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Author Topic: Over-Head Camshafts Why???  (Read 6369 times)

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Entwood

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Re: Over-Head Camshafts Why???
« Reply #60 on: 26 February 2008, 21:28:34 »

Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?

There have been several successful 2 stroke cars ... Saab did them for many years.

http://www.motorbase.com/engine/by-id/948549497
« Last Edit: 26 February 2008, 21:29:23 by entwood »
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zippo

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Re: Over-Head Camshafts Why???
« Reply #61 on: 26 February 2008, 21:30:43 »

Quote
Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?

There have been several successful 2 stroke cars ... Saab did one for many years.
http://www.motorbase.com/engine/by-id/948549497
irrc didn't it win the RAC rally back when it was a proper rally
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albitz

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Re: Over-Head Camshafts Why???
« Reply #62 on: 26 February 2008, 21:33:20 »

Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?
i think they produce plenty of power but not much torque,ok an a bike but no use pulling the weight of a car.omissions would also be a big problem these days.
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Debs.

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Re: Over-Head Camshafts Why???
« Reply #63 on: 26 February 2008, 21:45:50 »

Quote
Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?

What about he Trochoidal-Wankel rotary engine (RX7/8); is that 2 or 4 stroke? (or maybe it`s neither)
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zippo

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Re: Over-Head Camshafts Why???
« Reply #64 on: 26 February 2008, 21:50:03 »

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Quote
Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?

What about he Trochoidal-Wankel rotary engine (RX7/8); is that 2 or 4 stroke? (or maybe it`s neither)
not a clue but i do know they cost a packet to rebuild
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Marks DTM Calib

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Re: Over-Head Camshafts Why???
« Reply #65 on: 26 February 2008, 21:58:28 »

Quote
Quote
Quote
Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?

What about he Trochoidal-Wankel rotary engine (RX7/8); is that 2 or 4 stroke? (or maybe it`s neither)
not a clue but i do know they cost a packet to rebuild

Its neither as there is not stroke because its a rotary action and its also difficult to determine the cc as its a swept area.......had an RX7 which I nearly set fire to because I parked it on some dry grass and the ceramic exhaust gets rather hot!
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Golfbuddy

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Re: Over-Head Camshafts Why???
« Reply #66 on: 26 February 2008, 22:12:48 »

Quote
Quote
Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?

What about he Trochoidal-Wankel rotary engine (RX7/8); is that 2 or 4 stroke? (or maybe it`s neither)

 ;D ;D ;D

Well, somebody had to.  ::) ::)
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Debs.

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Re: Over-Head Camshafts Why???
« Reply #67 on: 26 February 2008, 22:23:02 »

Quote
Quote
Quote
Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?

What about he Trochoidal-Wankel rotary engine (RX7/8); is that 2 or 4 stroke? (or maybe it`s neither)

 ;D ;D ;D

Well, somebody had to.  ::) ::)
:o ....and it would be me woudn`t it?  ::)
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Pitchfork

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Re: Over-Head Camshafts Why???
« Reply #68 on: 28 February 2008, 15:53:05 »

Quote
Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?
i think they produce plenty of power but not much torque,ok an a bike but no use pulling the weight of a car.omissions would also be a big problem these days.
With modern technology I'm sure that emission issues would be easily solved & if the torque was so bad, how come the Saabs of old were good enough to win rallies???
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Kevin Wood

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Re: Over-Head Camshafts Why???
« Reply #69 on: 28 February 2008, 17:12:04 »

Quote
What about he Trochoidal-Wankel rotary engine (RX7/8); is that 2 or 4 stroke? (or maybe it`s neither)

A mate of mine has one in a Westfield. On the brief occasions when it works, it's louder idling than mine is at full chat.  ;D

Kevin
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Kevin Wood

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Re: Over-Head Camshafts Why???
« Reply #70 on: 28 February 2008, 17:14:26 »

Quote
Quote
Quote
Ah Ha!!
But 2 strokes don't have valves so why not 2 stroke engines in cars?
i think they produce plenty of power but not much torque,ok an a bike but no use pulling the weight of a car.omissions would also be a big problem these days.
With modern technology I'm sure that emission issues would be easily solved & if the torque was so bad, how come the Saabs of old were good enough to win rallies???

I would have thought direct petrol injection would help 2 stroke engines get back into favour. After all, the main problem with them is that the fuel saunters into one port and out of the other unburnt and makes a real mess of the emissions. If you inject fuel after the ports have closed it should work much better.  :-/

Kevin
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hotel21

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Re: Over-Head Camshafts Why???
« Reply #71 on: 28 February 2008, 19:20:59 »

The large 2 stroke diesels I used to work on were direct injection with a pushrod inlet valve and ported exhaust to a tuned exhaust pipe feeding a turbocharger...

Only real problem was the two metre stroke length....  Would need a large bonnet bulge to accomodate it in a car, methinks.   ;)
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Martin_1962

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Re: Over-Head Camshafts Why???
« Reply #72 on: 28 February 2008, 19:25:08 »

2 stroke Diesels are interesting - I personally like Napier D18s

18 cylinders 36 pistons 3 cranks found in pairs in Britains most powerful Diesel loco
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Kevin Wood

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Re: Over-Head Camshafts Why???
« Reply #73 on: 28 February 2008, 21:43:30 »

Quote
The large 2 stroke diesels I used to work on were direct injection with a pushrod inlet valve and ported exhaust to a tuned exhaust pipe feeding a turbocharger...

Only real problem was the two metre stroke length....  Would need a large bonnet bulge to accomodate it in a car, methinks.   ;)

I think the shock absorbers would take a bit of a battering too!

Could mount it fore-aft horizontally like an ond tractor and watch it rocking back and forth at the traffic lights!

Kevin
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Debs.

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Re: Over-Head Camshafts Why???
« Reply #74 on: 28 February 2008, 22:32:52 »

Quote
2 stroke Diesels are interesting - I personally like Napier D18s

18 cylinders 36 pistons 3 cranks found in pairs in Britains most powerful Diesel loco
Heavenly sounds on rails: A Deltic......or 2nd. a Brush-Sulzer 47 'wide-open'....(Sighs!)  8-)
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