Here we go again

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worntorn said:
Nice job on the head fins Jim, the head looks good on there
One of the first changes Terry P made when pushing his Vincent type cylinders out from the standard 84 MM to 92 was to add about 30% more fin area to the barrel and head. He is in Oz so very aware of heat problems. He said if we are making more power we need more cooling.
It all seems to work.
He also uses an oil pump with double the standard output for increased engine cooling and more lube, especially to the cams and followers. No doubt you have already done mods there.

I'm hoping the Alloy barrel will help with cooling my 920, although there have been problems with Maney alloy barrels & liners getting hot spots, out of round etc after just a few thousand miles.
From what I have read, the interference fit being used between liner and cylinder might be a bit inadequate for thermal transfer.
I'm going with 5 thou interference.
All a bit of an experiment! Glen
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Be careful with getting too much interference with the sleeves. The barrel will crack between the bores. I cracked two of them trying to keep the liners in contact with the cylinder when hot.

What you need is austentic iron liners -too bad I have never found anyone who makes them anymore.

I have the set of billet cylinders I built with lots of extra thickness. I installed spun cast 355 aluminum liners with Nickasil plating.
I will probably install them one of these days and see if they stay round. Keeping aluminum cylinders round would be a first for me.
 
oldmikew said:
Jim have you experimented with airflow acroos the head? I note that when I fitted a cooler up tight on the down tubes in front of the head, the engine runs cooler even if it is out of circuit.. Can only assume that air passing underneath accelerates before it hits the head and takes more heat away. A counter intuitive consequence for had expected the head to be shielded and run slightly hotter
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Some ducting might help for sure. As much as I hate the thought.
 
Jim
When faced with a daunting ride from Tucson to San Diego on my 250cc Metralla (2 up) and having 120 deg day temps, I chose to cool off in a motel with AC and ride that leg at night. I don't recall but I may have put a little extra oil in the petrol too. Ran a 20 : 1 mix, don't remember but I used either Kendal or Amalie 30 wt.
I did not relish the thought of a seizure in the middle of no-where.
I didn't realize the most scary part of the trip would be going through the mountain roads with no guardrails and a headlight that put out less lumens than a jar full of fire flies. God must have felt sorry for me as I was able to team up with a Kawasaki 500 triple also going to SD riding 2 up also. Those Japanese really knew how to make electrics.
Later I drove back the same route in a truck during the day and realized it may have been a benefit to not see the drop offs : )

Ray
 
Scooter62 said:
Jim
When faced with a daunting ride from Tucson to San Diego on my 250cc Metralla (2 up) and having 120 deg day temps, I chose to cool off in a motel with AC and ride that leg at night. I don't recall but I may have put a little extra oil in the petrol too. Ran a 20 : 1 mix, don't remember but I used either Kendal or Amalie 30 wt.
I did not relish the thought of a seizure in the middle of no-where.
I didn't realize the most scary part of the trip would be going through the mountain roads with no guardrails and a headlight that put out less lumens than a jar full of fire flies. God must have felt sorry for me as I was able to team up with a Kawasaki 500 triple also going to SD riding 2 up also. Those Japanese really knew how to make electrics.
Later I drove back the same route in a truck during the day and realized it may have been a benefit to not see the drop offs : )

Ray
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Now that's funny, teaming up with a Mach III for headlights.
Looking back, I guess it's all relative.....
 
Recently sold my Yamaha SRX400 single, it had what I thought were a ton of rubber dampening pucks all over the head and barrel. They worked though, 'cause it didn't ring nearly as much as my ears do!! (I've got a healthy dose of tinnitus from years of working the Navy flight line). Cj
 
Scooter62 said:
Jim
When faced with a daunting ride from Tucson to San Diego on my 250cc Metralla (2 up) and having 120 deg day temps, I chose to cool off in a motel with AC and ride that leg at night. I don't recall but I may have put a little extra oil in the petrol too. Ran a 20 : 1 mix, don't remember but I used either Kendal or Amalie 30 wt.
I did not relish the thought of a seizure in the middle of no-where.
I didn't realize the most scary part of the trip would be going through the mountain roads with no guardrails and a headlight that put out less lumens than a jar full of fire flies. God must have felt sorry for me as I was able to team up with a Kawasaki 500 triple also going to SD riding 2 up also. Those Japanese really knew how to make electrics.
Later I drove back the same route in a truck during the day and realized it may have been a benefit to not see the drop offs : )

Ray
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Riding at night is good across the desert.

But I won't be adding oil to the fuel.
Oil actually takes the place of some fuel and you end up with a leaner and hotter burning mixture.
Oil also lowers the octane of the fuel.
 
comnoz said:
Since I have been having hot bike problems and I doubt the climate is going to change or the air is going to get denser I decided to add some more fin area to the Fullauto head. It had a little less fin area than an original head anyway. So I welded on an extra 3/4 inch of fin.
View attachment 12192
View attachment 12196
View attachment 12197
I also drilled two 1/4 inch holes under each exhaust port to help keep some heat away from the deck surface. They go all the way through and exit outboard of the port.
View attachment 12193 View attachment 12195
I also drilled a couple more holes in the center
View attachment 12194
Here it is ready to install. Copper wire, a light film of teflon sealant and o-rings but no gasket.
View attachment 12198
looks a bit different in place but not as bad as I though it might.
View attachment 12199 View attachment 12200
Now a few more hours to install the injection and headsteady plus flush the rest of the oil system and It will be ready to run.:cool:
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Nice job on the fins, looks great on the bike!
 
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comnoz said:
And it lives.
But I am going to have to do some damping on those long fins. They ring like a bitch....
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Yes, MZ found much the same on their 250s they supplied rubber blocks to wedge between the fins!
 
But I won't be adding oil to the fuel.
Oil actually takes the place of some fuel and you end up with a leaner and hotter burning mixture.
Oil also lowers the octane of the fuel.

I think the Metralla is a 2 stroke.
 
jaydee75 said:
But I won't be adding oil to the fuel.
Oil actually takes the place of some fuel and you end up with a leaner and hotter burning mixture.
Oil also lowers the octane of the fuel.

I think the Metralla is a 2 stroke.
Click to expand...

It's very much a 2 stroke. More oil in the fuel (pre-mix) definitely helps keep it lubed.
 
Yep a 2 stoke, but the year was 1969. I wasn't nearly as knowledgable as I am now and special 2 stoke oil wasn't very available then. Usually only for outboard motors and my "experiment" using them ended up by replacing a conrod, bearings and crank pin.
One of the cycle magazines of the era published a test of various mix ratios and came up with the 20 : 1 as best. I doubt it was a very scientific test but better than guessing.
Anyway, the trip was from Miami, FL to San Diego and the tough little Bull didn't miss a beat. Did have a flat tire in Tucson but that was thanks to some machining swarf from the wheel that eventually cut the innertube.
Trip took 10 days and I don't think my wife that was on back ever sat on a motorcycle again : ))). Didn't have the desire to ride back so I bought a funny looking little Toyota pick up to return to Miami.
Great adventure but I wouldn't do it today, too old and too many crazies now. I've got a good friend that's my age whose done several Cannonball's and is preping a Reading MC for the 2020 event.
The joy of riding continues even when the old body sez NO!
 
I crashed it last night

So I have warmed up the bike in the shop a couple times now and last evening I retorqued the headbolts and checked the valve clearances. Everything was good.
So this morning I hit the shop at sunrise thinking I would take advantage of the cool morning air for a break-in ride.
Well, it seems some knucklehead had forgot to put the struts down on the bike lift. So overnight it bled down. Unfortunately I had used a milk crate to stand on when I installed the tank. The edge of the lift caught the crate when it went down and the whole works was laying on it's side when I walked in.
It could have been a lot worse. A broken windscreen and a little spilled gasoline were the only damages. And a broken fitting on my oxide blaster which the bike fell against.
The footpeg hit the floor before anything else.
Here we go again
Here we go again
 
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