clairetoo
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| posted on 12/4/12 at 10:14 PM |
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Exhaust design
I'm having a bit of a meltdown here - I just cant work out how to do the exhaust on my Mx5 V6 conversion 
I have the manifolds in place , going into slip fit joints with flexi sections (all 2" but what to do next has me stumped - I wanted to do
something similar to my Fury (and happen to have two spare small silencers) but it just aint gonna fit due to the power-plant-frame thingy 
So..........join the two downpipes and go single pipe (but what dia ?) Or twin straight back to behind the diff then the two small box's ?
Any ideas ?
Its cuz I is blond , innit
Claire xx
Will weld for food......
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snapper
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| posted on 13/4/12 at 05:03 AM |
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I believe you can run 2 entirely separate systems, some say a balance pipe joining the two is desirable.
If running 1 system the main pipe would be 3", you can get away with 2 1/2" but unless you have tuned primaries with matched collectors
and specific lengths to the first silencer then really you are only designing the system to fit the chassis.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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matt_gsxr
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| posted on 13/4/12 at 07:52 AM |
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I have no experience, but thought a reply might boost your morale.
(from http://forum.miata.net ls1 conversion)
[Edited on 13/4/12 by matt_gsxr]
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mark chandler
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| posted on 13/4/12 at 10:04 AM |
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Balance pipe is required on V8's, should be soon after the collectors and 2/3rd the pipe diameter, and makes the car sound much better as the
pulses are not even, the V8 burble.
(1-8-4-3-6-4-7-2) left, right, right, left, right, right, left, right.
Not needed on a six cylinder as the pulses are evenly spread down each bank,
(1-6-5-4-3-2) left, right, left right, left right
However a balance pipe anywhere after the collectors will make it sound better, again 2/3rd diameter or the car sounds like 2 x 3 cylinder engines
depending upon where you stand unless directly between the exhausts
Regards Mark
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loggyboy
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| posted on 13/4/12 at 10:24 AM |
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quote:
Originally posted by mark chandler
(1-8-4-3-6-4-7-2) left, right, right, left, right, right, left, right.
5 cylinders on the right and 3 on the left?!
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MikeCapon
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| posted on 13/4/12 at 12:10 PM |
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quote:
Originally posted by loggyboy
quote:
Originally posted by mark chandler
(1-8-4-3-6-4-7-2) left, right, right, left, right, right, left, right.
5 cylinders on the right and 3 on the left?!
It's still a V8. Just a bit of a special one.
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mark chandler
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| posted on 13/4/12 at 06:46 PM |
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hmmm, re-think
18436572
lrrlrllr
Gor it.
Left, Right, Right, Left, Right. Left, Left, Right
The point being that on a normal V8 the pulses are uneven hence balance pipe required
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clairetoo
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| posted on 13/4/12 at 07:03 PM |
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Seeing that V8 miata exhaust made the decision for me - two near straight pipes with the silencers at the back , probably side-ways across the car
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Just gotta get some more pipe and bends........and find two suitable silencers at a sensible price , going this way means I can fit two box's
22" long and 7" diameter .
I started on the first pipe tonight , and nothing will be lower than the chassis rails , so looking good so far
Its cuz I is blond , innit
Claire xx
Will weld for food......
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DIY Si
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| posted on 13/4/12 at 07:35 PM |
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I intend running two pipes to the back of my Sprite,as it'll be easier to sort out, although will obviously use much more tube. Link pipe
somewhere at the front and then one to either rear corner.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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clairetoo
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| posted on 13/4/12 at 07:44 PM |
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I forgot to add that it will have a balance pipe , as far forward as is practical (on the Mx6 it is just a few inches after the manifolds)
I originally ran my Fury without a link , and the sound was awful to me - half a V6 in one ear is not the best engine note . With the link , it not
only sounded better , but seemed to have a lot more torque as well .
Its cuz I is blond , innit
Claire xx
Will weld for food......
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