I'm no pro, but shrouding is anything around the valve seat area in the combustion chamber that interferes with flow when the valve is open.

usually seen as a raised lip around the seat...

 

Okay, had to get my hands dirty again tonight cuz the grease was wearing off my hads from the last time

Here's some pics after pulling off the main gears, clutch & cam chains and runners etc...

 

Well, you know i couldn't stop there...so I went ahead and busted it open

Not much blowby at all past the 1st ring, so I'm hopeful the jugs aren't outta round...

 

Take a look at these jugs. Amazingly you can still see some of the original honing cross hatch that wasn't worn down by the original rings

 

Ran outta jerky so put a batch on tonight. My lips are burnin' from the dry rub! I call it everyting-but-the-kitchen-sink

 

Alright. Now I'm hungry AND thristy. And I can't go home yet.

Thanks..

 

Sorry Bro, stop by Boulder Beer's resturant off Wildersnes Pt. on the way home and have a Mojo Risin on me I know the big guy over there and he's our kinda people...
RC

 

good work

 

Tanks bro!

 

MMM i want some jerkey.

I debating splitting the cases on my engine, just not sure about the tranny.

 

Do it the tranny wont fall out...LOL! It'll stay put unless you decide to take it apart...I strongly recommend it cuz you find debris in there you'll want to clear from the original casting...

 

here is some shrouded valves
http://www.034motorsport.com/gallery...qUberHead8.jpg

 

Good example Bill and compared to that the SH has nearly no shrouding to worry about...RC

 

I am just amazed at how well designed the combustion chamber is. Ther is an issue though with not being able to go bigger on the valves, which I am guessing was a problem that they rectified by going to the rc51 which has a bigger bore, and more room in the combustion chamber. The only thing that you could do to help in flow is to go to narrow seats or a smaller valve diamter, something that I wasn't seeing as a big issue in this engine either (where the valve is much to big for the seat it sits on). There are definitely some challenges in making alot more power, but adding some is a definite possibility. Maybe turbo or supercharger, anyone??

 

It's not really all that hard to get the SH engine up to around 150hp, the problem the bike has is that the chassis can't handle the power. When you get to around 130-135 hp the bike starts eating the cases at the swing arm pivot.

For more info on this you can contact Erion racing and talk with them about the SH they set up,

 

My point is there really isn't any cheap/free HP left. You have to do cams, pistons, or something else fairly costly. Its not like some of the engines that I have opened that you can make some big power increases with small changes. I wish there was. Opening the engine up at just the cost of gaskets for power is the best deal you can hope for.

 

You do have a good point and I do agree with you.
All I was trying to do was remind the list members of the lessons learned back in '98 (pre-RC51 days) that showed that, while not cheap, it was possible to get a lot of power out of the motor but if you go to far you'll end up with a whole new set of problems.

 

You would have to provide some serious frame to engine/swingarm pivot bracing to get the bike to last. I wonder if that is something they chased, or if they ran them until they broke. Its amazing what they changed on the rc51 as a result of what they learned.

 

If I remember correctly, that was only for roadrace bikes using sticky rear slicks. These, of course, transmit a lot more force through the chassis.

Let's not forget something else - at those power levels you also run the risk of crank failure. I can't remember where the limit was for sure, I'm thinking it was somewhere in the 140hp range.

 

I'm thinking the crank would be at risk with anything above 130 hp, but I'll find out for sure from the guys that know and let you know ASAP...RC

 

That sounds about right. I remember that it wasn't real high. It makes me wonder what those nitrous and turbo guys are doing. My guess is that they are breaking cranks!

 

Yeah. I remember reading from a few different outfits building VTR racers when they first came out that the max for the stock crank was 130. Maybe guys running nitrous over 130 hp can get away with a squirt now and then but I wouldn't.

 

When I got my Super Hawk and had ridden it a while, I stopped by Bob's house and was talking about what a great motorcycle it was. I had already installed a shock (day 1) and had the forks tuned and a fork brace.

Bob says, "They're really fun when you put an engine in them." That's when it all started. I figured the labor was all love, so it was just a matter of buying parts, and he was a great mentor for me, with the technical aspects of building a high-performance engine.

The great thing about a stage 1 engine is that the engine character is the same, it just has more torque everywhere. To go any further, just costs way too much money (for my pocketbook), and starts affecting the killer street character.

It's a great bang for the buck.

 

Agreed! I ran into a cat at a service station in the hills in FL (small ones...LOL!) yesterday who was riding a nice Duc 1099r and he said he had sold his SH to buy a speed triple and still regrets it to this day
RC

 

The motor in my Moriwaki bike put out 131 SAE HP on the DucShop dyno, on pump gas. The PO told me Moriwaki moved away from major carb mods and ram air because it raised the peak HP up the rev range and it would eat cranks. According to PO, Moriwaki says the weak point is the crank.

 

Before anyone starts to draw a conclusion from this, it's time to remember that the crank is the weak point for most, if not all, motorcycle engines. Let's not start thinking that the VTR's have a "weak crank" or anything! The VTR cranks are perfectly fine, we are talking about seriously increased engine outputs here.

 

Yes, at 130 HP or below they have very strong cranks, that last a good long while. If for some reason you decide to build a $5000, 140HP race motor don't forget a fancy crank.

They put out around 100HP stock, right? You can't just find 130HP with a exhaust, jet kit, cams and head work.

 

what does yours have to get 130hp?? how much torque is it making? thanks

 

Max torque is 73 ft/lbs SAE, it stays above 70 from around 5000RPM till about 9500rpm.

I don't really know what has been done to it. I was told it was built by Dan Kyle for the Moriwaki importer. I would say stage 3 cams, built crank,major headwork, aftermarket rods and pistons, the works. Really I don't care, I just know it's freakin crazy to ride. It also has a RC45 CR trans/gearset. So it shifts like my RC30. I had it at Barber, VIR and CMP. I'll have it at Roebling in a few weeks. If you ever do any STT southern trackdays, stop by and see it, I'm on of the lead instructors.

 

MC Leather pretty much sums in up with,"Really I don't care, I just know it's freakin crazy to ride."

It doesn't matter what you do to the motor to get there the point is get there and you'll be glad you did!
RC