Air cooled scoot kit with giant head on hobbit?

So I'm going to try to make an air cooled scooter kit work with a giant eurokit style head. 48mm ruima kit.

It's really quick, used it on another bike.

I know people have run wc scooter kits a lot, but how many folks have run air cooled kits with big heat dispersing heads? I saw the derbi AC cyl but he was running a crazy fucking giant kit.

I know my wc heads do a great job wicking heat away from a cyl, just curious if this kit would need fins brazed on or if air cooling would

be enough without its intended fan.

Wouldn't hurt I'm sure, just curious if fins would be needed for reliable running. Maybe I'll add a scoop in each corner to direct the air across its perpendicular fins idk yet

Don't want your stupid uniformed opinion, only people who have run this please or read about others doing it thx

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Re: Air cooled scoot kit with giant head on hobbit?

My stupid uninformed opinion is the fins on the cylinder are too small to provide much cooling even with scoops. scoops are cool tho. run the scoops.

Re: Air cooled scoot kit with giant head on hobbit?

Just had to post huh?

You have zero experience in this so shut it

Re: Air cooled scoot kit with giant head on hobbit?

Looks interesting .

I can tell you , from personal experience that even a few fins LESS on the head is detrimental . Keeps way too much heat in the head .

So , I would have to think that way more fins are going to be a lot better .

I never had a gauge to say exactly what the difference was , just plug chops . They were telling enough to avoid meltdown .

That's all I have .

Re: Air cooled scoot kit with giant head on hobbit?

Not helpful

You people cannot follow direction.

Re: Air cooled scoot kit with giant head on hobbit?

> JBOT Admin Wrote:

> -------------------------------------------------------

> Not helpful

>

> You people cannot follow direction.

Hey . You get a core with every apple . ;)

Re: Air cooled scoot kit with giant head on hobbit?

🇮🇹💦 Of the Loin /

The metra/eurokit heads have great heat dissapation already (observed one drop temps on a V1 polini with no fan by 50 degrees)

That's literally a less tuned version of what you're running (cylinder fins are perpendicular to air flow)

The secret is in the large radius of fins with all that air flow in between them on the head, it also allows some air to directly hit the largest cylinder fin

You'll probably be fine

Re: Air cooled scoot kit with giant head on hobbit?

Mainland with the first empirical info.

Thx, yeah my wc heads pull so much heat out of the jug that you don't even need cyl fins. Eurokit head might be just enough

Re: Air cooled scoot kit with giant head on hobbit?

Ľ̷̝̽͒i̶̛̼͑͠ȁ̸̧̛̽m̵̻̟̯̀̅ ̷͎̙̽̊F̶̲̺͑̓ F /

I think you would have issues with cooling the cylinder, since it looks like the part of the head with no fins is nearly completely covering the cylinder cooling fins, so a shroud may be needed if you are running it horizontally

Re: Air cooled scoot kit with giant head on hobbit?

Tweaker trash /

> JBOT Admin Wrote:

> -------------------------------------------------------

> Not helpful

>

> You people cannot follow direction.

Your just an old grumpy fart Lol

What kit? Riva and razz are cylinder inducted

Re: Air cooled scoot kit with giant head on hobbit?

Dirty30 Dillon /

> Barack Obama Wrote:

> -------------------------------------------------------

> > JBOT Admin Wrote:

>

> > -------------------------------------------------------

>

> > Not helpful

>

> >

>

> > You people cannot follow direction.

>

> Your just an old grumpy fart Lol

>

> What kit? Riva and razz are cylinder inducted

Probably a Dio cylinder. Ruima's good iron.

Re: Air cooled scoot kit with giant head on hobbit?

Tweaker trash /

Get off my lawn

47958425-649D-4DB9-BAF9-0BC2ACD00E0D.jpeg

Re: Air cooled scoot kit with giant head on hobbit?

Carless is a fuckface go away you mucus covered piece of shit

Re: Air cooled scoot kit with giant head on hobbit?

Tweaker trash /

> JBOT Admin Wrote:

> -------------------------------------------------------

> Carless is a fuckface go away you mucus covered piece of shit

That’s jbot’s way of saying he loves you

Re: Air cooled scoot kit with giant head on hobbit?

Dang dude looks like the head would wick away a decent amount of heat. I wonder if you notched some airflow lines in the kit it would help...Idk may hurt it.

How much cooling does the fins on the kit actually do? 🤷🏼‍♂️ Would the airflow from the head take care of a lot of it?

Please tell me your going to try! At least for the sake of the common people!

....and yes not helpful (edited)

Re: Air cooled scoot kit with giant head on hobbit?

Oh I'm doing it.

Only question is whether or not I'll have to add fins to the rumia..

Re: Air cooled scoot kit with giant head on hobbit?

Some maths I've run over the years:

Free air cylinder looses 80% of it's heat through the head

Fan cylinder is 10x more effective at cooling per unit of fin surface area.

Those are super rough numbers but based on a few different projects I've worked on with like, real good sciencey shit.

Re: Air cooled scoot kit with giant head on hobbit?

I've seen some Dutch moped racers do this so it should be fine.

Re: Air cooled scoot kit with giant head on hobbit?

THANKS!

> Bas Autowas Wrote:

> -------------------------------------------------------

> I've seen some Dutch moped racers do this so it should be fine.

Re: Air cooled scoot kit with giant head on hobbit?

Tweaker trash /

Add some aluminum cooling fins for electronics....jbot are you an admin?

I feel like this stuff is kinda easy For a admin or whatever. I could do this, I have done something similar. I was expecting something greater what I got was myself.

Set the bar just heigh enough so you can touch it then bring it down a few inch....I need a new hobby because I’m bored.......really bored, Challenge me

Re: Air cooled scoot kit with giant head on hobbit?

Russell Huddy /

I ran a air cooled 47mm malossi scooter kit on a Derbi years ago with a re cut stock head. Heat wasn’t that big of an issue and I’m not very good at tuning.

You’ll be fine

Re: Air cooled scoot kit with giant head on hobbit?

Ok here you go.

My challenge to you.

Quit mopeds and go fuck yourself.

> Barack Obama Wrote:

> -------------------------------------------------------

> I need a new hobby because I’m bored.......really bored,

> Challenge me

Re: Air cooled scoot kit with giant head on hobbit?

thanks.

I'll be getting to it soon.

> Russell Huddy Wrote:

> -------------------------------------------------------

> I ran a air cooled 47mm malossi scooter kit on a Derbi years ago with a

> re cut stock head. Heat wasn’t that big of an issue and I’m not very

> good at tuning.

>

> You’ll be fine

Re: Air cooled scoot kit with giant head on hobbit?

Tweaker trash /

> JBOT Admin Wrote:

> -------------------------------------------------------

> Ok here you go.

>

> My challenge to you.

>

> Quit mopeds and go fuck yourself.

>

> > Barack Obama Wrote:

>

> > -------------------------------------------------------

>

> > I need a new hobby because I’m bored.......really bored,

>

> > Challenge me

When we ride mopeds we are fucking ourself

Re: Air cooled scoot kit with giant head on hobbit?

Wait wait, dumb question from my guesstimating mind, doesn't the oil/intake cool the cylinder and the head acts as the heat sink for the leftover combustion?

Makes sense to me if the big boi heads pull heat off the fan delete engines as much as maitland says.

If this dumb idea works like I think then even though the fins are super far away they will create a bigger heat sink to draw the heat further out? IDK I've been drinking claws all day fuck me if I'm wrong.

Re: Air cooled scoot kit with giant head on hobbit?

You're forgiven for being wrong,

Not forgiven for drinking fucking white claws you pig

> Mitch Mills Wrote:

> -------------------------------------------------------

> Wait wait, dumb question from my guesstimating mind, doesn't the

> oil/intake cool the cylinder and the head acts as the heat sink for the

> leftover combustion?

>

> Makes sense to me if the big boi heads pull heat off the fan delete

> engines as much as maitland says.

>

> If this dumb idea works like I think then even though the fins are super

> far away they will create a bigger heat sink to draw the heat further

> out? IDK I've been drinking claws all day fuck me if I'm wrong.

Re: Air cooled scoot kit with giant head on hobbit?

In all serious tho,

I've experienced wc heads pulling insane amounts of heat out of cylinders where the cylinders fins were not very effective. Basically the extreme heat sink action just pulls the heat out like crazy.

Since this is one of the biggest air cooled heads for 70cc, I'm hoping I can do the same with this air cooled to an extent. Moby av7 cylinders have tiny fins and the extreme cooling makes it run nice.

But if head temps get too high I'll just throw a watercooled head on this kit on another bike.

Went thru my pipes today to figure out whether I'm going to make a new header for the pipe that's on the green hobbit, or cobble together a new pipe.

Don't know. Gonna try to get this knocked out in this week.

Re: Air cooled scoot kit with giant head on hobbit?

Maybe I'll weld more fins to the head, like make it super cool without looking like a computer heatsink, gross

Re: Air cooled scoot kit with giant head on hobbit?

Tweaker trash /

Jbot you literally just get mad and call people names......dude we all love you. Just chill out no need to get angry and frustrated.

The computer stuff would match your crate and barrel company theme

Re: Air cooled scoot kit with giant head on hobbit?

🇮🇹💦 Of the Loin /

metal will attempt to match temperature with other mated metals

the rate at which this happens depends on the materials involved

cast iron is good at being a heat sink, since the heat delta is slower as it takes more energy to heat up cast iron than say, aluminium

this means its harder to heat up but also harder to cool down.

A big ole aluminum head can quickly change temperatures so the faster you can cool it the faster it will leech heat from the cast iron heat resevoir, and the cast iron will keep the temperature change smoother due to its slow delta

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