Coolant Not Flowing

edgefinder · May 3, 2013

I was looking throught the fins and see a lot of casting flash blocking airflow so got a rattail file to clean them out. It took about a minute to figure out that doesn't work on iron cylinders. So I found a long 3/16" endmill and used the mill. This works really well and I was able to open up the 3rd and 4th grooves down from top that were completely plugged. I'm not finished but you can see the 3rd groove down on exhaust side where it broke through right away on the bottom side but still a lot of slag on top. It was harder to get a picture than doing the work, as usual.

Torontonian · May 3, 2013

Good work ! Now you can contemplate all the headflash.

Hobot · May 3, 2013

oH my yes the lap time dances my barrels have done clearing out air paths. A bust out the big stuff with a punch then get the little stuff with a rat tail file. There is also a blind air pocket to open at head V, its obvious and easy to drill. That was before easy access digital cameras though. If ya drill fins in holes with same ID as fin thickness it does not reduce heat absorbing mass more than increase cooling help.

Rohan · May 3, 2013

Now you've done it !
Upset the carefully calibrated hole sizes for the correct amont of airflow to give the correct temperature gradient down the cylinder.

We wish....

Nice work, and good point.

P.S. The amount of gunge extracted from between the cylinder head fins of an older Norton twin engine had to be seen to be believed.
Oil leaks and dusty roads have a lot to answer for.
And it was still running well....

Dances with Shrapnel · May 3, 2013

One big fat June Bug "splat" and all that work will be for naught.

Hobot · May 3, 2013

Ole John Maygar Dances with his own shrapnel bodges is just going by myth imagination of his novice inexperience, so you have to account for taken his word on road going non racing heaven real life Commando issues which I know full well that a June Bug is so brittle it just breaks up and soon cooks to dust inside the Barrel oven passages.

I have disscussed bugs with many a rider to find its a toss up of whats worse,
the soft juicy kind that splat painly less but dribble their ooze back across head or the hard kind that feel like a Denice the Menace sling shot... its a big reason I always wear protection now... Guess why there is a big white patch on otherwise almost new 3rd helmet...

Note the eye differences it was directly Norton caused... How is your Norton life style?

Bernhard · May 4, 2013

hobot said:
Ole John Maygar Dances with his own shrapnel bodges is just going by myth imagination of his novice inexperience, so you have to account for taken his word on road going non racing heaven real life Commando issues which I know full well that a June Bug is so brittle it just breaks up and soon cooks to dust inside the Barrel oven passages.

I have disscussed bugs with many a rider to find its a toss up of whats worse,
the soft juicy kind that splat painly less but dribble their ooze back across head or the hard kind that feel like a Denice the Menace sling shot... its a big reason I always wear protection now... Guess why there is a big white patch on otherwise almost new 3rd helmet...

Try riding the bike and having a big Y..A..W..N ……when going round a bend when some bug of one description or another goes right into the back of your throat, then the only solution is to swallow the little blighter :!: :x

Dances with Shrapnel · May 4, 2013

Well the hobot is once again so easily misled and missed the mark.

Through hobots exceptional delusions of adequacy, the hobot (or whoever he is) expounds on the virtue of his vast knowledge of all things irrelevant, yet the hobot completely missed the humor in my post....again. It is amazing how the hobot believes in so many things like tunneling into and knowing the thought process of others :lol: A true shaman.

See the twinkle in the eyes? :!:

So hobot, did you hear that they were removing the word "naive" from the dictionary? :lol:

Always up for a little Saturday morning fun on the forum so tell us more about your "learning curve" on bug splatts. After all, who would have thought to wear a face shield or eye protection in Arkansas. Good catch there hobot and thanks for sharing. :roll:

What comes to mind is "learning curve corner cripple" :lol:

As for the OP on clearing the flashing, great idea to open it up a bit - every bit of air flow helps.

edgefinder · May 4, 2013

I knew better than to start posting here.

Torontonian said:
Good work ! Now you can contemplate all the headflash.

hobot said:
oH my yes the lap dances. There is also a blind air pocket to open at head V, its obvious and easy to drill.

I've been contemplating the headflash. Why am I in the shop drilling cylinders instead of getting lap dances?? No i'm not sticking my head in the vise 3 stooges like so she can drill the flash and my blind air pocket out. Or will I get more sex that way? I just wanted to show some work I did.

Rohan said:
Now you've done it !
Upset the carefully calibrated hole sizes for the correct amont of airflow to give the correct temperature gradient down the cylinder.

Finally something technical related to my question but as with most of the posts here its only half the answer. You see I was planning to open up between the lifter tunnels so I can fit a half eaten burrito wrapped in foil there to keep correct temperature gradient. Thanks to the others for pointing out its about bugs. We've got 17 year cicadas comming so I better get this thing rolling.

Hobot · May 4, 2013

AW Dances just playing as look up to you and your seasoned experiences. Big Bugs don't block the air ways for long is all but their dead crust and acids do collect on fork legs so gaiters and shields a good thing for the seals life. We've all likely swallowed some bitter and wiggling insects hoping they weren't posionous or with a stinger still working. Its the eye hits that are most dangerous and I hardly ever ride even to mail box w/o protection.

I like the sprakling look of the daimond fin edge milling which they say adds some cooling efficency but are as sharp as saw blades and a bugger to keep clean.

I've touched up the head passages too deep inside and have played torch flames into the head to see how the gases flow though here and there. One of the Norton brochures made a highlight of the heads ducted air flow paths. Would be nice if someone can find and post it here.

rvich · May 4, 2013

I really have no clue what is going on in this thread and don't have the patience to try to read it all. Good work on the cylinder casting. As for the head, I figure all the flash gives the fins more surface area.

Russ

Dances with Shrapnel · May 4, 2013

edgefinder said:
Finally something technical related to my question ........................

Question? What question?

edgefinder said:
Thanks to the others for pointing out its about bugs. We've got 17 year cicadas comming so I better get this thing rolling.

Yes, Cicades, the mother of all North American bugs. Be afraid, be very afraid.

A well respected entomologist who had worked on the Hurt Report cautioned about the perils of Cicades, especially their adverse impact on cooling of British parallel twins.

In all seriousness I have always wondered about air cooling on parallel twins. There's probably a balance between being able to cost effectively manufacture, durability of fewer thick fins versus more paper thin fins and adequate cooling. How much is enough. I know the KR Harley Davidsons (all cast iron barrel and ports) were wicked hot; maybe it is a limiting factor on power.

Hobot · May 4, 2013

Post started on the joys of clearing out the over cast that blocks-hinders designed in cooling paths. Cost is direct reason production air cooled motorcycle didn't get the thin machined fins and duct work of air craft, but if cost was no factor they could machine up a lighter engine that'd cool even better. Its so fine dusty here I can see a lot of the air flow paths and turbulence 'blasting' clean. Peel may get ear flaps on the down tubes to send even more blast at the corners of the head where exhaust comes out as thermo gram showed that area heating firstest mostest, not the middle as I'd expected.

Gulf Coast states have Love Bugs that fly united in thick clouds to block vision and radiators so a serious problem at some times of the year.

Cicade are a interesting looking insect that smack helmet and jacket but otherwise harmless but for their sounds if that bothers you. Here's what freaks me out working squating sweeting on bike in shed with light on to attract clouds of bug I have to be careful not to inhale, then I get hit by one or more of these which just pisses them off royally and obviously become priority to dodge as usually w/o shirt on and in shorts, ugh.

Must view image tag to see this bad boy, ugh.

acotrel · May 4, 2013

When I was a kid I used to ride my bike without eye protection. I had a pterigium removed and I changed my ways.

Torontonian · May 4, 2013

As a world traveller just returned from Thailand and Burma I can attest to the SIZE of the bugs and their ability to clog up such passages. The bugs are bigger in Asia.

bwolfie · May 5, 2013

I see cleaning up the castings as a good thing. Not something that will show huge dividends, but does instill a bit more pride.
Nothing wrong with that.

I always wear a helmet when riding. I enjoy my scull bieng in one piece, but also we have June Bugs. Flying marbles.
THey will leave quite a welt on any exposed skin they hit. The visor splatter from one is epic..

click · May 5, 2013

bwolfie said:
I see cleaning up the castings as a good thing. Not something that will show huge dividends, but does instill a bit more pride.
Nothing wrong with that.

I always wear a helmet when riding. I enjoy my scull bieng in one piece, but also we have June Bugs. Flying marbles.
THey will leave quite a welt on any exposed skin they hit. The visor splatter from one is epic..

That not a bug it's a pet, put a lead on it & you could bring it for a walk :mrgreen:

7000 · May 5, 2013

So, back to the first picture on the original post, what's that thing three fins down on the right side?

Torontonian · May 5, 2013

Looks like the much-feared coolant-stopping potato bug.

Coolant Not Flowing

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