S4:



Ima polish a spare S4 housing.. What did you guys do to ditch the lines that run up to the TB? I managed to hammer out the furrow/nipple from the housing, I thought it was cast in or tapped or something, but it's just like a furrow..



So I have a blank hole.. Tap it and use a plug? What did you guys do?



AND



The S4 elbow. Not going to be running a pressure cap up there. What should I do for maximum prettiness? Is there a stock S4 elbow with no pressure cap up there or should I make a blockoff plate (which coincidentally does not look pretty)..



What are you guys doing for this stuff?

I tapped the holes with a NPT tap, and put in plugs.



Second, I would keep the pressure cap on the elbow, as its the highest part of the cooling system, and its more central than the radiator. Put a 0 pressure cap on the radiator.

Ahh good advice.



Never thought of that.

OK so I tapped the hole 1/8 NPT and plugged it.. Looks neat. https://www.nopistons.com/forums/pub...IR#>/smile.png



And I started polishing it. Hoo boy.



On the topic of getting rid of those coolant lines to the TB (for good), what about the one on the rear iron? And The same for the heater core (since I won't be using one)? How should I ditch those pipe fittings?

I grab the nipples with locking pliers, twist, and pull.



then tap the holes just like you did with the TB, and install plugs.



a picture:

http://pengaru.com/~swivel/cars/rx-7...w_IMG_2077.JPG



and another:

http://pengaru.com/~swivel/cars/rx-7...w_IMG_2074.JPG

For the coolant line on the rear iron, I remove it, and tap that also, but I do that when the engine is apart. In your case, Id just put a cap over it and clamp it on.



For the heater core, I would do the same. Just a cap and a clamp.

In the past I capped the " bungs" that did its job, but wasn't as clean as peng's install. I am going to remove the " bung" and weld it shut this time. I'm not sure on my rear iron through, maybe just remove and tap? I don't want to worry about anything warping from welding..

I would plug it but when I am tapping it the debris from the tapping tool will fall into the motor.. Not cool..



That's why I was curious as to what you guys were doing.. So.. No other solution than to just cap it on a motor that's already assembled?

Hold a vacuum cleaner hose up to it as you drill & tap.

The chips get sucked away before they can fall in.

You said bung....



But, wouldn't it be bad to weld on the housings since they're cast iron?

No.. I wouldn't imagine so..



It's not like your burning alot of wire for that little hole..



If you were welding a plate on it I would be afraid of it warping..

Sorry I meant I was going to remove the nipple on the waterpump housing and weld that shut.

Or you could counterbore it for a small freeze plug.

The motor will be out of the car..



Maybe I should tap it, plug it, then run water through the motor with a hose or something for a while? Think that would catch all the shavings?



(with the water pump housing assembly off...)



What do you think?

Oh yeah and as for polishing..



Should I use a really small grit sandpaper for the finishing touches? Buffing wheel or something? I've never done this before.. I've got it shiny as ****, but not quite a 'glassy' finish.

use high grit sand paper untill there are absolutely no pits in the metal, then polish that bitch up

There was some scuffing from the rougher stuff I was using.. It almost polished out but not quite..



Not enough for my liking anyways. https://www.nopistons.com/forums/pub...IR#>/smile.png



I guess I'll try higher grit then polish!