A Tale of Three Saws

[AUSSIE1]

The 372 that I ported was about 15% faster than the stock 390. When ported in about 2 ft oak the 390 was only a second faster. A 390 feels like a 70cc saw with 90 cc saw power.

Any alteration to durations?

 

[mdavlee]

Nope, I've never even checked timing on any saws yet. Just basic widening of intake and exhaust. Didn't even touch the lower transfers at all. You can look at videos of them on youtube. Just search my user name on here. I don't want to clutter up this thread too much.

 

[MCW]

Nope, I've never even checked timing on any saws yet. Just basic widening of intake and exhaust. Didn't even touch the lower transfers at all. You can look at videos of them on youtube. Just search my user name on here. I don't want to clutter up this thread too much.

If you want to whack Youtube links in I say go for it

 

[Evan]

heck why not throw a 359 in the mix for sawtroll

 

[blsnelling]

OK Erick, you talked me into it The first clip here is way less than ideal. I wanted to bury the bars, but didn't have a good piece of wood to do it in. So take it for what it's worth. I didn't realize the bar wasn't all the way in the wood on the first cut of the 7901. Oh well. A couple things are still pretty clear though.

1. The 7901 is still fastest under both normal and max loads.
2. The 390 is a hair faster than the 660 under both normal and max loads. I'm talking like 0.10-0.30 seconds.
3. All of the saws made slower cuts under max load than normal load, where as they were all faster under max load with a 7-pin.
4. Bottom line, the 390 and 660 are still very comparable.
5. They all pull an 8-pin rim well in this wood with 24" B&Cs.


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[blsnelling]

The results in this vid are the same.


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[blsnelling]

Am I allowed to port them now?:greenchainsaw:

 

[Anthony_Va.]

Am I allowed to port them now?:greenchainsaw:

Have at it brother!

 

[TRI955]

Still want a 390XP....

 

[little possum]

ported 79ers :drool:
Got to run another one today, compared to stock.

Well worth opening the ports up. :jawdrop:

But I still like the 390Xp

 

[Tiger Rag]

ported 79ers :drool:
Got to run another one today, compared to stock.

Well worth opening the ports up. :jawdrop:

But I still like the 390Xp

Uuuuuuh, yep on the ported 7900! Wow! I didn't know I could smile that big. Might need to send Brad a package soon!

 

[jeepyfz450]

pretty cool tests and vids. do you think the results would be the same in 30+'' wood with the 2 stock big boys and the ported kitty?

 

[MCW]

Am I allowed to port them now?:greenchainsaw:

Go nuts Brad

Super nuts...

Do you think it's worth doing pop ups as well?

 

[blsnelling]

Go nuts Brad

Super nuts...

Do you think it's worth doing pop ups as well?

I believe you get 95% of the gains without the popup. Plus that just complicates things should you ever need to replace the piston. I'm inclined to leave them be.

 

[MCW]

I believe you get 95% of the gains without the popup. Plus that just complicates things should you ever need to replace the piston. I'm inclined to leave them be.

No probs Brad. Just checking Good stuff by the way. Hope you don't run out of wood!

 

[blsnelling]

No probs Brad. Just checking Good stuff by the way. Hope you don't run out of wood!

There are only 2 trees on this property left to drop. Both are greater than 40" Oaks! There are still several trunks I've not bucked up, that I hope to mill sometime.

 

[Erick]

Am I allowed to port them now?:greenchainsaw:

Alright, well I guess you can go ahead and port them... you have my blessing.

 

[gink595]

ported 79ers :drool:
Got to run another one today, compared to stock.

Well worth opening the ports up. :jawdrop:

But I still like the 390Xp

Whos ported 7900 did you run?

 

[MCW]

There are only 2 trees on this property left to drop. Both are greater than 40" Oaks! There are still several trunks I've not bucked up, that I hope to mill sometime.

Seriously though if you have any issues finding wood by all means mod them, send them out, and I'll run vids out here. I sometimes forget that I've got wood everywhere here. You could live in a desert for all I know

It's also a big no no to start hacking into good milling logs. I did that once then realised later what that particular piece of wood was worth to a guy I know that does woodturning. He was gonna kill me when I told him

 

[little possum]

Whos ported 7900 did you run?

JT78's self ported 79er