Mono 2000 Engine Specification

[TheCAB]

Hi,

Bit of information required please. In the Mono2000 class as I understand you have to run "standard" road going engines, which are not meant to be "an engine made up from a collection of standard parts".

In re-building an engine to run in Mono what are you "allowed" to do to the engine. Can you replace pistons, polish internals, balance reciprocating parts or is that all a no no. Headwork are you allowed to do anything, reduce seat widths, polish ports, etc?

Cheers

[andrewc]

Valves diameters, crankshafts, camshafts, cams, pistons, rods, combustion chamber volumes, timing, porting all has to stay as per road car.

You can dry sump the engine, fit smaller racing flywheel, do what is required to remove ancilliary devices that road cars have but racing engines don't need, fit your own exhaust, and fit individual throttle bodies. Injector size free. Mapped to suit.

So most people take the fitting kit from an F3 engine and fit them to the road car engine that the F3 engine was developed from, and different throttle bodies / exhaust as those are optimised for restricted engines.

http://www.monoposto.co.uk/wp-conten...-Version-1.pdf

5.7.1 (a) Modifications Permitted:
i Fuel injection systems including ECU, to the specification for Formula Vauxhall/Opel (up to
1999), Formula Renault Sport (up to 1999), or Formula 2000, is deemed to comply. Original specification fuel injection may be replaced by carburettors. Throttle body fuel injection may be used. Restrictor plates, with specified apertures to effectively reduce performance, may be required following notice.
ii Dry sump lubrication system permitted, together with modifications to engine castings necessarily required to enable fitment.
iii Standard flywheel may be replaced. Flywheel is free.
iv Ignition system is free.
v Big end bolts free.
vi Valve guide material: free
2014 St Cross Electronics Mono Championship PUBLISHED COPY Version 1 Page 9 of 18
vii Valve spring retaining cap material: any ferrous metal
viii A re-bore allowance in accordance with manufacturers specification up to 0.5mm; together with
manufacturers specification replacement pistons. No additional machining to recover original
compression ration is required or permitted as a result of this modification only.
ix Cylinder head gasket plane may be machined in order to recover a warped head. Original
specification compression ratio must be recovered by local machining to the combustion chamber in the head. All such work must be reported to the Eligibility Scrutineer who may specify a combustion chamber volume and request to examine the head before use.
x Where fuel injection is used, ECU and wiring loom are free.
xi For Ford Zetec engines valve timing is free: camshaft and crankshaft valve timing pulleys must remain standard.

[TheCAB]

Andrew, thanks for the reply.

Can you "blueprint" the engine to maximise factory specs or is the principle supposed to be that the engine is more like "straight out of a road car".



Cheers,

[andrewc]

As many engines are used in different cars in different specs, you can't cherry pick the best bits of different engines to built a supposed best-spec option which was never actually made - i.e. the head from an an Escort, the cams from an Orion, the block from a Sierra and the rods from something else.

Do modern manufacturing processes which are a lot tighter than days of old, permit too much blueprinting in the traditional sense? A lot of effort for a tiny gain?

The spirit behind the regulations is to provide a reliable engine that isn't highly stressed, that has a long service life and is easy to get bits for and for the average Joe to maintain.

I suspect there are bigger gains from throttle bodies, mapping and manifolds than engine internals.

[TheCAB]

Andrew,

Cheers again for the response, no issues with your logic there.

Sorry for more questions, in relation to throttle bodies I see that individual bodies are restricted to 40mm diameter.

Do they therefore need to be a 40mm parallel body, or is the 40mm the restriction for the inlet manifold side of the body i.e. could be a a tapered body say 42mm- 40mm, is the 40mm the butterfly size restriction.

Cheers,
Colin

[andrewc]

There was a 40mm restrictor but that clause was removed either for the start of this season or the start of last season.

Lap records set with 38mm throttle bodies still stand today.