DIY Porting for an idiot

Rich H · Post by **Rich H** » Sun Aug 13, 2006 7:59 pm

So its done. Please see here for the "drama" when it was fitted...
http://www.scottishelises.com/phpbb/vie ... php?t=3059

The head works fine. THe power has moved up the rev range significantly and the original zorst manifold is crap and needs eplacing ASAP!

We'll see with a RR session soon

GregR · Post by **GregR** » Mon Aug 14, 2006 8:56 am

Rich, great news mate

Looking forward to seeing her on Friday.

Rich H · Post by **Rich H** » Mon Aug 14, 2006 9:00 am

Nothing to see apart from the VVC manifold!

I'm about to go for a mini run and see how I get on. I haven't exceeded 4.5k revs yet....

Pretty sure the cams aren't optimised as yet too seeing as we bodged it....

MacK · Post by **MacK** » Mon Aug 14, 2006 12:45 pm

Rich, maybe you went for the wrong option, you could have tried this instead

http://www.new4stroke.com/ (picked from Sel#c, and a seemingly mad Polish guy

)

Thoughts please.

Post by **Shug** » Mon Aug 14, 2006 12:48 pm

MacK wrote:Rich, maybe you went for the wrong option, you could have tried this instead

http://www.new4stroke.com/ (picked from Sel#c, and a seemingly mad Polish guy )

Thoughts please.

He's barking, but it's a sound principle. Would imagine it would be quite complex to life components and therefore keep on top of maintenance....

Still - like I say - sound engineering principle.

Rich H · Post by **Rich H** » Mon Aug 14, 2006 12:52 pm

I looked into that it's a very intersting design, no valves as such and no lost power driging the valve train. Problem seems to be that the combustion chamber is effectivly on the move so it will mess up any flame fronts and will get very messy. Even with the right mix I doubt you would ever get a good burn.

Interesting but ultimatly destined for the patents back office I suspect, which is a shame for a good idea. Also see the stuff on rotary valving, no reciprical motion, seems interesting and alot more possible with modern cleaner burning fuels and the original sooted up too quickly. Curiously investigated by Lotus at one tie supposedly...

What I want is a Wankle Rotary. Now that would be fun. The RX-8 lump is supposedly only 45kg and has a rev limit of 9k as standard... <BG>

thinfourth · Post by **thinfourth** » Mon Aug 14, 2006 2:01 pm

MacK wrote:Rich, maybe you went for the wrong option, you could have tried this instead

http://www.new4stroke.com/ (picked from Sel#c, and a seemingly mad Polish guy )

Thoughts please.

Arrrgh slide valves

No advantage yes you have more piston area but you still have the same pressure expanding into a expanding volume so can't see the advantage

Down sides are the very tall head and engine and overly complicated design and then how the hell are you going to get decent lubrication of the top two pistons. Oh and the combustion chamber looks like a pap design

If you are going down the opposed piston route do it proper and get a turbo charged 2 stroke like a deltic or what ever they called those made triangular engines used in trains.

As for rotary valves

you worked with them i have

mac · Post by **mac** » Mon Aug 14, 2006 2:15 pm

Got it in one Paul - we used to use Deltic engines in the late 70's & early 80's.

I'm not a trainspotter but I could hear a deltic coming towards us

Mac

Rich H · Post by **Rich H** » Mon Aug 14, 2006 3:04 pm

Wankle option then? Nice RX-8 or RX-7 lump? Box may be interesting...

Rich H · Post by **Rich H** » Mon Aug 14, 2006 3:30 pm

2 Stroke diesel anyone:

Maximum power: 108,920 hp at 102 rpm
Maximum torque: 5,608,312 lb/ft at 102rpm

I think I may need some new tyres first....(and it weighs 2300 tonnes!)

Post by **Shug** » Mon Aug 14, 2006 3:34 pm

RICHARDHUMBLE wrote:Wankle option then? Nice RX-8 or RX-7 lump? Box may be interesting...

It's WankEL....

And don't you know that Mazda have called it Renesis in the RX8 (presumably because of the purile minds of car enthusiasts)

Rich H · Post by **Rich H** » Mon Aug 14, 2006 3:40 pm

I doesn't matter how you dress it up it is still a WankEL.

I had discussions with a guy a while ago who had some experience of Wankels in aero applications. apparently if they are leaned right back they run fantastically.

As the combusion chamber is on the move the fuel is flung out to the edge creating a rich zone around the plug (For ease of igntion) the leans off towards the middle creating the best of both worlds. However the emissions (And exhaust temp) are astronomical.... And they still drink oil at a ridiculous rate. Revs are artificially restricted with the only limiting factor being the speed of the induction/exhaust scavange

All second hand over a pint or twelve...

/geek

Rich

Post by **Shug** » Mon Aug 14, 2006 3:47 pm

RICHARDHUMBLE wrote:I doesn't matter how you dress it up it is still a WankEL.

I had discussions with a guy a while ago who had some experience of Wankels in aero applications. apparently if they are leaned right back they run fantastically.

As the combusion chamber is on the move the fuel is flung out to the edge creating a rich zone around the plug (For ease of igntion) the leans off towards the middle creating the best of both worlds. However the emissions (And exhaust temp) are astronomical.... And they still drink oil at a ridiculous rate. Revs are artificially restricted with the only limiting factor being the speed of the induction/exhaust scavange

All second hand over a pint or twelve...

/geek

Rich

The RX8 has changed port positions to the sides of the chamber, not the edges IYSWIM. Supposed to ease the rotor tip wear (as it's not getting chiselled off on the port edges) and therefore the oil use.

They still drink it though and I suppose there will be flow issues with the charge arriving and having to do a 90 deg turn in the chamber....

The sound of the LM Mazda 787B (4 rotor twin turbo maniac 1991 Group C car) still makes me wince

Rich H · Post by **Rich H** » Mon Aug 14, 2006 3:53 pm

TBH I thought they all had valves in the side plates.

How about a gas turbine?

Post by **Shug** » Mon Aug 14, 2006 4:04 pm

RICHARDHUMBLE wrote:TBH I thought they all had valves in the side plates.

How about a gas turbine?

How about learning to use the revs you've got?