Retarding timing to gain wot rpms

[Abomb27]

Re: Retarding timing to gain wot rpms

I appreciate you answering my post but it's apparent that you want to get into a pissing contest and I would like to pass on that. Im only looking for advice or constructive opinions nothing else.

 

[boobie]

Re: Retarding timing to gain wot rpms

Abomb, is the gate on the back of drive fully opening up ??

 

[metriccrescentwrench]

Re: Retarding timing to gain wot rpms

Wow.

You are saying that your timing range from near-static to WOT should be ~ a net of 2-4 degrees.
As a disclaimer, I am not sure what power plant is in that rig, so I am not type-familiar, but those numbers make no sense whatsoever.

Tim, I'm certain that what we're talking about here is setting WOT timing while cranking with the starter, like what Joe Reeves has described.

As far as changing timing to gain performance, I'd be real hesitant to do anything other than what the factory specs call for. Especially if you want the engine to live a long healthy life.

 

[Tim Frank]

Re: Retarding timing to gain wot rpms

Tim, I'm certain that what we're talking about here is setting WOT timing while cranking with the starter, like what Joe Reeves has described.

I'm not assuming that....that's why I asked.

Can you describe the process that you used to set the timing to 26 degrees?

OP doesn't seem prepared to respond to that. That's why I suggested a manual.

 

[Abomb27]

Re: Retarding timing to gain wot rpms

Thanks metriccrescentwrench that's exactly what I did. I didn't think it was that hard to get. As far as a manual if you read all the posts you would know that I have one. Tim Frank I don't believe you want to be helpful I think you want to challenge people's opinions. Thank you boobie I never thought of that I will check it tonight and post back. That's why I like this forum.

 

[Abomb27]

Re: Retarding timing to gain wot rpms

Thanks as far as timing that's what I ess getting at can you add performance by changing it or is it best left alone.

 

[Abomb27]

Re: Retarding timing to gain wot rpms

While we are talking about timing, when I adjust the pick up timing, it is with the throttle cable off, and the embossed mark on the cam barely touching the cam follower (if I used the correct words). I don't see alot of adjustment when I rotate the adjuster, and the motor won't run without the butterflies open a little.

 

[Abomb27]

Re: Retarding timing to gain wot rpms

The only reason im checking everything is because the guy before me was such a hack, didn't take care of anything. He used a bolt as a fuse. I want everything to be perfect. I know I'm spending more time and money then it's worth, but I really like this boat.

 

[metriccrescentwrench]

Re: Retarding timing to gain wot rpms

and the motor won't run without the butterflies open a little.

These 2 stroke outboards are designed to idle with the butterflies closed all the way. They (all the ones I've seen anyway) have a small hole in the butterfly that's sized to let just the right amount of air through at idle. Idle speed is adjusted by varying idle spark timing. This entire process of setting the idle timing, synchronizing the carbs, etc. etc. etc. is referred to as link-and-synch. You didn't mention if you have an OMC manual or one of the knock-offs, in my experience the knock-off manuals don't do as good a job as the factory manual at walking you through the link-and-synch procedure.

 

[Abomb27]

Re: Retarding timing to gain wot rpms

I have the original OMC manual I bought on eBay. I went through the whole link and sync procedure, it was fairly straight forward till I got to the pickup timing. So the motor should run with butterflies closed and only adjusting the timing. At the point where it is idling smooth check timing for 5? +/- and it should be just at the point where it is going to start opening the butterflies? Making adjustments to the pickup timing is done with the throttle cable off?

 

[Faztbullet]

Re: Retarding timing to gain wot rpms

When the throttle plate are fully shut you are idling on jetting and timing, also yuor correct about timing advancing with rpm. You should be able to dial your in really close with a jet pump as you can back it in just enough to load pump and run near WOT rpm and set timing...

 

[Abomb27]

Re: Retarding timing to gain wot rpms

Thanks faztbullet I am gonna back it in at the ramp and get the timing to factory specs. It pretty safe to say that everyone is saying to get it to factory setting and leave it alone. Thanks everyone for your time and great advice. I will post back after I get it checked out.

 

[Tim Frank]

Re: Retarding timing to gain wot rpms

I appreciate you answering my post but it's apparent that you want to get into a pissing contest and I would like to pass on that. Im only looking for advice or constructive opinions nothing else.

You are entitled to your opinion, and I am sorry if you feel that anything I said was confrontational.
If I think have anything to contribute to one of these problems, I will weigh in, but I will confess that it can be a bit irritating when someone who comes in here looking for assistance ignores questions that might help widen the search for the problem, and then dumps on someone who is legitimately trying to help.

You have to keep in mind that you are the only one who has first-hand access to the problem...and symptoms.
We have to try and assess anything based on your info, and try to sense your level of competence....and do it in in typeable bits.

And with all due respect, the following two statements from you are contradictory, and that is why I questioned your understanding of ignition timing....which may be why you took offense.

You can not set the timing to exactly 28? while cranking the motor because it is not the same as the motor running at wot. It should be 2-4 degrees less. Then checked on the water with a load on the motor. So 26? at cranking speed should translate to 28? on the water with a load on the motor.

From what I understand and I could be wrong but timing retards a little naturally at wot. Thanks for all the replies.

It would still, IMO, be worth your time to weigh the whole rig and compare it to OEM spec.

 

[Abomb27]

Re: Retarding timing to gain wot rpms

Thank you Tim, I agree it is hard when you physically can't see the motor, and are waiting for responses that may not answer your questions. I appreciate the help and I will get it weighed to rule out a water logged hull. The more things I rule out the closer I come to identify the problem. And I also apologize for misjudgment of your intentions.

 

[Abomb27]

Re: Retarding timing to gain wot rpms

One more thing that maybe someone is familiar with. When I start moving the throttle forward the timing advances with the throttle till it hits it set point (28?) but my throttle stills moves a little more with the timing staying the same. Is that normal?

 

[clanton]

Re: Retarding timing to gain wot rpms

Normal And the timing advances as RPMs increase to rated RPMs

 

[Abomb27]

Re: Retarding timing to gain wot rpms

Thanks Clanton, the whole set up feels like it's too shaky to be right. I can wiggle the cam, and everything is bolted right. Is that normal also?

 

[Abomb27]

Re: Retarding timing to gain wot rpms

im pretty clear about the timing and what I need to do and the importance of not messing with the factory specs. the part I'm not clear on is that I advance the pickup timing with the butterflies closed to get it to idle. Now my OMC manual says pickup timing is 6?+/-1?, it also says that idle speed is 1,100 rpms is it possible to have both? I think my idle speed would be more important but I don't know. Really trying to get the whole picture in my head.

 

[Tim Frank]

Re: Retarding timing to gain wot rpms

http://forums.iboats.com/mercruiser...ives/list-possible-causes-low-wot-295070.html

Additional input from a Guru.

 

[Abomb27]

Re: Retarding timing to gain wot rpms

Thanks Tim I am going to go through that whole list.