Perfectly reasonable question though. If you’re going to make statements that it has to be the same engine in the road car as the race car for GT4, how do you explain the fact that the Lotus Evora GT4 race car had an engine that never went into a production Lotus Evora road car? Or is it just that you’re making it up and you therefore can’t answer it?

Surely, it simply demonstrates that it CAN be a different engine in the GT4 race car to the road car it’s based on.

Understood, English is hard for me sometimes...

the troll is back

1. Counterpart used: Lotus do not, and never have, built an Evora road car with a 4.0 normally aspirated engine.
2. Sanctioning body in which it was run: SRO GT4 European Series (amongst others) - see link below.
http://www.lotus-verhiest.com/new-ca...cars/evora-gt4
As I say, the road car CAN have a different engine to the race car under GT4. So, in theory, the Cayman 718 GT4 Club Sport (race car) could have a different engine to the 718 GT4 road car.

where did the 4.0L block come from?

Lotus took the head and the block from the 3.5 litre (supercharged) V6 in the Evora S (road car), ditched the supercharger and added new crankshaft, new rods, new pistons, new camshafts, new valves and springs, all governed by a new Cosworth SQ6 ECU. The result was a 4.0 litre, 355bhp at 6500rpm, 328lb ft at 5500rpm engine that did not appear in one of their Evora road cars nor any of their other road cars.

exactly. They used the same block and head from the toyota 3.5L engine in the street car.

Being a 25 car minimum, one car a month minimum, small manufacture they are able to do tweaking with possible waivers in place for BoP.

Look at the GT4 mustang and GT4 camaro.
Not a plug and play engine with street car but based on them none the less.

The Porsche GT4 is basically a direct swap with the street car becuase it is already engineered to a high standard fit for motorsport duty. (Got to love porsche!) It also keeps price point reasonable.

Porsche wouldnt need to make the engine any different then the streer car because the BoP is already on their *** for low weight.

Porsche could build the GT4 engine into a bigger monster then the street engine using the same block. But it is not neccessary.

The key point in this topic here is using the same block in regards to the Lots Of Trouble Usually Serious Evora GT4.

in theroy, porsche could give the new street car 400hp and the race car 420hp. But alas, it would be same engine block.
Not sure how that would work out for marketing given the sandbagging as well as explaining to BoP the added Bump in HP.

So the GT4 homologation rules are as specific as saying it has to be the same head and block in the GT4 race car as in the road car?! But they go on to say it’s okay if pretty much the rest of the engine (including whether it’s forced induction or naturally aspirated and it’s capacity) is different?!
With the forthcoming 718 GT4 and whether the engine is the same in the race car as in the road car, you are confusing “likely to be the same” with “has to be the same”. There is nothing in the SRO GT4 regs that says the homologated race car has to have the same engine as the production road car on which it is based.

Read the Definitions in the very same regulations you quote. Article 1.2 of the Definitions states:
“1.2 Original
As fitted to the SRO Motorsports Group-approved series-produced car and in compliance with their Technical Form.”

It doesn’t say “I’ll make up what ‘original’ means and deem it to mean ‘the same as in the road car’ because that’s what I think it means”!

Always read the Definitions in a set of regulations before launching into the rest of the regulations - that’s why they’re always set out at the beginning!

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