Echo stratocharging?

[Okie294life]

I looked at a large echo 7310, I believe and they aren’t stratocharged. How is echo getting away with this? Are they running cats or something in all their equipment? It seems almost anything new you look at past mid 2000’s has an airhead on it.

 

[huskihl]

I don’t believe Echo uses strato charging on any models. Not entirely certain how they get away with it.

 

[huskihl]

If you’re interested in that particular model, there’s a new one that I ported for sale on O p E. It runs really well

 

[farmguywithasaw]

If you’re interested in that particular model, there’s a new one that I ported for sale on O p E. It runs really well

My cs400 had a big ol cat in the muffler. She gone now lol

 

[huskihl]

My cs400 had a big ol cat in the muffler. She gone now lol

Might be good design to get things to pass the sniff test, but they sure add unwanted heat to the system.

 

[Piston Skirt]

I looked at a large echo 7310, I believe and they aren’t stratocharged. How is echo getting away with this? Are they running cats or something in all their equipment? It seems almost anything new you look at past mid 2000’s has an airhead on it.

The answer is swirl control. As long as you can burn most of the fuel without losing the part of unburnt charge into the muffler, you’re OK.
Strato technology is a quick way to replace the unburnt part with fresh air - the harder trick is to position it right and avoid mixing.
As for stratified models - some Yamabiko engines have it - PB-500, CS-550, CS-4510, CS-4310, CS-3510, PB-8010, PB-9010.
Their non strato engines utilize asymmetric ports to compensate for temperature differences, discharge-cut and different velocity ports to aid swirling. Long stroke is there also for better combustion efficiency (=emissions).

 

[ballisticdoughnut]

The EPA has a points system in place for small gasoline engines. For every piece of equipment that meets emissions standards the manufacturer is given a certain number of points. Think of it as a form of currency. The manufacturer can then use or "spend" these points to bring equipment to market that doesn't meet emissions standards. That's how it was explained to me anyway.

 

[Piston Skirt]

The EPA has a points system in place for small gasoline engines. For every piece of equipment that meets emissions standards the manufacturer is given a certain number of points. Think of it as a form of currency. The manufacturer can then use or "spend" these points to bring equipment to market that doesn't meet emissions standards. That's how it was explained to me anyway.

That’s right. As for ECHO you can look up for the models which are sold in Europe - they are passing everything as there is no crediting system.
In simple terms there is roughly one “credited” model - 620P which has fully compliant counterpart in Europe 621SX.
7310 passes all limits like all models above 50ccs without catalysts.

 

[user 172763]

The EPA has a points system in place for small gasoline engines. For every piece of equipment that meets emissions standards the manufacturer is given a certain number of points. Think of it as a form of currency. The manufacturer can then use or "spend" these points to bring equipment to market that doesn't meet emissions standards. That's how it was explained to me anyway.

Do you mean to be California compliant? That standard will not be around for long since Newsome is outlawing all gasoline small equipment including lawn mowers. I am so glad I don't live there.

 

[ballisticdoughnut]

Do you mean to be California compliant? That standard will not be around for long since Newsome is outlawing all gasoline small equipment including lawn mowers. I am so glad I don't live there.

As far as I know that's for the USA in general, I wouldn't be the least bit surprised if CA had their own standards.

 

[Piston Skirt]

As far as I know that's for the USA in general, I wouldn't be the least bit surprised if CA had their own standards.

CARB is the name.
https://ww2.arb.ca.gov/homepage

 

[user 172763]

Ha ! just had a thought about that that made me laugh. I hope Elon Musk places a surcharge on Tesla's shipped to Ca. from Tx.

 

[hwrdpromac7900]

The EPA has a points system in place for small gasoline engines. For every piece of equipment that meets emissions standards the manufacturer is given a certain number of points. Think of it as a form of currency. The manufacturer can then use or "spend" these points to bring equipment to market that doesn't meet emissions standards. That's how it was explained to me anyway

Did Mr. carbon credit Al Gore come up with that?

 

[bwalker]

The answer is swirl control. As long as you can burn most of the fuel without losing the part of unburnt charge into the muffler, you’re OK.
Strato technology is a quick way to replace the unburnt part with fresh air - the harder trick is to position it right and avoid mixing.
As for stratified models - some Yamabiko engines have it - PB-500, CS-550, CS-4510, CS-4310, CS-3510, PB-8010, PB-9010.
Their non strato engines utilize asymmetric ports to compensate for temperature differences, discharge-cut and different velocity ports to aid swirling. Long stroke is there also for better combustion efficiency (=emissions).

If you are still pushing the exhaust out with fresh mixture I can't see how emmissions can't be an issue.