MustangMike
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- Dec 30, 2015
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Usually when they say something will come between 2 and 8pm, you are lucky if it comes by 8 pm, but not today. At 2:00 while I was in the middle of working on my 046 the packages arrived.
So mostly I just kinda looked things over, but here are my first impressions:
I am not as impressed with the New West Big Bore kits as I was with the Cross ones that came with the 660. Maybe they will work out well and I will be surprised, but the first one I opened had a horrible lower transfer port. The upper edge is very jagged and thin as a knife blade. Will have to see if I can fix it w/o getting into the ring area.
Conversely, the combustion chambers look great. They are D shaped, and look remarkably like my Mahle D Jug.
The other concern I have with the Big Bore jugs (and I would appreciate comments from someone more knowledgeable than me on this) is the intake ports seem much higher than on my Mahle D Jug. They are over 1/8" higher than my Mahle D Jug, and that one opens (w/o base gasket) at 74.
Pipe in folks, am I right to be concerned about an intake opening a good amount above 74??? Isn't high 70s usually optimal???
If you want to see how this Big Bore Piston compares to OEM and Meteor 460 slugs, see my thread "Re Creating a Classic 046".
So then I checked out that standard jug that came with the saw. Not the same problems, but the lower transfers on that need some work also. However, based on measurements from the base, the port timing on the 440 jug seems remarkably similar to the port timing on my Mahle 046 D Jug. IMO, that is not a bad thing! I may have to give one of those jugs a try!
So mostly I just kinda looked things over, but here are my first impressions:
I am not as impressed with the New West Big Bore kits as I was with the Cross ones that came with the 660. Maybe they will work out well and I will be surprised, but the first one I opened had a horrible lower transfer port. The upper edge is very jagged and thin as a knife blade. Will have to see if I can fix it w/o getting into the ring area.
Conversely, the combustion chambers look great. They are D shaped, and look remarkably like my Mahle D Jug.
The other concern I have with the Big Bore jugs (and I would appreciate comments from someone more knowledgeable than me on this) is the intake ports seem much higher than on my Mahle D Jug. They are over 1/8" higher than my Mahle D Jug, and that one opens (w/o base gasket) at 74.
Pipe in folks, am I right to be concerned about an intake opening a good amount above 74??? Isn't high 70s usually optimal???
If you want to see how this Big Bore Piston compares to OEM and Meteor 460 slugs, see my thread "Re Creating a Classic 046".
So then I checked out that standard jug that came with the saw. Not the same problems, but the lower transfers on that need some work also. However, based on measurements from the base, the port timing on the 440 jug seems remarkably similar to the port timing on my Mahle 046 D Jug. IMO, that is not a bad thing! I may have to give one of those jugs a try!