HELP: Leaning out??!?!

[GoLfMan]

Driving my mk1 back to back with Jarreds mk1, mine is HEAPS slower and WAY LESS responsive.

its pinging heaps althought its been timed properly and its leaning out at 5g's.

its breathless and it shouldnt be with a whopping DCOE on it and a 2" exhaust with extractors.

HELP

[Jarred]

it's also got 98 octane in the tank.

Engine is a bit of an unknown unfortunately...

[mollins]

timed properly?

its been timed properly .

how was this done? what did you use as TDC marker? flywheel marker sometimes doesnt line up if its been put on wrong.

what about plugs, leads and dizzy cap. Are these new/old/cheap-and-nasty?

have you got plenty of fuel pressure from your pump? (crap pump or dirt in tank can give lean mix)

good luck

mike

[Jarred]

have you still got that fuel pump from stu? you'll need a reg too

[GoLfMan]

how was this done? what did you use as TDC marker? flywheel marker sometimes doesnt line up if its been put on wrong.

what about plugs, leads and dizzy cap. Are these new/old/cheap-and-nasty?

have you got plenty of fuel pressure from your pump? (crap pump or dirt in tank can give lean mix)

good luck

mike

yup it was timed from the TDC marking on the flywheel.

dizzy cap, sparkies and leads all need to be replaced, how do i check the fuel pump, what if the carby is jetted wrong?

[Golf Loon]

An engine is as good as its worst companant.

Change the cap, leads and rotor for starters. Dont use crap blue leads.

I usually check the timing belt is timed properly and then with the dissy cap off, check the arm is pointing at the corner of the block. TDC marks on flywheels can be wrong.

How do you know its lean?? It could be heaps rich which will make it slow too.

[Oneofthegreats]

The engine could be a dog's breakfast!!!!

Also, one thing I've mentioned to you before. Your trying to feed a DCOE with a stock Mk1 1.6L fuel pump unregulated. Of course it might lean out. Your using more fuel than it can probably supply.

You really do need an electric fuel pump & a regulator.

Loon's also right. It's only as good as it's weakest link. I've been through this with you I think. Lead's, plug's, cap, rotor button, Point's & condensor.

Also I don't know how flywheel's can be fitted incorrectly. I honestly don't They are dowelled! Well all the ones I've removed & refitted are.

[Peter Jones]

Also I don't know how flywheel's can be fitted incorrectly. I honestly don't They are dowelled! Well all the ones I've removed & refitted are.

I don't know how either but here's proof. This is my GX with the timing mark centred in the inspection hole.






Pete

[Preen59]

Also, one thing I've mentioned to you before. Your trying to feed a DCOE with a stock Mk1 1.6L fuel pump unregulated. Of course it might lean out. Your using more fuel than it can probably supply.

I doubt it. My mk1 with a 1.7 with all the work done to it, running a 44 IDF and i'd estimate putting out around 130hp didn't have trouble with fuel supply problems. And i was using the stock pump.

[Peter Jones]

Sounds like a couple of problems there.

Firstly don't expect to get the same low rpm torque as Jarred.

His carb and manifold setup should be far more tractable. (long runners, small venturi etc)

What size venturis are in that DCOE? You might need to go a bit smaller if there's sufficient fuel pressure. You may not be creating enough vacuum to draw the fuel through.

I' try removing the T piece if it's still fitted in the fuel line, then an electric pump, then the venturis.

Pete

[Preen59]

When you apply the throttle, does the engine sound like it's gasping for air or does it just sound doughy?

If it sounds like it's gasping, it's lean.

Doughy (accompanied by black exhaust smoke) is rich.

Also if you've got too much ignition it'll seem slow and ping like hell.

If it's lean, you can get pre-ignition and hot spots in the chamber, the hot spots can cause an additional flame front, and the 'ping' sound is the 2 or more flame fronts meeting eachother.

[Oneofthegreats]

I doubt it. My mk1 with a 1.7 with all the work done to it, running a 44 IDF and i'd estimate putting out around 130hp didn't have trouble with fuel supply problems. And i was using the stock pump.

Did you have the fuel return line blocked off or have a retrictor in there?

I remember reading about your timing delima Pete. That's very weird to say the least.

[Preen59]

Did you have the fuel return line blocked off or have a retrictor in there?

I remember reading about your timing delima Pete. That's very weird to say the least.

Nope. All standard.

[Jarred]

Also if you've got too much ignition it'll seem slow and ping like hell.

.

well thats pretty much the issue i reckon, josh?

[GoLfMan]

ARGGGHHHHH its now driving me officially insane!
bought new plugs, dizzy cap (leads to come), installed them all, bipassed the fuel return line and its stillpinging like hell and well down on power.

Jarred and I stuffed around with the timing and even well retarded it was still pinging and it was still popped when it hit 5000rpm (the sound it makes when a car hits a rev limiter). Jarred ended up retarding the timing so much i struggled to get up the hill LOL!

also my thermo fan isnt working so my car nearly overheated untill i started moving... ARGGHH whens it going to end, i just want it to work like it should!

officially going insane right now, im actually considering blowing up my car.... i have RWC tommorow.