X1 ......... cleaning up any lumps and bumps on the intake and any manifold mismatches will assist the intake mixture flow and improve efficiency but in isolation from other more radical tuning any gains will be minuscule. IMO don't mirror polish the ports but leave them with a radial medium to fine grit finish as this improves mixture swirl and tumble before entering the cylinder head.

 

 

Rough or smooth ports have been debated for a long time. Rough seems to be the consensus, and is obviously much easier to do.
What you're really trying to do is make sure the head ports are as big, or just barely bigger than the intake.
So the flow doesn't bottleneck, or cause turbulence from hitting the edge of the head port's wall, sticking past the intake's port's walls.
I have had my engine apart for months, with plenty of time to have port matched it. But, I didn't want the hassle.
Any gains would be small, but I wouldn't be suprised if it smoothed out the engine at certain rpm's.
Those are the things that would be nice to do before and after dyno runs, to see how the power curve changes.

 

Dyno and Land Rover don't belong in the same sentence.



Haha

 

I disagree. I'd actually really like to Dyno a stock engine and my engine to see exactly what I've gained. I'd really be interested to also do a chassis Dyno to see what the drivetrain losses are on these beasts.

Costly though. Not really worth the cost unless I was getting it tuned, which won't happen unless I go to an aftermarket ECU.

 

X1 .............. so true.

I wish I had a dollar for every engine I'd sent to the dyno shop, I'd be mega rich now and ................. none of them were Landrover engines of any type/age

 

 

Returning the Dremel 3000, and ordered a 4000. The 3000 is small, and for $15 more the 4000 seems a good upgrade.

Using these products from Summit Racing. The Eastwood kit is nice, and has mandrels, but this kit has more grits to use. As stated, starting without using a carbide bit.

SUM-G1060
Port and Polishing Kit, 92-Piece, Cartridge Rolls, 60/80/120-Grit, Assorted Sizes, 1/4 in. Shank Mandrels, Kit
(Mfr. #: SUM-G1060)

SAI-716296
Mandrel For Cartridge Rolls, Steel, 6 in. Overall Length, Each
(Mfr. #: 716296)

I am going to use a fine Blue Sharpie to mark the edges of the Gasket, then filling the center with a light blue sharpie.

I will report back with before and after pics when I have the time.

 

Just make sure to stay in the lines!

 

That is the reasoning behind the two colors the fine sharpie is where I will stop.