that's very impressive numbers there. thanks for taking the time to do this.

 

hey tennpenn you and me we just have to quote darkmanx numbers. we thus are hero's and didnt have to spend the dyno money....

 

wow this thread became actually useful lol good stuff dark

 

nobody's going to know you don't have a ported head unless you tell them...

 

I gotta ported head....lol

 

so do i..

 

dark you said your head was ported by a shop? how aggressive was it?

 

compaired to what ? how do you determine how aggressive a heads ported? i just dropped it off and told him my goals and told him i want my power through my whole power band and he did what he did . sorry but i didnt just find a porter and drop my head off i researched the guy i sent him the zzp flow before and after numbers and every other numbers and told him what they where doing , sent him the build book all that crap yada yada , took about 5 months then i dropped it off.

 

ahhh very nice, was just curious to how the job went down thats all :-P

 

Head looked nice. Minimal bowl work, but the ports were nice and even looking, very smoothly blended. Deck finish was very nice as well, chamber edges were super sharp, peeled half the skin off my palm at one point in the job.

Glad to see you making great power X, keep it up. Down to install pistons whenever you are ready.

 

listen to this guy , he inspectected the head more than me , it was just sitting in my closet . I think when im ready for some pistons im gonna do 10.1 compression

 

Pretty sure thats what I had, or 10.5, don't recall, but I only really did it to offset the cams. I dunno if you will gain much from it, but it can't hurt.

 

i just figured with higher compression i would have room to work i would rather knock at 15 degrees of timing and know if i figure out how to stopp the heat ill make more power than be stuck at 25 degrees of timing with no where to go.

 

Very true. I forget about the higher octane effect of the E85.

 

While discussing head porting:

This is the exhaust manifold of a BTCC engine. (= L61 with 2.0l displacement for British Touring Car Championship)
Had 264 (engine) bhp in NA form, but interesting to see how they used the SAI ports for better exhaust flow. Any expert opinions on this?

 

those are using the egr ports for the L61 that exist on the LSJ port? Wonder what they do to the head, for NA i guess it must give something otherwise they would not do it...sor s/c I dunno. I thought of welding them shut, but decided it wasnt worth the effort. i got no expertise in this....

 

Yep.
Do'nt know how the head porting looks (yet), but this manifold at least shows that they used the EGR/SAI ports for flow.
And these BTCC guys got some 285bhp from a 2.0l NA Ecotec engine, so they knew a bit what they were doing...

 

13:1 cr etc...its doable...

 

Very Nice results. Those are the results I think most people were expecting.

 

The final numbers in STD ARE UP. 364/303

 

Except when the rules are 11:1 CR, 11mm valve lift and 8500 rpm max (+ single TB)
(and the last spec is actually 10hp more, very close to 300hp)

 

^damn

 

Hi Alanoo,

You are quite familiar with the Opel/Vauxhall BTCC stuff, so maybe you have a pic somewhere that shows something of the exhaust porting done on those heads??

(Was already wondering why those fancy carbon inlets I saw all worked with a single (60mm Jenvey?) TB...)

 

Nop, saw one late head (2008), but have no pic
Late heads didn't port upto the SAI ports, just had the manifold bolts moved to get some more room for bigger primaries

Single 60mm TB is reg limited too

 

no i think he is thinking about the vtec swap!