OST-028: Redline it baby....

[oldeskewltoy]

so... the head is mostly finished... porting wise. My client has ordered a set of Toda valve springs, when they arrive, I'll be re-assembling... and setting the valve clearances for the clients Pon cams.


In the mean time.... the manifold/delete plate "compromise" needs improving... #1 and #4 intake paths are pretty crappy... actually really crappy! If nothing is done... the air speed coming out of the carbs will slow dramatically making low rpm operation less than enjoyable.


Remember... this is the problem.....

oldeskewltoy Wrote:....lets looking at the problem from a different perspective....




The red lines represent the air path from the carb mount flange to the valves. The carb spacing is wider than the ports, and leads to the awkward set up you see.........


So I got to thinking..... what if.....

Above is a bit of an extreme... and is difficult to pull off because the correction passes through 3 different sections of the intake - the manifold, the delete plate, and the head... but the idea is spot on.

A more practical way would be to exclude the head, but to try and correct the intake and delete plate.

First... the manifold surface is not flat... so off to the machine shop to get a minimal machining to get it flat


Then back to my friends mill......




Besides where the bit is currently drilling, can you see any other "new" holes?


Here is a bit better perspective...




And finished.... 5 new holes from the back side of the delete plate... each hole needing to be drilled 3 times (once for tapping, once for thread passage, and finally for recessed Allen bolt head)



I can now permanently attach the delete plate to the manifold - and when I do make it permanent I'll use red FIPG to seal the two.


Prior to making them permanent, I'll need to add some anchor points inside the manifold, and the delete plate for the filler to affix too.



So... here is the idea....



The black dots are small random drillings about 1mm in depth, the "T" is a small flat head screw embedded in the deepest part of the correction



and from another perspective... the red arrow shows where I'll drill for the flat head screw, the red dots are the 1mm deep random drillings for anchoring.



The green "slice" inside shows the significance of the change.



LOTS more to come.........