C3 Yates on AU2

[Blu302]

I have been working on my daily driver repair for just over 12 months. It decided to chew Cyl 8 Ex valve spring for a second time in 12 months . Turns out that the factory GT40P heads don't like 0.540" lift.

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The "old" good springs

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The replacements.


New heads didn't accept the old intake, so I had to source a new(second hand) intake to suit

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Turned up with Carbon fiber ram tubes Yay!!!!

The old setup made 200rwKw with M800, I wonder what the new ones will make with 100cfm more intake flow at 0.500" lift?

[Blu302]

Here's the head flow data

Port Flow-Skip Hubbard Heads.pdf

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Any ideas in the possible Hp with 0.510" lift?

[Blu302]

I've sourced a supercar front bar but had no luck on finding the rear wing from the same racing period.
Anyone have any ideas where I could find or have made?

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[Blu302]

While registering the car, I had an engine bay fire.....R.I.P

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[20B]

Ah you must be gutted !
Lesson number one, carbon fibre and fuel systems don't mix especially prototype versions that haven't been tested. Unfortunately I have seen a few cars now with engine fires that had 'home made' style carbon intake manifolds.
Going to rebuild ?
Good time to pull out that molten wiring and add a PDM

[Holmz]

You can get fuel stand of with the high injectors, but hi-li is not easy with only 8 injector drivers.
Was the fire from the fuel system as designed or was there a leak ?

[Blu302]

The whole system was from one of the old fujitsu series supercars, heads right through to the trumpets.

It appears that it was from the wasted spark setup. Ignited the fuel/air mix when scavenging on the exhaust stroke. I paid the price of being cheap and not going to 8 coils or CDI8.
The rebuild is just about dead-in-the-water with the new NSW regulations. Now has to be factory to pass a blue-slip.

[20B]

Yes running wasted spark with that much fuel vapor blowing around the intake manifold might have not been a good mix, so to speak.
I vote you put a xr6 motor with some healthy boost to replace it

[Holmz]

The whole system was from one of the old fujitsu series supercars, heads right through to the trumpets.
...

I have only heard the stories of woe with hi injection. Usually with tales of airbox fires.
The hi/lo setups never seem to have this issue.

If it was lit up on the scavenge then the non wasted-spark would help, but once you get flame on the inlet side then those injectors are always squirting away. I am not sure if the flames get sucked into the engine with throttle opening, but how one knows without watching the paint bubble on the bonnet is beyond me... Maybe the AIT goes high?

It was a nice looking setup, I am sure you are gutted.

[Blu302]

It poped and farted a fair bit, even when idling. I never "saw" flames but it burnt a hole in No3 cyl filter cover. Always seemed to be the same cylinder popping, got worse with any advance below 25Deg BTDC.

With the paint bubbling, it started smoking out from under the bonnet noticeably beforehand. It was the first time I had left the fire extinguisher in the garage as well.

This time I'll build and test the engine properly BEFORE installing it. Will need to find a "registered" donor body first though.