Strokers

[DeathBySnuSnu]

Matman:

I really like my stroker motor. It is not much larger than your 1915. It is a 2110, a 90.5 bore and 82 stroke.

It once was in a beetle and compared to a friends 1915 in a beetle it was a torque monster. The 1915 ran good and strong but the added stroke of the 2110 made mine a wheel toter.
Quite a few years went by with the 2110 sitting in my shed. Then I had the bright idea to build a trike. So I freshened it up and put a much smaller cam in it. I do not run Engle cams, I prefer a different lobe center than what they are made at. But my small cam closely compares to a W130. It sounds like a lot of cam but it dont bog at low rpm like a stock stroke. You definately know when the can comes in though.

The downside? You are adding a lot of stress to the engine case and bearings. I replace bearings every 20k to 30k miles. If you are looking for long term durabilty with little maintainence then do not go overly big. A counter weighted balanced crank of a near stock stroke does wonders for bearing longevity.

But after saying all that.... I would clearance the case and put an 82mm crank in it. 2276cc Mmmmmmmm. 94mm jugs did not exist when I first built mine in 1981 (I think). 90.5 were thought to be more durable than 92 jugs. Next time it is apart it is going to get cut for 94's.

[matman1972]

I really like the 1915 that's in the trike now. We had a guy named Ron Hunter who lived near us build this one. I've built many types of engines, but Ron was an expert, and we were busy building the frame. The engine in the bug had a cracked block, so we just had Ron start off with a new welded, bored block.
I'd like to build a stroker, but am not sure if I want to put it in the trike. Although I would like the extra pickup , I like the smoothness of mine on long trips. I have about 25k on it, and it still purrs like new.
My daughter wants to take an older bug and build a Baja for the trails near here. That would be a good candidate for the stroker.

[DeathBySnuSnu]

I hear ya. Mine is a toy, I dont go far on it. I am always at work.
Sound like a plan and fun to boot.
But the stroker in the trike would be wheelie time! Mine wheelies pretty strong and it has all the weight forward.

[matman1972]

I can wheelie mine, but then again, I have my engine in the rear. We used 3/8" walled 2 1/2" tubing for the entire front frame on mine, and my battery is all the way forward, along with a fairly heafty driver's floorboard so I have to actually try to bring mine up. If I'm on an onramp in second, an overaplication of throttle will bring the front wheel off the ground. And of course, first gear from a standstill is no problem, but I have enough front weigjt so it doesn't become a problem and catch me off guard.
I'm running a pretty mild scat 35, counterbalanced stock crank, I believe .40 heads, and a weber two barrel.
My next step is to do a good setup of the carb. Ron set it when it was built, but it is running a little rich with a slight hesitation off idle.

Back on topic, I need a winter project for next year, so I'm thinking a new motor would keep me busy.

[matman1972]

I hear ya. Mine is a toy, I dont go far on it. I am always at work.
Sound like a plan and fun to boot.
But the stroker in the trike would be wheelie time! Mine wheelies pretty strong and it has all the weight forward.

One of the benifits of being a teacher. Nice vacations for long trips. I drove my ural 650 from Atlanta to Peoria last summer. That was an adventure. It was the only trip I ever did at 45 mph, rebuilding the bike the whole way.

[DeathBySnuSnu]

Matman. Jeez I came down sick with the flu.
Counterweighted stock strokes seem to make the most durable engines.
I am not nice to mine. I gas on it hard all the time. So mine takes the extra work to keep it up.
It is said that it is hard to get much over the 100hp mark with a single carb. Due to the long intake run. But I do not know this first hand, I have been running duel webbers for a very long time. So i would guess that if you had a 2276 with a single carb, it would make gobs of torque but not make the big hp numbers.

[DeathBySnuSnu]

Matman
Hey a Ural huh. I have been hoping to come across a Dnepr 750 kick start gearbox.
I kick start vw powered chopper......hmmmmm

[matman1972]

Matman
Hey a Ural huh. I have been hoping to come across a Dnepr 750 kick start gearbox.
I kick start vw powered chopper......hmmmmm

The newer ural gearboxes have much more refined gears, and parts are easier to find, but for the most part, they still haven't matched the toughness of the later dnepr gearboxes.
I rebuilt my gearbox from the ground up when I pulled apart my ural. It had sat with water in it for some time, and both shafts were extremely cheap, so I just set it up as new with skf bearings, new shims, etc. I put almost 45000 km on it of very hard riding and never had it go out on me.

That said, I had to deal with several soviet-era suppliers on ebay for the past couple of years, and by far bsa-79 on ebay was the most trustworthy. His name is sergy, out of the Ukraine. It took several weks to get parts, but everything was as described when I got it. I was also happy with old-timer garage.
The absolute best gearbox from USSR would be the Dnepr MT804, or dneprmatic.
I would like to find an mb750 sometime to restore. I liked my ural, but if I am going to go for retro feel and performance, then I want an honest to goodness military antique.

[matman1972]

Matman. Jeez I came down sick with the flu.
Counterweighted stock strokes seem to make the most durable engines.
I am not nice to mine. I gas on it hard all the time. So mine takes the extra work to keep it up.
It is said that it is hard to get much over the 100hp mark with a single carb. Due to the long intake run. But I do not know this first hand, I have been running duel webbers for a very long time. So i would guess that if you had a 2276 with a single carb, it would make gobs of torque but not make the big hp numbers.

That would be my guess too. I have also noticed more hesitation right off idle in colder weather even when warmed up. I imagine that also may be due to the longer runners too.
I may one day go to duals. Can't be harder to synch than my cbx use to be. That could drive you to drink.
I would imagine you are probably right about the single carb. I get plenty of get up and go when accellerating, and don't really feel like it's wrung out until I'm cruising at 75 or so and want to pass someone.

I will probably stay with the 1915 for my trike. I plan to travel a lot, so it may be the best choice for me.

[matman1972]

Matman
Hey a Ural huh. I have been hoping to come across a Dnepr 750 kick start gearbox.
I kick start vw powered chopper......hmmmmm

I'm thinking scrambler...
VW 1200 Dnepr project bike, start up 1 - YouTube

http://youtu.be/vZC0GAnzS1w

Now imagine that with a stroker and dual carbs...

[Rsw]

Here is a couple stoker motors with some boost added. Picked up my new/rebuilt 1600 long block and these are on the motor builders sand dragsters. Think they might be a little to much for a trike.