Carbtard

[NateSaw]

What does your muffler look like?

I want to open it up more. Needs another hole.

 

[NateSaw]

When I had the jug on the lathe, I wanted to make a boring bar for beveling the chamber. I should have.

 

[NateSaw]

Plug look good on fuel. Saw pumps up to 235psi with auto gauge. Took alot of pulls to stop climbing. I'm glad you fellers are asking questions.

 

[NateSaw]

The piston isn't fully opening the uppers at this point.

 

[Ketchup]

I want to open it up more. Needs another hole.

That’s the first thing I would do.

 

[NateSaw]

I threw the wheel back on it. I didn't hit my mark on the uppers. They're too late. Trouble is, I don't think I have enough meat to raise more without blowing through.

 

[NateSaw]

362 cylinders:
First two are of I believe a version 1 cylinder that's available to me, and the second two are the jug that I've been working on. Other than the obvious revision on cooling fins, I'm wondering if there are any other changes they made. Are they compatible? Was the hood changed to accommodate the new fins? What have you guys seen here?

 

[NateSaw]

@farminkarman , thanks for the recipe. It's not there yet though. It needs more fuel. Smells lean. Once the rings fully seat I think it'll be hungrier. Thoughts?
@Ketchup , @drf256 , @Canadian farm boy ,@huskihl , @Mastermind , you've all done a bunch of these. What do you hear and see? Input always appreciated! Don't be nice!
106, 124/127, 78

 

[Ketchup]

I’m afraid I don’t have a lot of experience with 362. I’ve done three. The last one was a V2 and was the strongest. 105 (max width)/125 (flat)/76, dual port exhaust, 1/3 off the key. I took a significant amount of flange away from the lowers. If it’s blowing 235psi, I would raise or widen the exhaust.

 

[farminkarman]

@farminkarman , thanks for the recipe. It's not there yet though. It needs more fuel. Smells lean. Once the rings fully seat I think it'll be hungrier. Thoughts?
@Ketchup , @drf256 , @Canadian farm boy ,@huskihl , @Mastermind , you've all done a bunch of these. What do you hear and see? Input always appreciated! Don't be nice!
106, 124/127, 78

It doesn’t seem to me like it’s there either. Is that saw still running the same cylinder that you took a huge squish cut from?

 

[farminkarman]

I lost a bunch of saw testing videos from my phone about two months ago, so I only have what I posted on YouTube. If my memory serves me correctly, the last 362 I did ended up being within a half second of a Jred 2165 I sold. The cuts were in the same log, but different bar & chain. Here is the Jred for reference:

 

[NateSaw]

It doesn’t seem to me like it’s there either. Is that saw still running the same cylinder that you took a huge squish cut from?

Indeed it is.

 

[NateSaw]

I’m afraid I don’t have a lot of experience with 362. I’ve done three. The last one was a V2 and was the strongest. 105 (max width)/125 (flat)/76, dual port exhaust, 1/3 off the key. I took a significant amount of flange away from the lowers. If it’s blowing 235psi, I would raise or widen the exhaust.

I've been obsessing over the lowers.

 

[NateSaw]

I lost a bunch of saw testing videos from my phone about two months ago, so I only have what I posted on YouTube. If my memory serves me correctly, the last 362 I did ended up being within a half second of a Jred 2165 I sold. The cuts were in the same log, but different bar & chain. Here is the Jred for reference:

Jred Sounds great! I'll have a hard time taking the bosses saw hostage for another weekend of grinding. I definitely need to give it more fuel for safeties sake. I'm with you. It's still struggling. Still better than stock. but not there.

 

[Ketchup]

I've been obsessing over the lowers.

I can’t totally see what you did, but it looks like you ground a scoop into the flange at each lower. I did a bit of that with what was left but I completely removed more than half the flange in front of each tunnel. I was tempted to raise it past base height. I might next time.

I have also found generally that a little extra work in the back of the upper to make sure all the transitions are smooth goes a long way. 261/362 can be hard to see in that bend. I kinda grind by feel in there.

That saw doesn’t sound like it’s hitting the limiter or a high note. Needs more RPM?

 

[farminkarman]

I can’t totally see what you did, but it looks like you ground a scoop into the flange at each lower. I did a bit of that with what was left but I completely removed more than half the flange in front of each tunnel. I was tempted to raise it past base height. I might next time.

I have also found generally that a little extra work in the back of the upper to make sure all the transitions are smooth goes a long way. 261/362 can be hard to see in that bend. I kinda grind by feel in there.

That saw doesn’t sound like it’s hitting the limiter or a high note. Needs more RPM?

Gotta be careful messing with the cylinder extensions…you don’t want to cause the strato ports on the piston to short-circuit to the crankcase.

 

[Ketchup]

Gotta be careful messing with the cylinder extensions…you don’t want to cause the strato ports on the piston to short-circuit to the crankcase.

Oh, that’s right. Pretty sure I raised the flange to the skirt at BDC. It’s been a while. @NateSaw , listen to these other guys. My memory is a swirl of brake cleaner and gasoline.

 

[NateSaw]

I can’t totally see what you did, but it looks like you ground a scoop into the flange at each lower. I did a bit of that with what was left but I completely removed more than half the flange in front of each tunnel. I was tempted to raise it past base height. I might next time.

I have also found generally that a little extra work in the back of the upper to make sure all the transitions are smooth goes a long way. 261/362 can be hard to see in that bend. I kinda grind by feel in there.

That saw doesn’t sound like it’s hitting the limiter or a high note. Needs more RPM?

What was bothering me about the lowers is that they are visibly equal to or less than the area the uppers have become. That being said I rolled with it as is for two reason's. One, the piston seems so asymmetrical, and the skirts travel so low into the case, I feared weakening the bore flange sleeve thingy by making it too thin. Two, the jug is so low now that at bdc the piston crown is only unblocking half the uppers.
As far as rpm, I guess more would be cool if thats where it wants to be but with such high compression and low exhaust, I was aiming for raw grunt. It has more grunt. But I had hoped for even more than more. In that video it's running a 20" bar with an 8 pin. I used the was raker guide at the shallow setting. I believe that's 30thou? Anyhow,I like what your saying about the lowers Caleb. I'm sure it's obvious but I'm taking my novice insecurities out on you guys. I've been a sissy on this project. Tip toeing my way towards more power . Next weekend I'm going back into the carb to drift out that atomizer and be certain I saw what I think I did about the hole size/quantity. It definitely smells lean after a long cut and one thing I've learned from some of you fellas, is that just a scoche more fuel can make all the difference in the cut. I'm still trying to decide if I should pull the cylinder too and work those lowers. I'll probably work the carb and see what she does. I feel that's a must. Especially being the rings aren't seated yet. So you raised the bore flange sleeve thingy beyond stock? I had to raise it to clear the case. But I kept a close to stockish gap. I should put a ring in the cylinder and bdc the piston, then measure to the skirt and see how far up I could go and still support the piston....