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Re: Rod Big End clearance problem?????? [Re: thecarfarmer] #440129
08/16/09 09:37 PM
08/16/09 09:37 PM
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust Offline OP
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DemonDust  Offline OP
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Yeah I checked for upper and lower one of the first things I thought of. I shaved the edge off the bearing and gained tons of clearance by taking a very tiny bit off. Thanks guys for the tips. I've never had this happen before, then again I've never built an engine like this before...

Thanks for all your input..


SDG Motorsports
Hellcat Demon and Redeye Supercharger CNC Porting
https://www.sdgmotorsports.com/
Re: Rod Big End clearance problem?????? [Re: DemonDust] #440130
08/16/09 09:41 PM
08/16/09 09:41 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Quote:

Yeah I checked for upper and lower one of the first things I thought of. I shaved the edge off the bearing and gained tons of clearance by taking a very tiny bit off. Thanks guys for the tips. I've never had this happen before, then again I've never built an engine like this before...

Thanks for all your input..




Does the rod touch the crank now (side)

Re: Rod Big End clearance problem?????? [Re: MR_P_BODY] #440131
08/16/09 11:38 PM
08/16/09 11:38 PM
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust Offline OP
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DemonDust  Offline OP
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If I push them over and hold them I still have about .013 clearance. Keep in mind before I couldn't even move them a .001. They seem to want to go back to the middle when I rotate the engine. The journals are square. Do I need to take more off the bearing?


SDG Motorsports
Hellcat Demon and Redeye Supercharger CNC Porting
https://www.sdgmotorsports.com/
Re: Rod Big End clearance problem?????? [Re: DemonDust] #440132
08/17/09 12:10 AM
08/17/09 12:10 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Quote:

If I push them over and hold them I still have about .013 clearance. Keep in mind before I couldn't even move them a .001. They seem to want to go back to the middle when I rotate the engine. The journals are square. Do I need to take more off the bearing?




Yep

Re: Rod Big End clearance problem?????? [Re: MR_P_BODY] #440133
08/17/09 12:16 AM
08/17/09 12:16 AM
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust Offline OP
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DemonDust  Offline OP
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Ok, I'll get to it first thing in the morning. I'll let you know how it goes. Do they keep going back to center because there isn't enough chamfer on the bearing?


SDG Motorsports
Hellcat Demon and Redeye Supercharger CNC Porting
https://www.sdgmotorsports.com/
Re: Rod Big End clearance problem?????? [Re: DemonDust] #440134
08/17/09 12:26 AM
08/17/09 12:26 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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MR_P_BODY  Offline
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Romeo MI
Quote:

Ok, I'll get to it first thing in the morning. I'll let you know how it goes. Do they keep going back to center because there isn't enough chamfer on the bearing?




Hard to say but you shouldnt have to push on them,
should slide to the wall of the crank

Re: Rod Big End clearance problem?????? [Re: MR_P_BODY] #440135
08/17/09 10:36 AM
08/17/09 10:36 AM
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust Offline OP
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I made a call down to South Carolina this morning and had sent a few emails to the nascar engine shops I'm in contact with. They told me the same thing to chamfer the bearings. When I told one of them I was scraping the bearing he laughed and said are you crazy???? Use a dremel with a small metal bit. You'll be scraping forever to get enough clearance. Another said they use their lathes to turn them down. Not sure how that works.

But anyway I got my air dremel tool out and put my small metal bit in I use for porting and lightly went over the bearing edge. It does a much smoother job than scraping and it turned out very well. Almost looks machined.

Thanks Mr. P for all the tech help, it's greatly appreciated

Now when I rotate the assembly all the rods go to the radius instead of the center of the crank. I have .040+ clearance between the rods now.


SDG Motorsports
Hellcat Demon and Redeye Supercharger CNC Porting
https://www.sdgmotorsports.com/
Re: Rod Big End clearance problem?????? [Re: DemonDust] #440136
08/17/09 10:37 AM
08/17/09 10:37 AM
Joined: Feb 2005
Posts: 5,207
Menomonee Falls
DemonDust Offline OP
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DemonDust  Offline OP
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Menomonee Falls
I forgot to say, they go tight up against the radius side of the crank now.


SDG Motorsports
Hellcat Demon and Redeye Supercharger CNC Porting
https://www.sdgmotorsports.com/
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