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#Post#: 39503--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: brettl Date: April 30, 2014, 7:11 pm
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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?
#Post#: 39513--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: 660magnum Date: April 30, 2014, 8:20 pm
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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.
(HTM) http://www.stihl.com/4-mix-engine-lightweight-and-with-good-lugging-power.aspx
#Post#: 39517--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: aclarke Date: April 30, 2014, 10:05 pm
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What kind if oiling system?
#Post#: 39519--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: 660magnum Date: April 30, 2014, 10:39 pm
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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.
#Post#: 39528--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: aclarke Date: April 30, 2014, 11:36 pm
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Ok thk. Is the Dolmar a regular wet sump or something
different? Ie. Dry sump
#Post#: 39536--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: NathanielVansickle Date: May 1, 2014, 9:14 am
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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.
#Post#: 39541--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: aclarke Date: May 1, 2014, 12:38 pm
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Thanks Nate!
#Post#: 39636--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: SawTroll Date: May 2, 2014, 9:13 pm
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A weak 50cc saw weighting like a 70cc saw, no thanks! ::)
#Post#: 39644--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: Chainsawrepair Date: May 2, 2014, 10:13 pm
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[quote author=SawTroll link=topic=3462.msg39636#msg39636
date=1399083204]
A weak 50cc saw weighting like a 70cc saw, no thanks! ::)
[/quote]
Where did it say it was 14lbs or heavier PHO? I've been looking
for specs but nothing in stone.
#Post#: 39712--------------------------------------------------
Re: Dolmar 500V 4 stroke
By: NathanielVansickle Date: May 3, 2014, 7:24 pm
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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. ???
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