Discuss here about Yoeddynz's little Imp project...

[yoeddynz]

11 hours ago, Alfashark said:

How well sealed is your shift linkage tunnel at the cabin end

Yes one heard others have the same issue. Especially with engines that have pull leaks onto hot bits and generally smokey engines. 

I'd already sealed my shifter up a year ago in a bid to stop this issue. But I'm now wondering about the perished handbrake boot so I'll investigate that. 

Also realised the entry point for the rad pipes from the engine bay are barely sealed so that's a spot to work on too. 

[Mof]

14 hours ago, yoeddynz said:

Oh we at oldschool know all about hot boxing - just ask the owner of the holden panel van at coro nats.. 🥳

You need a bunch of vapers to come sit in it

[alfalfa]

Could you somehow hang some kind of smoke generator next to the exhaust tips and drive around with a passenger looking for any wisps of smoke that enter the cabin?

[yoeddynz]

2 hours ago, alfalfa said:

smoke generator

Like this... 

Its a possibility I guess. 

[ThePog]

Just put a perforated box inside the exhaust tip, fill it with weed and let your no doubt finely attuned nose lead you to the source.

Treat it like you are at a house party in 1992, and get a whiff of something out the back and bolt after it like a bloodhound.

[fuzzy-hair-man]

I tried to find some aero results and found some photos of wind tunnel wool tufting, but I think the wind tunnel was off, so not valid. I say think because the A pillar is probably sharply angled enough that the majority of the side is separated flow, could it be sucking fumes from the exhaust to the open windows?

I seem to remember you had a centre exit, was it any better? What about tipped down exhaust tips aiming the exhaust into the air flowing under the car rather than the wake from tyres and the side that might be eddying up?

[yoeddynz]

The centre exit was much worse (at the time because there were other elements at play then such as a still rich tune etc) 

@ThePog I love your suggestion. I'll let you know when the party is abut to begin. You'll have to dress in your finest 1992 baggy jeans and associated nirvana spec tee. 

[yoeddynz]

37 minutes ago, fuzzy-hair-man said:

What about tipped down exhaust tips aiming the exhaust into the air flowing under the car 

Oh and yeah I've tried that too. It sounded really cool but apart from the fact it was still fumey I couldn't deal with all the gang sign dudes with big shorts and singlets, socks and jandals exclaiming "mean pulse bro"

[locost_bryan]

Don't believe anything Gordon Murray says in your dreams, he was a dedicated fwd man and he'll be trying to send you up the garden path (backwards).

[Roman]

A++ post, many lolz 

[yoeddynz]

I'll tell Gordon you find him funny 🥸

[Gordon Murray]

Hello Alex, thanks for the great night brain storming. I am so pleased you are serious about this undertaking. When the hangover wore off I was struck with inspiration. The answer is as simple as it is genius. You need to run a tank of 2 stroke mix at a solid 20:1. This will certainly allow you to pinpoint the ingress point of the fumes.

What I never let on in the Imp’s racing development is that we actually ran a little water in the front tyres to increase road holding, a little trick I remember from the days on the farm near Durban.

Also, if you want to develop what we talked about with regard to pressures etc, have you considered a giant NOS system? Locating the cylinder in the frunk would have the double benefit of increasing front grip if you would rather not run water. Excess NOS can be bled off to create high pressure in the engine bay.

 

Regards,

Gordon.

[igor]

1 hour ago, Gordon Murray said:

Excess NOS can be bled off to induce a high in the driver

 

[ajg193]

I was having a yarn with Ralph Nader about your car's fume issues the other day. He reckons the best way to fix it is to replace that flat six with a Leaf motor.

[Bongo Boy]

Easy. 

[locost_bryan]

Was talking to Gordon, and he said you should take inspiration from one of his old ideas.

[Nominal]

I reckon this might be better, exhausts right behind rear window before the deck lid.

 

[Roman]

I've been thinking about this, fumes can only enter the cabin if the cabin pressure is lower than the pressure point where the fumes are. 
So all you need to do is reverse the pressure differential!
So your cabin is always leaking "out" instead of "in". 

I've found online that some old muscle cars had this same problem.
They solved it by attaching an air pump to the engine, that is presumably used to pressurize the cabin in proportion to engine RPM.
The RX4 must have the same problem as @dabuzz used this solution recently.
Here is an AI generated concept drawing of how it might work

[Tiger Tamer]

Just take the front and rear windscreens out. it will go faster and then you won’t need your motorbike .You won’t need a helmet so you can feel all the wind blowing through your hair.

[ThePog]