Tractorsport Flowbench Forum Archive

Posted: **Sat Nov 01, 2008 10:11 pm**

I was able to get some port molds pulled today from my Dart 180 cc Iron Eagle heads. The mold on the top will always be the port that I have ported and the mold on the bottom is the unport intake port. Both ports are pointingg in the same direction. If you really study them you will see what I have done. It has made a very big difference in flow and velocity. I used the polyurethane RTV mold making kit from Tap Plastics. I received a 16 oz can of part A and a 16 oz can of part B, a can of 2300 mold release and a bunch of the mixing-measuring cups. With $10 shipping it came to $62.00 total. I used about a third of the stuff to do these 2 ports. 193.5 cc in one port and 174 cc in the other. The head that was ported and smooth popped right out no problem but the one that was still rough cast took some doing. Here are the pictures.

John

Posted: **Sun Nov 02, 2008 9:16 am**

John, they came out NICE!!!

Posted: **Sun Nov 02, 2008 11:34 am**

Nice indeed!

While we're on the topic of port molds, does anyone have any thoughts as to the best way to make a port mold of a multi-valve head? I'm thinking a two part mold would probably be required in order to be able to extract the mold rubber from the port.

Posted: **Sun Nov 02, 2008 12:35 pm**

John, I don't usually think of urethane as "squishy", but it must be somewhat soft to be able to remove it from the port. Can you post a pic of a mold being squeezed? To be honest, the TAP "Shore A 30" hardness doesn't mean a thing to me! :p Thanks, Doug

Ignore this request as I just watched the video on the TAP website. It looks to be pretty soft! From the price you quoted, it looks like you bought the 1 quart kit?

Posted: **Sun Nov 02, 2008 1:04 pm**

Posted: **Sun Nov 02, 2008 2:26 pm**

Posted: **Mon Nov 03, 2008 1:24 am**

Nice job

Not aware anyone made a kit to do that ...I use red permatex out of the caulking gun tube and its a pita to get out

Posted: **Mon Nov 03, 2008 1:40 am**

Posted: **Sun Jan 11, 2009 8:41 pm**

Just want to add, the USComposites 74-30 is cheaper and A&B are a quart each. 2 molds, and still have a little over half left of each.

Posted: **Mon Jan 12, 2009 3:08 am**

Posted: **Mon Jan 12, 2009 12:32 pm**

Posted: **Mon Jan 12, 2009 7:27 pm**

The instructions say that both parts react with atmospheric moisture and should be used up soon or buy their dry air gas to spray in there to get it out. Just squeeze the bottle so the liquid comes up to the top and cap it with both caps. (comes with 2 per bottle)

Chris.

Tractorsport Flowbench Forum Archive

Port Molds of Cylinder Heads