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General Category >> Rubber Side Down! >> TDC: Exhaust vs Compression Stroke
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Message started by vroom1776 on 06/29/06 at 08:39:31

Title: TDC: Exhaust vs Compression Stroke
Post by vroom1776 on 06/29/06 at 08:39:31

Hey gang,

So finding TDC is realtively easy. Now the question is, "How do I tell when it's on the exhaust or compression stroke?"

Which set of valves do I need to watch for which motion?

& to be sure:

"When I adjust my valves, do I do it on the exhaust or compression stroke?" Another thread says the compression stroke, but I don't want to do it a 3rd time (yet).

Oh, and any of you experts who feel like going on a rant, please feel free to do so. Especailly if you want to tell us about V-twins, too.

Thanks,

V, the knucklehead w/ chattering valves ;)

Title: Re: TDC: Exhaust vs Compression Stroke
Post by Reelthing on 06/29/06 at 09:25:43

My sideways v-twin has hydraulic lifters nana

adjust the savage at TDCC - you could watch the intake valves close and keep turning the engine until your at tdc if you need to

Title: Re: TDC: Exhaust vs Compression Stroke
Post by vroom1776 on 06/29/06 at 10:24:29

RT,

Sorry for my ignorance, but wathcing the intake valves close will then set me to the compression cycle, correct? Which is where I should adjust my valves, correct?

Let me think... the piston goes down after the exhasut stroke (and the exhaust valves close). This draws in fuel and air from the carb while the intake valves are open. For the compression, both sets of valves should be closed. The piston comes back up. Spark. Compression. When the piston starts coming up again, the exhaust valves open. restart cycle. Seems right... ?

Title: Re: TDC: Exhaust vs Compression Stroke
Post by vroom1776 on 06/29/06 at 10:27:23

http://keveney.com/img/otto.gif

Title: Re: TDC: Exhaust vs Compression Stroke
Post by Reelthing on 06/29/06 at 13:48:53

you bet - and there's a fair amount of time both set of valves are closed so a bit before tdcc would work well -

Title: Re: TDC: Exhaust vs Compression Stroke
Post by vroom1776 on 06/29/06 at 13:56:10

Thanks RT!

I will try and get some pics of the whole darn thing and make a tech sect article for valve adjustment.

Title: Re: TDC: Exhaust vs Compression Stroke
Post by Savage_Rob on 06/30/06 at 05:36:28

In my opinion, I wouldn't bother reinventing the wheel since the information at DAN'S ONLINE MOTORCYCLE REPAIR COURSE (http://www.dansmc.com/MC_repaircourse.htm), though not tailored specifically to the Savage/S40, is pretty complete already. Finding TDCC on the Savage/S40 could be a good thing to post though.

Title: Re: TDC: Exhaust vs Compression Stroke
Post by vroom1776 on 06/30/06 at 08:55:53

Yeah, been over there. I didn't see anything about doing it on the compression stroke, though. I don't mind doing it. A lot of the folks around here, me included, only have a fuzzy idea about what we are doing. Many non-experienced shade tree mechanics are a bit nervous to do much besides changing the oil, or maybe playing w/ the carb... and would like step by step instructions... with photos...

Title: Re: TDC: Exhaust vs Compression Stroke
Post by PerrydaSavage on 06/30/06 at 09:01:53

I'm one of "those" vroom ... any detailed essay (w photos!) of valve adjust procedure for the LS650 would be a greatly appreciated asset for all to use, enjoy ... and aleviate wrenching fears!
Thanks!

Title: Re: TDC: Exhaust vs Compression Stroke
Post by vroom1776 on 06/30/06 at 09:07:04

Perry,

I didnt know you liked photos... ;)

I should be able to get them up by monday... maybe.

V

Title: Re: TDC: Exhaust vs Compression Stroke
Post by Savage_Rob on 06/30/06 at 12:22:05

Sounds like a step-by-step would be appreciated then.