Transom Height for 55H

[ddalton]

yikes!!! 20 ce

good thing your not talking about my transom

[dg22]

Hey Dave S, thanks for the tips on the transom. I'm really looking forward to get it out on the water. It's been hanging from the ceiling of my garage for 2 years now. I can't believe I almost have a complete race motor. I'd really appreciate the help to get her setup right. When I was a kid, we use to race around the lake all summer with our 8 and 10 foot hyro's with Merc 25's with chopper props but none of us had a real race motor. Looking forward to break the 50 mph mark .

[ram95]

Just curious

What's the difference between, say a regular M500 44 inch block (1987 variety) and a 44XS block? And, on a test wheel (55h type), what rpm should one expect a 44xs to turn? What's max spark advance? How about jet size (sea level operation). Are the 44xs flywheels different? Yeah.... I hear all you guys out there laughing. Trade secrets all!!

[crankbearing]

??? questions

What's the difference between, say a regular M500 44 inch block (1987 variety) and a 44XS block? And, on a test wheel (55h type), what rpm should one expect a 44xs to turn? What's max spark advance? How about jet size (sea level operation). Are the 44xs flywheels different? Yeah.... I hear all you guys out there laughing. Trade secrets all!!

Hey,

There should be no differences between a 1987 500 block and a 44xs block except paint. The 44Xs blocks were unpainted and depending on your serial group of the 500, you should have two bosses on the crankcase to the right of the lower carb opening to mount a square style fuel pump, if not you have to drill the crankcase for a pulse line and mount the fuel pump elsewhere. I have trick for this if you are not running electric start. On a test wheel you should never see max rpm for any length of time. 8500 is not uncommon if your taking the throttle up quickly and then off with the test wheel, I do not recommend.. this start it on the test wheel make sure you have water and burst it a couple times to clear it out. I have never had mine over 1/2 throttle on the test wheel, secondly most test wheel hubs will give out before long at sustained high rpm testing.

The jet sizes in a 44XS on the east cost mainly .055, but some run .053. and timing is max 33 degrees at 6500 RPM. Under load you should be seeing 6900 - 7200 rpm for competiton racing. I set mine up on our Dyno through a 50 HP fishing lower unit that is 2:1 gear ratio. It is a K&O model 2000.

A trick to the timing is to remove the rubber stop on the max spark screw and the exposed threads should measure roughly 3/4" that will be in the area of 33 degrees.

Hope that helps.

Regards,