Air filter arrangement...comments please!
Discussion
Got sick of the snakes pipe arrangement on the V8S, so decided to fit it straight on to the AFM. Its nice Green 'powerflow' one rated to 352bhp. Just need to get a air box around it now, to try to stop some of the wild heat when stationary, not very often btw 
.
Harry
>>> Edited by HarryW on Sunday 27th June 22:11
. Harry
>>> Edited by HarryW on Sunday 27th June 22:11
Very interested to see this Harry. I have been thinking about doing simlar with my V8S for a while now as the original air inlet seems very long and tortuous, not to mention very close to the exhaust manifold. If you come up with a cunning plan re the air box then please post it.
I remember a previous post on the same topic. GreenV8S mentioned that he had done simlar also. Would be good to see any photos he might have. If I remember correctly it was stated that the area at the base of the windscreen is a high pressure area. If a short section of the bonnet to scuttle rubber seal were to be removed it should create an ample supply of 'fresh' air for your improved breathing.
What size/spec filter is that exactly? Did it go straight onto the AFM?
Pete
I remember a previous post on the same topic. GreenV8S mentioned that he had done simlar also. Would be good to see any photos he might have. If I remember correctly it was stated that the area at the base of the windscreen is a high pressure area. If a short section of the bonnet to scuttle rubber seal were to be removed it should create an ample supply of 'fresh' air for your improved breathing.
What size/spec filter is that exactly? Did it go straight onto the AFM?
Pete
Took advice from PeterH on this, as he has had an air box for some time and I'm sure he won't mind me posting a pic here.
The filter is a green AC1.80 which has 80mm collar which starts at 140mm dia and tapers to 120mm at the end. As I said in the previous post it is rated at 352bhp, which may be too high for some but my way of thinking is if it slightly dirty it ain't gonna affect it's flow.
I've currently used the existing AFM adapter that fitted the pipework, but thathas a 75mm throat to it so means the filter has to tightened up abit to fit. I'll change it to 80mm when I build an air box.
As another thought the 140mm dia may not fit on standard and may foul the inner arch underneath. As my plenum sits 12mm higher than standard.
PeterH's air box
Harry
The filter is a green AC1.80 which has 80mm collar which starts at 140mm dia and tapers to 120mm at the end. As I said in the previous post it is rated at 352bhp, which may be too high for some but my way of thinking is if it slightly dirty it ain't gonna affect it's flow
. I've currently used the existing AFM adapter that fitted the pipework, but thathas a 75mm throat to it so means the filter has to tightened up abit to fit. I'll change it to 80mm when I build an air box.
As another thought the 140mm dia may not fit on standard and may foul the inner arch underneath. As my plenum sits 12mm higher than standard.
PeterH's air box
Harry
HarryW said:
Just need to get a air box around it now, to try to stop some of the wild heat when stationary..
Airbox.. Hmm.. The last owner of my S3C replaced whatever was there with 2 K&N cone filters which are just sat there with no airbox around them.. Do I really need one? Whats the airbox do? What am I missing..
Psychobert said:
Airbox.. Hmm.. The last owner of my S3C replaced whatever was there with 2 K&N cone filters which are just sat there with no airbox around them.. Do I really need one? Whats the airbox do? What am I missing..
Although not completely necessary, an air box would isolate the air filter/intake from the heat of the engine bay. If you can then effectively provide a good source of 'cool' air into the airbox the engine/performance will benefit.
Podie said:
You can get cone filters which are surrounded (often in carbon fibre) with hoses attached to them to direct the flow correctly... do a search in google for "Pipercross Viper"...
The only trouble there is that the arrangement will not be disimilar to the stock TVR one, just with the filter in a different place.
I suppose the best source of high pressure air would be to mount a large "dragster" style scoop on the bonnet. Cutting holes is only for the very brave IMHO.
z_chromozone said:
You can get cone filters which are surrounded (often in carbon fibre) with hoses attached to them to direct the flow correctly... do a search in google for "Pipercross Viper"...
The only trouble there is that the arrangement will not be disimilar to the stock TVR one, just with the filter in a different place.
I suppose the best source of high pressure air would be to mount a large "dragster" style scoop on the bonnet. Cutting holes is only for the very brave IMHO.
The carbon fibre protects against the heat... whilst the air tube is connected directly to the filter, so no air is "lost"... as to the source of the air, then yes there may still be an issue.
greenv8s said:
Looks good Harry. Do you have any trouble with the engine trying to pull the hose off the air flow when the engine rocks? On mine I used a short piece of convoluted hose to take up the movement.
Ah what you can't see is that the AFM and filter assembly are being held in the air (supported in free space) by the short section of silicon hose between the AFM and plenum. Even the AFM to filter existing braket is suported by it as well
. Agree though it will make it slightly difficult when I put the air box on though
Harry
pstruck said:
Airbox.. Hmm.. The last owner of my S3C replaced whatever was there with 2 K&N cone filters which are just sat there with no airbox around them.. Do I really need one? Whats the airbox do? What am I missing..
Although not completely necessary, an air box would isolate the air filter/intake from the heat of the engine bay. If you can then effectively provide a good source of 'cool' air into the airbox the engine/performance will benefit.
Thats how I understand it, the rear of the engine bay has a cold air blast from the high pressure of the windscreen once rolling. The idea is to catch that with the air box, whilst protecting it from the heat soak whislt standing still. I may also use the passenger cold air feed pipe, fed by a loverly ram scoop in the lower grill to give it a bit more. On advice I'm getting a temperature monitor to check this all out on the move.
It has to be said though having driven the car a few times now its worth doing just to hear the induction suck as you plant the throttle
. I haven't noticed any fluffyness of the engine due to heat soak yet either, however experience has shown me that excessive heat into the intake can knock off 20-30 bhp on V8S
. Harry
HarryW said:
Thats how I understand it, the rear of the engine bay has a cold air blast from the high pressure of the windscreen once rolling. The idea is to catch that with the air box, whilst protecting it from the heat soak whislt standing still. I may also use the passenger cold air feed pipe, fed by a loverly ram scoop in the lower grill to give it a bit more. On advice I'm getting a temperature monitor to check this all out on the move.
Thanks Harry.. Let me know how that goes. The S is just about to head in for a new nose and there are one or two tidy up jobs I've been thinking of.. This could be one of them..
shnozz said:
always found that weird on yours when we compared cars didnt we. at least the answer has been explained a little more now...
Might explain a number of things about the performance too.. I've felt the filters after a long run and they don't half get hot. Thinking of diverting the air intakes from the front towards the brakes as there is little point in them coming to the cockpit as the lids always off.. If thats not needed, then I'll certainly point one towards the airfilter.
shnozz said:
Psycho - have you sorted out Pistonfest or is it the usual last minute affair? Is Chris coming along?
LOL.. Deliberately not sorted it earlier as I feared I'd not be able to come out to play. Long story, work and an MBA exam looming so I doubt I'll be there. Hoping to pop down on Sunday, but won't be there for the main event I'm afraid..
RudeGirl and WH know more of the details.. Looks like Chris may well be there though. I'll send him in your direction if he makes it along..
BTW, he left Le Mans thinking he'd quite like a 4L Chimera, and now is looking for a 5L Griff. Another convert to TVR..
Psychobert said:
always found that weird on yours when we compared cars didnt we. at least the answer has been explained a little more now...
Might explain a number of things about the performance too.. I've felt the filters after a long run and they don't half get hot. Thinking of diverting the air intakes from the front towards the brakes as there is little point in them coming to the cockpit as the lids always off.. If thats not needed, then I'll certainly point one towards the airfilter.
shnozz said:
Psycho - have you sorted out Pistonfest or is it the usual last minute affair? Is Chris coming along?
LOL.. Deliberately not sorted it earlier as I feared I'd not be able to come out to play. Long story, work and an MBA exam looming so I doubt I'll be there. Hoping to pop down on Sunday, but won't be there for the main event I'm afraid..
Looks like Chris may well be there though. I'll send him in your direction if he makes it along..
BTW, he left Le Mans thinking he'd quite like a 4L Chimera, and now is looking for a 5L Griff. Another convert to TVR..
ok mate - shame you wont be there but hope you make it sunday.
glad chris had a good time. his initial reaction to the Griff seemed to be that he was impressed by the speed
it probably helps being driven by someone nuttier than a 20lbs fruitcake mind you... nice that i showed him how sloooow the 4 litre chims can be too....
shnozz said:
ok mate - shame you wont be there but hope you make it sunday.
glad chris had a good time. his initial reaction to the Griff seemed to be that he was impressed by the speed
nice that i showed him how sloooow the 4 litre chims can be too....
Will do my best to get there.. Things are a bit tight at the moment, give you a call and let you know.. No news on the insurance yet..
Chris was very happy with the Chim, infact was wondering about that or a V8S. I suspect that now his gf has decreed she's never drive it, (clever chap, must ask how he did that), he feels safe to go for the bigger engine..
Back on topic now for a minute - anyone have rough dimensions for the air box? I'm wondering how much air needs to get in, don't want to end up strangling the engine. At the moment, I('ve pretty well free flow in, (cones are just attached to the end of the plenum with nothing around them..)
Psychobert said:
Back on topic now for a minute - anyone have rough dimensions for the air box? I'm wondering how much air needs to get in, don't want to end up strangling the engine. At the moment, I('ve pretty well free flow in, (cones are just attached to the end of the plenum with nothing around them..)
Burt even cones have a max bhp rating, determined by the surface area and 'breathability' of the filter medium. Shall we just say in my case for the physical space available I would have settled for smaller filter. These in theory 'may' have done, however I was very concerned about strangling the engine breathing
. Harry
PS if you look at PeterH's one below, I did think it may have been marginal, given the power he was putting out
>> Edited by HarryW on Wednesday 30th June 21:15
I have been looking under my bonnet tonight and taking a few measurements, following on from the previous posts here.
Harry, it looks as though you have shortened the length of pipe between the AFM and the plenum. I have the 'ribbed' type pipe here and it has to be twice the length (Podie!). My AFM seems to be mounted further over and therefore reduces the amount of available space for mounting a filter. Think I'll move it over a bit.
Also, difficuly to measure, but there isn't a great deal of 'headroom' between the closed bonnet and the bulkhead shelf. Does kind of limit my options, especially as I'm keen to conjour up something similar the Peter H with his air-box.
Harry, it looks as though you have shortened the length of pipe between the AFM and the plenum. I have the 'ribbed' type pipe here and it has to be twice the length (Podie!). My AFM seems to be mounted further over and therefore reduces the amount of available space for mounting a filter. Think I'll move it over a bit.
Also, difficuly to measure, but there isn't a great deal of 'headroom' between the closed bonnet and the bulkhead shelf. Does kind of limit my options, especially as I'm keen to conjour up something similar the Peter H with his air-box.
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