1128 Series Month

[Adirondackstihl]

Yeah! That's exactly what I was thinking of doing!

Just a little bit of time with the ol' dremel......probably get slightly better gas flow?

No fuel flow there.
Was actually trimmed to clearance the piston skirts.

 

[MattG]

Was actually trimmed to clearance the piston skirts.

Let me get more up to speed, what piston was it? Presumably not a stock 1128 series one?

No fuel flow there.

I suppose that there must be marginal turbulence caused as the piston descends compressing the charge underneath the skirt......but it's probably negligible. I guess the steps don't effect transfer port flow since those ports are of the closed type.

Sorry to dwell on it....me and a pal just noticed the step in the casings...and thought "what's all that about" and "does it effect anything"....

 

[Adirondackstihl]

Let me get more up to speed, what piston was it? Presumably not a stock 1128 series one?


I suppose that there must be marginal turbulence caused as the piston descends compressing the charge underneath the skirt......but it's probably negligible. I guess the steps don't effect transfer port flow since those ports are of the closed type.

Sorry to dwell on it....me and a pal just noticed the step in the casings...and thought "what's all that about" and "does it effect anything"....

Stock 046/460 piston

 

[mdavlee]

272 wiseco works good

 

[MattG]

Stock 046/460 piston

So in other words, cutting back that step is essential when building a 044 / 460 hybrid (i.e. 044 cases/ 460 top end) ?

 

[Adirondackstihl]

So in other words, cutting back that step is essential when building a 044 / 460 hybrid (i.e. 044 cases/ 460 top end) ?

Essentially, but not in all cases.
The first one I built, I did not clearance the case.
The pics above are of DDaves hybrid I built and I felt it was a necessary precaution to do this on his saw.

 

[T.Roller]

So in other words, cutting back that step is essential when building a 044 / 460 hybrid (i.e. 044 cases/ 460 top end) ?

No. I didn't do it when I built my hybrid. Every saw is different tho

 

[Ron660]

272 wiseco works good

Racing or worksaw piston?

 

[mdavlee]

Racing or worksaw piston?

I've used it for a work saw some since it was one of 2 runners for a little while.

 

[Ron660]

I've used it for a work saw some since it was one of 2 runners for a little while.

Notice any advantage in power vs stock/OEM piston?

 

[mdavlee]

Notice any advantage in power vs stock/OEM piston?

Wider skirts, no cutting the base, single ring, a little lighter than oem. I did have to put windows in the piston and that took more time than the porting. Very simple mods to the jug and it is faster than anything I have here now in small stuff and was just a tick behind the ported 661 and 385 in bigger wood.

 

[paragonbuilder]

Wider skirts, no cutting the base, single ring, a little lighter than oem. I did have to put windows in the piston and that took more time than the porting. Very simple mods to the jug and it is faster than anything I have here now in small stuff and was just a tick behind the ported 661 and 385 in bigger wood.

Mike how is an oem 272 piston in these?


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[mdavlee]

Mike how is an oem 272 piston in these?


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Never tried one

 

[Deets066]

Mike how is an oem 272 piston in these?


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It's been on my list

I have the piston, just need the time

 

[Adirondackstihl]

 

[MattG]

Essentially, but not in all cases.
The first one I built, I did not clearance the case.
The pics above are of DDaves hybrid I built and I felt it was a necessary precaution to do this on his saw.

No. I didn't do it when I built my hybrid. Every saw is different tho

Thanks for these replies people. Hopefully my new OEM 460 P+C arrives today. So I'll be able to see for myself

 

[Deets066]

Thanks for these replies people. Hopefully my new OEM 460 P+C arrives today. So I'll be able to see for myself

Just be cautious to not fill your bearings with shavings if you decide to grind it out.

 

[Redfin]

Just be cautious to not fill your bearings with shavings if you decide to grind it out.

Soooo serious, we cant be bothered wiff dat.

 

[Deets066]

Soooo serious, we cant be bothered wiff dat.

Mornin John

 

[Moparmyway]

View attachment 78257

The dude flying through the air ..........