Jmssaws ms460

[Mastermind]

Two saws with the same numbers can run very different.

Welcome to my world. lol

 

[mdavlee]

Welcome to my world. lol

Everyone's world in building stuff

 

[paragonbuilder]

Welcome to my world. lol

So really each saw needs to be built as its own entity? Numbers just get you close?

 

[drf256]

So really each saw needs to be built as its own entity? Numbers just get you close?

2/3rds of saw building is 1/2 luck.

 

[jmssaws]

So really each saw needs to be built as its own entity? Numbers just get you close?

That's how I do it.
Each one likes something different.

 

[huskihl]

I've been pondering this for awhile. The 7900 is notorious for having a small case for a 79cc saw. It likes 30ish° of blowdown. Is there any merit to the thought that: given the small case, not much fuel/air mix can get in there. Therefore the lower the transfers are (physically), the less distance the fuel/air mixture has to flow to get from the case to on top of the piston? Basically, the longer the transfers are, the more charge is left in them and not making it to the cylinder wall. My theory may be blown all to hell though when you factor in another revolution or 2 or....1,000,000

 

[Mastermind]

2/3rds of saw building is 1/2 luck.

Ha!!! I like that.

I've been pondering this for awhile. The 7900 is notorious for having a small case for a 79cc saw. It likes 30ish° of blowdown. Is there any merit to the thought that: given the small case, not much fuel/air mix can get in there. Therefore the lower the transfers are (physically), the less distance the fuel/air mixture has to flow to get from the case to on top of the piston? Basically, the longer the transfers are, the more charge is left in them and not making it to the cylinder wall. My theory may be blown all to hell though when you factor in another revolution or 2 or....1,000,000

Kevin, the tighter the case is, the more quickly the air/fuel mixture reacts to movement of the piston. Think of the air as a compressible, stretchable substance.....

Does that make any sense?

 

[jmssaws]

A 288 piston in a 066 decreases capacity so more blow down is required.
Like randy said,tight case needs more bd

 

[Mastermind]

I'm tearing down two saws at a time, doing the machine work, then the port work, and finally the mufflers. I try to stay on them till they are done. That's not leaving me much free time during the day. I wish I had more time to be on here talking theory. I love doing that. It never gets old.

 

[jmssaws]

Once I start on one I don't stop till it's done. I don't like starting and stopping

 

[Deets066]

Once I start on one I don't stop till it's done. I don't like starting and stopping

That's my problem, I usually don't have time to follow it through from start to finish

 

[paragonbuilder]

That's my problem, I usually don't have time to follow it through from start to finish

That's how it goes for me too...[emoji19]

 

[jmssaws]

Deets came down today so no saws got ported but I did finally get to run a 090!

 

[Redfin]

Once I start on one I don't stop till it's done. I don't like starting and stopping

And you can build one fast too.

 

[MustangMike]

I'm just glad that I'm only on the trigger pulling end of all this stuff, and equally glad that I've been afforded the opportunity to pull the trigger on work from all of you!!!

Keep up the great work guys, a combo of mechanical skill, theory and luck!

 

[paragonbuilder]

Hey isn't this a build thread??? Where is muh saw?


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[Deets066]

Hey isn't this a build thread??? Where is muh saw?


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I pushed it in the corner wif muh foot

 

[paragonbuilder]

I pushed it in the corner wif muh foot

That's where it stayed here too... But after tomorrow it should be different!
Maybe Jason can turn the badge upside down, turning the 460 into an 064!!![emoji2]

 

[MustangMike]

He would, but he does not want to be responsible for creating inflation!!!

 

[Crzybowhntr]

Deets came down today so no saws got ported but I did finally get to run a 090!

Nope didn't happen. There's no video posted to prove it.