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what type of dump valve do people recommend? im sure i have read somewhere that a piston type is not the correct one to use for the a series but i have seen several in action and work well.

A-series power! 1972|1310|T3 turbo|Omega pistons|Cantre main strap|Orange clutch diaphragm|AP race plate|Comp pressure plate|Lightened steel flywheel|13-row oil cooler|Vernier duplex timing gear|Phase 2 Piper cam|Green air filter|Hi boost carb needle/spring|2"Stainless exhaust|3"Play mini stainless rear box|Jack Knight s/c 4spd gearbox|Jack Knight s/c drop gears|Silicon coolant hoses|Lumenition HT leads|GAZ lowered height shocks all round|Steel flip-front|Rear safety devices cage|Group 5 arches|6x12 deep dish Minilites|Surf blue/Old english white|

Your are correct, there are problems with the piston ones.

They work ok for a while, then start to give problems


Speak to Bailey. They will tell you that their piston dumpe valves are not suitable for use on Metro Turbos (or Renault 5's).
The fuel vapours cause the seals to perish and the dump valves to seize (normally open).
Avonbar suggested that they had bailey manufacturing them a version that was suitable. When a mate of mine then asked Bailey, it was the first they had heard of it!!!

Use a normal diaphragm one. perferably with a kevlar diaphragm.

Cheaper too

Too many projects!

haha, that doesnt suprise me in the least that avonbar would make up something like that, i had the same happen to me over the cylinder heads that they supply which come from longman..except longman told me they arent supplying avonbar with their heads

ok cheers for the advice mate!

A-series power! 1972|1310|T3 turbo|Omega pistons|Cantre main strap|Orange clutch diaphragm|AP race plate|Comp pressure plate|Lightened steel flywheel|13-row oil cooler|Vernier duplex timing gear|Phase 2 Piper cam|Green air filter|Hi boost carb needle/spring|2"Stainless exhaust|3"Play mini stainless rear box|Jack Knight s/c 4spd gearbox|Jack Knight s/c drop gears|Silicon coolant hoses|Lumenition HT leads|GAZ lowered height shocks all round|Steel flip-front|Rear safety devices cage|Group 5 arches|6x12 deep dish Minilites|Surf blue/Old english white|