"Homemade" Plenum chamber

[Simon L]

Chaps,

Took my twin turbo'd Rover V8 powered toy to Emerald for mapping and Dave was convinced that there may be an air leak or two (as well as one or two other issues).

Now, my inlet is a reworked Rover plenum - basically all injection manifold components have been shortened and chamber converted to rear entry, and I'm seriously wondering whether I may have too little a contact patch on the plenum chamber to plenum base.

I'm sure someone on here has already made their own, and would just like a few pointers re materials, thicknesses and what was used for butterfly(ies).

Cheers

Simon

[Eliot]

cant see any photos of how you made your plenum on your site - so cant comment. Maybe the base has warped during welding?

Photos of the Westfield "factory" manifold conversion can be found here:
http://www.mez.co.uk/westfield/index.html
Under "Factory Plenum Mod"


BTW any details about the exhaust manifolds, are they adapted OEM ones?

[ramon alban]

Hello Simon

You could perform the standard range of air leak tests normally to be found in the Rover Efi tech training manuals for the various system.

You might try squirting WD40 or Plus Gas around the suspected areas and listen for air ingress or change in idle speed.

For methodical test process on all plenum air/vacuum functions for the earlier flapper system, read the PDF to be found here and adapt it to your installed system:

http://www.vintagemodelairplane.com/pag ... num01.html

[Eliot]

The other classic, is forgetting to plug the holes under the throttle where the anti-icing water jacket attached.

[ian.stewart]

Hello Simon

You could perform the standard range of air leak tests normally to be found in the Rover Efi tech training manuals for the various system.

You might try squirting WD40 or Plus Gas around the suspected areas and listen for air ingress or change in idle speed.

For methodical test process on all plenum air/vacuum functions for the earlier flapper system, read the PDF to be found here and adapt it to your installed system:

http://www.vintagemodelairplane.com/pag ... num01.html

WD40 method probably would not work if there is boost present, as the change in note is reliant in being sucked into the leaking joint and sealing it breifly,
Probably the soapy water is the easiest to use for checking boost leak,


Do you have any idea of the area where the boost is leaking, we use aerosol smoke at work for testing for air leaks on pneumatic cylinders.

[stevieturbo]

No boost at idle.....

Carb cleaner or Easystart is far better for detecting intake leaks.

WD40 etc will barely increase the idle.