losing compression

[F7R-R5]

im wondering of any 1 has any ideas, i keep losing compression on cylinders 1 and 2, more on number 1, i've checked all the stuff i can, i even thought about it being bore wash from the chipped ecu but have tryed another ecu on it,

Cheers Ben

 

[The T.I.B.]

Is that still my old 1.8 head? is it leaking through the injectors.

Tom.

 

[F7R-R5]

yea its your old head but i,ve had it skimmed and the valves re cut, it wudnt lose comp throught the injectors

 

[bbracer16valver]

he means 4 and 1 i think

one nearest cam is worst next one over is half as bad next two are fine

 

[The T.I.B.]

same prob as before u reckon?

 

[F7R-R5]

not the same really i lost compression before due to bits of metal causing the valves not to fully close, but when i fitted the willy head so i cud try getting the car to fcs it done this lost abit of compression on 3 and more on 4, thats why i rebuilt the engine in the first places cus loads of us at work thought it was due to piston rings sticking, and no i didnt snap any piston rings lol

 

[James]

is the head gasket ok and the correct one. is the block ok. is the block face flat

 

[stan]

do a leak down test to establish where its leaking from.

 

[F7R-R5]

ever thing have been done and changed, eg piston rings, shells, the block was flatned the bores were re honed,

 

[F7R-R5]

do a leak down test to establish where its leaking from.

how? lol

 

[MicKPM]

Do you mean like a "Dry" test Craig where you then stick oil down the bore and carry out a "Wet" test to see if compression increases or do you mean a "Leak" test where you're looking for compression loss as a percentage?

 

[16-valver]

r the valve clearances ok.

 

[F7R-R5]

i tryed putting oil down the bores didnt make much difference really,

 

[F7R-R5]

r the valve clearances ok.

yea they are fine i've got 2 heads and this happened before, grrrrrrr:twisted:

 

[F7R-R5]

hmm just filled the bores up with some oil span it over a few times, and got loads of comp back, hmm not sure if its a poblem with the ecu im running making it run way 2 rich, just won a prober williams ecu off flee bay guna wait till that turns up, and try agin, if not any 1 fancy a 5brid bbq lol

 

[Huw]

I fail to see how an ecu makes any difference to compression?

 

[F7R-R5]

because it could be a poor map or the chip has decided to play up and be making it to over fuel, i know before when i had it running it had loads of black smoke coming out when i revved it, plus i've got to run the engine in and over fuelling it isnt really the best way to do it,

 

[stan]

wont be ecu related.

If its gained ALOT of compression with oilo in the bores, then its ring/bore related.

A leak-down tester pressurises the cylinder at TDC, then u listen to see where its leaking from. leakage is shown as a percentage loss.

 

[sparky33]

Can you still buy piston seal?

 

[F7R-R5]

wont be ecu related.

If its gained ALOT of compression with oilo in the bores, then its ring/bore related.

A leak-down tester pressurises the cylinder at TDC, then u listen to see where its leaking from. leakage is shown as a percentage loss.

how do you pressurise the cylinders, with an air line or something? do you have anything that does the job, could it just be needs a good drive heavy foot