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[MikeyBikey]

10.2mm from memory, its at this lift that the curtain area is equal to the port area so optimum.

Did the engine over speed when the clutch let go as that's classic timing jumped and bent valve symptoms?

Thanks, that’s actually a good diagnosis. Yes the engine had overrevved, but it’s still seemed ok, until I parked up. The aftermarket ecu has a limit of 6500 but I’m sure was going higher. So if it jumped a tooth on the crank, that would throw things out a lot. And explain why every cylinder is b*ggered. 

[Migv6 le Frog Fan]

Might be worth bunging a decent pair of heads back on it and reinstalling it, by the sound of things.

[MikeyBikey]

Hi, engine man has checked the cam belt and removed the heads. Yes the belt had jumped on the crank, bending all the inlet valves. Pistons are good. He's happy to fit new valves & gaskets. Do I need new head bolts with these engines Y32SE. He's already finished for the day and I'm hoping to buy the stuff online over the weekend.

cheers

[JamesV6CDX]

Hi, engine man has checked the cam belt and removed the heads. Yes the belt had jumped on the crank, bending all the inlet valves. Pistons are good. He's happy to fit new valves & gaskets. Do I need new head bolts with these engines Y32SE. He's already finished for the day and I'm hoping to buy the stuff online over the weekend.

cheers

For the little they cost, not using new head bolts would be a false economy

[Marks DTM Calib]

You absolutely MUST use new head bolts, alloy head and torqued to their elastic point and slightly beyond 

[annihilator]

One of the Irish guys I know says they prefer the x30xe when doing conversions for the very same reason that the 3.2's tend to over rev.

[Nick W]

One of the Irish guys I know says they prefer the x30xe when doing conversions for the very same reason that the 3.2's tend to over rev.

what does that actually mean?

[456lbft]

Valve bounce/float due to inadequate spring design, then lifters pump up and valves meet pistons.  Just a guess, maybe the G cams are
 bit too much for the valve gear. Perhaps the 3.0 has more piston to valve clearance so they get away with it.  3.2 has forged crank so maybe the bottom end is better than the top. All development of that era of engine was focused on emissions not outright power.  Only the 2litre C20XE was ever designed (by Cosworth) with motorsport potential in mind. 

[Marks DTM Calib]

The only difference between the 3.0 and 3.2 that is significant for retro fitting is the engine management, its much easier to keep the ECU setup from a 3.0 than it is a 3.2.

I have said many times that the optimum setup using off the shelf bits is a 3.2 bottom end and exhaust manifolds ported 2.5/2.6 heads, 3.2 inlet setup and 3.0 engine management 

[Doctor Gollum]

There's nothing physically preventing the 3.0 wiring/sensors/ecu from being used on the 3.2 block and vice versa

[456lbft]

There's nothing physically preventing the 3.0 wiring/sensors/ecu from being used on the 3.2 block and vice versa

Very interesting, I didn't think anyone could do anything mapping wise with any of those old ecus anymore. I intend to use a standalone management system when the track toy comes together.  The hardware is cheaper than it used to be, it's the calibration time on  rolling road which costs.

[Kevin Wood]

There's nothing physically preventing the 3.0 wiring/sensors/ecu from being used on the 3.2 block and vice versa

Very interesting, I didn't think anyone could do anything mapping wise with any of those old ecus anymore. I intend to use a standalone management system when the track toy comes together.  The hardware is cheaper than it used to be, it's the calibration time on  rolling road which costs.

Get yourself a wideband lambda sensor and do it on the road.

[456lbft]

There's nothing physically preventing the 3.0 wiring/sensors/ecu from being used on the 3.2 block and vice versa

Very interesting, I didn't think anyone could do anything mapping wise with any of those old ecus anymore. I intend to use a standalone management system when the track toy comes together.  The hardware is cheaper than it used to be, it's the calibration time on  rolling road which costs.

Get yourself a wideband lambda sensor and do it on the road.

Yes, that would be better, and some management systems now have a degree of self learning from a closed loop lambda. I wish I'd worked harder at school, learning this stuff in my 50s is much harder and of limited use in the electrified world we are heading towards.  Still fun though!

[Kevin Wood]

There's nothing physically preventing the 3.0 wiring/sensors/ecu from being used on the 3.2 block and vice versa

Very interesting, I didn't think anyone could do anything mapping wise with any of those old ecus anymore. I intend to use a standalone management system when the track toy comes together.  The hardware is cheaper than it used to be, it's the calibration time on  rolling road which costs.

Get yourself a wideband lambda sensor and do it on the road.

Yes, that would be better, and some management systems now have a degree of self learning from a closed loop lambda. I wish I'd worked harder at school, learning this stuff in my 50s is much harder and of limited use in the electrified world we are heading towards.  Still fun though!

I swapped from twin DCOEs to a Megasquirt system on my Westfield and within an afternoon I had it running better than it ever did on carbs and drinking a third less fuel. All with just a wideband lambda sensor and a laptop on the passenger seat.

[MikeyBikey]

10.2mm from memory, its at this lift that the curtain area is equal to the port area so optimum.

Did the engine over speed when the clutch let go as that's classic timing jumped and bent valve symptoms?

Hi all, engine fixed.
 
All inlet valves were bent, but pistons etc all ok. Just very light kisses in the carbon. It looked Funny though, exactly the same pattern on each piston.

So new valves, gaskets, timing belt etc etc. All ready to go back in.

Mark, you might have nailed it here, we’ve been scratching our heads trying to work out how she overrevved, but of course, if the clutch had let go under heavy acceleration , the engine would have deff buzzed.