Sometime within the next 2 weeks I will be starting a complete rebuild on my 86 N/A. While the engine is open I plan on swapping to the s5 high compression rotors and giving the engine a mild street port. This car is my daily driver so I want to keep it very streetable. High power numbers are the last thing on my mind. Mainly I'm thinking about reliability and fuel economy, so the ports will probably stay pretty close to stock. I am thinking all I will do is smooth out the casting. Since I am replacing the rotors, I am also going to replace all of the bearings and seals. I have just bought the Atkins rotary rebuild kit 'C'. I am pretty sure that will include everything I could need. I will be checking all of the specs on everything as I disassemble the motor to see if there is anything else I need to replace.



As I progress, I will keep all of my questions/experiences/pics confined to this thread to keep from cluttering up this section.



If anyone has any comments or advice, don’t hesitate to add them.



Thnx

Andy

 

sounds like you have a good game plan. when you add lighter rotors to the mix you are going to have to get the s5 rear and front counter weights aswell to keep things in balance. the s5 stationary gears are hardened and may be another option to add to your combo. there was a good thread on the criteria of what to check during the inspection of bearings. do a search for this section and i'm sure you'll find it. finally, the key to reliability is to inspect and clearance everything properly. good luck

 

yah thats a good combo!

 

Yeah, I have an s5 flywheel and the front counterweight to balance everything, and I plan on using the s5 stationary gears. The reason I am going to replace all of the bearings is that the gears and the rotors all came out of different engines, and it seemed safer to me to just replace them instead of trying to guess at their condition.

 

yah, you still need to measure clarences i think though

 

Will do.



On one of the rotors there is a little lip, almost a burr, along the apex seal groove. Will this affect anything? If so, should I carefully file it away? It doesn't seem to me that the change of less than a gram worth of metal off of a ~7 pound rotor would disrupt the balance at all, but I cant be sure.



Thnx

Andy



Pic of the rotor:

 

Well, I got the other rotor today, but it looks like it was damaged in shipping. One corner has been bent in as shown in the pic. Would it be possible to bend the corner out again back to its oridional shape?



Thnx

Andy

 

probably not

 

Any chance I can get a second opinion?



Looks like I still need another s5 na rotor.

 

yeah that looks pretty bad