Return to Thunderdome, the Saga Continues

[Stainless1]

Something you may have noticed, The oil ring runs through the piston pin.  Necessary to get the crown and ring spacing Max wanted. Soooo WWMD (What Would Max Do) he made buttons to support the ring. 

[Seldom Seen Slim]

Sure, I remember Dave Mattson (note a pair of "t"s in his last name).  He and his wife travel to the Salt from Michigan -- that's one way I remember them.  They don't keep a regular pit -- instead working out of the back of their van.  Really nice couple, who've been going to Bonneville for far longer than have I.

I remember last year, when Todd and Debbie arrived on inspection day.  Todd asked me what I'd been seeing (as a bike inspector) and I said, well, this morning started out with your average, run-of-the-mill nitro-burning Vincent...  Todd's jaw durned near hit the ground at that mention (of Dave's bike) -- he wasn't ready for the zillion various feats of engineering that show up at the Salt, even though he's been around the block a good couple of times himself.  Todd, I wouldn't have said anything about you -- but I'm still smarting from your comments earlier today - taken with the fact that I do, indeed, listen to you.

Todd said:  "Then again I know just barely enough to be dangerous to myself and those foolish enough to listen to me."

[gearheadeh]

Sure, I remember Dave Mattson (note a pair of "t"s in his last name).  He and his wife travel to the Salt from Michigan -- that's one way I remember them.  They don't keep a regular pit -- instead working out of the back of their van.  Really nice couple, who've been going to Bonneville for far longer than have I.

I remember last year, when Todd and Debbie arrived on inspection day.  Todd asked me what I'd been seeing (as a bike inspector) and I said, well, this morning started out with your average, run-of-the-mill nitro-burning Vincent...  Todd's jaw durned near hit the ground at that mention (of Dave's bike) -- he wasn't ready for the zillion various feats of engineering that show up at the Salt, even though he's been around the block a good couple of times himself.  Todd, I wouldn't have said anything about you -- but I'm still smarting from your comments earlier today - taken with the fact that I do, indeed, listen to you.


Last I saw that bike it was in impound getting the engine displacement checked. Being Canadian I noticed the 1 liter jugs of Petro can Oil the tech. inspector used to pour into the cylinder. But if you saw the look on my face when he reached for a second one to finish the job on a single cylinder! Quite the huge 2 cyl. bike motor. Also amazing was the then 220plus MPH speeds. I beleive that was 1988.

Todd said:  "Then again I know just barely enough to be dangerous to myself and those foolish enough to listen to me."

[Rex Schimmer]

Stainless it is always great to see what Max is up to, he never fails to impress me with his design and machining ability but most of all his tenacity! Dodge he will not give up!!

Looking at his new blower drive shaft it is interesting that he is using a round "key". When I was designing machine tools we called this "Dutch pinning". A couple of advantages is that the key way in the shaft is that there are no square corners in the bottom so no stress risers and Max is going to fix the end with a ball end mill so the stress risers there are going away also when you do this you normally drill and ream the hole for a press fit of a dowel pin, which I am sure Max has done, and a dowel pin is very strong especially in shear. Some one did mention that there are several manufactures of "couplers" that use tapered rings to connect the shaft to the pulley. The ones that I have used are made by Ringfeder Corp and I have used some of these that are rated at several million ft-lbs of torque. Looking at Max's shaft I would guess the diameter to be 1 to 1.25 inches in dia. and using a pair of Ringfeder assemblies they would be rated at around 900 ft-lbs of torque, probably enough to drive the blower, and I will guarantee you properly applied they will not slip!

Just to mention another blower drive idea is one that Leo Goosen used when he adapted a roots blower to the Offy engine, he use what is called a "quill drive" in that the blower drive shaft was hollow with and internal smaller shaft was used and that shaft that drove the outer shaft, the idea being that the inter shaft would twist and flex and prevent any large shock loads from being applied to the main blower drive shaft. Now this inter shaft has to be made from some pretty good stuff, Leo used aircraft quality 4340 call M300 with a special heat treat and polish finish but it stopped the breakage of the blower drives. 

Keep them coming Stainless!!!

Rex

[Stainless1]

Rex, I think Max is planning to use either a cut off drill bit or end mill as the key...    I think they are kinda hard...

Dave Matson's bike sounds incredible, and will burn your eyes if you stand within 10 feet 

[saltwheels262]

Something you may have noticed, The oil ring runs through the piston pin.  Necessary to get the crown and ring spacing Max wanted. Soooo WWMD (What Would Max Do) he made buttons to support the ring. 

 that is a good idea , hope that it and the drilled holes
for more oil works out.

franey

[Seldom Seen Slim]

Dodge -- I hate it when I have to go back and correct myself -- to admit I made a mistake.  Last time that happened is when I thought I was wrong. . .


...but I've looked in the Bonneville 200 MPH Club book under the coffee table and I see:

M/PS/F 2000     Dave Matson     Vincent           225.643          1988

Sorry for my mis-spelling earlier.  I'll use this for an excuse:  Up here, in the great Finnish-American part of the world, Mattson is a common surname - much more common than Matson.

Sorry, Dave, and all you others.

[Rex Schimmer]

Regarding cooling the pistons with oil this is something that Porsche did with their aircooled flat six when they added a couple of "hair dryers" and it was making 850 hps. They actually drilled an additional oil hole into the engine that pointed at the bottom of the pistons, they sized an orifice to provide the flow they wanted and then increased the size of the oil cooler. Many pressurized inlet engines now use this approach to cool piston crowns and skirts and it is a little more positive than hoping that the crank will through some oil on the pistons.

Rex

[saltwheels262]

  harley twin cam engines have oilers for pistons ,also.

  they are below the cyls., bolted to engine case,
over a pressurized oil passage. a fine mist is sprayed.

franey

[Stainless1]

Concerned citizens rejoice, Max picked up a ball end mill yesterday and finished the shaft, seems I was a little ahead of him.  My mechanical engineering buddy says it looks pretty good, not to mention quite a bit larger than the one that failed....

Todd, here is a couple of the intake from the chamber side.  Max is working these in his spare time...    I'll pop one in in a little bit that has the injector in the hole you see.  Max plans to refine the injector position by checking the spray patterns and clocking as required.

[Stainless1]

Following the same path, here's a couple of pictures of the chamber, then and finally that side of the head

[Stainless1]

Here is the one with the injector installed, there are more that are blurry, hard to see that on the little screen on the back of the camera...    Now if I were a pro I'd probably take better pictures, but then I'd also probably still be working instead of having fun taking pictures of Max working... 

Here's the injector and the pill

Speaking of Max working... here he is working on the crankshaft drive pulley for the blower.  Most of you probably thought he just sits around and smokes while the elves do this stuff.  Nope, he does everything.  If he had that Hurco from Dick's in his garage he could make anything, but he would need a lot larger garage.... 

[TouringComet]

Gearheadeh, re: Dave Matson's displacement.  Even though Dave's older records are in the 2000 cc class, his engine wasn't over 1650 until recently, like this past year.  Back in '88, there wasn't a 1650 cc class.  My pictures of him from prior to 2008 show he was in the 1650 cc class.  Not sure why more than a liter can would be needed to measure a single cylinder back then.  I believe 2008 was the first year his bigger motor made it to the salt.  Although I don't know the actual displacement, he is shown as running in the 2000 cc class on the scta website in the 2008 results.  From prior to the time the 1650 class was added through 2007, he was running a motor smaller than 1650.

[gearheadeh]

    Well 21 years can play tricks on a persons memory right! maybe that 1 plus more liter's was for total displacement on both cylinders. I can't remember for sure now.

[Stainless1]

You remember I told you we would pull the cover off the gear set?

they use straight roller bearings

mounted on the newly located pins.