Toolman62

Engine runs smooth as silk, thats why I want to do my own test and verify. My shop is next door to an engine shop and he was out when I was running it and said he couldn't hear any miss. Throttle response is as crisp as a whip, starts and idles at 600 rpm's, no backfiring, plugs look excelent, and no raw gas smell with captains call ON.

Toolman62

I found the fuel pump finally!!! I think if they tried a little harder they could have found a better place to put it. I may have to pull the engine if it ever needs replacing.

Toolman62

If I end up pulling this engine then is getting gone through from the top to the bottom so it will be ready for next season. What do you guys think about the Imco or the Dana Marine exhaust manifolds? The reason for asking is my port side is rusting thru

Griff

Its impossible to run 57mph at 3800rpms with a 23"prop and 1.5 ratio drive. Get a GPS speed and be ready to be severely disappointed.

Toolman62

I had a gps app on my phone and it matched the speed-o within 1 mph. The drive has no serial # on it and I haven't taken it apart to verify ratio, so I really don't know what ratio is in it. Plus I was running with my buddy beside me the whole weekend.

Griff

Then you need to verify your tach readings.

hullofjustis

if it is not running horrible at all other rpm ranges those leak down results are incorrect. you said the fuel pressure is low what is it reading??? i believe you have a bad high pressure fuel pump. also the imco or eddie are all good exhaust and much lighter.

Toolman62

I believe the techs computer was showing 35 psi but was holding at all rpm ranges. I feel it needs to be up in the 40's. That's why I was going to run it again with a pressure gauge on it to get a second reading. I'm also going to do my own leak down test before pulling the engine. Tach was also checked using the computer while running on the water and it was dead on (I was actually surprised how close it was).
The tech said it had a mechanical and an electric pump. I looked where a mechanical pump "should" be but I can't find one, just the electric.

nailit

Agree with Griff, your tachs off by 6-800 rpms on the low side. 3800 at 57 would be -3.3% slip. Using 11% would be running 4400ish. Note: 1.5 and 23p used in calc.

kidturbo

I'll "somewhat" agree, the drive is probably a 1.26 ratio.

Here is a screenshot of my radar verified GPS speed on a 1.26 XR , 37 pitch 5 blade, slipping 21%



Yours would be slipping 13% if that tach and my 1.26 calculations are correct.