Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Estimated HP gains

serialk11r · 01-10-2012, 02:01 AM

Can you quantify the amount of mass that can be trimmed off pistons/rods/(anything else I missed that people swap out?)? And would you happen to know what effect this has on friction? (I read that piston rings, piston skirts, and rod bearings are about 40% of overall engine friction, and that piston rings make up a big portion of that...so not expecting much)

Also can someone share with me the effect of reciprocating mass on response and acceleration...reciprocating mass hits 0 velocity at top and bottom of stroke but the increased peak velocity as speed increases should have an effect right? Something I haven't thought much about.

01-10-2012, 02:01 AM	#176
serialk11r Senior Member Join Date: Mar 2011 Drives: '06 AM V8V Coupe Location: United States of America Posts: 5,279 Thanks: 285 Thanked 1,075 Times in 759 Posts Mentioned: 13 Post(s)	Can you quantify the amount of mass that can be trimmed off pistons/rods/(anything else I missed that people swap out?)? And would you happen to know what effect this has on friction? (I read that piston rings, piston skirts, and rod bearings are about 40% of overall engine friction, and that piston rings make up a big portion of that...so not expecting much) Also can someone share with me the effect of reciprocating mass on response and acceleration...reciprocating mass hits 0 velocity at top and bottom of stroke but the increased peak velocity as speed increases should have an effect right? Something I haven't thought much about. Last edited by serialk11r; 01-10-2012 at 02:26 AM.