SuzukiSavage.com - tachometer

rl153 Serious Thumper Offline S40 Just right! Posts: 906 Bloomfield,CT Gender:	tachometer 04/05/12 at 10:39:40 I'm am trying to set my tachometer, should I set it for ,spark plug fires twice per revolution, or once per revolution,Thanks!
Back to top	IP Logged

Oldfeller--FSO Serious Thumper ModSquad Offline Hobby is now "concentrated neuropany" Posts: 12670 Fayetteville, NC Gender:	Re: tachometer Reply #1 - 04/05/12 at 10:43:44 Our spark plug fires twice per cycle, once at TDC compression stroke and once at TDC exhaust stroke. The plug fires at Top Dead Center, whenever that occurs.
Back to top	Former Savage Owner IP Logged

rl153 Serious Thumper Offline S40 Just right! Posts: 906 Bloomfield,CT Gender:	Re: tachometer Reply #2 - 04/05/12 at 10:49:18 You're saying twice per revolution,right? I think that answers my question ,Thanks!
Back to top	IP Logged

Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28633 Tucson Az Gender:	Re: tachometer Reply #3 - 04/05/12 at 10:59:16 Twice per cycle,.. but once per revolution.... That's what was stopping me from replying... Are they really asking per revolution, or per cycle?... ...IDK?...
Back to top	Ludicrous Speed !... ... ... IP Logged

rl153 Serious Thumper Offline S40 Just right! Posts: 906 Bloomfield,CT Gender:	Re: tachometer Reply #4 - 04/05/12 at 11:01:47 In the instructions it says per revolution, as in rpm.
Back to top	IP Logged

justin_o_guy2

Serious Thumper

Offline

What happened?

Posts: 55279
East Texas, 1/2 dallas/la.

Re: tachometer
Reply #5 - 04/05/12 at 11:21:22

Being as its a 4 stroke engine,, it fires twice per cycle, one cycle being all 4 strokes. TDC, always sparks it.. Its cheaper & easier to do it that way. Building it so that it only fires TDC compression would be a pain,

How do they do it on multi cylinder engines? A twin could fire tdc comp & ex, as long as the pistons ran in synch, but what happens when ya have 3?

Back to top

The people never give up their liberties but under some delusion.- Edmund Burke.

IP Logged

Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28633 Tucson Az Gender:	Re: tachometer Reply #6 - 04/05/12 at 11:53:07 justin_o_guy2 wrote on 04/05/12 at 11:21:22: How do they do it on multi cylinder engines? A twin could fire tdc comp & ex, as long as the pistons ran in synch, but what happens when ya have 3? Spaz-fire... ...
Back to top	Ludicrous Speed !... ... ... IP Logged

rl153 Serious Thumper Offline S40 Just right! Posts: 906 Bloomfield,CT Gender:	Re: tachometer Reply #7 - 04/05/12 at 14:20:56 You guys are saying the plug fires once per revolution, but there are two revolutions per cycle. I think I have to set it at once per revolution. Thanks!
Back to top	IP Logged

arteacher Serious Thumper Offline Ride as if your naked and invisable! Posts: 2581 London ontario Gender:	Re: tachometer Reply #8 - 04/05/12 at 15:46:00 I think these guys confused you, bless their hearts. Set it for twice per revolution. If the spark was firing twice every time the crank turned once it wouldn't make any sense.
Back to top	white '07, Raask exh, Corbin seat, slipstreamer shie, Raptor, Routy's fwd controls, Baron tach, Frisco bars, Isogrips, Headlight and taillight modulators, Dial-a- jet, AME 9 deg chop kit, K&N air flt IP Logged

justin_o_guy2

Serious Thumper

Offline

What happened?

Posts: 55279
East Texas, 1/2 dallas/la.

Re: tachometer
Reply #9 - 04/05/12 at 15:55:58

arteacher wrote on 04/05/12 at 15:46:00:

I think these guys confused you, bless their hearts. Wink

Set it for twice per revolution. If the spark was firing twice every time the crank turned once it wouldn't make any sense.

Im just glad you showed UP! Wow,, Its certainly clear now! LMAO..

It fires every time the piston goes up, it does that once every time the crank makes 360 degrees, which is one revolution,

Back to top

The people never give up their liberties but under some delusion.- Edmund Burke.

IP Logged

thumperclone Serious Thumper Alliance Member Offline PGR rider riding with respect Posts: 6044 Grand Junction Colorado Gender:	Re: tachometer Reply #10 - 04/05/12 at 22:57:50 1 rpm = 1rpm and i did terrible in math wheres the spelling chek icon?
Back to top	standing for those who stood for US IP Logged

Routy Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2280 Winston Oregon Gender:	Re: tachometer Reply #11 - 04/07/12 at 06:24:43 Quote: Building it so that it only fires TDC compression would be a pain, -------------------------------------------------------------- Not if they fired it off the camshaft instead of the crank,........like they used to do.
Back to top	Rich '07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055) IP Logged

Routy Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 2280 Winston Oregon Gender:	Re: tachometer Reply #12 - 04/07/12 at 06:29:43 But curious,....w/ all the valuable info in this thread, did ya ever get it reading correctly ? What Tach did you use ? I'd like one that fits in the std 2 1/8 hole. Seems like I found one long time ago, but it wouldn't work on a single cyl that fires every revolution.
Back to top	Rich '07 S40 Blvd stocker, except drilled OEM exhaust and white spacer mod...1/2 (.055) IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: tachometer Reply #13 - 04/07/12 at 08:04:50 Routy wrote on 04/07/12 at 06:24:43: Quote: Building it so that it only fires TDC compression would be a pain, -------------------------------------------------------------- Not if they fired it off the camshaft instead of the crank,........like they used to do. When the cam is down in the crankcase, thats not such a big deal.
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

Theseus YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 17 Cary, NC Gender:	Re: tachometer Reply #14 - 04/12/12 at 07:16:53 There was thread recently(ish) where people were providing links to tachs they had used successfully, but now I can't seem to find it.
Back to top	IP Logged