Struggling to get my head around this one

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Struggling to get my head around this one

Postby bonester » Tue Apr 22, 2014 9:54 am

H1turbo2.jpg
H1turbo2.jpg (222.24 KiB) Viewed 5848 times


I'm guessing the limit to boost may be the crank seals???? Reversed cylinders. Guess it would fly? :shock:
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Re: Struggling to get my head around this one

Postby h.b.bear » Tue Apr 22, 2014 12:10 pm

Put some work into it and FMD Wouldn't she scream :shock:
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Re: Struggling to get my head around this one

Postby Gosling1 » Tue Apr 22, 2014 5:40 pm

:shock: :? bizarre. I don't know how that could possibly work.
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Re: Struggling to get my head around this one

Postby Smitty » Tue Apr 22, 2014 10:28 pm

Gosling1 wrote::shock: :? bizarre. I don't know how that could possibly work.


if it actually does.... the turbo lag would be awful.

open the throttle and maybe tomorrow, next month the thing would start to accelerate ... quickly.
In the meantime... grass would grow. :twisted:
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Re: Struggling to get my head around this one

Postby BrettZZR » Wed Apr 23, 2014 10:11 pm

No way! The timing of the ports in the cylinder means that the exhaust port is open way after the intake port closes. This means that there will be no pre-compression of the intake charge, even when the blower is boosting.

Might make a smidge more power because of blown scavenging, but the benefit will be marginal, if any, and the fuel consumption would be monsterous.

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Re: Struggling to get my head around this one

Postby Nelso » Thu Apr 24, 2014 10:19 am

BrettZZR wrote:No way! The timing of the ports in the cylinder means that the exhaust port is open way after the intake port closes. This means that there will be no pre-compression of the intake charge, even when the blower is boosting.

Might make a smidge more power because of blown scavenging, but the benefit will be marginal, if any, and the fuel consumption would be monsterous.

(-8


I agree. I would imagine the turbo might give you a tiny bit of back pressure, but no where near enough for it to work. The turboed two strokes that I have seen on the net that look like they work, all had expansion chambers before the turbo so they still created the back pressure for the exhaust port.
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Re: Struggling to get my head around this one

Postby BrettZZR » Sat Apr 26, 2014 5:44 am

The only two-strokes that can work with boost are those large two-stroke diesels, they are often turbo and supercharged, (think ships, large minimg equipment and huge gen-sets). These can work on boost because they have four valves in the head (ALL exhaust valves) that are timed to be closed when the pressure charge is flowing in...

It's a fundamental problem.

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Re: Struggling to get my head around this one

Postby Nelso » Sun Apr 27, 2014 9:34 am

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Re: Struggling to get my head around this one

Postby Wattie » Sun Apr 27, 2014 4:09 pm

Hmmm Leminz
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