Serval porting

[SlowMoe]

Ive been looking at a lot of graphs for stock serval vs ported serval and the gains seem very impressive, especially since typically there is no sacrifice in bottom to midrange power, just gains across the entire powerband, especislly up top.

 

This leads me to believe the port timings arent changed much, if at all.

 

So what is being done to these things? The only thing I can think is that maybe the exhaust is re-shaped/ enlarged some and possiblythe auxilliary exhaust ports are widened and the tunnels hogged out some. Any thoughts?

[trickedcarbine]

I'm an amateur, but I've listened to a lot of folks who were willing to share the info. You have the gist of what's needed listed above, but where it gets technical is when you start to really think about what it takes to create a better combustion. Not just domes, but physically aiming the ports in a way so that as they flow, they go to an intended area with out disturbing one another. Using ports to help push/pull the mixture when it's needed. The real results will obviously vary from cylinder design to another, and knowing how and what to do is gonna come with experience.

[bigweav81]

Well said. Ive came to the conclusion that a/f flow, or flow in general is a lot like a lazy/ dumb co worker. Doesn't know where it needs to go, or how it needs to get there, but with help you can direct the fucker in the right direction.

 

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[Big Mike NY]

My engine builder for my turbo camaro and my Z06 explained it in simple terms which made sense to me. It's about directing the air flow, getting more air in and out of the cylinder while creating the path of least resistance.. Not just about porting the hell out of a cylinder or head.

[SlowMoe]

I'm an amateur, but I've listened to a lot of folks who were willing to share the info. You have the gist of what's needed listed above, but where it gets technical is when you start to really think about what it takes to create a better combustion. Not just domes, but physically aiming the ports in a way so that as they flow, they go to an intended area with out disturbing one another. Using ports to help push/pull the mixture when it's needed. The real results will obviously vary from cylinder design to another, and knowing how and what to do is gonna come with experience.

One would think that the transfer ports on an as cast serval cylinder would be pretty optimal as far as where the charge is aimed. Are you suggesting somewhat of a re-design of the transfer port discharge, or optimizing the sir rent angles by checking and removing any flaws?

[J-Madd]

One would think that the transfer ports on an as cast serval cylinder would be pretty optimal as far as where the charge is aimed. Are you suggesting somewhat of a re-design of the transfer port discharge, or optimizing the sir rent angles by checking and removing any flaws?

I was thinking the same when I read that.

[sleeper06]

Serval tunnels are pretty nice as is, need some cleaning n shaping and evening out but good design. Some people like staggering some don't, some move the triples around some just the ex port. . Every one has there own methods to there madness.

[trickedcarbine]

That^

 

Had a local sled guy go over a 4mil serval last year. He didn't do much with durations. Just crisped up shapes and angles. If you look through the dynos for them here and see the Redline stuff, I believe he claims gains with just minor tweaking of shapes and angles with out drastic duration changes as well.

[SlowMoe]

I'm not sure if I have read any data suggesting just how wide you can go with the auxiliary exhaust ports, but I would imagine there is a significant amount of material that can be taken off and a significant amount of blowdown volume to be obtained..

[SlowMoe]

Are the typical rotary stones ok to use on the tunnel windows or will it chip the nicasil?