That spacer add some torque? You use the insulator block with it?

 

The guys that know that did this were more into LSR racing.. I figure it might affect ring life. How were the cylinder bores finished?

 

Maybe, don't remember when I did the mod. One thing I did was smooth the passage from carb to the mansfold. It's an old sandcast manifold with the blade in the back. The head actually flows as good with the manifold as a straight stack on the port. I believe I did that after the last dyno run I've done on this bike.. Before I tried both 1 and 2 1in spacers and they didn't really make any difference. The problem was that the motor was being held back by the exhaust and CR.

 

I used either 220 or 280 stones, then about 10 strokes in each direction with a 600 flex.

 

I picked up 2 lbs of torque on the Dyno and yes with High compression builds and higher head temps you will still need the Insulator..

What happens when the gas ports get plugged by carbon? Won't that effect seal down the road?? as in less combustion pressure now behind the ring pushing it out into the cylinder wall...

 

if that happens, it would perform like standard rings I guess, it’s a running experiment.
from the article-
“ Because the ring rotates within the piston ring groove, only a small amount of carbon would be expected to accumulate in the lateral gas ports. Plus, with the use of high-quality engine oil and the proper additive package that includes detergents, the likelihood of these lateral gas ports remaining clean and functional are very good.”

 

Nice clean up around the guides. Awesome thread. I think my favorite since joining this forum.

 

I do the same but probably only 5-6 strokes and use a about a 600 grit brush hone.. I also get to within about 0.001 of finished size with 80 grit stones before going to the finer stones. I like to still see some crosshatch after 60000 miles...

 

This thread is really good for me. I do some minor machining messaging of parts but for the most part I blueprint and send back n forth to a machinist. I’m learning a lot from this thread and want to thank everyone for their comments. Some things substantiate my own opinions and other comments make me question my methods lol.

After I’ve read it a few more times and meditated I would like to comment on the intake tuning with carb spacers and heats.. exhaust too. In that area I’ve spent a lot of time experimenting and I learned many years ago a lot from Denish’ books the High Performance Guides, All three books are valuable to have. Some things worked for me some things didn’t, but the formulas for tuning pipe and intake did work for me. Most revealed through constant mph gains of losses. Mph seemed to reveal best for me.

I can’t wait to later tonight to really dig further into everyone’s comments and the posts.

 

Just a side note, cast aluminium or pot metal will blacken like that with an alkaline base cleaner. Works great with cast iron or steel, alum not so much.