Fitting Toyota Hurricane

robin · Post by **robin** » Fri Mar 09, 2007 5:13 pm

Laminar flow is the target but at the speeds that air travels into your engine, and given the path it takes involves at least two 90 degree turns, I would be surprised if laminar flow ever happens at anything other than maybe tick over.

Cheers,
Robin

DDtB, Laminar flow is when the air travels smoothly through the pipe or whatever without eddies and other turbulence. It happens only in ideal circumstances or when the flow rate is tiny compared to the surface area ... see http://en.wikipedia.org/wiki/Laminar_flow

DDtB · Post by **DDtB** » Fri Mar 09, 2007 5:26 pm

robin wrote: Cheers,
Robin

DDtB, Laminar flow is when the air travels smoothly through the pipe or whatever without eddies and other turbulence. It happens only in ideal circumstances or when the flow rate is tiny compared to the surface area ... see http://en.wikipedia.org/wiki/Laminar_flow

Cheers Robin..... I may have to bring that one up tonight in the pub in a futile effort to appear intelligent after a few bears!

Dominic · Post by **Dominic** » Fri Mar 09, 2007 5:30 pm

DDtB wrote:
robin wrote: Cheers,
Robin

DDtB, Laminar flow is when the air travels smoothly through the pipe or whatever without eddies and other turbulence. It happens only in ideal circumstances or when the flow rate is tiny compared to the surface area ... see http://en.wikipedia.org/wiki/Laminar_flow
Cheers Robin..... I may have to bring that one up tonight in the pub in a futile effort to appear intelligent after a few bears!

First it's best to try to appear intelligent before a few beers..

robin · Post by **robin** » Fri Mar 09, 2007 5:55 pm

BTW, I think the reynolds number for the average air intake ranges from 3,000 at tick over to 300,000 at full throttle, full engine speed. As laminar flow in circular pipes is believed to occur only at reynolds numbers less than 2,000 or so, I think we're pretty safe in our assumption that it will be turbulent in our pipes

Feel free to try and pass off the maths required to compute that as your own and see how far it gets you in the pub

Robin

DDtB · Post by **DDtB** » Fri Mar 09, 2007 5:59 pm

robin wrote:BTW, I think the reynolds number for the average air intake ranges from 3,000 at tick over to 300,000 at full throttle, full engine speed. As laminar flow in circular pipes is believed to occur only at reynolds numbers less than 2,000 or so, I think we're pretty safe in our assumption that it will be turbulent in our pipes

Robin

That's exactly what I was just about to post..... typical!

mac · Post by **mac** » Fri Mar 09, 2007 6:20 pm

Reyonds is effected by the roughness of the pipe that it travels through too? or is that some other effect?

mac

DDtB · Post by **DDtB** » Fri Mar 09, 2007 6:26 pm

mac wrote:Reyonds is effected by the roughness of the pipe that it travels through too? or is that some other effect?

mac

No you are correct young man, the roughness of the pipe does have an effect.

I obviously know what I am talking about, now move along.

Rich H · Post by **Rich H** » Fri Mar 09, 2007 6:54 pm

BTW air is a fluid....

robin · Post by **robin** » Sat Mar 10, 2007 1:36 am

Reynolds number is a measure of the ratio of the inertial forces and viscous forces in a particular flow scenario. The more viscuous a fluid is, the more likely it is to travel in a laminar flow (viscous fluids resist sheer and so act more like solids, i.e. they travel like lead in a propelling pencil). The higher the inertial forces (caused primarily by the speed of travel and density of the liquid/gas), the more chance there is of disrupting the laminar flow and triggering turbulence; once it's there it will continue to disrupt the flow.

No doubt the friction forces will also have a particular effect on the overall flow achieved and may contribute to a slighly earlier break out of turbulence, but they do not contribute directly to the Reynolds number - it's an inexact science for sure - the only way to get any exact answers for turbulent flows is to use computer simulation at more-or-less the molecular level, I believe (at least that's how wikipedia explains it).

Cheers,
Robin

mac · Post by **mac** » Sat Mar 10, 2007 10:00 am

Indeed - we use reynolds to adjust for temperature difference - most flow calcs use on the railway is for water at 15c and then a different modification factor for the roughness of the pipe.

It's all to determine how much fluid can travel though a drainage pipe should it be subjected to full bore capacity.

It also helps in determining if the drain with be self cleaning or self damaging.

Mac

ngaff1 · Post by **ngaff1** » Tue Mar 13, 2007 7:55 pm

Ordered a Hurricane today, should have it by the weekend.

Dezzy, your descriptions should save me a bit pain, thanks

Looking forward to hearing the effects

I've got the '06 spec fly by wire which I've heard of some problems with the induction kits but Gearys supplier says he's unaware of any problems. Fingers crossed.

dezzy · Post by **dezzy** » Tue Mar 13, 2007 9:06 pm

Neil, if I get the chance, I'll post my full instructions up before the weekend. Still ain't got round to it yet, but hopefully the points above should help.

Main points are:

- angled screwdriver to access the MAF sensor
- lots of WD40 for seized bolts, etc.
- take the wheel and arch liner off before trying to remove the airbox
- try not to snap the vacuum solenod (first "sensor" you remove) when unscrewing the mount!

D

ngaff1 · Post by **ngaff1** » Tue Mar 13, 2007 9:17 pm

Thanks Dezzy.
Complete novice so any guidance welcome.

dezzy · Post by **dezzy** » Thu Mar 15, 2007 9:39 pm

Neil, I've posted my instructions here: http://www.scottishelises.com/phpbb/vie ... highlight=

Use these along with the supplied instructions.

Cheers,
D