NJFBOA - Home of New Jersey's Camaros and Firebirds - View Single Post

Pampered-Z · 12-12-2008, 09:03 AM

H <> I Look at the weight and material used as the main reasons for their HP ratings. The design H or I has less to do with what HP they will support compared to what they are made of. I 'think" some manufactures perfer H or I as well. With mine the I's were listed as stronger then H.

Think they are referring to Pinned/brushed relates to the rod pin that holds the piston to the rod.

Pinned = Rod pins are pressed in. ( most common )

Brushed = Rod is free floating and held in with retaining clips. (Mostly for all out race egines that are trying to squeeze that last 1 HP out).

** I have no idea why it would make more HP? Maybe with it free floating there is less drag as the piston moves/changes angles???

12-12-2008, 09:03 AM	#16
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	H <> I Look at the weight and material used as the main reasons for their HP ratings. The design H or I has less to do with what HP they will support compared to what they are made of. I 'think" some manufactures perfer H or I as well. With mine the I's were listed as stronger then H. Think they are referring to Pinned/brushed relates to the rod pin that holds the piston to the rod. Pinned = Rod pins are pressed in. ( most common ) Brushed = Rod is free floating and held in with retaining clips. (Mostly for all out race egines that are trying to squeeze that last 1 HP out). I have no idea why it would make more HP? Maybe with it free floating there is less drag as the piston moves/changes angles??? __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it** 4) Repeat!!!