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Message started by daltmyer920 on 05/22/14 at 21:34:47

Title: Idle speed guesstimate
Post by daltmyer920 on 05/22/14 at 21:34:47

Wanted to load a quick video. If anyone could let me know if idle speed seems alright? I personally think may be a tad on the slow side I can email the video to someone but won't let me load the video. So PM if u can help me out. Thanks

Title: Re: Idle speed guesstimate
Post by justin_o_guy2 on 05/22/14 at 22:42:22

If you think its a bit slow, jack it up a little,.,Low idle rpm = low oil pressure = accelerated wear on the cam bearings, which arent insert bearings. Theyre line bored holes that are 1/2 in the head & 1/2 in the head cover. Ya dont wanna starve that for oil.. Until you KNOW what the idle RPM is, youre way ahead spending a buck on gas because its a little higher than needed. If you can get on a flat parking lot & get rolling in first gear & let it drop to an idle, it should be making about 10 MPH. Wait till its all warmed up, Someone who knows the Ge3ars/RPM/speeds may correct me on this.

Title: Re: Idle speed guesstimate
Post by jcstokes on 05/22/14 at 22:47:54

It possibly should go popapopapopa at idle rather than thuump thuump thuump. But I'm not a techie or expert.

Title: Re: Idle speed guesstimate
Post by justin_o_guy2 on 05/22/14 at 22:58:21

JC,, NO Kiddin youre no techie OR expert,, EVERYbody knows its

popadapopadapopada
not
popapopapopa

You left out the exhaust stroke man,,this aint no twice cycle..

You tryin to mess the guy up?

Title: Re: Idle speed guesstimate
Post by jcstokes on 05/23/14 at 01:49:38

Thank you JOG2, now he knows the right noise.

Title: Re: Idle speed guesstimate
Post by doctorpc on 05/23/14 at 04:17:13

I have a tach on my S40 and i know my idle is about 1250rpm i was told that was about right to keep it above 1000rpm

Title: Re: Idle speed guesstimate
Post by curmudgeon on 05/23/14 at 06:24:13

I don't have a tach, but as far as determining rpm by ear, I approach the problem logically:

It's a 4 stroke engine with 1 cylinder, therefore I should hear 1 exhaust pulse every 2 rpm. If I wanted an 1100 rpm idle, I should hear ~550 exhaust pulses each minute.

The fastest youtube metronome I could find is 500 bpm, so just make your idle sound a little faster than this and you should be good: https://www.youtube.com/watch?v=QImRxzVz3hg

Title: Re: Idle speed guesstimate
Post by thumperclone on 05/23/14 at 10:38:08

check the tech section there was a sound clip at one time

"quick audio tach"