Inlet manifold spacers, worthwhile?
#2
Scooby Regular
iTrader: (1)
Yeh defo worth it , give as performance a call they will be able to supply the correct ones and gaskets.
Does help with silicone inlets as you have more room.
http://asperformance.com
Does help with silicone inlets as you have more room.
http://asperformance.com
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#10
Scooby Regular
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Does anyone have any links to some scientific bath to back the effectiveness of thermal inlet spacers up?
I don't mean "my inlet feels colder", I mean actual pre/post inlet data logs?
I don't think they're effective because the volume of the inlet is relatively small (couple of litres), so the air does not sit around for long enough to be heated up, as far as I can tell.
eg let's assume the inlet is 10 litres (vastly over estimated), and the engine is at say 3000 RPM, and youre on full throttle.
let's assume a fill rate (aka VE?) of around 80%, it means that every two revs you'll suck through 80% of 2.0 litres (1.6 litres), I.e roughly 9 cycles to empty the manifold and replenish it with outside air.
9 cycles takes 0.36 seconds at 3000 RPM.
Can't see how enough heat would be able to transfer into the air from even a glowing manifold.
there are other benefits, though, eg more space for inlet pipe
I don't mean "my inlet feels colder", I mean actual pre/post inlet data logs?
I don't think they're effective because the volume of the inlet is relatively small (couple of litres), so the air does not sit around for long enough to be heated up, as far as I can tell.
eg let's assume the inlet is 10 litres (vastly over estimated), and the engine is at say 3000 RPM, and youre on full throttle.
let's assume a fill rate (aka VE?) of around 80%, it means that every two revs you'll suck through 80% of 2.0 litres (1.6 litres), I.e roughly 9 cycles to empty the manifold and replenish it with outside air.
9 cycles takes 0.36 seconds at 3000 RPM.
Can't see how enough heat would be able to transfer into the air from even a glowing manifold.
there are other benefits, though, eg more space for inlet pipe
#11
Scooby Regular
iTrader: (2)
Does anyone have any links to some scientific bath to back the effectiveness of thermal inlet spacers up?
I don't mean "my inlet feels colder", I mean actual pre/post inlet data logs?
I don't think they're effective because the volume of the inlet is relatively small (couple of litres), so the air does not sit around for long enough to be heated up, as far as I can tell.
eg let's assume the inlet is 10 litres (vastly over estimated), and the engine is at say 3000 RPM, and youre on full throttle.
let's assume a fill rate (aka VE?) of around 80%, it means that every two revs you'll suck through 80% of 2.0 litres (1.6 litres), I.e roughly 9 cycles to empty the manifold and replenish it with outside air.
9 cycles takes 0.36 seconds at 3000 RPM.
Can't see how enough heat would be able to transfer into the air from even a glowing manifold.
there are other benefits, though, eg more space for inlet pipe
I don't mean "my inlet feels colder", I mean actual pre/post inlet data logs?
I don't think they're effective because the volume of the inlet is relatively small (couple of litres), so the air does not sit around for long enough to be heated up, as far as I can tell.
eg let's assume the inlet is 10 litres (vastly over estimated), and the engine is at say 3000 RPM, and youre on full throttle.
let's assume a fill rate (aka VE?) of around 80%, it means that every two revs you'll suck through 80% of 2.0 litres (1.6 litres), I.e roughly 9 cycles to empty the manifold and replenish it with outside air.
9 cycles takes 0.36 seconds at 3000 RPM.
Can't see how enough heat would be able to transfer into the air from even a glowing manifold.
there are other benefits, though, eg more space for inlet pipe
#12
Scooby Regular
iTrader: (5)
Sure, but my point is that the benefits can easily be outweighed by other "noise".
for example, if you bought manifold spacers, id guess they'd set you back minimum 50 quid, let alone labour etc to fit unless you're doing them yourself.
That 50+ quid could potentially be better spent on something else performance related.
Basically, what I'm saying is that I'm personally not convinced they're not an almost complete waste of money, unless you are fitting them to raise the manifold to be able to fit a bigger inlet pipe.
for example, if you bought manifold spacers, id guess they'd set you back minimum 50 quid, let alone labour etc to fit unless you're doing them yourself.
That 50+ quid could potentially be better spent on something else performance related.
Basically, what I'm saying is that I'm personally not convinced they're not an almost complete waste of money, unless you are fitting them to raise the manifold to be able to fit a bigger inlet pipe.
#20
Scooby Regular
iTrader: (3)
I've had a quick Google and grimmspeed have tested their own:
http://www.grimmspeed.com/phenolic-t...i-lgt-fxt-8mm/
And this website has a good write up:
http://www.autospeed.com/cms/article.html?&A=110474
http://www.grimmspeed.com/phenolic-t...i-lgt-fxt-8mm/
And this website has a good write up:
http://www.autospeed.com/cms/article.html?&A=110474
#21
Scooby Senior
iTrader: (68)
I've had a quick Google and grimmspeed have tested their own:
http://www.grimmspeed.com/phenolic-t...i-lgt-fxt-8mm/
And this website has a good write up:
http://www.autospeed.com/cms/article.html?&A=110474
http://www.grimmspeed.com/phenolic-t...i-lgt-fxt-8mm/
And this website has a good write up:
http://www.autospeed.com/cms/article.html?&A=110474
http://www.grimmspeed.com/phenolic-t...ter-n-a-98-06/
#22
Scooby Regular
iTrader: (3)
But in the interests of balanced reporting these audi websites report no difference at all:
http://www.audizine.com/forum/showth...henolic-Spacer
http://www.myaudis4.com/phenolic-spacers/
Yes, I am having a boring day at work.
http://www.audizine.com/forum/showth...henolic-Spacer
http://www.myaudis4.com/phenolic-spacers/
Yes, I am having a boring day at work.
#23
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Does anyone have any links to some scientific bath to back the effectiveness of thermal inlet spacers up?
I don't mean "my inlet feels colder", I mean actual pre/post inlet data logs?
I don't think they're effective because the volume of the inlet is relatively small (couple of litres), so the air does not sit around for long enough to be heated up, as far as I can tell.
eg let's assume the inlet is 10 litres (vastly over estimated), and the engine is at say 3000 RPM, and youre on full throttle.
let's assume a fill rate (aka VE?) of around 80%, it means that every two revs you'll suck through 80% of 2.0 litres (1.6 litres), I.e roughly 9 cycles to empty the manifold and replenish it with outside air.
9 cycles takes 0.36 seconds at 3000 RPM.
Can't see how enough heat would be able to transfer into the air from even a glowing manifold.
there are other benefits, though, eg more space for inlet pipe
I don't mean "my inlet feels colder", I mean actual pre/post inlet data logs?
I don't think they're effective because the volume of the inlet is relatively small (couple of litres), so the air does not sit around for long enough to be heated up, as far as I can tell.
eg let's assume the inlet is 10 litres (vastly over estimated), and the engine is at say 3000 RPM, and youre on full throttle.
let's assume a fill rate (aka VE?) of around 80%, it means that every two revs you'll suck through 80% of 2.0 litres (1.6 litres), I.e roughly 9 cycles to empty the manifold and replenish it with outside air.
9 cycles takes 0.36 seconds at 3000 RPM.
Can't see how enough heat would be able to transfer into the air from even a glowing manifold.
there are other benefits, though, eg more space for inlet pipe
#24
Scooby Regular
iTrader: (1)
If they aren't actually measuring the inlet temps or even dynoing the engine before or after, then the evidence doesn't support the theory.
#25
Scooby Regular
Id say its a gimmick if you ask me,
Money would be better spent elsewhere,
If your chasing the last .01 sec and perfected your car everywhere else then go for it but really id say its best use is spacing the mani for bigger inlet pipe
Money would be better spent elsewhere,
If your chasing the last .01 sec and perfected your car everywhere else then go for it but really id say its best use is spacing the mani for bigger inlet pipe
#28
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Harvey was very methodical about all mods that he did, recording most or all before/after readings, he was also very "in to" heat management.
Unfortunately, since his untimely passing, all that recorded information is lost to us now.
Harvey had a probe at the induction kit, and also a probe at the throttle body, monitoring/recording air temps.
Unfortunately, since his untimely passing, all that recorded information is lost to us now.
Harvey had a probe at the induction kit, and also a probe at the throttle body, monitoring/recording air temps.
#29
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Originally Posted by mickywrx
Harvey was very methodical about all mods that he did, recording most or all before/after readings, he was also very "in to" heat management.
Unfortunately, since his untimely passing, all that recorded information is lost to us now.
Harvey had a probe at the induction kit, and also a probe at the throttle body, monitoring/recording air temps.
Unfortunately, since his untimely passing, all that recorded information is lost to us now.
Harvey had a probe at the induction kit, and also a probe at the throttle body, monitoring/recording air temps.