HUSQVARNA GETTING MORE BANG OUT OF A 372 XTORQ

[Gord]

rebuilding one right now and usually convert them to xp but this one is in good shape after a piston failure and not too familiar with them beyond stock just wondering besides porting the muffler and maybe getting more squish what more can be done, saw a utube video the he eliminated the divider in the rubber boot and air cleaner horn etc but is thee any gains from that -thx

 

[huskyboy]

Keep the divider, it just makes them eat more fuel with not much gain gutting it. At least that’s what I found in my experiences. I do cut out the divider in the filter horn, but leave the rest alone. The xtorq runs good modded with good torque/fuel economy. I do prefer the 50mm oe single ring old style setup though. Just my opinion.

 

[Gord]

Keep the divider, it just makes them eat more fuel with not much gain gutting it. At least that’s what I found in my experiences. I do cut out the divider in the filter horn, but leave the rest alone. The xtorq runs good modded with good torque/fuel economy. I do prefer the 50mm oe single ring old style setup though. Just my opinion.

I prefer the single ring myself-xp style but this will make someone a good firewood saw, my own is a slightly modded xp, not a big fan of xt but rare I get a good cylinder for one so why waist it, someone will enjoy it, thx for your feedback.

 

[huskihl]

I've ported some that ran similar to an xp. Fuel economy is much better though

 

[jacob j.]

I've ported some that ran similar to an xp. Fuel economy is much better though

Do you alter the X-torque piston at all?

 

[huskihl]

Do you alter the X-torque piston at all?

No

 

[Ronaldo]

I've ported some that ran similar to an xp. Fuel economy is much better though

Maybe a dumb question but if it uses a significant amount less fuel, is the engine getting less lubrication?

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[huskyboy]

Maybe a dumb question but if it uses a significant amount less fuel, is the engine getting less lubrication?

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That’s a good question. One for someone who knows what they are talking about lol. I’d take a guess that it’s just a more efficient motor. I imagine you get less loss of fuel out of exhaust port with a strato engine. The xtorq does have a heavier piston and plastic caged bearings, which is why it has a limited coil to keep it from over revving, not necessarily because of a lack of oil. Just imho.

 

[huskihl]

Maybe a dumb question but if it uses a significant amount less fuel, is the engine getting less lubrication?

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The average old school 2 stroke saw purges the spent exhaust gas with some of its fresh charge. In a strato, its purged with clean air. So whatever percentage that is, maybe 25-40%, is 25-40% less oil that's going through the case

 

[Nutball]

I figure the strato engines get the same amount of fuel to get the same amount of power. I assume a rich mix through the lower intake, which mixes with some of the pure air that goes into the cylinder first to get the right mixture. If that is how it works, the you still get roughly the same amount of oil through the engine, just not as much fresh oil blown straight out the exhaust.

But I hardly understand strato engines, so I could be all wrong

 

[huskihl]

I figure the strato engines get the same amount of fuel to get the same amount of power. I assume a rich mix through the lower intake, which mixes with some of the pure air that goes into the cylinder first to get the right mixture. If that is how it works, the you still get roughly the same amount of oil through the engine, just not as much fresh oil blown straight out the exhaust.

But I hardly understand strato engines, so I could be all wrong

The average old school 2 stroke saw purges the spent exhaust gas with some of its fresh charge. In a strato, its purged with clean air. So whatever percentage that is, maybe 25-40%, is 25-40% less oil that's going through the case

 

[Nutball]

I know, I saw. That's what prompted my response, figuring more oil still gets through the engine than you might think.

 

[huskihl]

I know, I saw. That's what prompted my response, figuring more oil still gets through the engine than you might think.

I've noticed they seem to run about 30% more efficient than the older 372's. They need around 14.5 parts air to 1 part fuel, so I don't see how there could a similar amount of oil going through the case

 

[Nutball]

I was saying a rich mix might enter the lower intake and later mix with the pure air that entered the upper intake bringing it to 14.5:1

 

[Ronaldo]

I've noticed they seem to run about 30% more efficient than the older 372's. They need around 14.5 parts air to 1 part fuel, so I don't see how there could a similar amount of oil going through the case

So is the longevity and engine life still going to be similar/comparable between the two designs. What are you seeing.....

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[huskihl]

I was saying a rich mix might enter the lower intake and later mix with the pure air that entered the upper intake bringing it to 14.5:1

It is richer for sure. But fresh mix that went through an xp case and purged the spent exhaust never got ignited but still lubed the piston and bearings. The fresh air that purges an xt never had oil in it. That's why stratos are more efficient

 

[huskihl]

So is the longevity and engine life still going to be similar/comparable between the two designs. What are you seeing.....

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I've only seen a few xt's in my shop with bad bearings, so I don't have much of a sample. But I haven't had any xp's that needed them.

 

[huskihl]

So is the longevity and engine life still going to be similar/comparable between the two designs. What are you seeing.....

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32:1 oil ratio has 50% more oil in it than what was recommended, so that in itself should alleviate the issue if lack of oil is the cause. That's if there's even an issue at all. Could just be coincidental

 

[Gord]

Well all back together an starts and runs good, slap a bar on it and take it along cutting fire wood later, when I got it don't know what caused it but the whole exhaust side of the piston skirt turned into little nuggets, ( wasn't straight gassed) split the cases and no damage to the cases or bearings and very little cleanup on the cylinder, ( even nuggets inside the muffler, the perfect piston failure.