Ported/Gasflowed EC250 Crankcase - part 2

[savage sausage]

5. I also did some work with the Inlet tract as it was really mishapen and uneven from the factory.
Before

After


6. The finished result
The Boost Port is some sort of a decent shape now


and finally the case as a whole


A bit of effort and time has produced something better than the original, I can guarantee the fuel will now flow better which will make a more efficient engine.

Even if it only makes 0.001% HP improvement then i'm happy with that

maybe my marketing tag line needs to change.
"Savage Sausage Racing Developments - +50Bhp Increase - Satisfaction Guaranteed"

(probably said in an american accent for better sales)

 

[Zman]

That looks great! I did the same thing on a few of my cases when I rebuilt the bottom ends. Smoothing out the castings for flow is good. I was cautioned by Eric Gorr to not take away too much material as it can increase the volume and potentially reduce the lower end compression/flow.

 

[savage sausage]

Thanks zman, it just had to be done.
My cranks back from a rebuild in the UK so now on with the rebuilding show

 

[Capz85]

Looks great, cleaned all those rough edges up nicely


Did porting the cylinder make much difference? Can they be opened up much?

Also have you had your head done?

 

[savage sausage]

Looks great, cleaned all those rough edges up nicely

Did porting the cylinder make much difference? Can they be opened up much?
Also have you had your head done?

I cant honestly tell you the answer if it did or it didn't ,dare I say it did make a difference to the midrange hit.....but without a dyno sheet to prove anything.. talks cheap.

I did it for enjoyment/learning etc with the cylinder and the crankcases, it has to make a significant difference to the way the fuel is burned because the cases and the cylinder ports were all mismatched and shite for want of another word.
but again no dyno no proof - in my head maybe +5hp

No can do on the squish band mod as the 98 has an off centred head and RB designs said he couldn't do it

 

[Zman]

There have to be shops to do the squish, they just need to chuck up the head differently to cut it. Another option is to cut the bottom or top of the cylinder to compensate. Cutting the bottom will move the power band lower similar to thinner base gaskets.

 

[savage sausage]

Shame I couldn't just bang another head on from a later model then all the problems would be solved

Only the guys that have had the squish band set correctly will know the true value of this mod, so unless some kind soul with a lathe can cut it for me then std will have to do

 

[barossi73]

Good to hear you noticed an improvement,after the effort you have put in savage.everyone should own a dremel,theyre brilliant tools!

 

[savage sausage]

Good to hear you noticed an improvement,after the effort you have put in savage.everyone should own a dremel,theyre brilliant tools!

That improvement was just doing the cylinder,so i reckon it will be more noticable with the cases done.

 

[(F5)]

Bugger re offset plug. I've just done a head, well two for my 1970 Suzuki Stinger. I was lucky, sort of, that the chamber is offset to the plug so I got someone to plane the head and then I could cut the chamber using a sparkplug mandrel. But the gg head won't have an offset chamber concentric to the plug.

Planing the head will get the compression too high by the time you've got the squish near right. Yes you totally can machine it but it is considerably more difficult than just hanging it on a mandrel to the plughole.

Here's the before and after for the Stinger for giggles. The GG head on my 07 needed the squish angle redone as well to closer match the piston shape.

I ported my gg200 inlet quite severely. Not my ec200, left that alone but I had a TXT trials as well. The manifold missed the reedblock and hit a flat step on one side and a gaping hole step on the other. I ground on the left and I made a packing block on the right. That I'm convinced helped.

 

[savage sausage]

Bugger re offset plug. I've just done a head, well two for my 1970 Suzuki Stinger. I was lucky, sort of, that the chamber is offset to the plug so I got someone to plane the head and then I could cut the chamber using a sparkplug mandrel. But the gg head won't have an offset chamber concentric to the plug.

Planing the head will get the compression too high by the time you've got the squish near right. Yes you totally can machine it but it is considerably more difficult than just hanging it on a mandrel to the plughole.

Here's the before and after for the Stinger for giggles. The GG head on my 07 needed the squish angle redone as well to closer match the piston shape.

I ported my gg200 inlet quite severely. Not my ec200, left that alone but I had a TXT trials as well. The manifold missed the reedblock and hit a flat step on one side and a gaping hole step on the other. I ground on the left and I made a packing block on the right. That I'm convinced helped.

Thats a big improvement for efficiency for just a small amount of your time,nice work of the heads.

I think I'll just have teeny tiny head skm and polish the chamber,and leave it alone.
I can see you like your 2 smokers, me too bet that RZ500 cheetah is good fun on the roads in NZ