dajogejr Posted July 9, 2006 Report Share Posted July 9, 2006 BTW does anyone know what a banshee Jug bored 80 over displaces as far a cc's? Just re-read that... .080 is 370cc Each .010 is about 3 cc, but...keep in mind, your motor stock is 346cc... Not a "true" three fiddy. And of course, this only applies to a stock stroke motor. Quote Link to comment Share on other sites More sharing options...
Axcalibar Posted July 9, 2006 Report Share Posted July 9, 2006 i have ran wiseco's for over 300 hrs an they worn out banshee lost comp Namura's lasted about 30-50 hrs top part was warped like it was over heated an was was never overheated i run a temp gauge Quote Link to comment Share on other sites More sharing options...
Shee-Male Posted July 9, 2006 Report Share Posted July 9, 2006 I'm very pleased to hear you say that very true statment about high octane fuel. It never ceases to amaze me the number of people who think that running a higher octane fuel automatically makes more power. When it comes to cars there is nothing in any automotive compter that has to do with octane, however if a car has a knock sensor the PCM can certainly pull timing to protect the engine. IF it has a knock sensor. The manufacturer programs the compter to run safely on 87 octane fuel at 100 degree outdoor temperature from the factory. This is why you can buy a pre programed chip off the internet that will net some small horsepower gains by adding some timing to the borderline knock table. There is much more to be had from a professional dyno tune but you can gain a few HP by just adding some timing on most cars. But you then HAVE to run 91+ octane fuel. I don't know why but I still put 93 in my Banshee. I did put 4 degrees of timing in it though, so it's better to be safe. BTW does anyone know what a banshee Jug bored 80 over displaces as far a cc's? True, but remember the engine still has to ping in order for the knock sensor to pick it up, you don't get away with it for to long, detination is hands down the most destructive for any engine. Also due to the delayed burn of high octane fuels, an automotive computer may compensat, most OBD2 systems use a pre and post cat. O2 sensors. But since there is non of that on a Banshee and if you run advanced timing, forged pistons and higher octane fuel puts you in th green zone. I use the Wisecos in all the small engines I've built, and so far so good. For automotive use I love Keith Black hypereutectic pistons, even in my 650hp pontiac 455, awsome pistons. Quote Link to comment Share on other sites More sharing options...
ojcool Posted August 16, 2006 Author Report Share Posted August 16, 2006 True, but remember the engine still has to ping in order for the knock sensor to pick it up, you don't get away with it for to long, detination is hands down the most destructive for any engine. Also due to the delayed burn of high octane fuels, an automotive computer may compensat, most OBD2 systems use a pre and post cat. O2 sensors. But since there is non of that on a Banshee and if you run advanced timing, forged pistons and higher octane fuel puts you in th green zone. I use the Wisecos in all the small engines I've built, and so far so good. For automotive use I love Keith Black hypereutectic pistons, even in my 650hp pontiac 455, awsome pistons. A knock sensor is going to pick up knock far before you would hear it with your ears. OBDII cars run at borderline knock almost all the time. I'm not sure what your trying to say about pre and post Cat 02 sensors. After CAT 02 sensors do nothing as far as fuel or timing. They are there for one reason, to verify that the CAT is functioning properly. Detonation is not destructive to ANY automotive engine; Diesel engines run off Detonation. However I know what you ment. Hypereutecnic pistons are a great innovation. Quote Link to comment Share on other sites More sharing options...
deckheight Posted May 15, 2008 Report Share Posted May 15, 2008 Huge difference between a "controlled detonation" in a typical diesel engine designed for it and an "uncontrolled detonation" in a typical spark ignited engine that is not. Likewise, huge difference in uncontrolled detonation in a four stroke with the added stroke to cool the combustion chamber and a two stroke without it. Anything but extremely minor detonation in a two stroke is a very bad thing! IMHO anyway... Displacement of a round cylinder = (Bore X Bore) X 3.1416 X Stroke / 4000 Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted May 15, 2008 Report Share Posted May 15, 2008 Huge difference between a "controlled detonation" in a typical diesel engine designed for it and an "uncontrolled detonation" in a typical spark ignited engine that is not. Likewise, huge difference in uncontrolled detonation in a four stroke with the added stroke to cool the combustion chamber and a two stroke without it. Anything but extremely minor detonation in a two stroke is a very bad thing! IMHO anyway...Displacement of a round cylinder = (Bore X Bore) X 3.1416 X Stroke / 4000 wow old post, it was already determined that this guy is a jackass. so i wont get into how wrong he is about the "detonation" on another note, your equation is missing a part, if your figureing displacement for a motor with more then one cylinder you have to multiply the equation by the number of cylinders. so it would be Displacement of a round cylinder = (Bore X Bore) X 3.1416 X Stroke / 4000 X 2 (for a banshee) resulting in a 421 or another way of doing it is{ bore in mm X bore in mm X stroke in mm X .0007854 X number of cylinders} Quote Link to comment Share on other sites More sharing options...
FireHead Posted May 16, 2008 Report Share Posted May 16, 2008 This is a poll to gauge the quality of the different pistons avalible for the Banshee. Please select the poll answer that best discribes the failure that you (or someone you know) experienced. Please DO NOT post a failure that has a vailid explination, such as incorrect jetting, or any other reasonable explaination for the failure of the part. Please post the experience just don't let something that is unreasonable affect the poll results. Please also detail as much as possible what happend. This should give us a good amount of data about which pistons are the most prone to failure. I could only put 10 options on the poll unfortunatly I wanted to include more brands. I need to be able to vote for mutiple pistons on there not just one. This poll is worthless. :geek: Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted May 16, 2008 Report Share Posted May 16, 2008 I have never had anything but a stock piston fail. Quote Link to comment Share on other sites More sharing options...
'04limited Posted May 16, 2008 Report Share Posted May 16, 2008 my buddies shee is a '98 still has the original top end in it he rides the hell out of it and we just checked his compression about a month ago it was still 115 psi in both cylinders. his engine has never been opened up. just throwing that out there not trying to defend the stock pistons just think its kinda amazing. Quote Link to comment Share on other sites More sharing options...
rtcc Posted May 16, 2008 Report Share Posted May 16, 2008 I changed out the topend on my 96 in february. FOR THE FIRST TIME EVER! It has never been opened up. I had a small headgasket leak and I think I had a jet clog cause my left side went lean for a short time and started to burn a hole in the piston but didnt. I have Wiseco's in now. Anyway, I was really impressed with the stock stuff. Quote Link to comment Share on other sites More sharing options...
deckheight Posted May 18, 2008 Report Share Posted May 18, 2008 wow old post, it was already determined that this guy is a jackass. so i wont get into how wrong he is about the "detonation" on another note, your equation is missing a part, if your figureing displacement for a motor with more then one cylinder you have to multiply the equation by the number of cylinders. so it would be Displacement of a round cylinder = (Bore X Bore) X 3.1416 X Stroke / 4000 X 2 (for a banshee) resulting in a 421 or another way of doing it is{ bore in mm X bore in mm X stroke in mm X .0007854 X number of cylinders} Ooops! Sorry for dragging that old thing back to life... Couldn't help it LOL! I Obvously didn't look at the date! Actually, the equation as defined (Displacement of a round cylinder) is correct. Whereas, your equation is also correct as defined (for a banshee). In fact I will probably start using yours (.0007854)... Saves a few key strokes! Have to disagree on the end result though... 2mm+/- over bore and 54mm stroke??? Maybe I missed something there too. Wouldn't be the first time... Quote Link to comment Share on other sites More sharing options...
csrmel Posted May 19, 2008 Report Share Posted May 19, 2008 stock pistons are great for motors that have stock or mild porting and also have bolt on parts like exhaust, timing, head intake etc. i ran my stock pistons for a few years before going to a bigger setup and when i pulled them out they looked fucking great. and i always ran lean jetting according to most of you guys. lean is mean though. my stock pistons after a few years of abuse look 95% new. rings still within spec for the gap and everything. i could of put them right back in but i had to order a set of 795s if you know what i mean. Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted May 19, 2008 Report Share Posted May 19, 2008 Ooops! Sorry for dragging that old thing back to life... Couldn't help it LOL! I Obvously didn't look at the date!Actually, the equation as defined (Displacement of a round cylinder) is correct. Whereas, your equation is also correct as defined (for a banshee). In fact I will probably start using yours (.0007854)... Saves a few key strokes! Have to disagree on the end result though... 2mm+/- over bore and 54mm stroke??? Maybe I missed something there too. Wouldn't be the first time... The two ways ar the exact same thing. 3.1416 / 4000 = .0007854 so it just eleminates 1 extra step Quote Link to comment Share on other sites More sharing options...
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