Fins on back of Valve & Fins pre TB

[vlad01]

Wall thicknesses of the ports, might you these are already ported.

[TdracerTd]

Maybe I missed a thread somewhere. What printer are you using. I'm think of getting one myself. I like the look of the rockstock kit.

[Gareth]

Thanks vlad but they are L67 heads...

you got a design your planning on trying?

Yeah, back on page 13 is the start of a dual runner manifold like the ferrari one vlad posted, i think that this will be the most effective way to make a broader torque band.

[Dazza92VP]

L67 are exactly the same just the injector bosses haven't been drilled on the ecotec ones so all the wall thicknesses and shape will be the same except for the fact that these are ported heads so should be even more meat around then
Looks like some one went a little to deep on the inlet port though

[The1]

Thanks vlad but they are L67 heads...

you got a design your planning on trying?

Yeah, back on page 13 is the start of a dual runner manifold like the ferrari one vlad posted, i think that this will be the most effective way to make a broader torque band.

missed that, will be interesting. If you go dual plenum that'l have an effect on TIP in to, nothing that can't be taken car of with a tune, top end would like the more volume, then if the runners are a bit long to for more bottom end.

[The1]

Maybe I missed a thread somewhere. What printer are you using. I'm think of getting one myself. I like the look of the rockstock kit.

That kit doesn't look to bad, has some nice print height to it, the nozzle is 0.5mm not the best now all the new ones are using 0.4mm.

The biggest flaw i see in all these printers is that they are not enclosed, the air temp plays a huge roll in quality of the print. We actually have a few 3D printers at work but ive found the cheapest one the best as it is fully enclosed, though in saying that to make it the best i had to fiddle and calibrate the thing for days to get it running top notch. It's the XYZ Davinci 1.0A, they had a big price drop and most places have them for $700 now, it's print dimensions are 200Lx200Wx200H in mm, it has a 0.4mm nozzle, has a heated bed, can do PLA and ABS, though id rather use ABS, much stronger and can handle more heat. PLA is easier to print with and has less issues with calibration, so if you hear people saying they switched to PLA cause it prints better it usually means they CBF calibrating there printer properly.

The XYZ out of the box is a very good quality printer but locked down so hard you can't do anything with it, it runs a cartridge system so your locked into buying there spool box's, the software allows 0% control over the machine, you can only drop a file in and hit print, in saying that it does work, but no good when you want to do more than print a phone case out. So you use this firmware here with the open source Repetier software host, gives 100% control, you can use whatever slicer you want and setup all the profiles how you want, you can use a spool on the machine as the custom firmware doesn't care about spool cartridges. The firmware mod isn't hard, you can brick the printer but it's not a hard brick, you can clear the firmware by shorting out some pins on startup then just reflash again. I would so love to have one of these at home, the possibilities are endless. Anyway i wont go on to much about it, could be for another thread if there's interest.

http://www.repetier.com/
https://github.com/luc-github/Repetier-Firmware-0.92

[vlad01]

Thanks vlad but they are L67 heads...

you got a design your planning on trying?

Yeah, back on page 13 is the start of a dual runner manifold like the ferrari one vlad posted, i think that this will be the most effective way to make a broader torque band.

same heads just injector boss. The page actually shows mostly L36 heads, just the odd L67.

In the states the late L36 and L67 are the same casting just not drilled on the L36.

[vlad01]

L67 are exactly the same just the injector bosses haven't been drilled on the ecotec ones so all the wall thicknesses and shape will be the same except for the fact that these are ported heads so should be even more meat around then
Looks like some one went a little to deep on the inlet port though

Thats the exhaust port (top pic), at the edge of the guide boss. Yeah probably ported too deep there, but that is more or less the shape there.

[Dazza92VP]

I was looking at the bottom pic he angle the photo was taken at it looked like the valve guide hole is a hole in the inlet wall sort of just didn't look at it right

[vlad01]

going back tot he bellmouth. Seems to be a bit of question what its for.

my local mechanic mentioned it was to straighten air out due to it favoring one side because of the 90º elbow and that the formula holden engines had overcome this but making an elbow that was vertical.

Was an interesting idea so i went out to test this.

I setup a manifold and intake pipe and supplied an air jet at the beginning of the pipe to form a venturi effect to get some large volume of air moving though.

With bellbouth I found what to be 80% of the air rushing out of both front ports, nearly the remaining from the middle ports and almost undetectable amount from the rear ports.


So out went the bell mouth and results were much different. The 3 driver side ports had heaps of air coming out in equal amounts, pasanger side a little less but virtually the same for the front port, bit less for the middle and not much on the rear but still more than with bellmouth.

I just felt the air bringing my face close to it and feeling it on my skin so i do my best to describe how it felt. Really it would need some sort of flow meter on each port to get actual numbers.

with bellmouth

L< > R ^F

80%----80%
18%----18%
2%------2%
___| |
_____|

without

18%----20%
14%----20%
8%-----20%
___| |
_____|

Mind you the suction of the engine will over come most of the feed air flow restriction but its extremely interesting to see the difference. When looking into the 2 back ports and half of one middle one you can see its actually blocks most of the port opening in the plenum.

Also I will point out that the 20% figure on the lower diagram flowed like the 80% one up top. So overall the free flowing air increased considerably.