unequal length runner exh mani

[frank]

cheers guy,s, the conclusion on the volume needed measures about 300cc (29mm bore x 45cm length)
and there seems to be more of a burble under boost conditions, perhaps as a result of the increased pressure in the exh mani when boosting, resulting in a greater volume differential (20+ psi apparently)
so according to that, the volume will need to be increased?doubled for an N/A manifold ! (i might need test out an expansion chamber design)

 

[frank]

the 1st N/A mani had too much volume nice growl, but not much burble
so we have used some s/s flexi (that i can alter the length of) here,s half a meter of it (you can hear it blow off the joint on the final backfire )

 

[pork]

Sounds great!!

 

[JoeK11]

I like id want more growl than burble myself anyway

 

[frank]

been testing the N/A mani on the white car today (50 miles so far) and drove it round our track (sedately till about 50 secs in )
its turning colour now eh

 

[AJC]

Just need to get it dyno'd now see if it makes or loses power over standard and your normal modded mani

 

[frank]

Just need to get it dyno'd now see if it makes or loses power over standard and your normal modded mani

its gonna be about the same AJ (its opened up in the same way) its about 50hp down from yesterday tho
look at all that space now !

 

[h701micra]

Sounds good, nice work Frank

Reminds me of those fake dump valves :/... sounds like the real thing but its not

In no way detracts credit from your work

 

[AJC]

Good to know, i am thinking you are about to be flooded with orders mate down 50hp? how so?

 

[h701micra]

its gonna be about the same AJ (its opened up in the same way) its about 50hp down from yesterday tho
look at all that space now !

View attachment 26243

Could squeeze a turbo in there

 

[frank]

down 50hp? how so?

Could squeeze a turbo in there

thats why ^

 

[AJC]

lol i did realize that after i posted.

 

[frank]

its given me the chance to cut the loop pipe from the TD04 mani, and do a neater s/steel one instead,
the loop took 300ml of water to fill, and i guess the flexi will be nearer to 500ml/500cc (so we,re not there yet in terms of "sound" )
damn cyl # 2 flange has been leaking too eh ! and thats with new factory gaskets fitted, gonna have to copper "O" ring them for boosting i think

 

[jamier2007]

We're they the ones I sent you Frank?

 

[frank]

We're they the ones I sent you Frank?

yes your gaskets mate its just the pre-turbo exhaust gas pressures that blow them (2 or 3 times the boost level i believe)
i,m gonna cut some grooves, and fit copper rings

 

[jamier2007]

Haha Well at least it means your getting some decent boost

 

[scurvy dave]

From looking at this, if I were to get 2 U sections of 1" diameter piping, then this would be easy to replicate? You can weld to the OEM manifold also, which looks pretty awesome.

I like this idea a lot!!!

 

[frank]

yes mandrel bends would be neater dave, it needs to be 1.5mm gauge minimum really tho
we,ve redone the TD04 loop in 35mm o/d s/s, and wrapped the mani too sod this N/A malarkey

 

[frank]

flexi replaced with 35mm s/s tube now heatshield does,nt quite cover it tho

 

[Enuo]

flexi replaced with 35mm s/s tube now heatshield does,nt quite cover it tho

View attachment 26261View attachment 26262View attachment 26263

Add a tiny bit to the heat shield?

 

[scurvy dave]

Love it, when can you take my money....

 

[JoeK11]

Love it, when can you take my money....

thats a good question actually...

 

[Skinner_87]

flexi replaced with 35mm s/s tube now heatshield does,nt quite cover it tho

I've got a heat shield you can have if you want to cut/shut/weld it on to make full stealth shield mate

 

[frank]

I've got a heat shield you can have if you want to cut/shut/weld it on to make full stealth shield mate

thanks paul i will probably wrap a rusty piece of heat shield over the lower pipe (its for a young local member)

 

[scurvy dave]

I think it looks pretty gnarly with the heat shield off.

 

[frank]

1 stage further with the unequal length mani experimentation now the burble one lets the exhaust pulses out in pairs, here is the big-bang version, all 4 pulses exiting together (in theory)

 

[skymera]

1 stage further with the unequal length mani experimentation now the burble one lets the exhaust pulses out in pairs, here is the big-bang version, all 4 pulses exiting together (in theory)

View attachment 29278

It's ...... ALIVE!

Sent from my HTC One using Tapatalk

 

[Noddie]

1 stage further with the unequal length mani experimentation now the burble one lets the exhaust pulses out in pairs, here is the big-bang version, all 4 pulses exiting together (in theory)

View attachment 29278

And there I was thinking you had gone to ground for a while... then you emerge with this!!
Amazing

But this is lacking one thing..... A video!!!

 

[Enuo]

I'm exepecting a video before lunch

 

[frank]

And there I was thinking you had gone to ground for a while... then you emerge with this!!
Amazing

But this is lacking one thing..... A video!!!

i,ll do a vid when its on the car next week ed

 

[frank]

project aborted, sounds cack so we,re back to the single loop one ^

 

[Noddie]

project aborted, sounds cack so we,re back to the single loop one ^

did you put a VW camper engine in there?

 

[Guy]

Great to see you're still being a mad scientist there Frank . I read recently that putting a fancy exhaust on a turbo diesel is pointless because the exhaust turbine in the turbo absorbs so much of the energy in the exhaust you'll never get a loud, cool sounding exhaust note.

 

[McMicra]

@Guy

Do it!

36 Seconds

 

[Guy]

Ha, ha, I had a custom stainless on the 160SR and it sounded proper rude bwoy!