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#1
05-04-2016, 08:35 PM
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bop distributor gear question
I have a bop composite gear off my Mallory I sold. Can it be filled/drilled to fit the msd pro billet o just got .500 msd/.491 Mallory not much of a difference. Or is this a bad idea? Wanting to fire my car this weekend but will be next week until a new gear would show up
Last edited by dirtbkr89; 05-04-2016 at 08:48 PM. |
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#2
05-04-2016, 09:09 PM
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I wouldn't try it myself....jmo
__________________
1994 Formula 535ci NA CV-1 - single 1050 with c14 - 940hp@7000/825tq@5200 Pontiac Powered 4th Gen Project Progress 
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#3
05-04-2016, 11:04 PM
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I did it.
Worked fine for me. |
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#4
05-04-2016, 11:07 PM
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I figured someone has done it seems like .009 isn't much to take out could probably put sand paper on a rod and get that out in a few strokes
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#5
05-04-2016, 11:11 PM
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I used a 1/2 inch dril bit
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#6
05-05-2016, 06:04 AM
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i did it also on a lathe though. I actually need a mallory sized one if you decide to buy a new one
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#7
05-05-2016, 06:38 AM
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A flex hone is handy when stepping a hole up in size. You can sneak up on precise sizes when used carefully.
__________________
1969 Firebird, Tx3-455/468 machined by CVMS E-heads by Dave Wilcox/Comp Cams 300B-6 flat solid 850DP on E-85 by Eric Niefert/T2 1" plastic spacer T-400/PTC 4000/390's/30x9 Hoosier radial slicks,#3400 1.38 60' 6.32 @ 108 MPH at Northeast Dragway NC 5/23/15 (9th pass on new engine) https://m.youtube.com/watch?v=ePCu2v...ature=youtu.be 1.37 60' 6.26 @ 109 half track, 9.86 @ 136 1/4 mile, #3350 11/26/16 at Richmond Dragway (125th pass on new engine) |
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#8
05-05-2016, 07:30 AM
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Just drill it real slow so that the bit does not heat up and expand on you!
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#9
05-05-2016, 07:32 AM
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I did it, no problems.
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#10
05-05-2016, 07:43 AM
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I'm glad to see that other people have done it I'm picking up the new MSD tonight and I will take a look at it. Mystic missile I will send you a message tonight once I see how the fit would be
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#11
05-05-2016, 12:35 PM
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If you are just looking to fire it up, why not just use the gear on new distributor for now??
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Dave Polichena |
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#12
05-05-2016, 12:38 PM
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Always been told with a billet solid roller to use bronze/composite
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#13
05-05-2016, 04:57 PM
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I have heard from a few here that breaking it in on the steel gear will help to feather any sharp edges. Then install BOP gear once break in is done. Not recommending it but it is what I plan to do with my Stump Puller cam
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#14
05-05-2016, 06:45 PM
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I just switched from a Mallory to an MSD and didn't realize there was a difference in size till reading this. I swapped my composite gear onto the MSD without any problems. Does Mallory have 2 different sized shafts?
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Come take a ride http://www.youtube.com/watch?v=P7Y8Awfk2I0 2008, 2013, 2015, 2016, 2019 Central Il Dragway Mod track champion and 2015 IHRA Div 5 Mod champion 
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#15
05-05-2016, 09:07 PM
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BOP makes a composite gear for either shaft diameter I believe.
You may have gotten a MSD part and put it on the mallory not thinking about the .0045" per side hole difference. Most break-in the cam with a bronze gear during dyno runs and then swap in the composite gear once the sharp edges on the teeth of the cam gear are smoothed off a bit. Not really that big of a deal to pull the distributor and change the gear after dyno runs. Obviously change the oil at the same time. The filter will catch the trash from the assembly anyway (along with smome bits of brass from the worn brass gear). I would not run a brass gear for any period of time on the street with a engine you care about. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#16
05-05-2016, 09:12 PM
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This was a used cam so it already wore down a bit. Got it figured out though sold old gear already and new one will be here tomorrow. Just rather be safe than sorry. 10k new motor why risk something for a 125 part lol
Thanks guys |
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#17
05-05-2016, 09:25 PM
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Used cam will be a "non issue" with the other new BOP gear install.
Have fun with your project. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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