i'm curious about these two questions as well ...



thanks.

looks nice, man. good job.

 

theres a thread here where judge ito explained what clearances he runs and why he runs em

 

Judge Ito Side Seal Thread

 

The logic Greg is that the bearings with creat less friction if they are polished. The oil will stay in place once the E shaft is in place. Call it suction if you will. Polish=smoother=less friction=better.

 

More polished=less surface adhesion=less oil on surface=early failure.



also



At startup there is no oil on a polished surface. You will slowly chew up your e-shaft and bearings at every startup. If you dont bealve me do the experiment I talked about.



Talk to some pistion engine builders on this. They dont do this unless the intent is to start the car once or twice before the next rebuild.



GregW

 

I gave you both pictures of "backcutting" done on larger bridgeports as well as a practical explanation as to why it can only be done so much on the smaller cuts but you seem to have refused to acknowledge that. Refer to the older thread and you'll see my response to your assertion that "others would find my bridgeports to be laughable". You say my work would be considered "laughable", yet I haven't one time ever heard of a bridgeported car that you've done straight through. Can you honestly and actually tell me, with real-world, practical experience, how much of a difference backcutting would make on bridgeport cuts that are small like the ones I do? Did you even know that I do do a form of backcutting to help with the fact that the cut is made 90 degrees perpendicular to the port tunnel?



B

 

On that motor, stock side seals (new) cut to 0.025" clearance gap and Atkins Rotary 2mm 2-piece apex seals.



B

 

siiiiiiiiick!



thx for the pics

 

You can also look at this way. The smoother something is, the more surface area there is, which causes more friction. To decrease friction, you need less surface area, so you need something rough, like teflon. Microscopic views of teflon show that it is not smooth, but very rough, but it has less surface area, so it has less friction. Thats why it works so well.



And also, man I wish my bridge turns out like that. I am starting it this Friday, so I hope I do a good job.

 

Explain to me why this is true? Do you mean surface area making contact, or surface area period?



Very nice pics, the more I look, the more I want to rebuild an engine.