Technical making my self an induction kit - a pete special

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Technical making my self an induction kit - a pete special

An induction kit simply allows more air to get into the cylinders. A cold air feed is a pipe that goes from the outside, usually front, of the car to the inside to supply cool/cold air to the induction kit. They work together to get more air into the engine, the engine management system puts more fuel in to compensate and the result is a bigger bang in the pot.
 
mckcrich said:
Liam,
it was a 76-51mm reducing 90 Deg Elbow with 150mm legs (the maximum length they do) it cost me 23.50 all in but I think they missed off the VAT by mistake so you may jhave to pay a bit more. SFS are on 01582 488040.

Hope this helps.

Michael
As always Michael, v. helpful cheers!

Now I want to know the details of the plumbing bits you lengthed it with please.

Apologises for the blatant copying but since we all have the same cars it's just a little copying!

Liam
 
One wheel in the air, car in neutral, engine running, wheel spinning, car not falling of jack.

If I've got the above scenario correct, then the answer goes like this.

The gearbox is a constant mesh unit. The gears are connected to the layshaft at all times, the selecting of a gear involves sliding a collar along the main shaft to engage that gear with the mainshaft. If the gearbox oil is cold then, even with the gearbox in neutral, the input shaft will be turning because the engine is, and the drag of the oil will turn the output shaft.

In this condition, and only in this condition, you would be able to stop the spinning wheel with a gentle touch of your hand, or head, if you so choose.

If the car was in gear, then, of course the wheel would turn but the car would still not fall off the jack due to the differential sending the power to the wheel with the least resistance. That would be the one in mid air then.

Under no circumstances try and stop the wheel turning in this scenario unless you want to chase your car down the road.

The second scenario is also dependant on a standard free diff, not a limited slip one.

Cheers

D
 
bloomfieldliam said:
As always Michael, v. helpful cheers!

Now I want to know the details of the plumbing bits you lengthed it with please.

Apologises for the blatant copying but since we all have the same cars it's just a little copying!

Liam
.

Liam,
On the cinq, Its basicly two straight waste pipe extensions with screw and seal joints. (76p each) Joined with a piece of waste pipe and sealed with silicone sealant. The silicone hose is secured to the second of the waste pipe extensions with a standard jubilee clip. to secure to the plenum or "bob" I forced the "screw on" bit of the joint over the end of the plenum pipe (it needed about 1mm taking off the inside diameter and it went on with a bit of bf&i the rubber seal went on to the pipe next and this seals against the lip on the plenum pipe (I didn't use any silicone sealant as it seems airtight on its own). You could use push fit plumbing fittings but I dont think these will be as airtight and they could move with vibration.

On the sei it is the same except I used two 45 deg bends.

Very basic but it works well.

I have since had an alternative idea which would work as well. If you used a plain 90 deg 76mm elbow you may be able to use one of those stainless steel insulated mugs (just the stainless steel exterior) to achieve the reduction [just another mad thought???!!!!]

Regards,
Michael

ps imitation is sincerest form of flattery, [I copied a GSI copy from a post on here, but found an easier (and cheaper) way of making the last bit]
 
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the way i did mine was ues the same elbow as mckcrich

but i used a straight reducer as well to get over the top of the pendlum!

loads of different ways of doin it.

wat u could do is somethin like mckcrich and then take some huge ducting down to the front of the bumper and do it that way, if u leave a little gap between the filter an the ducting, even if u suck water up the ducting it shouldnt b able to jump the little cm or so gap and go into the filter. well in theory!
 
polecat said:
An induction kit simply allows more air to get into the cylinders. A cold air feed is a pipe that goes from the outside, usually front, of the car to the inside to supply cool/cold air to the induction kit. They work together to get more air into the engine, the engine management system puts more fuel in to compensate and the result is a bigger bang in the pot.
so its not ram air? cos the ram air effect only comes into its own at speeds above 120-140 mph which is why i always laff when i see superbikes with ram air intakes. all sounds like a gimmick to me. i work on jet engines so we were taught all about ram air. a jet engine is at its most efficient at standstill. efficiency drops off as speed increases until ram air comes in at above speed then its away (basically). anyway ill shut up now and stop boring everyone. :D
 
bloomfieldliam said:
Isn't the ram air you speak of to do with jet engines and the motoring equivilent is different?

http://www.ramair-filters.com/frames.html

Liam
well yes. i was just questioning the benefits of these induction kits? :confused: they obviously dont provide ram air as its impossible at the speeds cars go at.
if you connect a pipe from the front of the car to the 'bob' you run the risk of hoovering up any puddles you drive through. if you just place the same pipe up to the air filter so any water wont be inducted then youll lose any benefit so whats the point? the only way to get extra air and fuel into an engine is super/turbo charging. hasnt someone done this? :D
 
I think the difference is that this is a cold air feed rather than a standard air filter which takes the air from anywhere around the hot engine. Cold air is denser hence better for combustion. Having a feed to the front of the car properly done can achieve this and if front facing can help force the air in although not in the same way as a 500mph odd plane lol.
 
The uprated filters pose less restriction and allow more air in, but if it's drawing in hot air then that's not too good - cold air is more dense, contains more oxygen by volume and can support a bigger bang with more fuel in the pots.
 
do you not just bolt a K&N filter on for a better noise? ram air is the term im used to sorry. and youd still have to be doing 140 mph to 'force' enough air to have an effect. still, sounds like a laugh! :D
 
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