harbinger of death Posted January 21, 2009 Report Posted January 21, 2009 I was just looking through a snowmobile parts catalog and saw sparkplug indexing washers for sale. does it make much difference having the plugs facing the intake port, or is this another "boost bottle" type improvement? by the way there is a boost bottle in here for sleds lol Quote
AKheathen Posted January 21, 2009 Report Posted January 21, 2009 I was just looking through a snowmobile parts catalog and saw sparkplug indexing washers for sale. does it make much difference having the plugs facing the intake port, or is this another "boost bottle" type improvement? by the way there is a boost bottle in here for sleds lol i can tell you the boost bottle actually helps with sleds; they don't have a x-over tube stock, and it's easy to smoke a belt on the trails, but it helps keep that from happening. i have heard of indexing years back, but it's not one of those all-popular things. i don't know if facing the plugs tward the intakes is right, but on larger bores and four strokes, there is a higher velocity across the plug which is evident on a plug that has been left in long enough to see the wear. it seems like shiming the plug to get the proper index would be a littl unreliable, and could cause your plug to come loose, but i have been modifying the combustion chambers on different engines to combat which has shown increase in power and efficiency, but that is a story for another day. long story short, i wouuldn't recomend it, but you would probably be better off looking into side gapping instead. :thumbsup: Quote
blowit Posted January 21, 2009 Report Posted January 21, 2009 I was just looking through a snowmobile parts catalog and saw sparkplug indexing washers for sale. does it make much difference having the plugs facing the intake port, or is this another "boost bottle" type improvement? by the way there is a boost bottle in here for sleds lol In extremely high tune engine ( like karts) where absolutely everything counts, it has shown some gains, but i really doubt you will see any substantial gains from it in a multi cylinder engine. The theory is to aim the ground strap at the intake to shield the center electrode from "spark snuff" but really could be easily over come by a better ignition system. Because of the most modern combustion head domes, much flow at the point of combustion is very symmetric which would not matter too much with plug indexing. All in all, we have not done enough testing with this to know for sure but tend to lean towards "not applicable" to banshee or similar engines. Many sled motors utilize similar designed heads so I would tend to think they would not benefit from the idea either. Brandon Quote
hollisatp Posted January 21, 2009 Report Posted January 21, 2009 i can tell you the boost bottle actually helps with sleds; they don't have a x-over tube stock, and it's easy to smoke a belt on the trails, but it helps keep that from happening. i have heard of indexing years back, but it's not one of those all-popular things. i don't know if facing the plugs tward the intakes is right, but on larger bores and four strokes, there is a higher velocity across the plug which is evident on a plug that has been left in long enough to see the wear. it seems like shiming the plug to get the proper index would be a littl unreliable, and could cause your plug to come loose, but i have been modifying the combustion chambers on different engines to combat which has shown increase in power and efficiency, but that is a story for another day. long story short, i wouuldn't recomend it, but you would probably be better off looking into side gapping instead. :thumbsup: Any facts on side gapping? I have read about it but not actually heard any hard facts from banshee owners. Quote
deckheight Posted January 21, 2009 Report Posted January 21, 2009 Doesn't hurt, doesn't help either... Quote
shanYE west Posted January 21, 2009 Report Posted January 21, 2009 i can tell you the boost bottle actually helps with sleds; they don't have a x-over tube stock, and it's easy to smoke a belt on the trails, but it helps keep that from happening. I guess i'm confused by this... How does a boost bottle/ x-over tube help keep a belt from breaking on the trails? Quote
MikeNick Posted January 21, 2009 Report Posted January 21, 2009 I guess i'm confused by this... How does a boost bottle/ x-over tube help keep a belt from breaking on the trails? I was wondering the same thing? and he said helps keep ya from smokin a belt not breakin one buddy. Quote
toolman Posted January 21, 2009 Report Posted January 21, 2009 We use to index plugs on our stock car and this was suggested by the engine builder (Baker Engineering)as some hp gains but I can not remember what the dyno showed. We did not use shims we would go thru plugs to find the ones that worked . Quote
motavated Posted January 21, 2009 Report Posted January 21, 2009 buddy of mine runs super pro in a mustang and swears by it but, thats one of those classes who can squeeze ever ounce of power out Quote
gregrob Posted January 22, 2009 Report Posted January 22, 2009 I guess i'm confused by this... How does a boost bottle/ x-over tube help keep a belt from breaking on the trails? X2 lmao Quote
THE358BANSH Posted January 22, 2009 Report Posted January 22, 2009 The first and most important reasoning of indexing sparkplugs is to prevent the ground strap from contacting the dome of the piston. Second, if there is clearance 360 degrees, you should oreientate the groundstrap 180 degrees from the intake charge. This is so that the intake charge has the least amount of resistance to get to the electrode/groundstrap. Personally, I think in a banshee engine, the groundstrap should face forward. My reasoning is that when the main pressure wave of fuel/air enters the cylinder through the transfers, it is being directed up and rearwards to promote better filling of the cylinder while pushing the exhaust gases out. When the charge wraps around the cylinder/head deck and starts to travel forward, it has a 100% unrestricted path to the electrode... Evan Quote
Rodneya Posted January 22, 2009 Report Posted January 22, 2009 I was wondering the same thing? and he said helps keep ya from smokin a belt not breakin one buddy. Probably meant they crack your intakes and cook the motor before you get a chance to do and damage to the belts. :biggrin: :biggrin: Quote
AKheathen Posted January 22, 2009 Report Posted January 22, 2009 smooths out the power hit? bingo. with a boost bottle, you can give it just a little, and the power wont snap harder than the clutch can grab the belt and keep you from smokin a spot in the belt, which makes riddin jerky. proper clutching helps too. the shared chamber introduces the x-over feature, thus increasing power. they also don't weigh shit to a sled motor, so the intakes aren't at risk, unless you get one that's not spaced right, but you'd be cussin at it on install. Quote
shanYE west Posted January 22, 2009 Report Posted January 22, 2009 I was wondering the same thing? and he said helps keep ya from smokin a belt not breakin one buddy. If you smoke a belt.. is it stil useable? sometimes.. and sometimes NOT.. if its not.. then its BROKE. Some people use 'smokin' as a Synonym of breaking, buddy. Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.