4200 & GS induction system development

2b1ask1

Special case
Messages
20,262
Well I've failed to move this project any further since the above so following many enquiries and discussions at the Vulcan hanger this is what I have setup on mine and have since the Modena trip without issue:

The induction is 92mm I.D. so you need a single straight joiner to go into the air filter and to the silicone hose; if you want to make this yourself you can go exact size 92mm for hose to 95mm for air filter (filter will crush easily onto 92mm though.

go to http://www.sfsperformance.co.uk/hose_joiner.asp for 250mm length of 92mm I.D. induction hose straight.

Also 3 x clamps (stainless steel) for the above.

http://www.knfilters.co.uk/search/product.aspx?prod=RC-8480 This filter will be fine, it has an offset on the bottom but no problem and it will be the one we will use most likely.

You also need to find a 500mm long 10mm cable tie as you will need to tie the filter to the headlamp bracket in the wing.

You need to remove the old airbox and one option is to cut the top pipe off and rip the box out (scrap) or;

2 hours; nearside front wheel off, arch liner out, under tray off. Then nearside headlight out, grill out, undo main bumper bolts inside grill, undo 3 x M10 fixings down the side of headlight to release bumper from wing (front one is a ******* & may well snap as it is Italian and a stud). Next remove wing to bumper bolts in bonnet shut, small film sticker at same and then row of bolts across bonnet shut but note all spacers underneath!

Swing bumper out enough to remove air box, retained by 3 x rubber mounts (these will be perished and will tear easily) undo airbox from MAF.

Simply fit straight pipe to MAF, filter to straight pipe and strap to headlight bracket & refit bumper etc... Good luck :)
 

Wack61

Member
Messages
8,787
overheating shouldn't be a problem as this is only likely to be occurring without a secondary issue if you are stuck in heavy traffic on a stinking hot day.

Or in a TVR going to newby hall

You're not wrong about the air filter box, mine is held in with cable ties, it does have a 3 inch horizontal slot cut into it on the wheel side which i presume somebody has added to aid air flow at some point
 

2b1ask1

Special case
Messages
20,262
Or in a TVR going to newby hall

You're not wrong about the air filter box, mine is held in with cable ties, it does have a 3 inch horizontal slot cut into it on the wheel side which i presume somebody has added to aid air flow at some point

That may well be to let water out in an attempt to avoid hydroloc! The intake placed as low as it is is such a big worry.
 

2b1ask1

Special case
Messages
20,262
Well I've failed to move this project any further since the above so following many enquiries and discussions at the Vulcan hanger this is what I have setup on mine and have since the Modena trip without issue:

The induction is 92mm I.D. so you need a single straight joiner to go into the air filter and to the silicone hose; if you want to make this yourself you can go exact size 92mm for hose to 95mm for air filter (filter will crush easily onto 92mm though.

go to http://www.sfsperformance.co.uk/hose_joiner.asp for 250mm length of 92mm I.D. induction hose straight.

Also 3 x clamps (stainless steel) for the above.

http://www.knfilters.co.uk/search/product.aspx?prod=RC-8480 This filter will be fine, it has an offset on the bottom but no problem and it will be the one we will use most likely.

You also need to find a 500mm long 10mm cable tie as you will need to tie the filter to the headlamp bracket in the wing.

You need to remove the old airbox and one option is to cut the top pipe off and rip the box out (scrap) or;

2 hours; nearside front wheel off, arch liner out, under tray off. Then nearside headlight out, grill out, undo main bumper bolts inside grill, undo 3 x M10 fixings down the side of headlight to release bumper from wing (front one is a ******* & may well snap as it is Italian and a stud). Next remove wing to bumper bolts in bonnet shut, small film sticker at same and then row of bolts across bonnet shut but note all spacers underneath!

Swing bumper out enough to remove air box, retained by 3 x rubber mounts (these will be perished and will tear easily) undo airbox from MAF.

Simply fit straight pipe to MAF, filter to straight pipe and strap to headlight bracket & refit bumper etc... Good luck :)

Can't remember who was asking me about induction mod for a 4200 classico so here is all the detail bumped!

I really need to get going on the GS variant :D
 

JimBlob

Member
Messages
121
Did anyone come up with a good mod for the induction for the GS?
(I'm very aware of the low exposure of the intake & I'm swerving puddles everywhere in the UK - ironic as I love driving through puddles!)
 

2b1ask1

Special case
Messages
20,262
At this point, I have simply ripped out the whole airbox and connected to the MAF with the straight pipe as above. The next level on the GS is to add an elbow through the cowling in front of the radiator and front it with a velocity stack either in front of or behind the grille. This however would wreck the cowling and likely any resale. Another option would be to go for a custom built hi efficiency radiator that could be notched or just narrower to allow an intake directly behind the grille but I haven't heard of anyone attempting that yet.