Compression test results

[minxgirl]

hose clamps shmose clamps!!! what evahhhhh *LOL* (but thanks good to learn anything)

[Grega]

jill, the clamp has a rubber insulator around it to stop it vibrating on the car.
otherwise they make a bloody horrible noise

tell me, why did you get your carbs rebuilt in the first place?
i've a good book on dellortos and webers and it says that "too much fuel pressure can overwhelm the needle valves and cause over-rich running"

it may be also worthwhile pm'ming a fellow on here called "rodger" as he is very knowledgable on these carbs too.

[minxgirl]

jill, the clamp has a rubber insulator around it to stop it vibrating on the car.
otherwise they make a bloody horrible noise

tell me, why did you get your carbs rebuilt in the first place?

well basically the car was acting identically to the way its acting today Grega...running terrible - lumpy, lost all power, backfiring and carrying on and stuff and theyd been at me that it needed doing and I assumed they were right so three weeks later the car was ok temporarily

[Grega]

something else you can try if it is a fuel pressure thing (and there is too much)
lightly clamp the supply line to the carb (does it run shit at idle?)
and wait for a wee bit to see if it improves.
you will have to pull your plugs and clean them first as they will be fouled something savage from overfueling.

[minxgirl]

The plugs look like charcoal Grega - very ugly and useless *LOL* if this ever gets sorted I will shout the car another new set (only replaced these a month or so back) - I will give that a go when I get a moments break between weather and exams - much appreciated +rep for that...I want to solve this in my backyard if at all possible

[Grega]

just try it for a little jill ; if its overfueling this may help you. if its something else more sinister in the rebuilt carbs then it won't
remember it will take time to show up if its right though.
i'd recommend a change of oil too when you find it.

[minxgirl]

Oil change OMFG yes...

[love ke70]

how do you know there is fuel getting into your oil?
i was reading and didnt see anywehre you saying how you know that...
is the oil level rising, smelling of fuel is common for oil in older motors, due to blow by n shit. i can tell which bottle of old oil sitting around is from which of my cars (one lpg, one petrol) when i sniff them, coz one smells of lpg and one of petrol...
so yeah, what makes you say you are getting fuel in the oil?
i would be guessing that fuel pump is a lifter design, but probably running at higher than what your carbs can handle. from memory they only like about 2.5 psi dont they?
hmm there was something else i was gonna say...
owell take that and see how you go

[Grega]

lol. LPG'd oil - should come out clean as a whistle!
and yeah - 2.5psi tops

[love ke70]

hehe not this engine. came out black n gritty....
yeah, i had to rebuild it...
shoulda seen the bearings hehe

[dale30]

That pump looks very much like a high pressure efi pump as used on many late model cars.
That would explain your fuel probs.

Do yourself and your motor a big favour. Go out and buy a cheap fuel pressure guage and fit in the fuel line then turn on the ignition. If fuel pressure is more than 4PSI turn off and throw pump in bin. Go to Repco or somewhere similar and buy a new low pressure pump.
while there buy 5ltrs of Penrite HPR50 and new filter.
When all the above are fitted take it for a drive and see how it goes.
Compression rings are a bit worn and oil rings on number 3 are shot.
HPR50 will make your bearings happy and help with the oil rings on #3

The only place the petrol can get into the oil is the carbys,Since they have been rebuilt and the problem persists then it points to fuel pressure to high which will dribble when motor is turned of as well untill pressure drops below about 4 psi.

Dont panic, keep boyfriend away from car your doing fine..Check fuel pressure.!!

[TheToyman75]

Jill,

Judgeing by the adell clamp mounting the fuel pump it it probably a Pierburg item. They are a great little pump. I don't have any stats on them however Starr Performance in Victoria stock them so I am told. They are a high high volume pump but I don't for th life of me remember what pressure they run at.

I will try to find the fuel pressure you need to be running and be back soon.

[TheToyman75]

Ok, The Carbies need to be running at 2.8 - 2.3 PSI !

Its been said a few time but the very next thing you need to do is check your fuel pressure just before it enters the carby. Buy an inline guage if you want but cheap guages can give poor results so I recommned seeing if your "mechanic" has a good quality fuel pressure guage that can accuratly measure carby level fuel pressures. (Ideally you want a gauge that only reads to about 10psi so you get a really accurate reading)

If the pump is running more then that it is almost deffinatly your problem.

DO NOT ditch the pierburg pump ! it is perfect for the job ! What you do need tho is an inline fuel pressure regulator. I will check the 2TG storage lockers at my mums. I am sure I have one I can send you. Fit it inline and set the fuel pressure

If it would me I would capitalise on your being a female and call your mechanic, ask what fuel pressure your car has been tuned at. Since they diagnosed the problem and then charged you for a rebuild and tune they should know When they dont know and you can show them they stuffed up is when your boyfriend actually does become useful by gently suggesting the fit the reg I can send you. Set your base pressure and retune your carbies at no charge.

Say the word and I will copy the Solex Mikuni set up, tuning and rebuild pages in the workshop manual.

[dale30]

[QUOTE=TheToyman75]Ok, The Carbies need to be running at 2.8 - 2.3 PSI !

Buy an inline guage if you want but cheap guages can give poor results so I recommned seeing if your "mechanic" has a good quality fuel pressure guage that can accuratly measure carby level fuel pressures. (Ideally you want a gauge that only reads to about 10psi so you get a really accurate reading)

This is true but a cheap guage will still be within a pound or two and tell if its a high or low pressure pump.

[TheToyman75]

Oh, when its re-tuned they will of course fit new spark plugs which will almost deffinately make the miss go away and you can Slap your boyfriend for being a drama queen

If you need to prove a point before then you can fit new plugs to see if the missfire goes away but if its overfueling it will foul them to in no time at all and still wont run well. Fouled spark plugs are not easily "De-fouled"