2 stroke V8?

MetalCraftSolved

MetalCraftSolved

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Joined
Jun 20, 2010
Location
NC


Looking for some motor guys to chime in. Seems like a wild idea for a buggy.

So what's the story? What kind of modifications would be needed to make a 4, 6, or 8 cylinder, 2 stroke boat motor ready to mount horizontally? Would it work? Pro's and con's?
 
The first reasons that would make me not want to run one:

They're freaking loud
You'd have to mix oil which costs more than straight gas
They smoke a lot
They like to be ran wide open
Couldn't get the torque out of a 2 stroke down low like you can with a 4 stroke
You may go through a lot of spark plugs
An outboard cooling system would be a pain in the ass to turn in to a closed system (at least I think it would be)
People around you would likely complain :D


If you wanted to run a 2 stroke, I'd go get an old 2 stroke Detroit diesel :driver: A 6V53 would be a good fit!
 
Story is it would be just like a 2 stroke dirtbike... Not the best thing for a buggy. If you search on pirate,a long-ass time ago JR Reynolds--with the fatcity bronco went to build a buggy with a ~$20k mercruiser race 2 stroke on it's side mated to a powerglide or c4. The up-side would be oil pressure isn't a factor and they make amazing power for the weight, down-side would be listening to it and in a buggy, changing plugs ever 30 minutes. Besides, this is 2013...a modest lsX motor would destroy that thing in just about every way but size and running upside down.
 
JR runs in the desert. Didn't know he ever went that route? But look at this idea as a bare bones single seater.... Super light short run, show time hill killer. I want to know the mods involved.... Bout to look at JR's stuff.
 
Delete the oil pressure and involve the amazing power it brings???? Dayem!

I know 2 strokes burn up plugs..... But Why do y'all think the plugs would burn up so fast? Been running a KX 250 for years and only fouled the plug once.
 
Loganwayne said:
Something else to think about is the re build time on the motors. Most 2 stroke dirt bikes call for a rebuild ever 20-25 hours tops.
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Sounds a bit extreme. At the monent, my Kx top end is burnt after years of hell, but hard to believe these boat motors can't take some abuse.
 
David G 4x4 said:
Haven't done much research on this yet, but I'm guessing I would enjoy a 120 horsepower 2 stroke motor.
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Why would you want a 120 hp 2 stroke when you could have 4 or 500 HP easy from a 4 stroke v8? Its not that it wouldn't be cool or interesting to do but unless you just have money to burn the best bang for your buck would be a traditional v8 choice. Lots of power, lots of torque, in a broad power band can be had pretty cheap in a traditional v8. The 2 stroke is gonna make good power but not down low in the rpm range and the power band is very narrow to get the most out of it. But if you wanna do it and have the money then I will watch the videos lol.
 
Ok I have to say it may not be the most for ur money, but think of it is way. Get on a 450r Honda 4 wheeler ride it then get on a 250r Honda 4 wheeler. See witch one has u saying oh sh*t when u climb off of it. Yes it would cost alot more money and it wouldn't be a motor for every trail bit damn wouldn't it be fun!
 
pcole0920 said:
Ok I have to say it may not be the most for ur money, but think of it is way. Get on a 450r Honda 4 wheeler ride it then get on a 250r Honda 4 wheeler. See witch one has u saying oh sh*t when u climb off of it. Yes it would cost alot more money and it wouldn't be a motor for every trail bit damn wouldn't it be fun!
Click to expand...

Exactly. A 400hp foxbody mustang witha 347 stroker is going to be more of a hoot than a 550hp Mercedes SL63 AMG.
 
Or an LSX Willys Jeep :D
 
Oh ok, let me explain.

I've drove plenty of super capable race rigs and high dollar toys. I don't even drive them anymore, I just spectate from a distance. Don't get me wrong, I love it and it's my passion, but I tear shit up quicker than you can say Day'em! Other than schooling, it's the biggest reason why I understand how to build them right and tune them right.

With that said - I enjoy the shit out of underdog rigs. Small, high rev motors - roastin off 4 small tires will suit me beyond fine. Comes with a bigger driving challenge - Doing things that can't be done with cheap shit is my ultimate rush, and OH so much cheaper. Don't know how many 22r cam shafts I've rounded off into junk, but would you believe I've NEVER, EVER broke a stock Toyota axle. Telling me I can't do something with a Toyota truck, might just give me a boner. Probably have more fun in a shit box than most other rigs.

Don't want a 500 horsepower money pit. Want a peppy, tight package, high rev motor that will compliment a custom built buggy and my suspension techniques. All with using Toyota stuff.

I live at High Rock Lake, and I'm sure there are tons of boat motors around here not being used. Looking to build a buggy in six months or a year from now. Still haven't heard any details on how to set one of these motors up, and that's what I'm after.

I thought I would get some setup info thrown at me but, my biggest question would be? Will the boat carbs work? Obviously, the motor is going to be mounted horizontally. Will I have to fabricate an intake manifold for the boat carbs? Should I fabricate an intake manifold for a weber or two? Will a Weber work with mixed fuel? I don't know, I fucking hate motors. :flipoff:
 
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And someone explain to me why it would be really expensive. Yeah it takes 2 cycle oil.... o_O If I find a running boat motor for cheap that doesn't use a complicated wiring harness and maybe needs minor work? Can fabricate anything for it that I can halfway understand?
 
The boat motors I have messed with didn't have a carburetor like your probably thinking, they dont have a bowl or float level. Its a diapragm inside that is actuated by the vacuum pulses from the engine the faster its revved the faster the diapragm pumps, the more fuel you get. You could probably lay the motor down and it would be just fine. Now that we know why your wanting to use a 2 stroke you will probably get more help, at first I didn't understand "why" you would want to do it but now it makes sense.
 
lightweight...power...torque...

Look up a Scat V4

Maybe one like this?:rockon:
awww.stu_offroad.com_misc_scat_scat_2.jpg


This dude aint playin!
 
Nah, it wouldn't work. Think about a drag race motor in a buggy, and you'll begin to get a glimpse of the picture.

With the 2 stroke, you'd have to wind the snot out of it to get any power. Kinda like your KX. You won't find any of them racing in the woods. You can argue that the new 2 stroke KTM's work well in the woods, but a marine engine operates with no need to develop power at idle.

If you were going to try to use it as a go-fast rig, I think it'd be very interesting. Years ago when I was into roundy-round racing, an old timer was contemplating doing a rotary valved 4 stroke. IMHO, that'd be killer as it would eliminate valve float.

One thing you might look at is the old Wankel rotary (think twin-turbo'd RX7). Hammer down!!!
 
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