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Author Topic: Here is an interesting concept....  (Read 2799 times)

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Marks DTM Calib

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Here is an interesting concept....
« on: 19 October 2009, 14:50:46 »
.....can anybody guess whats special about this engine type?

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Tony H

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Re: Here is an interesting concept....
« Reply #1 on: 19 October 2009, 14:59:03 »
Surely with differant size cam pullys the valve timing is going to be all over the place :-/
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Nickbat

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Re: Here is an interesting concept....
« Reply #2 on: 19 October 2009, 15:02:28 »
The middle cylinder appears to be designed to act as two cylinders, so maybe it fires twice on the cycle. i.e maybe the firing order would be 1213 or such like. Like a V4 but smaller.

I'm wrong aren't I?  :-[ :-X
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albitz

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Re: Here is an interesting concept....
« Reply #3 on: 19 October 2009, 15:06:49 »
and No.1 and 3 cylinders seem to be missing 2 valves per cylinder,unless its just drawn that way to make it easier to see other details on the drawing. :-/
It looks like one camshaft is going to turn a lot faster than the other,cant think why though,probably something to do with emissions,isnt everything these days. :-/
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Martin_1962

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Re: Here is an interesting concept....
« Reply #4 on: 19 October 2009, 15:07:30 »
Quick guess - 2 stroke with compounding
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Elite Pete

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Re: Here is an interesting concept....
« Reply #5 on: 19 October 2009, 15:07:46 »
Looks like a 2 stroke and 4 stroke combined :-?
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Kevin Wood

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Re: Here is an interesting concept....
« Reply #6 on: 19 October 2009, 15:09:30 »
Hmm. I'd be interested to see the manifolds.

Looks like an idea from the age of steam re-hashed if I'm on the right lines...

Either that or the chap who did the valvegear had had one too many.

Kevin
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Andy H

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Re: Here is an interesting concept....
« Reply #7 on: 19 October 2009, 15:11:58 »
Variation on a two stroke? Single central piston acts as the crankcase would on a two stroke but the engine doesn't have to run a total loss oiling system and the piston rings don't get chewed up due to transfer ports in the side of the barrel?

Thinking a bit harder.....
The two outer pistons will behave like a (japanese) 4 stroke parallel twin and the big central piston will force charge air into alternate pistons.
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Tony H

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Re: Here is an interesting concept....
« Reply #8 on: 19 October 2009, 15:13:13 »
Looking at the crank arrangement it alternates between fireing on the two outside cylinders at the same time and firing on the centre cylinder.
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Kevin Wood

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Re: Here is an interesting concept....
« Reply #9 on: 19 October 2009, 15:13:27 »
Quote
Quick guess - 2 stroke with compounding

I think you're half way there..  :P

Kevin
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Kevin Wood

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Re: Here is an interesting concept....
« Reply #10 on: 19 October 2009, 15:14:30 »
This is what it brought to mind for me...

http://en.wikipedia.org/wiki/Steam_engine#Multiple_expansion_engines

Kevin
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Martin_1962

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Re: Here is an interesting concept....
« Reply #11 on: 19 October 2009, 15:14:49 »
Ideas

Cylinder 2 is the compressor, 1 & 3 are the power cylinders

or

Cylinder 1 and 2 are high pressure and cylinder 2 low pressure
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Kevin Wood

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Re: Here is an interesting concept....
« Reply #12 on: 19 October 2009, 15:15:56 »
Quote
Ideas

Cylinder 2 is the compressor, 1 & 3 are the power cylinders

or

Cylinder 1 and 2 are high pressure and cylinder 2 low pressure

Looking at how the cams are arranged I'd say the latter.  :y

Kevin
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Kevin Wood

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Re: Here is an interesting concept....
« Reply #13 on: 19 October 2009, 15:20:00 »
Hmm. It's actually rather clever. The efficiency of a high compression ratio, without the losses or the detonation issues.

Kevin


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albitz

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Re: Here is an interesting concept....
« Reply #14 on: 19 October 2009, 15:21:40 »
Quote
Looks like a 2 stroke and 4 stroke combined :-?
A 2 stroke wouldnt have a pair of valves per cylinder though. :-/
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