Crossflow fumes

[PhilD]

Hi

I have a 1600 crossflow with a rear exit exhaust, and experience exhaust fumes coming back into the cabin, have re-routed the breather pipe which has helped a bit. Is the next step to fit or modify exhaust to side exit ?

 

Thanks for any help with this.

Phil

[John Whyman]

A side exit exhaust may help, likewise looking back at previous threads on this subject. My immediate queries are:- does your crank case breather vent to a catch bottle?. If it doesn't then fit one and a vent pipe from the bottle down under the gearbox tunnel so that engine fumes are carried away underneath.

 

If it is purely exhaust gasses then a 4-to-1 and side exit box may do the trick. Get a second opinion, I run with a side box and have never had any problems.

 

 

 

Happy Motoring. thumbsup.gif C7 WJW.

[PhilD]

John

Thanks for the reply, crank case breather goes to a catch tank with a vent placed as you suggest.

I think possibly fumes are being drawn in by the partial vacuum the car creates when moving forward, bit like a tin top with tail gate open and a flat pack Kitchen in the back !!!!!

 

Seems I need a side exit.

Phil

[John Whyman]

I know that smell so well having transported a complete flatpack kitchen thirty miles in my Beamer estate. Heady stuff and quite sick making, especially when you've got every window and the roof open as well and is p*****g with rain.

 

By the looks of Roger Kings ad in this months low flying a large keg and household flue tied up with bits of string seem to be the answer.

 

 

Happy Motoring. thumbsup.gif C7 WJW.

[Russ Jackson]

I test drove a crossflow and it stank of 'petrol sort of smell/fumes' ish... if you know hat I mean. It's common on engines with big intake K&N filters on carbs. Are you sure that it's exhaust fumes and not intake fumes that you are smelling?

[Gareth Lewis]

I had the same problem with my rear exit exhaust - changing to a side exit did the trick!

 

Gareth

[PhilD]

Russ

Thanks for the reply, I'm sure you're right, some of the smell is of petrol fumes, in fact I sometimes leave the car outside to de-fume for a while before putting it in the garage!! those K&N's do smell a bit.

But I think mostly its exhaust.

Cheers for your input Gareth, seems I should try a side exit.

[Old Septimus]

My SIII had a rear exhaust as standard when I got it and there were no problems with exhaust fumes. When I added extra radius arms to cure perennial axle bending/leakage problems (much more effective than Caterham's "plate") the exhaust had to revert to a SII side position - no fumes either. However, being a bit of an old nonce with glasses, toupe etc, I usually use the sidescreens. Without them all sorts of random eddies and backdraughts occur which may give you problems whatever the configuration of your inlet/exhaust systems.