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I use nothing or copper from rockers to base. never leaks just a little right stuff to seal.


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knuckle head
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Considering this engine will only need to run for a few minutes on each race,oil leakage shouldn't be an issue laughing
Called Smith Brothers to order .060 longer moly steel push rods. Knowledgeable friendly guy I talked to.He asked if I was was running over 400 pounds of open spring pressure..I said about half that.Ball buster .. And the price? Custom made for 8 bucks each.
I should have the engine fully built in a week or so. My partner is cleaning up the OIF frame that should be in my shop this week.


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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I'm curious why you wanted the pushrods 0.060" longer than standard.

With more than standard cam lift,wouldn't you want them shorter so the pushrod is still square to the rocker at 1/2 lift?You've got about 0.050" more cam lift than the standard pushrods were designed for.Wouldn't you want the pushrods 0.025" shorter?

The included angles on the rocker are right on a 650/750.If the adjuster screw is parallel to the valve stem at 1/2 lift,pushrod length is correct.

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knuckle head
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I fully mocked up the engine last week.Using stock pushrods had the valve lash adjusters screwed in all way .Sifton Cams used Triumph blanks and to get more lift on on any regrind,you take material off the cam heel...So now the tappet sits lower.And with the lash caps I have it should be ok.


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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knuckle head
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This is what I have today.....Smith Brothers moly pushrods....and the engine looks like this. The valve geometry looks pretty good. Thanks Pete R for bringing it up.The engine is a 1970 but the crankcase no longer breathes through the primary, but the front cavity instead.Still work to be done on intake length ignition etc....

[Linked Image]

[Linked Image]

Last edited by Hillbilly bike; 03/07/13 11:45 pm.

79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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13" or more of intake length might not be practical.
The short alternative,a little over 10",would still work OK at 5500 and again at 7000 rpm.
Just get the exhaust to work somewhere in between.

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We hope to see it run at Willmington in April. working on my own stuff as weather permits. PRT

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I just noticed that you still have the pre-'71 head,rocker boxes and inner head bolts.
That could make it awkward to fit in the '71 frame.

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knuckle head
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Originally Posted by Pete R
I just noticed that you still have the pre-'71 head,rocker boxes and inner head bolts.
That could make it awkward to fit in the '71 frame.


Pete sees all grin The earlier assembled engine fits in a 71 OIF by cutting off the stock upper motor mount bracket and relocating close to the front of the top frame tube.I did this last year on the cafe racer OIF with an earlier engine.But the cafe machine had plain head bolts on the intake rockers so I may have to "clearance" the frame top tube slightly or cut off the studs...


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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knuckle head
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I did the intake as described by Pete R....This is a mock up,AMAL 932 carbs. The points are just for initial start up then in goes a Pazon

[Linked Image]


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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knuckle head
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My rider partner brought the frame over today after doing a bit of work.It's in bare polished steel,won't be painted.Typical crappy factory welds. 71 frame,71 fork tubes and fork lowers on 78 yokes.74 ish front wheel with axle machined to fit earlier fork lowers.The frame is set up for final ride height.When finished the fork tubes can be slid up in the yokes to alter front height and rake is ride height . 30 degrees rake and sits two inches lower than stock. Rules require the seat to be higher than the rear tire limits lowering. The engine is just a mock up mule I use for our bobber builds. And as always like the bobber builds,this bike is built from old chopper junk and swap meet parts.No decent bikes were injured... grin

[Linked Image]

Earlier I checked the frame to make sure it's true.Taking measurements it was fine except for the right side swing arm axle bracket was off.The axle is where it's supposed to be...the frame rail is slightly tweaked.

[Linked Image]

I can secure the frame and try to massage it with hydraulic power....but for this situation I figured "relieving" the axle hole is best

[Linked Image]


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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Your frame also looks like it may have had the swingarm mount rewelded. Might want to pressure test it before putting oil in it. Probably why it doesn't fit so good? If I had it to do over, I'd brace it as well.
Looking good!

Mike

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knuckle head
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Originally Posted by mblab
Your frame also looks like it may have had the swingarm mount rewelded. Might want to pressure test it before putting oil in it. Probably why it doesn't fit so good? If I had it to do over, I'd brace it as well.
Looking good!

Mike


Yes,my rider ground down a pile of bogger welds,and had to test for leaks several times with some additional welding.

The oil tube swingarm bracket is where it belongs,the misalignment is only at the right side frame rail bracket.


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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knuckle head
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The return oil pipe was plugged with some kind of hard crap resistant to pointy- pokey tools. It's got a bend so a drill won't do it either.Brazed ,so it's easy to remove from a naked frame on a bench.For reference,the drilled hole for the pipe outlet is .135 inch

[Linked Image]


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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I had a similar problem with my original roadrace frame. A guy I know tried to weld up a crack along that swingarm pivot tube where it meets the oil tank to cure a leak there. Didn't put the swingarm bolt and all the spacers in place while he did it and it pulled the pivot out of alignment. Had nothing to do with the right frame rail bracket. Frame is basically junk now unless I can get it in a jig to reposition the pivot and re-weld it.

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knuckle head
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You can make your own fixture to hold it in place.Can be as simple as a few lengths of angle iron temporarily spot welded to hold parts in alignment.
My partner welded it...I thought for sure it was out of alignment from welding distortion but my measurements said it was ok. Now the machine is assembled on the work table and after some fiddling around with home made spacers the engine,front and rear wheels where they should be.So long as it tracks straight I'm good to go.



79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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HELLO; I have been following your LSR build; looks like you are doing everything right.(what are you doing to the cam gears) I have not built a T120/140 motor in a vary long time, 30+ years; in any event, what is your overall opinion of the R&R rods? Im looking at a set I just received today for an A65 build, and Im having second thoughts? I have /did use Carrillo rods, never an issue with Carrillo's other than weight of the rod. I have not heard of anyone else using R&R rods, and have not read any commits on this forum in regard to R&R rods. I also understand that R&R did in fact make rods for MAP; that doesn't tell me anything about the rods. too many beers, second guessing etc.....; in any event, I am interested in your opinion at this point. and if anyone else has any advise/opinion Im interested. yup, opinions are what he/she said..etc...What I need is real life user's of the R&R rod's to give honest evaluation in our application; ie..flogging the sh4T out of the engine
thanks
maxx77

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knuckle head
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The R&R rods were nicely finished, dimensions accurate, and fit in the engine without any issues.The machine shop said R&R rods has an excellent reputation,state of the art aluminum rods from a company that builds competition rods all engines and has extensive air cooled engine experience. Exactly what you might expect from $450 rods....
This is an engine used for short duration racing.. You might want to consider steel rods ,see the "Crower Rod" thread in the Triumph forum here.
You make the call,steel or aluminum.


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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thanks for the response; you are going to have your LSR motor together, and running, long before I get round to putting one of these A65s together. hopefully you'll keep us all advised. I did talk to Mike at R&R before ordering the A65 rods, and he did say that he, personally, had not seen a rod failure in either a T120/140 or a A65, and that, is the reason I bought the rods; and they do dimension out, and are to spec.. was just looking for other builders that had personal experience with these rods. I believe the rods are going to work just fine in the motors Im building, hot street... Good luck with the LSR run; great build man. Thanks again, and stay safe.. your bike is gonna be a rocket. still interested in knowing what, if anything, you have done to the cam/idler gears?? clutch basket??
maxx77

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knuckle head
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The engine isn't too radical really and could be street ridden for short hops.
The whole clutch assembly is NOS 1980 Alloy Tech aluminum
The cam gears are stock Triumph.


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
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I believe if you lighten your cam gears, you just weaken them anyway.--- loose more than you gain.


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Re the R&R rods. I bought a set of R&R rods for my LSR. So far so good, mind I've only run one speedweek with them so far. I'm considering using them in a T140 road bike engine I'll be rebuilding soon as well.
Cheers Mossy


1960 TR6B
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1979 T140E
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1981 T140E
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Use early timing gear as they are way lighter then late ones. late are solid and early are dished out .You wont see any problems in rods till you put them through a good work out over and over. Nothing is forever in a race motor that has been truely raced. I have seen steel rods bent in half too :-)


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knuckle head
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The frame shown in the previous photos was trashed when I discovered a lot of stress cracks....It's not like I have a job so whatever...
A friend had a T140 frame ....I bought it and reassembled all the parts on the new frame.
So this photo shows the right side with some hillbilly engineering on the frame and various mounting brackets. The shift linkage work very nicely. The riders right boot toe is a few inches from the exhaust pipe exit...I'll cut off some pipe and weld on a light turn out.

[Linked Image]


79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons..
“But I don't want to go among mad people,” Alice remarked. “Oh, you can't help that,” said the Cat: “we're all mad here. I'm mad. You're mad.
Joined: Jan 2006
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Looking good, Tony.
Can you make one of those kickers for me?
Mike

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