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 Engines, Electric, Plumbing, etc.
 RPM's and Sync Meter not in "sync"
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Author Previous Topic: Low Compression in #1 Cylinder? Topic Next Topic: Volvo Penta 5.8 FSi Stumble Cruise Issue  

dwarren

RO# 14233

Posted - May 28 2019 :  10:05:44  Show Profile  Reply with Quote
Odd run home. 1984 Crusader 350's (454's). Starboard side had new delco installed two years ago and starboard was timed up and verified. Both motors are pretty strong. Running home yesterday, using the old red light/green light sync meter, could not get the rpms to match. Seems like I had to run my port side at 400 RPM's higher (almost full throttle) to get the light to go green. When I run the RPM's close together, seems like it sounds right.

Bottom line, does anyone know of a quick replacement meter I can use so I can isolate?
Douglas Warren
"You never get sumthin' for nuthin'"

Homeport: ny

Kellyg

RO# 19800

Posted - May 28 2019 :  14:45:05  Show Profile  Reply with Quote
Get yourself a photo-tach.
Cheap and extremely accurate.


Gary
Mt. Sinai, NY
2001 Regal 3780
2002 Striper 2101DC

Smooth seas never made a skillful mariner.

Homeport: Patchogue,NY Go to Top of Page

Sandy

RO# 1159

Posted - May 28 2019 :  16:07:57  Show Profile  Reply with Quote
Who made your passive synch indicator? Does it by any chance have a sync adjustment setting on the back?

I've found this Innova digital dwell/tach/inductive advance timing light very handy for use on older engines"
https://qualityproduces.com/shop/innova-5568-pro-timing-light-with-tool-case/?adTribesID=6e1c9e3c87ddaa4b5c495e26b0717c48%7Cadtribes%7C189100&utm_source=Google%20Shopping&utm_campaign=walmart&utm_medium=cpc&utm_term=189100

But Kellyg's digital photo tach is cheaper for just rpm.
Or.... maybe something like this magnetic pickup tach for testing?:
https://www.amazon.com/DIGITEN-Digital-Tachometer-Proximity-Switch/dp/B00VKAT8A2/ref=asc_df_B00VKAT8A2/?tag=hyprod-20&linkCode=df0&hvadid=312050280935&hvpos=1o5&hvnetw=g&hvrand=8274181505923911118&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9002103&hvtargid=pla-569951226433&psc=1&tag=&ref=&adgrpid=61716360643&hvpone=&hvptwo=&hvadid=312050280935&hvpos=1o5&hvnetw=g&hvrand=8274181505923911118&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9002103&hvtargid=pla-569951226433

Trust your ear for least out-of-sync exhaust resonance more than the dash gauges. But confirm the ignition parts are in good shape performing as they should.


Sandy

Homeport: The Vineyard Go to Top of Page

dwarren

RO# 14233

Posted - May 31 2019 :  12:54:21  Show Profile  Reply with Quote
quote:
Originally posted by Sandy

Who made your passive synch indicator? Does it by any chance have a sync adjustment setting on the back?

I've found this Innova digital dwell/tach/inductive advance timing light very handy for use on older engines"
https://qualityproduces.com/shop/innova-5568-pro-timing-light-with-tool-case/?adTribesID=6e1c9e3c87ddaa4b5c495e26b0717c48%7Cadtribes%7C189100&utm_source=Google%20Shopping&utm_campaign=walmart&utm_medium=cpc&utm_term=189100

But Kellyg's digital photo tach is cheaper for just rpm.
Or.... maybe something like this magnetic pickup tach for testing?:
https://www.amazon.com/DIGITEN-Digital-Tachometer-Proximity-Switch/dp/B00VKAT8A2/ref=asc_df_B00VKAT8A2/?tag=hyprod-20&linkCode=df0&hvadid=312050280935&hvpos=1o5&hvnetw=g&hvrand=8274181505923911118&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9002103&hvtargid=pla-569951226433&psc=1&tag=&ref=&adgrpid=61716360643&hvpone=&hvptwo=&hvadid=312050280935&hvpos=1o5&hvnetw=g&hvrand=8274181505923911118&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9002103&hvtargid=pla-569951226433

Trust your ear for least out-of-sync exhaust resonance more than the dash gauges. But confirm the ignition parts are in good shape performing as they should.


Thanks I'll check that out. I'm pretty sure both motors are timed up perfect. Had it done professionally tail end of 17. One motor had all new delco put in. I'm planning on doing the other this year.


Douglas Warren
"You never get sumthin' for nuthin'"

Homeport: ny Go to Top of Page

TJM

RO# 2909

Posted - Jun 06 2019 :  17:14:14  Show Profile  Reply with Quote
All 4 of my analog RPM gages needed to be adjusted to a photo tachometer. They have an adjustment screw in the back.

Tom
41' President

Homeport: Essex, Ct Go to Top of Page
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