hill_19 Posted March 2, 2004 Report Share Posted March 2, 2004 Do these Forged Pistons raise the compression, or how do they make the extra HP that they claim? Quote Link to comment Share on other sites More sharing options...
TheBansheeMan86 Posted March 3, 2004 Report Share Posted March 3, 2004 well these are actually some amazing pistons. they are made by wiseco but modified by Vitos (same ones right?). they are lightened, have HUGE ports, so big that they are always taking in fuel during the whole stroke (unlike stock etc), and also have a little "notch" machined out of the front, to advance the exhaust timing. i had a set of these in my 'shee, and they kicked ass! i had top end like a mo'fo'. in fact, i had more top end than my buddy, 2 shees, both T5s, and intake crap, same tires, except he has a nice stage 2 ish port job and standard pistons, and i had no port job and superstock pistons. he had 14/41 gearing and i had 13/43 gearing!!!!!!!! and mine was faster than his!!!!!! he didnt like that seeing how i had $200 pistons and he had $600 porting and mine was faster lol. anyway we "agreed" that they were equal, just for friendship sake. anyway long story short my superstock pistons "gave out" leaving a dime size hole in the top of my left piston. it was NOT from a lean mixture, but pre detenation. the metal just gave away. the right was fine, but the thing was, everything in my motor was advanced, except my fuel. pistons-advanced exhaust timing and more fuel (ports) head- milled so more compression (30/1000") degree key- 4* advanced timing, ports- lightly polished, and i was running 91 octane pump gas. BUT those pistons lasted and ran strong for 2 full years, so i was decently happy. but now i run no degree key, and standard wiseco pistons, just because, well i have plenty of power still, (not as much as before though) and i dont have to worry about lack of reliability. BUT those pistons give u a shit load of top end. in fact i like my bike now cause i have way more bottom end, and is actually rideable in trails lol. but those pistons screamed up hills. in fact my stock clutch went out because of the huge top end power. it would slip at high speeds (5th and 6th gear) because the stock clutch/springs weren't strong enough to "harness" the power. now i run a new ebc clutch with all 6 heavy duty springs, no slippage. my 2 dollars and 2 cents lol Quote Link to comment Share on other sites More sharing options...
99screaminshee Posted March 3, 2004 Report Share Posted March 3, 2004 i had the same problem but mine were good for about 3 months after rebuild i ride alot i dont think ill be buying anymore of those my new wisecos have been in along time now at least 5 months so i like them prolites i like i like lol and yes these pistons r blanks made by wiseco vitos just ports them and adds that lil exhaust notch Quote Link to comment Share on other sites More sharing options...
Tim C Posted March 3, 2004 Report Share Posted March 3, 2004 I don't think the SS Pistons give more compression (the Vito's powers pistons give a bit more compression). I burnt one on Monday but because somehow my dial-a-jet got turned and leaned it out. Pistons don't burn holes in them for no reason-either it is lean or too low of octain in the gas. Vito's SS pistons are made by Wiseco to Vito's specs and should be as good as a normal Wiseco but give you a lot more power. Vito's are also selling a version of these that are cast and are a little cheaper (Wiseco ones are forged) but I ordered another set of forged ones yesterday from Magic Racing. Quote Link to comment Share on other sites More sharing options...
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