Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Dolmar Makita => Topic started by: Cut4fun on April 23, 2014, 01:43:28 pm

Title: Dolmar 500V 4 stroke
Post by: Cut4fun on April 23, 2014, 01:43:28 pm
Just saving pics of the 4 stroke chainsaw dolmar 500 tested out about 10 years ago.  Noticed pics are disappearing now days.

removed 7 pics being hijacked by greedy PB. Sorry.

Added 3 embed pics below. Must be signed in to see.
Title: Re: Dolmar 500V 4 stroke
Post by: 660magnum on April 23, 2014, 02:00:52 pm
I bet there wouldn't be any specific parts for that device this side of the moon?

Appears to have some Solo influence in the design?
Title: Re: Dolmar 500V 4 stroke
Post by: KilliansRedLeo on April 23, 2014, 02:06:31 pm
Yeah but it sure would make a GREAT SHELF QUEEN! I want one just like the one in the pictures. I assume that it was around 50cc. What did the 'V' stand for in the name, surely not a 50cc 'V' twin!
Title: Re: Dolmar 500V 4 stroke
Post by: Cut4fun . on April 23, 2014, 02:22:51 pm
Found it in Dolmar history line.

2000
DOLMAR takes the wraps off the prototype of the world’s first 4-stroke chainsaw. The company launches a new range of professional chainsaws with an unrivalled power-to-weight ratio of 1.37 kg/kW. DOLMAR introduces the highly efficient Airmaster air filter system for its new professional chainsaws.

http://www.dolmar.com/company/history/
Title: Re: Dolmar 500V 4 stroke
Post by: Cut4fun . on April 23, 2014, 02:28:39 pm
Just digging up info.

Hope this works where you can read on it.   Click to make bigger then click on it again when magnifying glass shows up and you then can read it clearly.
Title: Re: Dolmar 500V 4 stroke
Post by: RoyM on April 23, 2014, 10:53:09 pm
I heard about it, Shindaiwa also had a prototype. Apparently the torque is something to behold but the world isn't ready for it. The Naderites haven't forced it on us...YET being the operative word. I talked to a Shinny rep, he tried an 80cc version in Japan with a 24" bar and full comp chain. Said it was unbelievable.
Title: Re: Dolmar 500V 4 stroke
Post by: 3000 FPS on April 23, 2014, 11:34:10 pm
The design and materials sounds expensive.   
I am impressed that the saw is capable of 12,500 rpm's.   That is a lot for a 4 stroke engine.
Title: Re: Dolmar 500V 4 stroke
Post by: SawTroll on April 24, 2014, 01:50:39 am
The design and materials sounds expensive.   
I am impressed that the saw is capable of 12,500 rpm's.   That is a lot for a 4 stroke engine.

Sort of - but power specs was low and weigth very high for a 50cc chainsaw. Rather hopeless effort really.  ::)
Title: Re: Dolmar 500V 4 stroke
Post by: 3000 FPS on April 24, 2014, 09:50:57 am
The design and materials sounds expensive.   
I am impressed that the saw is capable of 12,500 rpm's.   That is a lot for a 4 stroke engine.

Sort of - but power specs was low and weigth very high for a 50cc chainsaw. Rather hopeless effort really.  ::)

I agree but I am surprised they did as well as they did.

I wonder what the compression ratio was I did not see that.    Could be one reason why power was down.
Title: Re: Dolmar 500V 4 stroke
Post by: RoyM on April 24, 2014, 10:08:14 am
The design and materials sounds expensive.   
I am impressed that the saw is capable of 12,500 rpm's.   That is a lot for a 4 stroke engine.

Sort of - but power specs was low and weigth very high for a 50cc chainsaw. Rather hopeless effort really.  ::)
It may be forced on us whether we like it or not. Yes the horsepower is low compared to a two stroke but what we have here is pure torque. The 2 stroke has to be screaming to produce, once speed drops off it dies. A 4 stroke will keep pulling, that 50cc will likely run 3/8 chain quite happily. Still, I am going to keep my 2 stroke as long as possible, I like the simplicity and light weight.
Title: Re: Dolmar 500V 4 stroke
Post by: adam32 on April 24, 2014, 12:58:09 pm
Makita has a 4-stroke concrete saw out so it's only a matter of time till a chainsaw version pops up...
Title: Re: Dolmar 500V 4 stroke
Post by: Chainsawr on April 25, 2014, 06:55:11 am
All the new Dolmar trimmers are 4-stroke now.  And, they have the multi-position, run upside down engines available too.

They have the technology developed with 4-stroke handhelds.  I bet they just sit on it with chainsaws until they are forced into using it with environmental laws.
Title: Re: Dolmar 500V 4 stroke
Post by: Nathaniel Vansickle on April 25, 2014, 11:09:07 am
All the new Dolmar trimmers are 4-stroke now.  And, they have the multi-position, run upside down engines available too.

They have the technology developed with 4-stroke handhelds.  I bet they just sit on it with chainsaws until they are forced into using it with environmental laws.


They have an attachment series now with a pole saw and 2yr commercial warranty so they must have faith in them. I haven't had a single problem with the 4 stroke trimmers that we have sold.
This spring they did come out with a 2 stroke trimmer and later this summer they will have a curved shaft 2 stroke trimmer.
Title: Re: Dolmar 500V 4 stroke
Post by: aclarke on April 25, 2014, 11:31:13 am
Nate, True 4-stroke engine? Or 4-mix variety?
Title: Re: Dolmar 500V 4 stroke
Post by: Nathaniel Vansickle on April 25, 2014, 01:02:15 pm
true 4 stroke. amazing part is crankcase only holds 80 or 100ml of oil depending on model. push rod engine with adjustable rockers. single cam lobe that actuates the intake and exhaust valve. I took one home last spring and used it all year and didn't have any trouble with it. they are smooth and quiet. the leaf blowers are 4 stroke too. sell quite a few of the trimmers but cant seem to sell the handheld blowers
Title: Re: Dolmar 500V 4 stroke
Post by: fordfairlane78 on April 25, 2014, 01:33:16 pm
I have had a dolmar 4 stroke trimmer for about a year and it is a very smooth, powerful machine. It has the power of a stihl 4mix but much lighter. 245.1? I think?
Title: Re: Dolmar 500V 4 stroke
Post by: Cut4fun . on April 25, 2014, 01:46:35 pm
Only 4 stroke I have tried so far was my old honda mini tiller fg100.  Only thing that was wrong with it was they used a pos hoffco transmission gear case. Never any troubles out of the motor. 
Honda GX31 Four Stroke 31cc. I guess they put that motor on trimmers too.
Title: Re: Dolmar 500V 4 stroke
Post by: fordfairlane78 on April 26, 2014, 06:58:41 pm
I also have the mtd 4 stroke in craftsman clothing.  Its dependable and powerful but very heavy and has a very cheap feel to it. it accepts all my cheap attachments though which are good enough for me but as a trimmer it is a back breaker. I haven't ever turned it on it's side which is a no-no on these from what i hear. My dolmar 4 stroke trimmer is a 245.4 not 245.1. just used it and realized I mentioned the wrong number.
Title: Re: Dolmar 500V 4 stroke
Post by: Nathaniel Vansickle on April 26, 2014, 09:47:17 pm
The cheap mtd are just splash lubrication so running them on their side isn't good.
Title: Re: Dolmar 500V 4 stroke
Post by: 7sleeper on April 27, 2014, 09:02:14 am
The new dolmar's 4 stroke don't care about how they are held. So nothing to worry there.

7
Title: Re: Dolmar 500V 4 stroke
Post by: brettl on April 30, 2014, 08:11:40 pm
Is 4-mix type what you're referring to as splash lubrication?

And this new trimmer that operates at any angle is splash or true 4-stroke?
Title: Re: Dolmar 500V 4 stroke
Post by: 660magnum on April 30, 2014, 09:20:57 pm
The Stihl 4mix are definitely true four stroke with a intake and exhaust valve as far as the combustion cycle is concerned.

The oil in the fuel is the source of lubrication.

http://www.stihl.com/4-mix-engine-lightweight-and-with-good-lugging-power.aspx
Title: Re: Dolmar 500V 4 stroke
Post by: aclarke on April 30, 2014, 11:05:26 pm
What kind if oiling system?
Title: Re: Dolmar 500V 4 stroke
Post by: 660magnum on April 30, 2014, 11:39:06 pm
I have several 4 stroke model airplane engines that use the regular two stroke fuel.

They use blow-by past the rings to lubricate the bottom end. They last as long as the two strokes.

The small Honda four stroke has a impeller in the crankcase that whips the oil all around. You have to have it in a certain position to check the oil.
Title: Re: Dolmar 500V 4 stroke
Post by: aclarke on May 01, 2014, 12:36:14 am
Ok thk. Is the Dolmar a regular wet sump or something  different? Ie. Dry sump
Title: Re: Dolmar 500V 4 stroke
Post by: Nathaniel Vansickle on May 01, 2014, 10:14:55 am
The 246.4 and the attachment series  Dolmar  trimmers are a true 4 stroke with oil in crankcase and straight gas in the tank. they pump oil by crankcase pressure forcing oil through passages that have check valves for one way oil flow.
the 245.4 and 335.4 trimmers and the blowers don't have the check valve system...Honda system sounds similar to what these do.

the mtd, troybilt, Ryobi 4 stroke trimmers use a dipper system to just throw the oil around.

shindaiwa and stihl have 4-mix system which has no crankcase oil and instead uses mix gas to lube everything. I think they both had some problems in the beginning.
 We have a 4 mix stihl on the farm that is 8 years old or so and other than replacing the carb a couple times it has been great. Since the dolmar showed up it doesn't get used anymore though.


Title: Re: Dolmar 500V 4 stroke
Post by: aclarke on May 01, 2014, 01:38:24 pm
Thanks Nate!
Title: Re: Dolmar 500V 4 stroke
Post by: SawTroll on May 02, 2014, 10:13:24 pm
A weak 50cc saw weighting like a 70cc saw, no thanks!  ::)
Title: Re: Dolmar 500V 4 stroke
Post by: Cut4fun . on May 02, 2014, 11:13:29 pm
A weak 50cc saw weighting like a 70cc saw, no thanks!  ::)

Where did it say it was 14lbs or heavier PHO?  I've been looking for specs but nothing in stone.
Title: Re: Dolmar 500V 4 stroke
Post by: Nathaniel Vansickle on May 03, 2014, 08:24:16 pm
ok I may have spoken too soon. the 335.4 according to the sales flyer is the 360 degree engine and the product book doesn't list it as the 360 engine so idk for sure which it is. ???
Title: Re: Dolmar 500V 4 stroke
Post by: Nathaniel Vansickle on May 03, 2014, 08:38:38 pm
Back on the subject of the 4 stroke chainsaw. 4 stroke saw is probably a long ways from reality at this point. power to weight is nowhere near what even the worst 2stroke saws have and if i were to guess the price per hp is double. after those 2 obstacles are overcome i think it will be a good thing. i don't care about the emission side of things. The torque and ease of starting for some folks will make them appealing. That is what sells the trimmers so i imagine those same attributes would sell a saw.
Title: Re: Dolmar 500V 4 stroke
Post by: fordfairlane78 on May 03, 2014, 11:44:28 pm
ok I may have spoken too soon. the 335.4 according to the sales flyer is the 360 degree engine and the product book doesn't list it as the 360 engine so idk for sure which it is. ???
  I believe my 245.4 is a 360° as well as I have tried running it upside down and it is fine....no smoke or tapping. ...
Title: Re: Dolmar 500V 4 stroke
Post by: SawTroll on May 09, 2014, 11:02:31 am
A weak 50cc saw weighting like a 70cc saw, no thanks!  ::)

Where did it say it was 14lbs or heavier PHO?  I've been looking for specs but nothing in stone.

Likely the German Dolmar web-site, but it was almost 10 years ago, so I am not 100% sure it was there.
Title: Re: Dolmar 500V 4 stroke
Post by: 3000 FPS on May 09, 2014, 04:51:16 pm
A weak 50cc saw weighting like a 70cc saw, no thanks!  ::)

Where did it say it was 14lbs or heavier PHO?  I've been looking for specs but nothing in stone.

Likely the German Dolmar web-site, but it was almost 10 years ago, so I am not 100% sure it was there.

Dang you can remember the weight of a saw from ten years ago.   You have a better mind then me.   
Title: Re: Dolmar 500V 4 stroke
Post by: Cut4fun . on May 09, 2014, 06:48:43 pm
Found where I quoted a post from a dealer in US back in 2009.

Posted by US dealer.

Well it's not really top secret, as most you boys and girls know that Dolmar has been working on one. I personally have and probably will always like two strokes as they have a place in my heart. I may have to add a little more room in their for the new Dolmar 4 stroke chainsaw. I was outside at the 2006 Expo and saw the proto type 500V. Walked up to the guy and point blank asked him if I could run it, I think I startled him and he said yes. I suited up with chaps and a helmet. I picked up the saw and first off I noticed how easy it started. I stuck it in the log and WOW!!!!!!!!!!!!!!!!!!!!!!!!!!. I've never ran anything so smooth in my life. It was smoo..........th and quiet. I enjoyed the experience. Asked if I could get pictures and NOPE so you'll just have to wait. I do have a picture of me using it and I'll post it later. Was told production would be June 2007 ( sooner than I would have thought ) with saws in US maybe August. Of course this is projected and I would not write this as the gospel. Pricing at a guess will be 450 ish. I don't believe anyone could ever judge this saw without running it. Dolmar has the technology. Dolmar Rocks.
Yes it was a 50cc engine. The weight was to me ( maybe I was just excited to be able to run it) was light as it didn't feel heavy and I didn't even notice it. Of course 90 per cent of the time I had it it was in the cut. The power was different because I just kept going over in my head how smooth it was but it was not a 5100S. I would say the power is more like a 510 but I can see where a novice or beginner would love the power.

As for design of the engine I can't say because I couldn't see anything under that cover. The top cover looked a little higher but not in the way at all. If I were to rate the experience of this saw I would have to give it a 10 on a scale of 1 to 10 for concept, design, and performance for what the saw is designed for. Again, I'm not a fan of small 4 stroke engines as I've not really seen one yet that I would rather run than a 2 stroke but I may need to rethink that when I see the finished production 500V.
During the Louisville show we did a small test to run the PS-500V vs the PS-510 and the 4-stroke was right there with it in the three cuts, actually the 500V won 2 of the three times with different users. The sound from the 500V is decieveing. It does not sound like a 2-stroke but the torque is there and the RPM is 12,500 no load. This saw is going to surprise everyone next year when it is in production.
MORE ABOUT DOLMAR PS-500V FOUR STROKE CHAIN SAW..PROTOTYPE DEVELOPED IN 04'.USES 70% OF COMPONENTS OF PS-5000 SERIES..49.9CC 2VALVE O.H.V.PUSHROD..FLAT TAPPETS..USES 2CAMS IE..1FOR INT./EXH. TO MAINTAIN THERMODYNAMIC STABILITY..OVERALL HEIGHT IS 28MM(1") HIGHER/2LB. HEAVIER THAN PS-500..REV. LIMITER SET FOR 12,500, CENTRIFUGAL LIFTER FOR STARTING EASE..OIL/GAS LUBE..SIMILAR TO STIHL/SHIND. HYBRIDS ALLOWING ALL POSITION OPERATION..ENGINE OF PS-500 USED AS BENCHMARK WITH A POWER RATING OF 2.5KW(3.3 HORSE),PS-500V HAS 4% MORE,RATED AT 3.4 HORSEPOWER WITH POWER EXCEEDING 2STROKE OVER ENTIRE SPEED RANGE, IN UPPER RPM APPROACHES POWER OF PS-5000 PROFESS.SAW.THIS FIGURES OUT TO 52kW/l(69.6 HP/60CUBE. INCHES) WELL ABOVE BASE RATING OF 45kW/L(60 HP/60 CUB. INCHES) A NEW RECORD HIGH FOR HAND HELD FOUR STROKES..USES 22% LESS FUEL..ALTHOUGH PS-500 HAS EMISSIONS THAT ARE 30-40% LOWER THAN CURRENT AVAIL. 2STROKES AT A READING OF 90g/kWh FOR HC+NO THE PS-500V AT 20g/kWh LESSENS THIS AMT. BY 78%, THIS PUTS THE FOUR STROKE 60% BELOW EUROPE/USA STANDARDS OF 50g/kWH A SUBSTANTIAL DIFF.THIS INFO.OBTAINED FROM A 6-05' EDITION OF MTZ WORLDWIDE, A GERMAN TECH. MAGAZINE..



Title: Re: Dolmar 500V 4 stroke
Post by: 7sleeper on May 13, 2014, 05:56:06 am
A weak 50cc saw weighting like a 70cc saw, no thanks!  ::)
As if this was a elementary criteria for the homeowner/firewooder who uses his saw a few hours a year...

We won't recapitulate what innovations have sprung out of the husqvarna factory in the last 20 years, that might be a little embarrising....

7
Title: Re: Dolmar 500V 4 stroke
Post by: Cut4fun . on September 10, 2015, 07:51:37 pm
So did the dolmar 500 4 stroke die in the water?  Nothing for a long time now.
Title: Re: Dolmar 500V 4 stroke
Post by: Nathaniel Vansickle on September 11, 2015, 01:41:30 pm
if all that were true i would buy one in a heartbeat.
Title: Re: Dolmar 500V 4 stroke
Post by: SawTroll on September 12, 2015, 11:32:34 am
So did the dolmar 500 4 stroke die in the water?  Nothing for a long time now.

I believe it is safe to say so - looked more like a PR stunt than anything else?
Title: Re: Dolmar 500V 4 stroke
Post by: Cycledude on November 09, 2015, 03:03:10 am
Years ago Lots of folks thought 4strokes wouldn't work very good for boats, boy were they wrong, I would love to try a 4stroke saw.
Title: Re: Dolmar 500V 4 stroke
Post by: HolmenTree on August 17, 2018, 11:28:30 am
I have  to bump this, great read.
Title: Re: Dolmar 500V 4 stroke
Post by: Cut4fun . on May 04, 2019, 10:18:45 am
Years ago Lots of folks thought 4strokes wouldn't work very good for boats, boy were they wrong, I would love to try a 4stroke saw.

Rereading this. This is funny. I just bought a 25hp 4 stroke Yamaha for the pontoon. Love it so far. Nice and quit too.