FC to FD to ported FC port comparison pics

[StavFC]

Took my ported FC 13B apart yesterday, plus a spare stock FC 13B I had, and along with a stock FD 13B we took some comparison pics if anyone wants to see.
 
My engine is a \'side ported\' FC engine by ERC (Elite Racing Corporation) www.erc-rotary.com
 
The ports are amazingly well done, like glass to the touch.
Ive heard a few times that FD ports are much bigger than FCs, but, well, they are, but not as much as people say. The \'Large ported FCs are only as big as stock port FDs\' rumour ive heard a few times is ...., thats for sure...
 
In the centre iron, the FD inlet ports are MUCH taller than even my ported FC ones, and about as wide as the stock FC ones, but neither are as wide as my ported FC ones...

 
Very similar situation on the side ports...

 
The reason being is the FC lower inlet manifold isnt tall enough to have any bigger TBH. But whats probably more important is how big the ports are as the reach the rotor...
 
On the centre iron, the stock FD is a fair bit bigger than the stock FC, but my ported FC one is miles bigger than both of them...

 
On the side irons the FC and FD ones are actually very similar, but again my ported FC ones are bigger than both as expected...

 
On to the exhaust side, FC and FD ports are totally identical. But the difference between my ported ones and stock ones are pretty big...
 
From the outside...

 
From the inside...

 
With a ruler to see the difference easier...

 
And finally all 3 to show FC and FD ones are the same...

 
Hope this is helpful/interesting to people.

[dthebuk]

Thats pretty useful.

The porting looks amazing as well. So whats the plan for the FC?

[StavFC]

Probably shouldve posted this in tuning really, but didnt think.
 
Plans, make it work again, and make it even faster.

[Prof]

Ports look quite meaty without being over the top.  They look far enough away from the edge to keep the corner seals from dropping out.
 
Be interested to know if the gasket between the lower inlet manifold and the engine was matched to the porting work - mine wasn\'t first time round - I\'m sure the added gasket material makes for some turbulence and restriction.  I filed away at my gasket to match the block porting, then used it as a template to hone out and flare the bottom of the lim to match them both.
 
More often than not the irons get sent off to someone for porting, and it isn\'t necessarily them putting the engine back together again.  I do wonder if this step gets missed some times - negating some of the work of the porting.

[BlitzBoy]

yip looks like a good port job, much better then a lot I have seen.
Of course the porting done by the Oldone is the Mona Lisa of porting

You defo can run a bigger turbo on those Ports you have shown , GT35R\\T04S size

[StavFC]

Prof- Yes, the gasket and inlet manifold have been port matched too, thankfully.
Blitz- A 35 wouldnt be big enough improvment for me to bother really unless I could wring its neck at 2bar, and I cant, so i\'ll go bigger.