346XP Buildoff Saw

blsnelling

Slower than stock porting specialist
Jan 10, 2012
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166
43
I decided to mess around with my 346XP today. This is the OEM topend that has been on this saw since new. It is already ported, and wearing a 357XP carb. I have an AM topend that I'm going to try some new numbers in and see how it compares to what I already have here. If I like the results, I'll put those numbers in this topend. So, this is the baseline moving forward.

It's wearing a 20" .325 B&C w/7-pin rim. The wood is Walnut. The cut times are nearly identical between normal and heavy loads.

[video=youtube_share;kKOhB04bDQg]http://youtu.be/kKOhB04bDQg[/video]
 
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WoodChuck'r

HNIC
Staff member
Jan 8, 2012
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I was hoping to have one done up by now but things have been pretty nuts since my dad passed away in December. Lotta priorities have changed - gotta take care of mom!


I'm sure I'll be at Jeremy's GTG though.... :thumbsup:
 
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blsnelling

Slower than stock porting specialist
Jan 10, 2012
127
166
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It desperately needs more compression. I raised the exhaust a fair amount and it just doesn't have the guts it should. The OEM topend has a popup and something like 185-190 PSI compression. I haven't checked this one yet, as it's still cooling off.

[video=youtube_share;M0RYhJNhx88]http://youtu.be/M0RYhJNhx88[/video]
 

blsnelling

Slower than stock porting specialist
Jan 10, 2012
127
166
43
Well, my theory that it was compression may not be right. It has 170 PSI. That's not what my OEM makes, but it's not less than 150 like I thought/hoped it would be. Perhaps it just doesn't like my numbers. I may still go ahead with boring the squish band out. That will drop my exhaust and transfers back down while getting the compression up at the same time. I trimmed the intake skirt to give it a few more degrees of intake, and it seemed to like that a little. You would think a higher exhaust would have made more RPMs, but it did not in this case. BTW, my blowdown is 18°, which is about what they are stock. If the squish band machining doesn't bring it around, the OEM topend will be going back on it just as it was. I've always been very pleased with how it ran. I just had this AM topend and wanted to do some experimenting with it.

This is with more intake duration. It lugs harder now.

[video=youtube_share;zHRT2Hh7Ub0]http://youtu.be/zHRT2Hh7Ub0[/video]
 

Metals406

346 and 372 spikes coming soon. PM me for details.
Jan 9, 2012
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NW Montana
Well, my theory that it was compression may not be right. It has 170 PSI. That's not what my OEM makes, but it's not less than 150 like I thought/hoped it would be. Perhaps it just doesn't like my numbers. I may still go ahead with boring the squish band out. That will drop my exhaust and transfers back down while getting the compression up at the same time. I trimmed the intake skirt to give it a few more degrees of intake, and it seemed to like that a little. You would think a higher exhaust would have made more RPMs, but it did not in this case. BTW, my blowdown is 18°, which is about what they are stock. If the squish band machining doesn't bring it around, the OEM topend will be going back on it just as it was. I've always been very pleased with how it ran. I just had this AM topend and wanted to do some experimenting with it.

This is with more intake duration. It lugs harder now.

[video=youtube_share;zHRT2Hh7Ub0]http://youtu.be/zHRT2Hh7Ub0[/video]
What's wrong with that saw? It's bar deep in a big hardwood, and seems like it's holding plenty of rpm. . . You could maybe lower the stops a hair, but I don't think it's a dog by any means.

That wood is bigger than what you'd normally cut with a little 346 anyway.
 

blsnelling

Slower than stock porting specialist
Jan 10, 2012
127
166
43
What's wrong with that saw? It's bar deep in a big hardwood, and seems like it's holding plenty of rpm. . . You could maybe lower the stops a hair, but I don't think it's a dog by any means.

That wood is bigger than what you'd normally cut with a little 346 anyway.
Actually, one of those cuts bested my OEM topend. I'm just looking for more. That's all. I figure if I test with a 20" bar maxed out in hardwood, it should be good to go in a 10" cant.
 
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