ArboristSite.com Sponsors
 
 



 
 


Page 3 of 8 FirstFirst 12345 ... LastLast
Results 31 to 45 of 112
Like Tree107Likes

Thread: PS-7900 vs PS-7910

  1. 06-22-2012, 07:43 AM #31
    SkippyKtm
    SkippyKtm is offline
    The Lorax, my FIL rip...
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     SkippyKtm's Avatar
    Join Date
    Jan 2009
    Location
    The quiet corner, CT USA
    Posts
    2,702
    Credits
    1,086
    Quote Originally Posted by tdi-rick View Post
    My understanding of the new muffler is that it's a controlled bleed.

    It's using backpressure from the inner chamber to reduce the scavenging losses. This then bleeds into the main body of the muffler.

    It'll be interesting to see what differences there are in port timing and port sizing between the new and old jugs too.
    That's my take on it too, it reminds me of a Husky 266 I bought on CL with a plugged exhaust where the muffler itself was behaving somewhat like a primitive Dolmar chamber, except with less bleed. It would start just fine then run for about 5 seconds and quit. Then you could restart it right away once the pressure bled off and repeat the same process. I'm not saying the 7910 would run exactly that way, but I'm guessing that there is something lost there.
    I hope I'm wrong, but time will tell if there is some loss in power -there's no free lunch so to speak.
    Last edited by SkippyKtm; 06-22-2012 at 07:49 AM.
    Reply With Quote Reply With Quote
  2. 06-22-2012, 08:17 AM #32
    w8ye
    w8ye is online now
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     w8ye's Avatar
    Join Date
    Apr 2011
    Location
    Ohio
    Posts
    2,934
    Credits
    4,954
    As far as the so called bleed rates or the tuning of the muffler chamber goes, I could see it being more effective, EPA wise, at certain rpm's?
    Dolmar 115i, 6800iH
    Stihl 025, FS-45, FS-55, HS-80-R-24
    Echo PB-2400, SRM-2100, SRM-2400, TC-210
    Reply With Quote Reply With Quote
  3. 06-22-2012, 08:26 AM #33
    SawTroll
    SawTroll is offline
    Information Collector
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     SawTroll's Avatar
    Join Date
    Jan 2005
    Location
    Troms, North Norway
    Posts
    48,873
    Credits
    14,513
    Quote Originally Posted by nmurph View Post
    You better not let Niko read that the 7910 doesn't weigh more. He was just waving that around in another thread moments ago.

    Is there any chance the new coil is unlimited??? Nahh, I didn't think so...that would be too easy!
    That is specs, and according to those the 7910 is heavier, and has .3 kW less power - but specs are specs....

    The 7910 specs are 14.7 lbs/6.7 kg and 4.3 kW/5.9 hp - the 7900 specs were about a pound less (6.3 kg) and 4.6 kW/6.3 hp.

    It was well known that the weight spec of the 7900 was "optimistic", but it hardly was known that it weighted as much as Scott found.....

    A rev limiter at 12,800 sound really scary, what's the reason for that?

    Btw, my brother is very happy with his 7900 (a new Euro one) so far, except that the potential for porting is somewhat limited.....
    Last edited by SawTroll; 06-22-2012 at 08:56 AM.
    SkippyKtm likes this.
    Firewood saws: Jonsereds Raket 621 (1970), Husky 353G (2003), Euro Stihl MS361W (2004), Husky 372xpg (nov 2006), Husky 339xp (may 2007), Husky 346xpg New Edition (sept 2007), Jonsered 2153WH (april 2010), Husky 560xpg (nov 2011).

    Witchys saw, Dolmar PS5100SH (also may 2007). Rest in peace, my love!

    Flying Witch smiley by talon1189.
    Avatar by 04Ultra.

    Reply With Quote Reply With Quote
  4. 06-22-2012, 09:55 AM #34
    Tim Carroll
    Tim Carroll is offline
    Senior Member
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     Tim Carroll's Avatar
    Join Date
    Aug 2008
    Location
    West Central Wisconsin
    Posts
    363
    Credits
    266
    Quote Originally Posted by cuttinscott View Post
    Well the NEW PS-7910 are selling, and anyone that has bought them or tried them has been HAPPY. As far as NET Weight for Power Head Only as comes in the box here are the results...........

    Stock Dry New PS-7900 per our digital UPS Legal scales 14.8 pounds
    Stock Dry New PS-7910 per our digital UPS Legal scales 14.8 pounds


    Hmmmm same weight, brattier exhaust note, NO CAT, Adjustable Carburator, 15% better on fuel, cleaner running to keep the EPA happy whats not to like??
    as far as gross horsepower well I dont have a dyno But in side by side comparison cutting real Logs burring a 24" bar in hardwood 7900 vs 7910 the power and torque are very close!
    The EPA Legal saw is still VERY EASY to Service, and do repairs to no major redesign to the saw..., it does have a SLR Muffler, new Cylinder with top side deco, the new lightweight piston same as late model PS-7900's New crank, new coil and a different flywheel. The carb has adjustment screws and a vent hose off the metering pump cover. So again Whats not to Like I ask?????

    Both above models are less weight than the CAT equipped PS-6400



    Scott
    Thanks for posting your findings Scott, I was curious about how the new saws compared myself. I am glad Dolmar has a viable replacement for the 7300 and 7900. I was worried they would not get it figured out.


    Dolmar 5100 S     the little saw that could
    Stihl 029 old reliable
    McCulloch MS3516 the limber
    Dolmar 7300 the new arrival
    McCulloch Pro Mac 55 Dad bought new in 1977
    Enviro Kodiak 1700 Insert the reason I have saws
    Fiskars X27
    "Proud member of the 5100 s survivor club and support group"
    Reply With Quote Reply With Quote
  5. 06-22-2012, 11:05 AM #35
    166
    166 is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     166's Avatar
    Join Date
    Mar 2004
    Location
    Greenwich, NY
    Posts
    1,606
    Credits
    412
    Quote Originally Posted by SawTroll View Post
    That is specs, and according to those the 7910 is heavier, and has .3 kW less power - but specs are specs....

    The 7910 specs are 14.7 lbs/6.7 kg and 4.3 kW/5.9 hp - the 7900 specs were about a pound less (6.3 kg) and 4.6 kW/6.3 hp.

    It was well known that the weight spec of the 7900 was "optimistic", but it hardly was known that it weighted as much as Scott found.....

    A rev limiter at 12,800 sound really scary, what's the reason for that?

    Btw, my brother is very happy with his 7900 (a new Euro one) so far, except that the potential for porting is somewhat limited.....
    13.6 Pounds Original PS-7900 with Euro Small Spike Bar and no clutch cover
    13.8 Pounds Original PS-7900 with large US Spike Bar and no clutch cover
    14.6 Pounds Original PS-7900 with US Spike bars and clutch cover
    14.8 Pounds Late model PS-7900 with US Spikes and clutch cover with minor changes and upgrades in the saw
    14.8 Pounds New PS-7910 with US Spikes and clutch cover

    So in real world numbers this saw has gained .2 lbs in the last 10 years.
    SawTroll likes this.
    A few 166's & KMS-4's
    Reply With Quote Reply With Quote
  6. 06-22-2012, 11:14 AM #36
    Hedgerow
    Hedgerow is offline
    HACK
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     Hedgerow's Avatar
    Join Date
    Dec 2010
    Location
    Carthage, MO
    Posts
    10,319
    Credits
    10,137
    Quote Originally Posted by blsnelling View Post
    Baaaah Humbug!!!!!!!!!!!! That limited coil in and of itself is enough to ruin that claim.
    Where's that blasted DISLIKE button!!???
    Locust Cutter likes this.
    Too many saws...
    Only need one more...

    Nope. I am sans gall bladder therefore I must be ever so careful as to the food I ingest for fear of making a Jackson Pollack painting in my britches... Jon1212
    "Ya just can't get naked enough to stay cool in that kinda heat"...
    (Loggin22)
    Reply With Quote Reply With Quote
  7. 06-22-2012, 12:00 PM #37
    SawTroll
    SawTroll is offline
    Information Collector
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     SawTroll's Avatar
    Join Date
    Jan 2005
    Location
    Troms, North Norway
    Posts
    48,873
    Credits
    14,513
    Quote Originally Posted by 166 View Post
    13.6 Pounds Original PS-7900 with Euro Small Spike Bar and no clutch cover
    13.8 Pounds Original PS-7900 with large US Spike Bar and no clutch cover
    14.6 Pounds Original PS-7900 with US Spike bars and clutch cover
    14.8 Pounds Late model PS-7900 with US Spikes and clutch cover with minor changes and upgrades in the saw
    14.8 Pounds New PS-7910 with US Spikes and clutch cover

    So in real world numbers this saw has gained .2 lbs in the last 10 years.
    So the 7900 specs were without the clutch cover - that's quite disturbing.......
    Firewood saws: Jonsereds Raket 621 (1970), Husky 353G (2003), Euro Stihl MS361W (2004), Husky 372xpg (nov 2006), Husky 339xp (may 2007), Husky 346xpg New Edition (sept 2007), Jonsered 2153WH (april 2010), Husky 560xpg (nov 2011).

    Witchys saw, Dolmar PS5100SH (also may 2007). Rest in peace, my love!

    Flying Witch smiley by talon1189.
    Avatar by 04Ultra.

    Reply With Quote Reply With Quote
  8. 06-22-2012, 12:41 PM #38
    redoakneck
    redoakneck is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     redoakneck's Avatar
    Join Date
    Jul 2010
    Location
    ohio
    Posts
    1,090
    Credits
    761
    Quote Originally Posted by SawTroll View Post
    So the 7900 specs were without the clutch cover - that's quite disturbing.......

    Yes, Yes it is. It is a real challenge to keep the chain tight on these dollys as the tensioner is in the cover, and when the cover isn't on I have to hold the bar out and tight when I cut, and I am running out of fingers!!! Even my friends won't hold the bar when I cut, ya just can't find good help these daze.
    A strong back and a weak mind have left me with the " if yer gonna be stupid, you better be tough" mentality
    Reply With Quote Reply With Quote
  9. 06-22-2012, 12:52 PM #39
    SawTroll
    SawTroll is offline
    Information Collector
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     SawTroll's Avatar
    Join Date
    Jan 2005
    Location
    Troms, North Norway
    Posts
    48,873
    Credits
    14,513
    Quote Originally Posted by redoakneck View Post
    Yes, Yes it is. It is a real challenge to keep the chain tight on these dollys as the tensioner is in the cover, and when the cover isn't on I have to hold the bar out and tight when I cut, and I am running out of fingers!!! Even my friends won't hold the bar when I cut, ya just can't find good help these daze.
    Firewood saws: Jonsereds Raket 621 (1970), Husky 353G (2003), Euro Stihl MS361W (2004), Husky 372xpg (nov 2006), Husky 339xp (may 2007), Husky 346xpg New Edition (sept 2007), Jonsered 2153WH (april 2010), Husky 560xpg (nov 2011).

    Witchys saw, Dolmar PS5100SH (also may 2007). Rest in peace, my love!

    Flying Witch smiley by talon1189.
    Avatar by 04Ultra.

    Reply With Quote Reply With Quote
  10. 06-22-2012, 12:52 PM #40
    tdi-rick
    tdi-rick is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     tdi-rick's Avatar
    Join Date
    Jun 2008
    Location
    A little all over the place, or maybe that's just my state of mind....
    Posts
    5,098
    Credits
    2,300
    Quote Originally Posted by SawTroll View Post
    So the 7900 specs were without the clutch cover - that's quite disturbing.......
    I thought I'd read on here quite a while ago (and I thought you might have mentioned it) that's how some of the manufacturers presented their 'weights' in the past ?
    Sent from my humpy via clapping sticks, a bull roarer.....and a few smoke signals, now that frost is upon the ground
    Reply With Quote Reply With Quote
  11. 06-22-2012, 01:04 PM #41
    SawTroll
    SawTroll is offline
    Information Collector
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     SawTroll's Avatar
    Join Date
    Jan 2005
    Location
    Troms, North Norway
    Posts
    48,873
    Credits
    14,513
    Quote Originally Posted by tdi-rick View Post
    I thought I'd read on here quite a while ago (and I thought you might have mentioned it) that's how some of the manufacturers presented their 'weights' in the past ?
    All I remember about that is that someone claimed that Husky did it, but that wasn't true. They have made at least one mistake with not adjusting the specs when beefing up crankcases though, and no brand I know of has a perfect record regarding weight specs.....
    Firewood saws: Jonsereds Raket 621 (1970), Husky 353G (2003), Euro Stihl MS361W (2004), Husky 372xpg (nov 2006), Husky 339xp (may 2007), Husky 346xpg New Edition (sept 2007), Jonsered 2153WH (april 2010), Husky 560xpg (nov 2011).

    Witchys saw, Dolmar PS5100SH (also may 2007). Rest in peace, my love!

    Flying Witch smiley by talon1189.
    Avatar by 04Ultra.

    Reply With Quote Reply With Quote
  12. 06-22-2012, 02:08 PM #42
    SawTroll
    SawTroll is offline
    Information Collector
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     SawTroll's Avatar
    Join Date
    Jan 2005
    Location
    Troms, North Norway
    Posts
    48,873
    Credits
    14,513
    Quote Originally Posted by Hedgerow View Post
    Where's that blasted DISLIKE button!!???
    I would have got a lot of those I guess, if that button existed!
    Andyshine77, gmax, mdavlee and 6 others like this.
    Firewood saws: Jonsereds Raket 621 (1970), Husky 353G (2003), Euro Stihl MS361W (2004), Husky 372xpg (nov 2006), Husky 339xp (may 2007), Husky 346xpg New Edition (sept 2007), Jonsered 2153WH (april 2010), Husky 560xpg (nov 2011).

    Witchys saw, Dolmar PS5100SH (also may 2007). Rest in peace, my love!

    Flying Witch smiley by talon1189.
    Avatar by 04Ultra.

    Reply With Quote Reply With Quote
  13. 06-23-2012, 06:51 PM #43
    166
    166 is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     166's Avatar
    Join Date
    Mar 2004
    Location
    Greenwich, NY
    Posts
    1,606
    Credits
    412
    Quote Originally Posted by SawTroll View Post
    So the 7900 specs were without the clutch cover - that's quite disturbing.......
    I explained the weight of these saws back in a thread from 2004. But that was before you were here but we had glens to pick apart the specs on the 7900 back then.

    dolmar?
    Last edited by 166; 06-23-2012 at 06:57 PM.
    A few 166's & KMS-4's
    Reply With Quote Reply With Quote
  14. 06-23-2012, 07:45 PM #44
    166
    166 is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     166's Avatar
    Join Date
    Mar 2004
    Location
    Greenwich, NY
    Posts
    1,606
    Credits
    412
    A few 166's & KMS-4's
    Reply With Quote Reply With Quote
  15. 06-23-2012, 08:01 PM #45
    benp
    benp is offline
    Arboristsite MVP
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation
    Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation Reputation     benp's Avatar
    Join Date
    Feb 2010
    Location
    Northern MN
    Posts
    622
    Credits
    415
    Quote Originally Posted by 166 View Post
    That'll do.

    Quite the sassy tone on that. I like it.
    Stumpy's Raffle Dolkita 7901
    Dolmar - 510 / 7900 - EC Saw Spa'd
    Husqvarna - 394XP - Mweba'fied
    Echo - 660 EVIL
    Reply With Quote Reply With Quote
Page 3 of 8 FirstFirst 12345 ... LastLast
« Previous Thread | Next Thread »

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Page generated in 0.29501 seconds with 43 queries [Server Loads: 0.96 1.06 : 1.36]