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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> "wasted spark"? /cgi-bin/YaBB.pl?num=1304790389 Message started by sillydilly on 05/07/11 at 10:46:29 |
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Title: "wasted spark"? Post by sillydilly on 05/07/11 at 10:46:29 hey quick question. I was talking to a few 'mechanic' friends of mine about my bike. We were on topic of installing the cams and I mentioned there was 2 TDCs for the piston and which one I need to use for cam install. One claimed my bike is most likely a 'waste spark' 4 stroke, which means it will spark after the compression stroke AND the exhaust stroke? By saying this it doesnt matter how you install the cam as long as the pistons at TDC it will spark either way, but to make sure you install cam lobes down so that the valves are both closed making it true TDC for the whole engine? This makes sense to me but am I missing something here? |
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Title: Re: "wasted spark"? Post by verslagen1 on 05/07/11 at 11:05:16 true, it's a wasted spark engine and as long as the cam is timed to either tdc, you're good to go. |
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Title: Re: "wasted spark"? Post by sillydilly on 05/07/11 at 11:10:51 thanks! |
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Title: Re: "wasted spark"? Post by CalisOsin on 05/09/11 at 08:44:56 Then how come everything we do, we set the bike to TDC on the compression stoke? |
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Title: Re: "wasted spark"? Post by sillydilly on 05/09/11 at 09:19:53 because the compression stroke sets the CAM to TDC. I believe the piston (crank) rotates 2 for everytime the cam goes once. so if your on the wrong TDC, your cam will be 180 degrees out of rotation which means lobes straight up and valves open. TDC on compression stroke ensures that the pistons at the very top, and more importantly, your valves are both closed with the lobes facing straight down |
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Title: Re: "wasted spark"? Post by CalisOsin on 05/09/11 at 09:24:59 4B515454415C51545441380 wrote:
duh, thanks! I'm having a problem with rectal-cranium inversion this morning. |
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Title: Re: "wasted spark"? Post by justin_o_guy2 on 05/09/11 at 09:27:53 Simple solution.. PLexiglass belly button implant.. You can see where youre going, |
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Title: Re: "wasted spark"? Post by sillydilly on 05/09/11 at 09:29:38 the oil check glass on the clutch cover works good too |
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Title: Re: "wasted spark"? Post by CalisOsin on 05/09/11 at 09:43:29 091610170A0D3C0C3C04161A51630 wrote:
;D HA! |
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Title: Re: "wasted spark"? Post by verslagen1 on 05/09/11 at 10:16:48 Quote:
746E6B6B7E636E6B6B7E070 wrote:
On a stock cam, at both TDC's the valves are closed. So you could be tempted to adjust the valves at any TDC. But don't. Check this out, won't take long promise. Next time you adjust your valves, before you close up, rotate the engine a bit and reach in and feel the gap on the rocker (lift and press, repeatedly) see as you progress in rotation the gap gets larger, not by much, but it does. The reason behind this is mfg tolerances. Thru the compression stroke you want to guarranty full valve closure, so after TDC on the compression stroke they releave the cam so there's more clearance, just to cover all bets. |
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Title: Re: "wasted spark"? Post by Serowbot on 05/09/11 at 10:49:51 I hate waste.... ...any ideas on whet we can do with the other spark?... :-?... ::)... |
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Title: Re: "wasted spark"? Post by ralfyguy on 05/09/11 at 10:51:25 So when I did mine, I had the piston at TDC and intake and exhaust valve rockers I could wiggle a little up and down before I adjusted. I take it that I did it correctly? |
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Title: Re: "wasted spark"? Post by Serowbot on 05/09/11 at 10:56:21 20333E342B35272B520 wrote:
Very likely, yes... Find TDC the easy way... (http://suzukisavage.com/cgi-bin/YaBB.pl?num=1278347767) |
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Title: Re: "wasted spark"? Post by CalisOsin on 05/09/11 at 11:02:28 7365726F77626F74000 wrote:
Very likely, yes... Find TDC the easy way... (http://suzukisavage.com/cgi-bin/YaBB.pl?num=1278347767)[/quote] Serowbot, I just used this trick this weekend and it worked beautifully, thanks a million!! |
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Title: Re: "wasted spark"? Post by MotoBuddha on 05/09/11 at 11:43:48 392F38253D28253E4A0 wrote:
Let's see, you could wire I'm a big azz capacitor, use the wasted spark to charge it, then use it to shoot lightning bolts at bad drivers. |
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Title: Re: "wasted spark"? Post by Serowbot on 05/09/11 at 11:55:17 I like the way you think, Buddha... Deathray!... :o... |
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Title: Re: "wasted spark"? Post by Boofer on 05/09/11 at 21:53:25 Mr Worf, "Make it so." ;D |
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Title: Re: "wasted spark"? Post by WD on 05/10/11 at 07:39:16 Put a second coil on it and install a spark plug at the muffler outlet... Richen the fuel mix... ::) |
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Title: Re: "wasted spark"? Post by justin_o_guy2 on 05/10/11 at 19:01:09 5043070 wrote:
& I was afraid no one would come up with a really, really GOOD way to use it! |
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