41 replies to this topic

[yaaan]

The box looks good, but you really are so limited on space in there when i have seen the conversions. what you really need is to either have a box with twin feeds, or extend the trumpets, or change the angle of them, so that they can be up and out of the engine. Custom box shouldnt be too tricky to make.

The foam filter on the ITBs takes up a fair amount of room as well though. If a box could be manufactured to similar dimensions it might be possible. I had thought having a feed at either end with each running to either side vent might work.

To fit an airbox will reduce the noise but also reduce power as you'll need a big filter on the end (like the SC boys). IIRC Vocky suggests 5-10bhp.

Ducting from turbo (or NA vents) will be a balance between forcing air through some ducting and reducing airflow into the engine bay.

Would a filter on the end be any worse than the foam filter currently in place over the inlets?

why not a naca vent either on the rear clam, pushing more towards the engine, or up higher where the fuel filer would be on the other side.

i think there are some pics of that somewhere.

I'd seen these pictures somewhere previously but haven't been able to find them again. This is an option that I'm looking at as well but I guess the important thing is to get the air into the ITBs efficiently first and then worry about where it comes from.

[yaaan]

I had an airbox fitted to mine, itb noise was very muffled ( it probably would have passed Bedford's strict noise levels), but my engine lost 10bhp at top end of the rev range - so it was removed.

Now I have a foam Pipercross filter - rated for 300bhp, rather than the original webcon supplied item - rated at 210bhp

I originally had two cold air feeds from the vxT ears, but was not happy with them so took them off. I was planning on replacing them with improved ductwork, but that has not happened yet, however I have mounted the Denso alternator lower down on the engine so I do have the extra room for the bigger ducting. When my new engine goes into my vx I will install some new cold air ducting as well.

Losing 10hp would be a 5% loss. I'm slow enough already without losing that

What aspect of the two feeds from the ears were you not happy with? Was it inefficient?

[Bargi]

I had an airbox fitted to mine, itb noise was very muffled ( it probably would have passed Bedford's strict noise levels), but my engine lost 10bhp at top end of the rev range - so it was removed.

Now I have a foam Pipercross filter - rated for 300bhp, rather than the original webcon supplied item - rated at 210bhp

I originally had two cold air feeds from the vxT ears, but was not happy with them so took them off. I was planning on replacing them with improved ductwork, but that has not happened yet, however I have mounted the Denso alternator lower down on the engine so I do have the extra room for the bigger ducting. When my new engine goes into my vx I will install some new cold air ducting as well.

New engine?
have you broken in the current one yet!?

[Winstar]

I had an airbox fitted to mine, itb noise was very muffled ( it probably would have passed Bedford's strict noise levels), but my engine lost 10bhp at top end of the rev range - so it was removed.

Now I have a foam Pipercross filter - rated for 300bhp, rather than the original webcon supplied item - rated at 210bhp

I originally had two cold air feeds from the vxT ears, but was not happy with them so took them off. I was planning on replacing them with improved ductwork, but that has not happened yet, however I have mounted the Denso alternator lower down on the engine so I do have the extra room for the bigger ducting. When my new engine goes into my vx I will install some new cold air ducting as well.

Must have been a very badly designed one, it really shouldn't be less of a loss as you can have a larger filter area compared the localised area of a filter on top of the trumpets and giva an overall lower loss. The key is to have one that has a double plenum or a diffuser to sread the flow over the trumpets equally.

As for the OP's question what makes you think it's drawing Hot air? There are no heat soucres that side of the engine and once you're moving the air flow from the ears will fow round the top of the engine.

[FLD]

I've been thinking about this as well. Could something along these lines work? Not sure what effect this would have on the lovely induction noise, and I guess you'd have to get the box over the trumpets sized correctly.




I think Vocky was running a cold air feed at one point?

Another random idea....
Why not something like the above but with a feed from both sides. Seems like an obvious one to me. Cone filter in each ear with this in the middle.

[techieboy]

Why not something like the above but with a feed from both sides. Seems like an obvious one to me. Cone filter in each ear with this in the middle.

Think Reverie already make one in that configuration amongst their hundreds of options. As ever, space or the very real lack of it, is the issue.

Maybe speak to the Audi Elise conversion guy, Bernard Scouse, as he did loads of work on airboxes for ITB's and is probably better value than Reverie.

[yaaan]

As for the OP's question what makes you think it's drawing Hot air? There are no heat soucres that side of the engine and once you're moving the air flow from the ears will fow round the top of the engine.

I don't know that it is, I just assumed that the air in the engine bay is generally going to be warmer than the air outside of the car. I'm planning on sticking some sort of thermometer/temperature gauge in there when I get back home so should get a better idea of what is happening. If it turns out that the air flow through the bay is cool enough then I won't go any further with this. Certainly from this image it appears that there is a good amount of air flow through the engine bay; I wasn't aware that it was that effective.

[yaaan]

Why not something like the above but with a feed from both sides. Seems like an obvious one to me. Cone filter in each ear with this in the middle.

This was very much plan A version 2 but I'm not sure just how big a unit I can wedge in there. I don't see why it shouldn't work provided I can squeeze something in there that is suitably big enough.

I hate coming up with plans and ideas while I'm away from home and unable to check and see if they'd actually fit

Maybe speak to the Audi Elise conversion guy, Bernard Scouse, as he did loads of work on airboxes for ITB's and is probably better value than Reverie.

I'll try and track him down, thanks.

[techieboy]

Reverie

Bernard Scouse / Auto Teknix

[yaaan]

Incidentally, where did this come from?

[yaaan]

Reverie

Bernard Scouse / Auto Teknix

Excellent, thanks

[slindborg]

His own hard graft.... I'm very sure that Lotus didn't just sling it together and hope (in most cases) so you are trying to 'fix' an issue that isn't an issue in the grand scheme of things

[Sticky]

These fit the base plate on the ITBs

http://www.reverie.l...roup=A AIRB 4CZ

Best start saving

[yaaan]

His own hard graft....

I'm very sure that Lotus didn't just sling it together and hope (in most cases) so you are trying to 'fix' an issue that isn't an issue in the grand scheme of things

That's good to hear. I'm happy not to fix things that don't need fixing

These fit the base plate on the ITBs

http://www.reverie.l...roup=A AIRB 4CZ

Best start saving

Ouch! I'll gladly not pay that and live with things the way they are!

[vocky]

New engine?

have you broken in the current one yet!?

this one managed about 700 miles before I sold it to Joey

[davemate]

His own hard graft....

I'm very sure that Lotus didn't just sling it together and hope (in most cases) so you are trying to 'fix' an issue that isn't an issue in the grand scheme of things

That's good to hear. I'm happy not to fix things that don't need fixing

These fit the base plate on the ITBs

http://www.reverie.l...roup=A AIRB 4CZ

Best start saving

Ouch! I'll gladly not pay that and live with things the way they are!

With one of those carbon fibre kits, you could make that in a couple of days.get a piece of mdf, make a shape that would fit, job done.

I am back to bristol from early august, but would be happy to give you a hand and making some CF stuff? or even make it out of another material via a vac form?

[Winstar]

His own hard graft....

I'm very sure that Lotus didn't just sling it together and hope (in most cases) so you are trying to 'fix' an issue that isn't an issue in the grand scheme of things

I took the 3D model that siti created, spent a LONG time stiching the mess of surfaces that 3Ds created and removing all the graphic details that don't affect the flow then created a simplified representation of the internal flow regions. I've not worked on it much since the little one arrived but most of it is on type116 as I prefer not to post it on an open forum for various reasons.

Edited by Winstar, 30 July 2012 - 03:23 PM.

[Bargi]

most of it is on type116 as I prefer not to post it on an open forum for various reasons.

If only it was possible to actually get on that forum

Edited by Bargi, 30 July 2012 - 05:05 PM.

[yaaan]

I took the 3D model that siti created, spent a LONG time stiching the mess of surfaces that 3Ds created and removing all the graphic details that don't affect the flow then created a simplified representation of the internal flow regions. I've not worked on it much since the little one arrived but most of it is on type116 as I prefer not to post it on an open forum for various reasons.

Yep that sounds like a lot of hard work. Good to see stuff like that though. Thanks for posting it up.

With one of those carbon fibre kits, you could make that in a couple of days.get a piece of mdf, make a shape that would fit, job done.

I am back to bristol from early august, but would be happy to give you a hand and making some CF stuff? or even make it out of another material via a vac form?

I'm back in Bristol from the 22nd so if you're about it would be good to have a look and see what can be done. There's no harm in a bit of experimentation

[davemate]

I took the 3D model that siti created, spent a LONG time stiching the mess of surfaces that 3Ds created and removing all the graphic details that don't affect the flow then created a simplified representation of the internal flow regions. I've not worked on it much since the little one arrived but most of it is on type116 as I prefer not to post it on an open forum for various reasons.

Yep that sounds like a lot of hard work. Good to see stuff like that though. Thanks for posting it up.

With one of those carbon fibre kits, you could make that in a couple of days.get a piece of mdf, make a shape that would fit, job done.

I am back to bristol from early august, but would be happy to give you a hand and making some CF stuff? or even make it out of another material via a vac form?

I'm back in Bristol from the 22nd so if you're about it would be good to have a look and see what can be done. There's no harm in a bit of experimentation

i will drop you a pm.