2000 Tc engine doesn't run

[mirafiori76]

That's the toothed round thing on the end of the the cam. It's driven by the belt.

[mirafiori76]

Timing isn't wrong. Tried all positions of distributor. Somewhere between flames from carburetors and from exhaust there should be a point the engine fires. But it just won't!!!!!!!!!!!!!!! I know. I'm a mechanic for 25 years!!!

[fiat131sport82]

OH you mean CAM PULLEY or if adjustable is a VERNIER PULEY? this is how i call it i never hear of adjustable cam rod ! !  



Please write every part thats is NOT STANDARD fiat t cam and we will find foult.
thanks freind we will fix her  
suljo m

[mirafiori76]

Sorry, for my english isn't always that good
Here we go:
Twin 44 Weber carburetors on 125 inlet manifold.
Lancia cylinder head with bigger valves
Adjustable pulleys!
Inlet cam 131 Racing, outlet 132 with electronic distributor 
Standard outletmanifold (yet) standard exhaust (for looks)

[fiat131sport82]

Hi everybody,
I have a serious problem even since I am a Fiat mechanic for 25 years and am rebuilding a group 4 car.
I have a 1978 (one of the first) 131 Racing which won't run. The engine simply doesn't start. I already checked timing and compression, changed cilinder-head, double carbs, complete ignition but it won't run. Towed it three blocks and changed ignition-timing several times. Somewhere between big flames coming from the carbs and big bangs from the exhaust there must be a moment that the engine will run, I think. Does anybody have a suggestion? What am I missing here?
This engine has the following: race-cams with adjustable camwheels,
                                                bigger valves which are perfectly timed.
                                                new timing belt, timing ok
                                                new ignition coil, new cables and sparkplugs
                                                new distributor
                                                double 44 carbs which can breath freely
                                                4-2-1 exhaust manifold

HEEEEEEEELP
Thanks,

Mike

you say first race cam and now Inlet cam 131 Racing, outlet 132 with electronic distributor   
what cams is fit and is inlet and exhoust right no mix up 

[fiat131sport82]

and you say 4,2,1 ex manifold then say cast ?? standard?? which is it freind
suljo m

[mirafiori76]

You're right. It's a difficult story. Inlet cam is from 131 Sport but not the original. It's modified. Same counts for outlet cam. Trust me on this one. They are both good for about extra 30 bhp together with the lifting of bigger valves. But that's not the problem.
The problem is in the spark, wrong time, not big enough, anything. I don't know.

[mirafiori76]

At this moment I changed the exhaust manifold back to standard. I'm trying anything to get the engine running.

[fiat131sport82]

ok but we need real informations and set ups to help
actually i tell you the truth, to fix it you need to see it, its crazy try to fix a engine on internet you needs to be with is in real life knows what i mean  speculations never can fix like ill persons need to see doctor no check forum good luck! 
suljo m

[mirafiori76]

There I was tonight, giving it another go. Exchanged two coils. O yes, coughing from the carburetors and big blasts from the tailpipe... Somewhere in between there should be a firing point. Nothing again.
But I noticed, while trying to start the engine, that the ground cable from the battery gets very hot. So I took a piece of sandpaper and cleared the connection points. Didn't help. Then it got to dark to continue.

[djape1977]

ground the engine directly from the head to battery negative

[mirafiori76]

From the head? What do you mean?

[djape1977]

take a big fat piece of wire and connect the nearest part of the engine directly to battery. shortest way should be from one of exaust manifold studs.

[mirafiori76]

What good would that do? Ground cable is fine and it's an original one. And since I cleared the connections again tonight I know it works fine. I'm going to have another look at the starter motor for I think this is the problem of the wire getting hot. I don't think this has anything to do with the engine not firing. Please state if you think otherwise. I'm staying open for suggestions.
Thanks,

Mike

[131 Devon Dave]

Are  we sure the actual cam timing or the cam profiles are ok? With all the back firing it may be the cams to piston is not where it needs to be. The cam timing marks may line up but the lobes may be opening the valves in the wrong place