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Old 12-15-2017, 12:44 PM
  #35251  
SrTelemaster150
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Originally Posted by Hobbsy
Dan, why do they call them 270 degree cranks instead of calling them 90 degree cranks, Thanks. My sons Yamaha has a cross plane crank with the throws all four at 90 degree intervals. Interesting. I guess mfrs. like to use the biggest numbers they can for everything.

Flyer, then there is the 540 cubic inch V-8 1155 which interestingly idled on four cylinders.
Maybe because the firing order is 270 degrees instead of 90? A parallel twin fires every 360 degrees.

Remember the firing orders must equal 720 degrees (2 revolutions) for a 4-stroke twin. Just like the FA-182 has a 180/540 firing order. A single cylinder fires every 720 degrees.

270 degrees would leave 450 degrees before the next power stroke whereas a 90 degree firing order would leave 630 degrees. The 270/450 firing order would be smoother for a road bike, but the 90/630 might be better for a flat tracker for traction in dirt..

Another example would be the Harley Davidson XR750 with the 45/675 firing order for dirt tracks while the street HD "V" twin firing order is 315/405.

Remember that discussion?

Last edited by SrTelemaster150; 12-15-2017 at 12:52 PM.
Old 12-16-2017, 12:24 AM
  #35252  
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Originally Posted by FlyerInOKC
Sounds like a good size working farm. My No. 2 son runs a grain elevator in Kansas, agriculture isn't for the faint of heart.
I agree,lose concentration and farm machinery will start flinging body parts all over the paddock.

Dave i had the pleasure of riding a couple of flat plane cranked yamaha inline fours,they have a slightly off beat almost honda v four sound and feel.I think triumph made the 270 crank twin so it sounded a bit like a ducati v twin,and they feel nicer to ride traction wise.Sr has a good point re traction off turns with v twins and singles,they hook up really hard out of corners compared to the more linear power delivery of a super smooth jap inline four or six.Nice pics the milk truck looks cute.
Old 12-16-2017, 11:12 AM
  #35253  
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When John Taylor came out with the Yankee 500 he chose to use two,Ossa 250 jugs, the first iteration had the pistons rising and falling opposite each other. The engine was turban smooth but also had turban like power and in a turn would rip the rear wheel loose from the dirt. They made another engine with the piston rising and falling together, this engines was more more forgiving and would stay "hooked up" in the turns, but it vibrated.

Thanks Dan, yep I had those figures wrong. Pete, the current Twin Triumph's indeed have 270 degree cranks.
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Old 12-16-2017, 07:57 PM
  #35254  
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s--o I guess no one wants to talk about if a Carb with an Accelerator Pump would work on a Saito 4St, hmmm

Sonny Haven had a Yankee 500 back in the 70s, I thought it had a cool engine, it sure would spin the tires off the line, but in the higher gears the 250 MX and Enduros would walk it,

Jim
Old 12-17-2017, 02:53 AM
  #35255  
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Jim,if you feel the need to chuck a minor hissy fit could you do that on the OS thread...any manufacturer of mufflers that ugly should be shot with a ball of their own poo.Preferably out of a large bore muzzle loader.
Old 12-17-2017, 03:43 AM
  #35256  
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If the correct venturi size it would work, the Webra DynaMix had a pseudo accelerator pump, everyone including Webra sait that the DynaMix required a pump, but muffler pressure would work it. What is the venturi ID? Thanks, Dave

Last edited by Hobbsy; 12-17-2017 at 03:59 AM.
Old 12-17-2017, 04:05 AM
  #35257  
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Here you go Pete, this is the new OS .62v that butchered my fingers, same prop too. That muffler ain't too ugly. I only put 10 minutes on it when the stuff hit the fan, my fingers that is. So I gotta finish breaking it in. I have a couple of Saitos to spruce up first.

The Alpha series still made in Japan have the uglier mufflers.
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Last edited by Hobbsy; 12-17-2017 at 04:14 AM.
Old 12-17-2017, 04:27 AM
  #35258  
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Originally Posted by Old Fart
Jim,if you feel the need to chuck a minor hissy fit could you do that on the OS thread...any manufacturer of mufflers that ugly should be shot with a ball of their own poo.Preferably out of a large bore muzzle loader.
Would .54 be large enough?
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Old 12-17-2017, 07:19 AM
  #35259  
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It was -2F when I took the pictures of the St Regis River @ 9:00 AM from my kitchen deck. Weather underground 200 yd upstream reported -16.6F @ 7:20 AM.

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Old 12-17-2017, 05:48 PM
  #35260  
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OF, well tell you I'm not kicking and screaming "O-Boy O-Boy" about that OS muffler, it looks like some thing Tommy Chong would sell out of his on-line store

Dave, MECOA makes 2 sizes of those Carb's, a .60 size and the 1.20 size, I will Email MECOA and get their ID and OD

Jim
Old 12-17-2017, 07:17 PM
  #35261  
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hey OF, you will like this one, note in the video that he had to lean the engine a click or 2 with the OS muffler to get the same performance the Saito muffler had at it's richer setting,
he said it ran better with the OS muffler due to more tank pressure, OK, that was just tank pressure, I would like to see how it would run on 20%

Jim


Last edited by the Wasp; 12-17-2017 at 09:20 PM.
Old 12-17-2017, 08:59 PM
  #35262  
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Originally Posted by FlyerInOKC
I remember my old 1959 Triumph TR-3A had a engine with a wet sleeve desihn. It was nice because you could just about rebuild the engine indefinitely.
My dad had one of those when I was a kid. I remember the hood was always up and my dads feet usually stuck out from under the car every weekend.

Last edited by blw; 12-17-2017 at 09:12 PM.
Old 12-17-2017, 09:11 PM
  #35263  
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Dave- I missed your comment about getting something out of Salina, Ks. I used to fly into Salina some in 1980-81. We would refuel and fly back to Ft. Riley. I kept my flight helmet that I was issued in flight school and it still has a embroidered daisy stuck on the inside that is from Salina. That's from Flower's Aviation that refueled us. They hired young girls to guide us as we taxied in and they all wore little yellow minidresses that were yellow with flower prints. They gave out the daisies to some of us as souvenirs. Being we were in helicopters we could easily pump the collective a bit and it would blow gusts of air that blew up the minidresses. What a great place to fly into. They had a fireplace inside and you could get free coffee or hot tea.They began giving out yellow bumper stickers that said "Flowers Aviation'. A few crew chiefs got in trouble for putting those on the fins of the UH-1Hs we had.
Old 12-18-2017, 01:37 AM
  #35264  
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Originally Posted by SrTelemaster150
Would .54 be large enough?
Attachment 2247920
Close but no cigar,i had in mind an old fashioned blunderbuss,you can fit more poo in them and i've always liked black powder though i'm no expert.I like delicate falling block rifles and fired one loaded with black powder in 45/70 govt,nice gentle push on the shoulder.No wonder it was single shot could'nt see much for quite a while.You live out in the sticks on a river? nice pic and why is the underground temp important are they mining there ?

Jim dave is right i was thinking about the alpha mufflers made in japan on the OS engines i see here.I can see the difference in the pics you post but ugly is ugly right ?
Old 12-18-2017, 03:49 AM
  #35265  
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Originally Posted by Old Fart
.Sr has a good point re traction off turns with v twins and singles,they hook up really hard out of corners compared to the more linear power delivery of a super smooth jap inline four or six.Nice pics the milk truck looks cute.
The last time I went to the 1 mile dirt flat track race in Indianapolis, chain drive "V" twins were dominating that class. Even the factory Hondas and Yamaha were running that configuration.
Old 12-18-2017, 03:54 AM
  #35266  
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Originally Posted by Old Fart
.No wonder it was single shot could'nt see much for quite a while.You live out in the sticks on a river? nice pic and why is the underground temp important are they mining there ?
I used to shoot 100 rounds of skeet every Sunday during the spring and summer with a 12ga double barrel muzzle loader. The "doubles" @ stations 1.2.6 & 7 were quite a challenge because the oncoming 2nd target would be coming down your throat from behind the cloud of smoke left from the 1st shot.
Old 12-18-2017, 04:43 PM
  #35267  
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Hoping someone here can help. Just found a home for my 56, (in the 30+ year old Seamaster) and think I may have sold the exhaust with another motor in the last swap meet. Really only need the 10 X 1.0 pipe, but the muffler would be a bonus.

Have posted on a couple of forums with no success.
Old 12-18-2017, 05:35 PM
  #35268  
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Rc specialties turbo header if u want to spend that much . I just got 2 and there very nicely made .
RC Specialties TurboHeader Muffler - Products
Old 12-19-2017, 03:47 AM
  #35269  
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Originally Posted by SrTelemaster150
I used to shoot 100 rounds of skeet every Sunday during the spring and summer with a 12ga double barrel muzzle loader. The "doubles" @ stations 1.2.6 & 7 were quite a challenge because the oncoming 2nd target would be coming down your throat from behind the cloud of smoke left from the 1st shot.
You know i won't be able to resist saying you must have a strong wrist to ram down that much black powder in a day.I preferred trap and tower.When are you going to fire up the mighty fa220 zues ?
Old 12-19-2017, 04:43 AM
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Originally Posted by Old Fart
You know i won't be able to resist saying you must have a strong wrist to ram down that much black powder in a day.I preferred trap and tower.
Ramming loads down a shotgun barrel takes much less force than a rifle. With the proper traditional accouterments one can load quite quickly. We would each shoot the singles, then load for the doubles as the others shot their singles. We would usually have 5-6 muzzle loading shooters so the range would allow us exclusive use of one of the 2 skeet ranges. It would take no longer for us to shoot a round than the people shooting "suppository guns".

To me trap is boring compared to skeet. With trap, all birds are going away while skeet has going away, crossing and oncoming targets.

Originally Posted by Old Fart
When are you going to fire up the mighty fa220 zues ?
It won't be until after the holidays and even that will depend on the outside temperatures. I will be sure to do a comparison of the FA-220 on GI to the FA-180HC on CDI.
Old 12-19-2017, 08:24 AM
  #35271  
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Here is a good source of older engine test articles.

Model Engine Tests
Old 12-20-2017, 03:30 AM
  #35272  
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Thanks okc it's bookmarked on the saito section.

Sr that group of five to six muzzleloaders you describe kind of taking over the range sounds to me like getting stuck on a long golf fairway behind the forward group of slow players,or cyclists riding two and three abreast on narrow curvy roads up in the hills on a sunday morning motorcycle ride.Over here the gummint has just introduced a four foot clearance rule when passing a cyclist up to 30mph,faster in the suburbs,and the gap you need to leave increases the faster you go.Saw a funny cartoon of a fourwheel drive vehicle with a big yard broom taped crossways to the 4x and sticking out sideways about as far as the door would if you opened it.And would'nt you love to.
Old 12-20-2017, 05:38 AM
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Originally Posted by Old Fart
Thanks okc it's bookmarked on the saito section.

Sr that group of five to six muzzleloaders you describe kind of taking over the range sounds to me like getting stuck on a long golf fairway behind the forward group of slow players,or cyclists riding two and three abreast on narrow curvy roads up in the hills on a sunday morning motorcycle ride.Over here the gummint has just introduced a four foot clearance rule when passing a cyclist up to 30mph,faster in the suburbs,and the gap you need to leave increases the faster you go.Saw a funny cartoon of a fourwheel drive vehicle with a big yard broom taped crossways to the 4x and sticking out sideways about as far as the door would if you opened it.And would'nt you love to.
It takes no longer for 5 muzzle loaders to shoot a round of skeet than it does for 5 sooters with suppository guns. After shooting the targets at a station, one steps back and reloads while others are shooting. When you turn.comes, both barrels are loaded sans capping the nipples. All you have to do is step up to the station, place caps on the nipples and fire at the clay birds.

BTW, I ride a bicycle and a lot of the people that drive 4 wheelers are arseholes..
Old 12-20-2017, 06:38 AM
  #35274  
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Originally Posted by SrTelemaster150
BTW, I ride a bicycle and a lot of the people that drive 4 wheelers are arseholes..
You are right they all think 4 wheel drive is a substitute for driving skill. A buddy of mine would off road his 72 Chevy half ton pickup. He loved pulling up on a buried to the axle 4 wheeler, whip around him and back up. He would get out while the idiot was still trying to dig it out to look. He would say DANG! You buried it all right. Then get back in his truck and leave. I'm sure he didn't make any friends that way but it was seriously funny!
Old 12-20-2017, 04:57 PM
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When I was in the service I preferred an M-16 on automatic.

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