25, 2012
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| Posted: Fri Dec 15, 2017 7:58 pm Post subject: Re: Cam Lobe Clearance |
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| Teeroy wrote: |
| Yep USA made Bugpack |
Yep thought so, better than the current China stuff. Dan |
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nsracing
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| Posted: Fri Dec 15, 2017 9:32 pm Post subject: Re: Cam Lobe Clearance |
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you need to bevel just a little to gain clearance. don't go crazy though just a little.
Do all the fitting and mock assembly before getting all the parts balanced. |
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calvinater
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| Posted: Sun Feb 25, 2018 11:29 am Post subject: Re: Cam Lobe Clearance |
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same issue here . what is minimum acceptable clearance?
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67rustavenger
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| Posted: Sun Feb 25, 2018 12:55 pm Post subject: Re: Cam Lobe Clearance |
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| calvinater wrote: |
| same issue here . what is minimum acceptable clearance? |
0.040" of about the thickness of a "zip" tie according to modok.
Good Luck.
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calvinater
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| Posted: Sun Feb 25, 2018 1:31 pm Post subject: Re: Cam Lobe Clearance |
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thanks 67Rusty,, lost count of mock ups so far, more clearancing ,more cleaning
hows your stroker build going?
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67rustavenger
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| Posted: Sun Feb 25, 2018 2:24 pm Post subject: Re: Cam Lobe Clearance |
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| calvinater wrote: |
thanks 67Rusty,, lost count of mock ups so far, more clearancing ,more cleaning
hows your stroker build going? |
Slowwww! But picking up speed.
I feel ya on the numerous mock ups. I think I have done mine at least ten times now. 
Good Luck.
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I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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Teeroy
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Location: Eastern WA
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Danwvw
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