Suzuki gt380 in my past.E_bug wrote:A wartburg motor comes to mind, 3 cyl eastern germany vehicle lol. Had a nice power band but it was but ugly.
Rotary is the closest thing to 2 stroke powerband wise and oil consumption wise
Any news on the project.?
I must be getting old. 2 stroke subject brought back memories of a yamaha rd250 , kawasaki kr1 . Now they are even barely street legal..
Ahh the smell of bell ray oil on my jacket....
two stroke VW
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helowrench
- Posts: 1925
- Joined: Wed Aug 11, 2004 6:20 am
Re: two stroke VW
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ruben
- Posts: 21
- Joined: Wed Mar 07, 2012 4:13 am
Re: two stroke VW
what if you weld the vent holes everybody is opening up for "case flowing" around the no2 main bearing as to create a 3 compartment case (of witch one is the cam gear housing)
feed these via a reed valve with intake air, and add a set of outputs to the case roof
the pistons in a compartment move in and out at the same time thus creating a pressure behind the pistons thus flushing out the spent gasses, add an injector in the runner to the head.
will require a dry sump system and a way of separating out most of the oil (spatter plate of sorts)
double the cam speed or the number of lobes and you've got the base of a 2 stroke 4 pot engine without modding the head's / cylinders.
rpm wise the valve train is the limiting factor 5000 rpm tt =10.000 rpm 4 stroke.
afr sensor will not like the oil or the air flushed out of the ex valves, but the sensor may outlive the cam anyway...
some body get me a 1300 dp stat......
feed these via a reed valve with intake air, and add a set of outputs to the case roof
the pistons in a compartment move in and out at the same time thus creating a pressure behind the pistons thus flushing out the spent gasses, add an injector in the runner to the head.
will require a dry sump system and a way of separating out most of the oil (spatter plate of sorts)
double the cam speed or the number of lobes and you've got the base of a 2 stroke 4 pot engine without modding the head's / cylinders.
rpm wise the valve train is the limiting factor 5000 rpm tt =10.000 rpm 4 stroke.
afr sensor will not like the oil or the air flushed out of the ex valves, but the sensor may outlive the cam anyway...
some body get me a 1300 dp stat......
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Jadewombat
- Posts: 1447
- Joined: Sat Jun 22, 2002 12:01 am
Re: two stroke VW
Sorry, but I don't really understand the purpose of this other than a science project. If it's extremely high revs in a flat-4 aircooled VW, why not just follow the example of a F1 engine? Seriously. An N/A 2.0L V8 F1 engine which has 10-12 oil pumps, 2:1 bore to stroke ratio, gains revs at 20K RPMs per second to rev. to 18K, and makes about 850hp and 200 ft./lb.
Even if double the revs. of a VW engine could be achieved, putting it in the 9000-10000 rev. (which some drag race engine do--although for very short amounts of time during a run), a pushrod engine is going to have all sorts of valve float at those revs. Not the sort of engine that could be driven on a road course much less the street.
I'm in agreement, a Mazda rotary engine is probably a better choice if a high-revving 2 stroke engine in a V-dub is the goal. An engine builder I knew a few years ago in Arizona who did racing versions of these motors said some of them he built didn't start to make power until 12K.
Even if double the revs. of a VW engine could be achieved, putting it in the 9000-10000 rev. (which some drag race engine do--although for very short amounts of time during a run), a pushrod engine is going to have all sorts of valve float at those revs. Not the sort of engine that could be driven on a road course much less the street.
I'm in agreement, a Mazda rotary engine is probably a better choice if a high-revving 2 stroke engine in a V-dub is the goal. An engine builder I knew a few years ago in Arizona who did racing versions of these motors said some of them he built didn't start to make power until 12K.
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joosep
- Posts: 446
- Joined: Mon Aug 15, 2011 12:10 pm
Re: two stroke VW
If U ask why then its not for U 
Some guys do things just because they can.
It gives something (With my english its hard to explayn what)
For me it just looks like relly cool project to make something really different and extra high revs and power would be just as an extra.
Think like U take a stock 1600 engine....U lighten the rods and pistons...weld counterweights throw away all what limits your spinning speed (Cam, lifters, pushrods, valves) Throw away bad breathing stock heads with awful valves...just make a new ones (really easy work when U have seen 2 stoke engine combastion chamber) Eaven stock oilpump would now be enough when cam dont take half oil away) U don't need extra sump cause U can add more oil to the case now...cut some holes to stock barrels and veld new intake and exhaust (just take some motorcycle engine for a measurements) and woilaaa U have something U made yourself....it can spin to the moon and make 2 or 3 times more power than it did before.....nothing fancy and expensive in it.
Thats where I was when I came an idea that somethin has to push the air into the barrel and U cant use the case for that (oil in there and displacemen is the same, cause when 2 pistons go up then 2 come down) U can use a compressor to press the air in but for me it ruins all
Some guys do things just because they can.
It gives something (With my english its hard to explayn what)
For me it just looks like relly cool project to make something really different and extra high revs and power would be just as an extra.
Think like U take a stock 1600 engine....U lighten the rods and pistons...weld counterweights throw away all what limits your spinning speed (Cam, lifters, pushrods, valves) Throw away bad breathing stock heads with awful valves...just make a new ones (really easy work when U have seen 2 stoke engine combastion chamber) Eaven stock oilpump would now be enough when cam dont take half oil away) U don't need extra sump cause U can add more oil to the case now...cut some holes to stock barrels and veld new intake and exhaust (just take some motorcycle engine for a measurements) and woilaaa U have something U made yourself....it can spin to the moon and make 2 or 3 times more power than it did before.....nothing fancy and expensive in it.
Thats where I was when I came an idea that somethin has to push the air into the barrel and U cant use the case for that (oil in there and displacemen is the same, cause when 2 pistons go up then 2 come down) U can use a compressor to press the air in but for me it ruins all
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PhillipM
- Posts: 395
- Joined: Sun Jan 10, 2010 7:04 pm
Re: two stroke VW
Maybe on using some oil, but I beg to differ on the powerband, our old RX-8 motor had gobs of torque right from idle to the redline compared to most A/C motors.E_bug wrote: Rotary is the closest thing to 2 stroke powerband wise and oil consumption wise
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Jadewombat
- Posts: 1447
- Joined: Sat Jun 22, 2002 12:01 am
Re: two stroke VW
Contine re-inventing the wheel my friends, maybe one day it will be rounder...
http://forums.pelicanparts.com/porsche- ... 911-a.html
http://forums.pelicanparts.com/porsche- ... 911-a.html
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donbarnes1
- Posts: 13
- Joined: Sun Apr 06, 2014 12:20 pm
Re: two stroke VW
About a year or so ago there was a write up in a car magazine (maybe Hot Rod?)about an all new little V-4 someone was developing and they put one of the prototypes in a Manx style buggy. Anyone remember it or what it was called? Would like to Google and see what ever came of it..