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Old 10-01-2015, 03:37 PM   #21 (permalink)
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As Theodor lives outside, and will be ruthlessly started early on the freezing winter mornings, I recently got a used thermostatic warm air intake, part number 6N0 129 608 C for VW Polo and Lupo:


^^ The long lead takes hot air from the exhaust manifold, the shorter lead on the left is the cold air intake, the right side leads to the engine.

I've tested it with a hairdryer and it works. It is a bit slow, but the internal flap can completely close either intake.

The warmer intake air will allow better FE, and shorten warm up times.

But, I need to hack to fit Theo. Here is the stock intake:


The main part of the device is angled nicely, so it should be easy to splice in:


Unfortunately the HAI leg is angled up instead of down, and the plastic is welded to the rest of the device, so it cannot be rotated (that would make it too easy). I'll have to cut it and attach metal plumbing.

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e·co·mod·ding: the art of turning vehicles into what they should be

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Piwoslaw's Peugeot 307sw modding thread

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Old 10-02-2015, 02:04 AM   #22 (permalink)
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If you flip it upside down, shouldn't the piece of flex pipe be able to connect?? The WAI pipe would be around the cat then from the looks of it.

IDK, things in pictures are much simpler than when they are in front of you!
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Old 10-02-2015, 08:18 AM   #23 (permalink)
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Do you think that installing such intake in a car with LPG is a good idea?
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Old 10-04-2015, 11:57 AM   #24 (permalink)
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Quote:
Originally Posted by BabyDiesel View Post
If you flip it upside down, shouldn't the piece of flex pipe be able to connect?? The WAI pipe would be around the cat then from the looks of it.
You mean like this?

Then yes, the HAI is pointing down, but away from the engine

The only way to rotate is around the end which goes to the air filter, as that cannot really be moved to far. The CAI can be anywhere in the front, the HAI has to be coming from the exhaust manifold.

I removed a piece of the stock intake and roughly fit the t-stat WAI in its place:


Not bad. The engine side will need a rubber adaptor, the CAI nozzle may be moved a few cm, but the HAI will get chopped. I have to devise a metal ending that will bolt to the manifold.

Here are the insides:




Quote:
Originally Posted by gafhj View Post
Do you think that installing such intake in a car with LPG is a good idea?
I am not familiar with how different the combustion process of LPG is (compared to petrol), but I assume that it would benefit from warmer intake air. And the reason a t-stat WAI is better than a straight hot air intake is that the air is not too hot, so knocking is not a problem.
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e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

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Old 10-05-2015, 04:24 AM   #25 (permalink)
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Quote:
Originally Posted by Piwoslaw View Post
I am not familiar with how different the combustion process of LPG is (compared to petrol), but I assume that it would benefit from warmer intake air. And the reason a t-stat WAI is better than a straight hot air intake is that the air is not too hot, so knocking is not a problem.
LPG burns hotter and knocking is exactly what I'm afraid of and I wouldn't even consider a straight WAI. Still, this looks like a fairly safe bet...

ADDED:
Damn, a possible improvement is gone. My Fabia has it already. Adjusting temperatures would be possible, but probably not worthwhile.

Last edited by gafhj; 10-05-2015 at 05:35 AM..
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Old 12-27-2015, 03:01 PM   #26 (permalink)
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I got some time today, and the weather and planets' positions were just right, so I finally installed the thermostatic WAI:

As you can see, it just barely fits between the radiator and the exhaust manifold. Two things still need to be done:
  1. I had to cut the angle off the HAI lead, so it is just a stub over the exhaust manifold. I'll have to concoct a downward-facing funnel to better collect the hot air.
  2. The slinky tubing on right end of the t-stat is actually a suspension boot/protector from an old Citroen. I was not able to secure it, so it's just holding on by itself. Time will show if this is enough to withstand vibrations.
So far I haven't had a chance to drive Theo, I only started the engine to check whether vibrations may be a problem.
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e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

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Old 12-30-2015, 03:15 PM   #27 (permalink)
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I drove the Wife home from work today, so had a chance to monitor intake air temperatures. They hovered around +10C (+9C while driving, upping to +13C when going very slow), with an outdoor temp of -4C. Last time I drove Theodor IAT was also around +10C, but outdoor temp was between +5C and +10C.

I was expecting them to be higher, as this was normal for when I disconnect the stock intake's external nozzle. So either:
  1. the new t-stat's hot side needs a collection funnel, or
  2. the slinky tubing fell out, disconnecting the t-stat from the air filter
Upon returning home, it turned out to be 2.

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e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

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