On going issue on new engines, they both start and run smoothly, where the issue seems to be is timing (lack of ) and fuel consumption between the 2 engines. My starboard engine (counter rotating) seems to use a lot more fuel then port. The port engine maybe at 2400 rpm's and about half throttle, to get the starboard at that rpm its more like 3/4 throttle. I checked the timing of the port motor using a digital advancing light and set rpms to 2000 and then checked timing, it was 25.9 degrees, idled back to 800 and I was looking at 6 degrees initial. I set the starboard engine to as close to that, and it doesn't "sound" right. The startup seems weak, the starter turns its over very quick, just not that quick fire up. I ran the engines about 4 hours yesterday, seemed to run well, the throttles positions levers were still off, so it made running at speed tougher to move in unison.
Before changing the timing on the starboard engine, I had located TDC ( as best as I could, have tool from Summitt on order) and marked the balancer. After looking at different balancer types, it appears I have a balancer marked for vertical timing tab ( chevy used 3 types vertical, 2:00 o'clock and 2:30 o'clock positions) So my timing is definitely off, would this cause a higher fuel consumption? I had not made any changes to the port motor and that has been fine. The starboard got changed when the engine was installed the dizzy had to be removed.
I'm going down to the boat tonight, and will take pictures of the balancer and timing marks. The timing light I used is all digital, you can read rpms on the display and then switch to timing and step thru by 10ths of a degree. Once the tool arrives to check tdc, I'll remark the balancer with timing tapes.
The motors are both the same specs http://cgi.ebay.com/ebaymotors/2-NEW-GM-350-5-7-L-MARINE-ENGINES-MERCRUISER-CRUSADER-_W0QQcmdZViewItemQQhashZitem35b3cde675QQitemZ230649882229QQptZBoatQ5fPartsQ5fAccessoriesQ5fGear#ht_1892wt_1165
This is what I have, bought last year in September, took me this long to get the boat ready.
Before changing the timing on the starboard engine, I had located TDC ( as best as I could, have tool from Summitt on order) and marked the balancer. After looking at different balancer types, it appears I have a balancer marked for vertical timing tab ( chevy used 3 types vertical, 2:00 o'clock and 2:30 o'clock positions) So my timing is definitely off, would this cause a higher fuel consumption? I had not made any changes to the port motor and that has been fine. The starboard got changed when the engine was installed the dizzy had to be removed.
I'm going down to the boat tonight, and will take pictures of the balancer and timing marks. The timing light I used is all digital, you can read rpms on the display and then switch to timing and step thru by 10ths of a degree. Once the tool arrives to check tdc, I'll remark the balancer with timing tapes.
The motors are both the same specs http://cgi.ebay.com/ebaymotors/2-NEW-GM-350-5-7-L-MARINE-ENGINES-MERCRUISER-CRUSADER-_W0QQcmdZViewItemQQhashZitem35b3cde675QQitemZ230649882229QQptZBoatQ5fPartsQ5fAccessoriesQ5fGear#ht_1892wt_1165
This is what I have, bought last year in September, took me this long to get the boat ready.