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Thread: Looks too loose to me ..
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09-16-2017, 10:45 AM #1
Looks too loose to me ..
I think the center hole has a problem ...
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09-16-2017, 10:50 AM #2
Loose is fast right?
Looks like it is getting a little more use than the others as well...I CAN ALWAYS MAKE ANOTHER DOLLAR, BUT I CANNOT MAKE ANOTHER DAY
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09-16-2017, 10:57 AM #3
Maybe I can fix it ....
https://i.imgur.com/LiObFIk.mp4
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09-16-2017, 11:14 AM #4
One of the easier remedies for you I guess...
I CAN ALWAYS MAKE ANOTHER DOLLAR, BUT I CANNOT MAKE ANOTHER DAY
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09-16-2017, 11:22 AM #5
Im sure you have a tighter fitting slug for that bore
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09-16-2017, 09:08 PM #6
That link is a short video . I haven't got a handle on a good place ( besides slow loading you tube ) to load vids .
Link : https://i.imgur.com/LiObFIk.mp4
Besides the torque from the increase in displacement . The port window's get much wider even when sticking with Mercs conservative port width / bore ratio ..
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09-16-2017, 11:09 PM #7
Bore/port width ratio reasoning?
I CAN ALWAYS MAKE ANOTHER DOLLAR, BUT I CANNOT MAKE ANOTHER DAY
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09-17-2017, 08:48 AM #8
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09-17-2017, 09:56 AM #9Supporting Member
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09-17-2017, 11:12 AM #10
For any kind of ring life 70% of bore diameter is considered the end of the road .
A stock 300x works off of a 64% ratio @ 2.330"
To bore one of these out "bigly" would bring the port width ratio down to 60% which would leave a lot on the table .
It's been pretty much relized that the most critical width area is in the first 30* of the ex ports opening .. that's why you will see people going to an Opti - elliptical window , which is easier on the rings and skirt life .
Anyway ..
Going out to 2.500 brings you back in line @ 64%
And even going to 2.600 brings you in @ 67%
As a side benefit , having a lot of meat that needs to be cleared out of the port , lets you contour the radius to ones own liking ... well OK , more twords what the windmill liked ..
Nice Pair :
3.999999 liter ???
Chaz = thinking , after taking a quarter inch of material out of each hole ... Pppffftttt these things can go out another eigth inch ... easy ...
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MeCapnDave thanked for this postCapt.Insane-o, JrCRXHF liked this post
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09-17-2017, 12:18 PM #11
All these years us rude boys have been trying to turn them into mercs now u merc nuts are trying to turn them into rudes..Looks nice but need some omc tractor rods in there lol...
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09-17-2017, 12:46 PM #12
Good that you caught the intruder piston before you put the head on.
Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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09-17-2017, 03:52 PM #13
OK Chaz, thanks for taking the time to explain it. Again, I was over complicating things by thinking bore size/port velocity interaction. The 30* fact or initial port exposure always did seem to me the most critical time to get things headed in the right direction though.
I CAN ALWAYS MAKE ANOTHER DOLLAR, BUT I CANNOT MAKE ANOTHER DAY
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09-17-2017, 10:54 PM #14
I don't know nuffin boutz where dem pissons had be .. Jus like Liberty City , I din-do-nuffin ..
I would had use a tracker rod .. but I cooden fine a shorty skroke crank to fit my blok ..
Markus
Good that you caught the intruder piston before you put the head on.
Some time later , I take "my" head to the "use ta be" my CNC guy and say run me a set , but with the Merc bolt pattern ... Wait , I gotta get permission from the OMC guy first ....
LOL .. so I guess you could say , I gotz OMC / BuRP heads too ...
AZMIDLYFOK Chaz, thanks for taking the time to explain it. Again, I was over complicating things by thinking bore size/port velocity interaction. The 30* fact or initial port exposure always did seem to me the most critical time to get things headed in the right direction though.
That one was easy . I wish I could claim it , just another step in two stroke evolution . Shame that most of the world has given up on them , no telling where they would be by now ...
300x on the left .... 300xs on the right ...
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MeCapnDave liked this post
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09-18-2017, 12:28 AM #15
Both stock sleeves? If so..wow that is a startling difference. Aside from the obvious size difference and the naked eye observation, is the X exhaust port opening sooner and closing sooner than the XS?
I CAN ALWAYS MAKE ANOTHER DOLLAR, BUT I CANNOT MAKE ANOTHER DAY
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