Dolmar_Tech_Mgr
ArboristSite Operative
artwood said:
I am curious as to where you see these different specs. The 7901 is not listed on the Makita USA website and on the Dolmar USA website is show 6.3bhp?
Dolmar 7900
- Thread starter artwood
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I am curious as to where you see these different specs. The 7901 is not listed on the Makita USA website and on the Dolmar USA website is show 6.3bhp?
Dolmar_Tech_Mgr
ArboristSite Operative
FYI, there is a pre-filter available for the 6400-7900 saws that attachs to the outside of the filter hood. Part number 038173200. Attached is a picture.
*If* the 7900 is closed port then, as to 7300 or 7900 it's a no brainer as bwalker said.
But, is the 7900 is closed port? It's hard to get an answer. There are posts all over the map on this one. one says, 6400s are closed, another they are open. Note the silence of domar_tech on the point. Other threads have stated that the 6400 and 7900 are open port, the 7300 closed, in which case the fuel efficiency and torque of the significantly more expensive construction of the closed port design might give a better "end of the day" value to the theoretically "smaller" but more fuel efficient and more expensive to produce but less expensive to buy 7300.
Did Dolmar ever produce a set of full wrap bars for the 6400-7900 frame? There was some talk of them a while ago. By comparison to the small increase in cost and weight, the gains in working strength and in situation control, as to direction of cut, meaning increased safety and speed in working situations with bigger sticks, IMHO start to make FW bars a must somewhare around the 5 cube (minus a few cc) range.
I love that external filter. BRAVE! idea! and BRAVO! Only one criticism, make it much bigger. While working, you just brush off the cover, now functioning as the air filter itself!, with your glove when you pick up the saw, while you are working. Leave the same low pressure drop, e.g. large surface area micro filter on the carb, e.g. on the "inside," but consider that the inside filter is not the *Working air filter. Then put the *Real filter on the dagg blammed outside of the saw, right where it belongs, and make it smooth. Right on! Another innovation from Dolmar!-- just carry that design thought a little further--produce a new optional plastic cover, with bigger openings with larger detachable "working filters" .. Darn! You won't have to pull a cover anymore (and expose the throat etc. and carry brushes etc.) to clean a filter. You just --brush the filter off with your glove. The more expensive inner filters would last longer between cleanings and replacements.
What a great idea!
But, is the 7900 is closed port? It's hard to get an answer. There are posts all over the map on this one. one says, 6400s are closed, another they are open. Note the silence of domar_tech on the point. Other threads have stated that the 6400 and 7900 are open port, the 7300 closed, in which case the fuel efficiency and torque of the significantly more expensive construction of the closed port design might give a better "end of the day" value to the theoretically "smaller" but more fuel efficient and more expensive to produce but less expensive to buy 7300.
Did Dolmar ever produce a set of full wrap bars for the 6400-7900 frame? There was some talk of them a while ago. By comparison to the small increase in cost and weight, the gains in working strength and in situation control, as to direction of cut, meaning increased safety and speed in working situations with bigger sticks, IMHO start to make FW bars a must somewhare around the 5 cube (minus a few cc) range.
I love that external filter. BRAVE! idea! and BRAVO! Only one criticism, make it much bigger. While working, you just brush off the cover, now functioning as the air filter itself!, with your glove when you pick up the saw, while you are working. Leave the same low pressure drop, e.g. large surface area micro filter on the carb, e.g. on the "inside," but consider that the inside filter is not the *Working air filter. Then put the *Real filter on the dagg blammed outside of the saw, right where it belongs, and make it smooth. Right on! Another innovation from Dolmar!-- just carry that design thought a little further--produce a new optional plastic cover, with bigger openings with larger detachable "working filters" .. Darn! You won't have to pull a cover anymore (and expose the throat etc. and carry brushes etc.) to clean a filter. You just --brush the filter off with your glove. The more expensive inner filters would last longer between cleanings and replacements.
What a great idea!
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artwood
ArboristSite Operative
Makita specs on
the Bailey's website for the DCS7901 are 5.8 bhp vs. the 6.4 on the Dolmar website. I saw the same specs on another website selling Makita saws.
Eric
the Bailey's website for the DCS7901 are 5.8 bhp vs. the 6.4 on the Dolmar website. I saw the same specs on another website selling Makita saws.
Eric
I know for a fact the 7900 is a closed port cylinder.
cuttinscott
Addicted to ArboristSite
Ive been in them all the 6400 is open port the 73 & 7900 are closed port
SCOTT
SCOTT
Dolmar_Tech_Mgr
ArboristSite Operative
Sorry for the silence, 6400 is open 7300 and 7900 are closed.
Dont know where Baileys is getting their information from. Makita and Dolmar are the same. Not sure where you are getting 6.4 from the Dolmar website. It say 6.3bhp when i pull up the technical data on www.dolmarusa.com
Dont know where Baileys is getting their information from. Makita and Dolmar are the same. Not sure where you are getting 6.4 from the Dolmar website. It say 6.3bhp when i pull up the technical data on www.dolmarusa.com
Dolmar_Tech_Mgr
ArboristSite Operative
I looked at the specs on Baileys website and what they are closer to the 7300 than the 7900. Not real sure where they got that data from.
pallis
ArboristSite Operative
Dolmar_Tech_Mgr said:
I think I mentioned this earlier.
Dolmar_Tech_Mgr
ArboristSite Operative
You did but I wanted to speak up as I being accused of being silent. No reason for the silence as you answered the question.
pallis
ArboristSite Operative
It has the ring of authority when you say it. I was just having fun.
keith c raymond
ArboristSite Operative
Hey DTM,Is Dolmar going to do an upgrade of the9010?
SawTroll
Information Collector
I think Dolmars US website is slightly misleading, as it list the hp numbers listed elsewere as they were bhp, without recalculating the numbers.Dolmar_Tech_Mgr said:
6.3 bhp will usually translate into 6.4 hp.
Some time ago I read somewhere that the 7300 engine is a 8 channel design, vs. 4 channel in the 7900.
Is there any truth is that?
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SawTroll
Information Collector
Makita 5200 equals Dolmar 115, and is a closed port design.Molecule said:
Makita 520 equals Dolmar 111, and is a open port design.
The 540 is probably an EPA special, with slightly more cc, but less power output than the 111/520.
SawTroll
Information Collector
The Dolmar numbers are probably accurate regarding listed kW output, but it seems like they have added a "b" to the hp ratings as an afterthought, making it read bHP, without recalculating the numbers. :umpkin:TonyM said:
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SawTroll
Information Collector
Probably from the Makita website and/or user manual.Dolmar_Tech_Mgr said:
The mistaken numbers has been published both places. :umpkin:
artwood
ArboristSite Operative
Are the Dolmar saws using nikosil (not sure of spelling) cylinders?
What is the advantage over chrome like Red Max & Shindaiwa uses?
Doesn't chrome make for a longer lasting engine? - Eric
What is the advantage over chrome like Red Max & Shindaiwa uses?
Doesn't chrome make for a longer lasting engine? - Eric
I'm sure someone that knows a lot more about it than me will chime in but nikasil is many times harder and retains oil better than chrome. It seems most european saw makers (husky, stihl, dolmar) now use nikasil where as ones from the east (shindaiwa, redmax, echo) still use chrome. Probably more costly/scarce to the japanese market?
TonyM
ArboristSite Guru
Nikasil is the higher quality cylinder material. Dolmar uses Nikasil.
