jlsolstice Posted October 8, 2007 Report Posted October 8, 2007 I was wondering if you have to drill oil holes in the exhaust port side of the pistons like it says on the paper that came with the pistons? I never have be for and have never had any problems, but if it will help lubricate the cylinders than good shit but if it will cause problems than no thanks.... Someone please help.... Thanks Quote
dajogejr Posted October 8, 2007 Report Posted October 8, 2007 I've never done this in any piston I've ever installed by Wiseco. I've heard of people shaving them down to save weight (rotating mass) and people enlarging intake windows on them to better match up with the intake ports...but never drilling them for oil... The only things that need to get oiled on a two stroke piston is the rings/and pistons, pin and pin bearing. There should be holes in the bottom side of the piston where the pin goes through to lube the pin... All of these get their lube from the premix oil.... Not saying no one has done it...I don't know of anyone that has or why you'd need to. Quote
BellicoseBanshee Posted October 8, 2007 Report Posted October 8, 2007 You only need to drill lubrication holes for cylinders with an exhaust bridge. Example: Wiseco pistons come with two holes for the Honda cylinders with an exhaust bridge. When the cylinder with an exhaust bridge is bored, the face of the bridge must be relieved 0.002-0.004 to allow for bridge expansion, so it is a good idea to drill the third hole to help ensure proper bridge lubrication (same size as the two factory holes making sure they are all in line and equally spaced. If no holes are provided, then all three must be drilled (following the instructions, of course). :geek: NOTE: I may be wrong about the 0.002-0.004 measurement, but that is what I recall. Quote
blowit Posted October 8, 2007 Report Posted October 8, 2007 (edited) I've never done this in any piston I've ever installed by Wiseco.I've heard of people shaving them down to save weight (rotating mass) and people enlarging intake windows on them to better match up with the intake ports...but never drilling them for oil... The only things that need to get oiled on a two stroke piston is the rings/and pistons, pin and pin bearing. There should be holes in the bottom side of the piston where the pin goes through to lube the pin... All of these get their lube from the premix oil.... Not saying no one has done it...I don't know of anyone that has or why you'd need to. You must mean reciprocating mass? I think wiseco has done a good job of making them as light as possible without killing reliability. Shorter pistons don't stabilize very well. I think what he is talking about is oiler holes for bridged type exhaust ports. The 250Rs had this and it was VERY common for that bridge to get very hot and stripe the piston. There are oiler holes in the piston to help combat this problem. We always enlarge them a bit. The banshee does not use the bridged exhaust port so that is not an issue. Brandon Edited October 8, 2007 by blowit Quote
dajogejr Posted October 8, 2007 Report Posted October 8, 2007 Yeah...sorry, thanks Brandon, recip mass... I've never run shaved pistons, install 'em and go. My friend JT ran shaved pistons...and broke a skirt I'm pretty sure.... Quote
Snopczynski Posted October 8, 2007 Report Posted October 8, 2007 Back in the early 90's before wiseco made the pro lite series pistons for the Banshee. JD Racing was doing a super lite cnc'ed piston. They finally got it down to a science after about 10 sets of broken skirts. Quote
jlsolstice Posted October 8, 2007 Author Report Posted October 8, 2007 Awesome, Thanks for everyones input. I didn't think it was meant for the banshee pistons but I just wanted to make sure. Thanks guys... Josh Quote
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