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  #41  
Old 07-01-2019, 06:15 PM
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No worries. It is a relevant point and good to mention for future reference.

---------- Post added at 06:15 PM ---------- Previous post was at 05:42 PM ----------

Ok. I heard back from both DynoCams and NR Racing. End result is grind the cam. I’ll update as soon as I do that with pictures and results.
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  #42  
Old 07-01-2019, 09:32 PM
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It’s just strange. I’ve never heard of the rod contacting the cam between the lobes.
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  #43  
Old 07-01-2019, 11:10 PM
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Quote:
Originally Posted by bob58o View Post
It’s just strange. I’ve never heard of the rod contacting the cam between the lobes.
it has happened to me, start the video here at 19 mins 08 seconds https://youtu.be/mBMhE9j1m4Q?t=1148
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  #44  
Old 07-02-2019, 12:24 AM
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Quote:
Originally Posted by KartFab View Post
it has happened to me, start the video here at 19 mins 08 seconds https://youtu.be/mBMhE9j1m4Q?t=1148
Cool video dude!
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  #45  
Old 07-02-2019, 02:14 AM
Mrmonk7663 Mrmonk7663 is offline
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I got off tonight at midnight. At work I picked up a new tool in preparation for grinding the cam. After much thought about how I should do it I decided the air grinder and dremel were not an option.

I picked up an air operated belt sander that uses a 3/8” wide belt. This gave plenty of room to work with.

I wrapped the cam lobes in painters tape to protect them. I started sanding with an 80 grit belt. Then moved on to a 120 once dimensions were close to the stock cam. When I was within a couple of thousandths of the stock dimensions I stopped. From here I polished it a bit via wetsanding with 1500 and 2000 grit paper.

Thinking about balance...the rough area was so inconsistent there is no way it is balanced like a crankshaft is. The lobes are precision made as well as the journals and cam gear. The cam gear and lives are the biggest diameter of the cam so the gyroscopic forces are greatest there. The rough area is close to the center of the cam so the forces are much less. Basically I don’t think balance is an issue to be concerned about, and neither does NR Racing or Dynocams, or Randy I’m here for that matter.

I installed the cam with no side cover. With everything in place I had more than .030 of clearance. I say more because the .030feeler gauge fit fine but is not flexible at that thickness so if you push you move the cam. I took a picture but it was hard to get the lighting right to see the clearance. The clearance where it used to have contact.

Seeing and measuring this I now can appreciate the advice and suggestion of KartFab to invest in a spare sidecover that you cut out which will allow the cam journal to seat but give you access for visual inspection and measurement room.

I put the sidecover back on and rotated the engine. It rotated freely until I got tired of spinning it.

I’m including pictures of the tool I used and the end result. This has been a good lesson that will help me and I’m sure many of you with future builds. Thank you to everyone who contributed to the discussion.

FWIW I placed an order for a spare sidecover to cut up for this build and future builds
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  #46  
Old 09-17-2019, 12:27 AM
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Thanks for all the pics and sharing your methods--I'm no expert on HF's inventory like yourself, but I think that was a great tool choice for completing your mission. It's basically a surgical-level implement for the task.

All that aside, how many of those 3/8" belts did you go through (if any)?
Yeah, this is a product review inquiry...
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  #47  
Old 09-17-2019, 03:33 AM
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No problem. Glad it helped. I only used 2 belts. One lower grit and one higher. It’s a good tool to have around.
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Old 09-17-2019, 08:17 AM
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Quote:
Originally Posted by Mrmonk7663 View Post
No problem. Glad it helped. I only used 2 belts. One lower grit and one higher. Itís a good tool to have around.
Have you gotten this engine fired up and broken in yet? I would love to know how it performs. I know you have invested a lot of love into it. I enjoy a success story if you have one to share!
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  #49  
Old 09-17-2019, 08:28 AM
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I just put a new cam in my go kart and had to grind it on two sides to clear the rod.
It broke my heart a little to have to grind on such a nice piece:
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  #50  
Old 09-17-2019, 10:04 AM
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Originally Posted by Flyinhillbilly View Post
I just put a new cam in my go kart and had to grind it on two sides to clear the rod.
It broke my heart a little to have to grind on such a nice piece:
Wow, I know it did such a gorgeous camshaft !
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  #51  
Old 09-17-2019, 01:31 PM
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Hasn’t been fired up yet. It’s stull on the bench. I haven’t gotten lazy per se, I’m still working on stuff daily. The issue is all the projects haha. I’ve been building a doodlebug, a ct200u ex, and a Baja Warrior. Also just redid the frame on the 285 dingo and am currently working on the 390. The 285 still needs a floorpan though. For reasons that probably don’t make too much sense I like to have all the frames sorted before I start putting engines on. Helps me organize the space I guess as when the karts are cleaned and prepped I move them into my office in the house. As soon as this 390 frame is done I’ll shift gears back to the Bird Baja.
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  #52  
Old 09-17-2019, 04:28 PM
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Well...they look good!
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  #53  
Old 09-17-2019, 05:03 PM
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Thank you buddy. Making progress for sure. Just got another Baja bike delivered to me a couple hours ago. God help me lol.
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Old 09-17-2019, 07:05 PM
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Thank you buddy. Making progress for sure. Just got another Baja bike delivered to me a couple hours ago. God help me lol.
LOL...you'll never get those engines off the shelf!!!
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  #55  
Old 09-17-2019, 07:10 PM
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Lol. It was too good to pass on. There are 3 212s and 1 301 in the garage. I love doing this, just kind of wish I had a friend join in. Always better with buddies.
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  #56  
Old 09-17-2019, 09:23 PM
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