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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Tachometer /cgi-bin/YaBB.pl?num=1172497541 Message started by glwharton on 02/22/07 at 17:39:11 |
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Title: Tachometer Post by glwharton on 02/22/07 at 17:39:11 Can anyone explaine to me how to hook up a tachometer on a Suzuki Savage S40 ? Thank you |
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Title: Re: Tachometer Post by Reelthing on 02/22/07 at 19:16:06 Maybe. what kind of tach do you have? generally you'll find a ground say near the horn and hook to the leads on the coil - power the light from there as well |
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Title: Re: Tachometer Post by grandpa on 02/25/07 at 13:33:54 Been wanting to ask the same question, but let me expand it a little. All I have is an automotive type tach/dwell meter. How do you convert from a 6 or 8 cylinder reading??? |
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Title: Re: Tachometer Post by Reelthing on 02/25/07 at 14:44:07 good question - I think a v8 fires 4 times per revolution and since the savage is a dual fire - fires every time the piston goes up - I'd say 4x of what the v8 setting shows |
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Title: Re: Tachometer Post by Greg_650 on 02/25/07 at 15:13:33 glwharton wrote:
By the tach directions you will connect it to the ignition coil under the tank. If it has a lamp you'll have 3 wires...Positive, Signal, and Ground. It's really simple once you remove the tank. You'll have enough gas in the carb to start it and test with the tank off. |
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Title: Re: Tachometer Post by Greg_650 on 02/25/07 at 15:19:00 Now, I'm lost. Are we talking a diagnostic tach or a permanent mounted one? :P |
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Title: Re: Tachometer Post by grandpa on 02/25/07 at 16:37:12 Diagnostic for now. After the rejet and muff I reset the idle by ear but would really like to know for sure. Took long enough to convince the missus I deserved a bike. Not wanting to push too much too soon. Plus I now have 359 house payments to go. Permanent mount is on the top of my list. Have always had one in my personal cars. |
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Title: Re: Tachometer Post by Greg_650 on 02/25/07 at 20:52:06 grandpa wrote:
OKAY then ;D |
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Title: Re: Tachometer Post by thumperclone on 02/26/07 at 07:27:58 i have an small ( i need my reading glasses to read it)inexpensive(under $40) digital tach from pit possee..1 wire wraps around plug wire 5-6 times, no back light,use it mainly for idle adjust, mounted to bracket that holds oil temp gauge on handle bar..works ok tho a lil slow on response..has non resetable run time meter also. |
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Title: Re: Tachometer Post by Savage_Rob on 02/26/07 at 09:40:15 thumperclone wrote:
I had one that sounds a bit larger from Northern Tool and Equipment that worked well but the vibration finally killed it. I think it was made for stuff like portable generators, pumps, etc. |
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Title: Re: Tachometer Post by thumperclone on 02/27/07 at 06:47:46 Savage_Rob wrote:
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Title: Re: Tachometer Post by Savage_Rob on 02/27/07 at 08:28:20 thumperclone wrote:
Sealed unit, non-replaceable. |
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Title: Re: Tachometer Post by Kropatchek on 02/27/07 at 08:44:47 I had the Northern Tool and Equipment on for year and a half. It sudenly died. Opened it up ( void the waranty if any) and fount the battery soldered and sealed in place. No repairs possible. Anyway, I also believe it is for lawnmowers or stationairy engines; the indication was slow to follow the throttle movement. Got one from Byron, quite satisfied with that, expensive though. And I like instruments/indicators with needles. http://img136.imageshack.us/img136/8623/tach2wh7.jpg |
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Title: Re: Tachometer good question - I think a v8 fires Post by Salad_Shaker on 02/27/07 at 12:53:21 Reelthing wrote: "good question - I think a v8 fires 4 times per revolution and since the savage is a dual fire - fires every time the piston goes up - I'd say 4x of what the v8 setting shows" Er, wouldn't that make the 'ole thumper a two-stroke? Is there something I've been missing all these years that makes the Savage engine different? |
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Title: Re: Tachometer Post by smokey02 on 02/27/07 at 13:21:49 It's a magnet triggered ignition, runs off flywheel magnet and p/u coil, so it fires every revolution (just like a 2 stroke) I think they call it 'wasted spark' |
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Title: Re: Tachometer Post by thumperclone on 02/27/07 at 14:01:50 im corn fused...i thought 4 stroke = 1 suck,2 compress,3 fire,4 exhaust... SO she fires every other time the piston comes up...? |
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Title: Re: Tachometer Post by smokey02 on 02/27/07 at 19:18:46 Yes, it's a 4 stroke, she fires every other time the piston comes up, BUT, the spark goes off EVERY time the piston comes up. It would be more expensive and complicated to run the ignition off the camshaft, (1/2 rpm of crank) much cheaper and simpler to run the ignition off the crank/flywheel, so every other spark is 'wasted'. One goes off at the top of the compression stroke, (squeeze) one goes off at the top of the exhaust stroke. (blow) |
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Title: Re: Tachometer Post by Salad_Shaker on 02/28/07 at 01:38:36 Let's see if I get this now. Def. a 4 stroke: suck-squeeze-bang-blow but has an extra spark on the fourth phase which is "wasted". Right so far? Does this wasted spark actually do anything at all? Is there any sort of afterburner effect on an unburned mixture in the exhaust gasses maybe upping the efficiency a shade and cleaning the emisions too? We should be told! |
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Title: Re: Tachometer Post by LANCER on 02/28/07 at 05:43:13 Quote: [We should be told!] ... Men in black suits come to your door in the dead of night and say one thing only ... "this is on a need to know basis, and you don't need to know", then they leave in the black suv they drove up in, and the black helicopter above your home slowly and silently moves back up into the black moonless night sky ... |
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Title: Re: Tachometer Post by smokey02 on 02/28/07 at 14:11:00 I believe that wasted spark goes off just after the exhaust valve closes and just before the intake valve opens, I don't think it has much effect on anything. ...but keep your eye out for black helecopters... |
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Title: Re: Tachometer Post by amcline on 03/01/07 at 09:27:24 mind if i chime in with a question, talking about it firing after the exuast valve closes, would that be the issue behind these bikes having way more backfire and after fire problems than many other bikes? sounds to me once the piston rises on exuat, if it fires to soon it would ignite any leftover fumes and there you go, what would the fix for this be? changing cam timing so the exuast closes sooner? or changing the ignition timing? and how do you do that if possible sorry my post dont have anything to do with a tach, but i would like to get a small one, seen them on ebay for about 30-40 bux. |
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Title: Re: Tachometer Post by smokey02 on 03/02/07 at 20:39:32 I'm guessing the exhaust valve would already be closed before the wasted spark went off. Isn't backfiring more related to the lean carb settings to meet EPA regulations? go to the Technical Documents/Reference and look at: "Mid-Range Power & the White Spacer (Backfire)" Getting back to Tachometer.....will a HD (or any V-twin) tach work on our LS650 ? It seems that kind of tach would be calibrated for 2 sparks every 2 revolutions, the same as our 1 spark every 1 revolution? |
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Title: Re: Tachometer Post by Reelthing on 03/03/07 at 05:38:23 most tachs for an hd will - some have an option for a single fire adapter, this you do not need |
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Title: Re: Tachometer Post by mpescatori on 03/07/07 at 06:27:28 Hi all, pardon me for this intrusion, but I would like to shed some light on this "wasted spark" issue. The so called "wasted spark" is a very cheap and popular solution for cutting emisisons without having to rehash the entire engine. 1st spark: during compression, as we all know; 2nd spark: during exhaust, ignites and helps burn any unburnt fuel, thus improving COx and NOx readings. The 2nd spark will occur before the exhaust valve closes, but before the intake valve opens |
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Title: Re: Tachometer Post by Kropatchek on 03/07/07 at 07:26:57 mpescatori wrote:
Sorry! From the SSM: Exhaust closes 14 degr. after TDC and inlet opens 22 degr. BEFORE TDC. That means BOTH are open during that periode. Ignition takes place 5 degr. before TDC at 2000 RPM and 30 degr. before TDC at 4000 RPM. |
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