Inlet Manifold Porting

[MK1_Oz]

I have finally got around to matching the inlet manifold to the head. Currently way out which may partly explain the lack of breath at high revs.

This is a Redline brand that has a water jacket. How much meat is there for me to grind out to the outer edge of the black pen marks? There are a couple of areas that are 5mm out!

[Danny M]

We usually open them up and then weld up the cracks and holes if you break through but they're not that big so you'll be fine

[MK1_Oz]

will grind away. cheers

[Danny M]

You should be opening the whole throat
Take it down to Mike Dale as it's more than just waving a die grinder around at the manifold face

[MK1_Oz]

All done. Took some time to make a nice progression from carby to head faces. Probably have to have another go when my 48's finally turn up (only been waiting 3 years!).

[Danny M]

Did you do the whole length of the port?

[MK1_Oz]

Probably blended down 3/4 the length. I have no doubt that better flow could be achieved but what I have done will be much better than I had. There were a few crack looking bits within a couple of runners - not sure if these were thin areas or just casting flaws. Very small so no issue - probably fill them with a touch of JB Weld.

[PaulMK1]

I used a short steel ruler and ran down the internals - you soon see where the high spots are. The challenge is not opening it too far up on the inside of the bends as you'll end up with a bellows style runner then. I did experiment with a series of cardboard circles 38mm to 45mm to try and ensure I kept the bore true but didn't really help.

[MK1_Oz]

I did exactly the same with a ruler.