New ..

[Longboy]

It's a runner! Now you get to the tuning and tweaking and get it to run at its best and add some exhaust pipes. Nice solid design. CONGRATS Minh!

 

[Cogsy]

Congrats on the build. A bit of tuning and I'm sure it'll run beautifully.

 

[minh-thanh]

Hi All !
Update :
With a lot of adjustments, my engine runs ok, now I will make pump and the radiator

To be continued...

 

[minh-thanh]

Hi All !
I'm back
I make a water pump and test it
It's ok , I'll make a new water pump based on it

 

[minh-thanh]

Hi All !
A little update :

I just tried: exhaust pipe
it's aluminum, and it's really hard to weld to me

 

[CFLBob]

I don't know what to call the two big pieces that look like a support with the big triangle cutouts, but those look great! The before and after pictures capture the amount of work you did.

Looking good.

 

[minh-thanh]

Hi
CFLBob

I don't know what to call the two big pieces that look like a support with the big triangle cutouts, but those look great! The before and after pictures capture the amount of work you did.

Looking good.

Yes , it is a support for engine .
Thanks for the compliment.

Hi All !
A little update :
I change the way to make the exhaust pipe :

 

[minh-thanh]

Hi All !
A little update
With many changes and :

Sometimes I wish I could do an engine this way: Cut and Paste !

 

[Cogsy]

It's looking great. Nearly time for start up?

 

[minh-thanh]

Hi Cogsy !

It's looking great. Nearly time for start up?

not yet , maybe about 2, 3 weeks from now,.

Hi All !
A little update :

 

[CFLBob]

Looks good.

How do you get the radiator fins to stay in place? Are they soldered or something?

 

[minh-thanh]

Hi CFLBob !

How do you get the radiator fins to stay in place? Are they soldered or something?

They are just pressed together . I use little w40 oil to pressed them

 

[CFLBob]

They are just pressed together . I use little w40 oil to pressed them

I was thinking that, I just had no way to tell.

 

[Clive]

Hi Cogsy !


not yet , maybe about 2, 3 weeks from now,.

Hi All !
A little update :
View attachment 120713View attachment 120714

How have you kept the fins in place. Doesn't look soldering work ?

 

[minh-thanh]

Hi Clive !

How have you kept the fins in place. Doesn't look soldering work ?

I purposely made the fins and tubes tightly , so when pressed together they would stay in place.
Just fine-tune it with a tool like in the picture

 

[bob shutt]

For the peewee i made spacers and slid them on the two outermost tubes.

 

[dethrow55]

well done, sharp looker.

 

[Clive]

Hi Clive !


I purposely made the fins and tubes tightly , so when pressed together they would stay in place.
Just fine-tune it with a tool like in the picture
View attachment 120736

That's a good tool and removes the soldering issue altogether !

 

[Wizard69]

I'm a little late to this thread but man what a great build!!!!! I hope to see a posting soon with the whole engine sitting on a stand.

As to the issue of tap clearance much earlier in the thread I'v had similar issues at work in the maintenance of equipment. First if you are looking fo along taps they are commonly called pulley taps in the USA. As noted they are expensive but worth it if you have a lot of jobs that need a specific tap size if not you have to improvise. Some ways to improvise:

1. The extension shaft trick is well known but my twist on this is to use Loctite to hold the tap in place. This allows for a reasonable amount of clearance to slide the tap in. Depending upon the Loctite used you can have a working tap in as little as an hour. More importantly no heat related issues, even if you need to apply a bit of heat to replace the tap. Also you don't need to go that big on the shaft size 1/2mm walls can handle the smaller trap just fine.
2. Now some may barf at this idea but a common wrench on the tap can work if you have a way to hold the tap vertical and steady it. Usually this means a finger on the top of the tap to steady and a really short wrench to maintain feel. With care you can tap difficult to get to items especially ones that don't allow for an extension. You may have to make a wrench though to fit the taps square end.
3. plastic tubing (air line tubing) can work if you have it in a size that can allow for the tap to be pressed in. This is likely an act of desperation but if you have no other way to get the tap with a driver it can work with small taps. It works better to clean up existing threads and you still need a hand or fingers on the tap to guide the tap square. Basically you have a flexible shaft.
4. Go down to the local hardware store and buy 1/4" or 3/8" drive extensions for ratchets. Cut off the male square end, drill and face for the tap of interest. The female sock allows you to use common mechanics tools (ratchets, breaker bars, screw driver handles & etc) to run the tap in and out. This can be a quick and dirty way to get an extension without the extra work of fabricating a shaft and a way to drive it. Often these extensions can be found on sale new but more importantly they are dirt cheap used. Thrift stores are the place to look and the cheap ones made of cheese steel are easy to drill. Basically an extension shaft with support for mechanics tools built in.

 

[ShopShoe]

I can add:

If you are not talking about really small taps, you can use an 8-point socket on an extension to turn the tap. I use a T-type handle on the other end of the extension.

--ShopShoe