Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Tach/rpm issue
Okay, this confuses me so I may not be able to relate it in a non-confusing
manner. Twin engine 5.7l alphas, starboard tach is new and a different model than the port tach (which is OEM, 14 years old). Here's the deal. When I have the engines synched up according to the synch gauge the starboard tach shows about 200-250 rpm less. The starboard control is also "behind" the port control, indicating less throttle. If I balance the tachs, ignoring the synch gauge, I can't "hear" any better or worse synch in the engines -- as you may recall I'm a new boater. However the controls are more closely aligned. But by sound or feel alone I can't tell if the synch gauge is out or the tachs. During acceleration or decelleration sometimes I get them way out of synch and I've never noticed any vibration or anything that you guys have mentioned about out of synch engines other than hearing an rpm difference. I don't think I have enough experience to hear it down to a few hundred RPM though. This weekend I ran at WOT for a few minutes. I had the port throttle all the way open but the starboard one still had some room to move - a fair amount actually. I didn't move it all the way open because I was already reading well out of synch and didn't want to booger anything up. I believe I have some separate problems here so I'll lay out what I would "like" to happen. 1) Quite simply, I would like my tachs to tell me what actual RPM my engines are spinning. I learned from a previous post that there is a "time reference" issue involved with tachs and perhaps some other voodoo but let me say this about that, I just want to know *accurately* what the friggin' RPM is. Am I asking too much here? Is it not possible to get an accurate RPM reading? 2) If I can do #1, then I can easily figure out if my synch gauge is boogered. 3) This is the separate part I think -- is it normal to still have some travel left on one control while the other is wide open? Thanks in advance for any insights you may be able to provide. |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Ocean Spirit September issue now available | General | |||
Just How Safe Do You Feel? | General |