262XP Day

[SawTroll]

View attachment 417731

1989!

 

[Mastermind]

Are the numbers the same for the ks cylinder? Or is that a different ball of wax ?

They are the same.

How much did you take out of the squish band?

How do you "take the transfers to 118" if they're at 116? I'm assuming that they come out lower after the machine work.

Do you feel that your theory of lowering exhaust helps the exhaust pressure to be lower and thus helps the difference in transfer pressure differential?

Can you post the numbers, after the squish and base cut, before you monkey with them?

BTW, you look more like Ergo.

The transfers are at 125, and the exhaust is at 107 after machine work.

The ports will not move the same. Remember rod angle, etc......

.040 out of the squish band, and .026 off the base.

 

[fastLeo151]

I might have an extra one. It would be an ugly son of a gun though.

Even new huskys are ugly, I'm interested.

 

[cuttinties]

They are the same.



The transfers are at 125, and the exhaust is at 107 after machine work.

The ports will not move the same. Remember rod angle, etc......

.040 out of the squish band, and .026 off the base.

From what I was taught and what I've learned is the more you lower the cylinder the faster numbers change with smaller amount of materials removed.

 

[drf255]

They are the same.



The transfers are at 125, and the exhaust is at 107 after machine work.

The ports will not move the same. Remember rod angle, etc......

.040 out of the squish band, and .026 off the base.

Got it.

So degree changes are not linear because of the variation in piston speed from the crank throw.

BTW, I reviewed all the pics in the thread. Your banana is supposed to go between the jugs, not in them.

 

[Mastermind]

From what I was taught and what I've learned is the more you lower the cylinder the faster numbers change with smaller amount of materials removed.

I'm not picking up what you're putting down.....

 

[drf255]

I'm not picking up what you're putting down.....

Exponential increases

 

[Mastermind]

Stop calling me names Al.

 

[cuttinties]

I'm not picking up what you're putting down.....

Say you drop a .020 base gasket and your intake goes from 145 to 147. But if you take another .020 off the base it may end up at 151. The piston has to travel further to cover up the port. (Only the intake seems to act this way) I'd say that piston speed plays a role. I'm horrible at explaining things my apologies I shouldn't have tried to[emoji52] throwing more confusion into your thread.

 

[Mastermind]

No worries.

I've noticed that the transfers move a bunch while the intake only drops a few degrees.

On this engine, I cut .026 off the base.....the intake moved about three degrees, but the transfers moved nine.

 

[drf255]

Stop calling me names Al.

I will refrain from further primate references for the rest of my days.

 

[old-cat]

OK, I've checked the timing numbers. Stock Mahle jug, with a base gasket.

EX: 103.5
TR: 116
IN: 69

That means we have only 12.5 degrees of blowdown. Cool huh?

Case compression angle is 47 degrees.

No wonder these saws are factory hotrods.

That satisfies all of my curiosity, right there!!!!!!!!

 

[Mastermind]

I will refrain from further primate references for the rest of my days.

I was talking about this.

Exponential increases.....

 

[drf255]

Oh.....

Carry on.

 

[Mastermind]

Repped.

 

[drf255]

What about exhaust pressure and exhaust opening. Do you feel that it plays any role?

Specifically with the transfer pressure differential?

 

[drf255]

Great Fricken thread this is.

 

[Mastermind]

What about exhaust pressure and exhaust opening. Do you feel that it plays any role?

Specifically with the transfer pressure differential?

Remember what I said about blowdown?

I use an exhaust to displacement rule.........

According to my rule, this saw will be at 103.

 

[Paragon Builder]

I think I remember you mentioned the exhaust to displacement rule in another thread. Was it your trade secret or can you share it?

 

[showrguy]

I should'nt be reading this thread.............This chit is way over my paygrade..
Carry on..