RV8 Thor Inlets

[chassis 33]

Right folks, I'd appriciate it if you would humour me for a short while, I'm in play and tinker mode!

I'm looking to build a high torque 4litre RV8, and with this in mind have bought a Thor/Motronic setup from a 2002 Disco, primarily for the extended intakes to give better torque.

The setup came with loom/ECU's/AFM coil packs etc etc etc. basically everything you need to bolt it to a 2002 vintage RV8. Is possible to retrofit this to an 1995 serpentine engine or is it not worth the hassle of trying to sort flywheel position/knock/cam position sensors. I believe this set up uses wide bands Lambda sensors, is that right?

Another option is if I use the Thor manifold for the extented intect tracts and a hotwire setup. Or should i buy a 2002 block and heads as the Disco II engine gives a claimed 188bhp and 250lb/ft of torque, as im only after around 180bhp this seems like a good protential engine.

Thoughts and comments would be appriciated
Regards
Iain

[eliot]

I would think that its a fair amount of work to fit the newer ecu, because, as you point out you need a flywheel trigger - also finding experience or knowledge on that setup may be challenging.

Grafting your existing AFM should work but may need mapping to get the best out of the manifold. Personally i would megasquirt it, but then i'm biased!

Megasquirt is slowly growing support for wasted spark coil packs (requires a trigger wheel, but your options are more flexible) although its very Alpha at the moment.

One key difference, is the fuel rail on the THOR manifold - it's dead headed. I.e. it doesn't have a conventional FPR and return to tank. It shouldn't be too dificult to modify it back to a returned setup. I modified a Ford ST170 rail back to returned the other week.

[chassis 33]

Thanks, I had clocked that about the lack of fuel return, am i right in thinking it's regulated by the fuel pump in-tank?

Otherwise is it a case of brazing on a return to the fuel rail and sending it via a pressure regulator?

Regards
Iain

[eliot]

chassis 33 said:

Thanks, I had clocked that about the lack of fuel return, am i right in thinking it's regulated by the fuel pump in-tank? Otherwise is it a case of brazing on a return to the fuel rail and sending it via a pressure regulator? Regards Iain

Yep pretty much. Pump either has a regulator at the tank end or its controlled electronically i believe.

I was lucky with this one, there was a flange where some sensor bolted on, I welded a little boss on that goes to the FPR.
The thor rail has plenty of flat surfaces, although you may need to Y together either side into a single return.



>> Edited by eliot on Saturday 24th September 09:46