rickbartlett

as above,done a comp test on my rst cab and i got 90 100 125 50.
been told if i do a blow by test i can find out if its rings or a head problem?

john_p_b

iTrader: (4)

basically you put compressed air into the cylinder and check where it's leaking to/from.

rickbartlett

do most garages do it?

badnews

with comps like that it is a rebuild no need for another test it is time to strip the mota, cylinder leak down test is to find the area of leak be it rings valve or gasket. not much point with the comps you have it needs striping for a rebuild, go through the head and regrind the valves reface the head then rebuild the bottom end.

AlexF

Rick - not all but lots of places can...

all it will tell you is wether its your valves or bores that are knackered.

Sadly its not likly to be a head gasket or anything minor.

alex

rickbartlett

i reground valves in last week and replaced head gasket so looks like its defintely rings

badnews

with the readings you have i would say it is worn bores chap the old cvh cops a floging and with worn ring lans and fooked rings the pistons start to break up wich combined with boost soon show readings like you have. turn the boost up on an old cvh and it will pop with out fail. no point in doing another test chap either way its a strip down i very much dout it is head issues it would be more like broken or worn out rings.

rickbartlett

update,
ive just drove home from work with a mate folowing me and he dont reckon its rings as it ent smoking that much.car fires up 1st flick of the key aswell.but the car is quite flat to drive,does anyone think it could b a head problem?

AlexF

As above...

Its either your valves arnt sealing - or your piston rings arnt.

alex

B1G_RST

iTrader: (1)

when u regound the valve it may not have been don right, thus leaking through th valve, it might not be seatin correctly

Caprigirl

do a wet compression test , a small amount of oil into each cylinder then re do the test , if its the same it not rings , if it considerably higher then its the bottom end ,

rickbartlett

definitely worth trying this

DazC

iTrader: (1)

just because it's not smoking doesn't mean your compression rings are not worn or broke or stuck in the groove with excess carbon build up. i'd say rings but do a wet test as above to confirm.