RS BINE

Hi really need sum advice before engine gets ripped t bits. done a compression test and only gettin 50psi on all four. any feedback greatly appreciated.

1223456

hi mate,

i think the reading should be around 160 - 175 depending on the state on the engine but I maybe wrong.

Could be due to some dodgy valves not sealing, im sure someone a bit more technical will post up on here but im sure 50 is not even close to what it should be, must be flat as hell to drive?

Hope it gets sorted mate

studabear

Is your compression tester a decent item, I had a cheap crappy am-tech tester off ebay, it was telling me porkies, its now in the bin.

RS BINE

Yes i thot it shudv bin 150ish. surprisingly it pulls not 2 bad it made 164bhp at 9 psi about 2 mnth ago but i didnt think it sounded healthy up the revs. cud the timing maybe out im hopin its not the rings or or sumthin but if it is im just goin t go for the rebuild

RS BINE

It was the first time it was used but maybe i shud get another 1 dun with different tester

liam-rst

iTrader: (1)

Should be around 150-160 on a healthy engine, if it was rings or something like that making it that low id expect a fucking lot of smoke and to be popping the oil cap off especially when it comes on boost as you would be filling your block with pressure, tbh mate id get a decent compression tester before I looked into anythin else

1.9 xr2 on 40's

try it on another engine
if the numbers are that low i'd expect it to need alot of turning over before it starts

or wind up the boost to 30psi

RS BINE

There is a wee bit of smoke on lift off and it pops a bit but not 2 bad starts ok aswell it was left for a month while i was offshore and fired up straight away first kick. wont boost over 10 as not chipped yet

liam-rst

iTrader: (1)

Bit of smoke on lift off is more likely the turbo, it certainly don't sound as if you have low compression, you say it pops, when did it last have a set up?

RS BINE

it was set up in july i noticed a wee smell of fuel in the oil a month ago but when i changed the oil yesterday there was no smell of fuel

haz87

What cam are you using? Solid or hydraulic?

the mk1 kid

Are you using wide open throttle during the test?

I dont think it could account for that much of a significant difference, and suspect, as already suggested, that maybe the compression tester is at fault.

Compression tests aren't the be all and end all (not as useful as a leak off/down tester for example), but that is very low!!

Tom

tizer091109

Av a chipped ecu for sale £60 and am in the broch moony if your intrested,Just remembered that your running efi haha sorry its a mfi ecu av got.

AstoN_B

iTrader: (1)

I had compression down on 3&4 it was around 65psi and wouldn't start or idle. It's possible your dynamic compression is down if you're timing is out, or a big cam etc. if it starts n drives well enough I'd say the figures are off.

My engine looks to have shat its rings cause I got a bores cope down and they look scored.

RS BINE

its an uprated cam not sure of the make but its hydraulic tappets and i changed them last month along with the stem seals. aye its efi steven cheers ony y. goin to get another test done c if there is any difference and get timing checked.

AstoN_B

iTrader: (1)

Cam overlap can make a difference, so can the engine turning over slowly as more air escapes before the valve closes, old test to check if its rings is to put a small squirt of oil down the plug hole and see if compression jumps up on next test.

m4tt274

iTrader: (2)

if it runs alright and its consistent on all four cylinders then i wouldnt worry, probably a duff tester

Rogeyboy

iTrader: (2)

I think the idea is all 4 cylinders are consistent to a point, your results seem low, But your car seems to drive fine etc. Try a drop or 2 of oil down the bores and turn it over when its hot and with the throttle wide open (un plug fuel pump fuse and coilpack) then see what you get, maybe try a diff tester too!
If its driving fine, starting well i wouldnt worry.
Does your dipstick or oil cap ever pop off/out?

RS BINE

no dipstick or oil cap never jumps out but i just know that someting isnt rite

Canada1

Something must be wrong with your gauge.
50 psi compression will definitely not start at all.

RS BINE

ok. done another test with different guage and results were. 1-130ish/2-110/3-125ish/4-130ish.

m4tt274

iTrader: (2)

the 110 result is a little bit far out from the others

Rs-jam

hi guys ive recently purchased a 1989 escort cab with an rs turbo engine fitted, all seems well with the car however when driving the car its not boosting until around 4000rpm. it has a t4 turbo fitted, ive had a fiddle with the actuator but still the same any ideas????

matthart

Hello,

It's generally considered to be slightly rude to ask questions in someone elses thread so you might want to start your own.

If it really has a T4 turbo you've answered you're own question. That turbo is too big for a 1.6 engine, it wont boost til late up the revs.

Rs-jam

hi sorry about that im new to this site and dont know how to post a thread so i thought buy talking to one of you guys who already have a rs turbo ill get the answers i need, thanks for the advice, ill start looking for a smaller turbo!

AstoN_B

iTrader: (1)

I wouldn't be TOO worried about that. I had to start mine on a rope and checked when warm, 3&4 had around 60psi. Best I got was 120.

Hence building a fresh engine, just my luck really but yours wouldn't cause me any worries.

Lowest I had was 105ish on 1&3 and around 120 on 2&4.

RS BINE

The smoke when i let off the throttle is white i think so possable heasd gasket