Which 6 cylinder engine for a Race car?

**david_white** · 28-04-2011, 13:25

Surely a 302 as in an XR8 (mk1 sierra) would be homoligated around the same time as an XR4i? BMW engine would still be a better more modern choice though I guess.

**Roadsport** · 28-04-2011, 13:53

Originally Posted by david_white

Surely a 302 as in an XR8 (mk1 sierra) would be homoligated around the same time as an XR4i? BMW engine would still be a better more modern choice though I guess.

I reckon It doeas not have an internationa homologation but only homologated in South Africa or something odd like that.

**Roadsport** · 28-04-2011, 14:25

http://users.tkk.fi/kimmo/xr8.html

**Sonus** · 28-04-2011, 14:50

Alfa V6 with itbs

**Roadsport** · 28-04-2011, 16:18

I'd love an XR8 though. Even as a road going car. Too bad you can't build a replica and get it MOT'd here.
Could only enjoy one on track days.

**Daniel83** · 04-05-2011, 11:05

Hey! Just came back from the US and had a new Camaro V6 as rental car. That car really impressed me, especially the new LLT 3,6l V6 engine, I LOVE it. Great power, lovely sound and still good mileage. This is what Wiki tells about it:

The 3.6 litre (3564 cc) LLT is a direct injected version based on the earlier LY7 engine. It was first unveiled in May 2006, and the DI version was claimed to have 15 percent greater power, 8 percent greater torque, and 3 percent better fuel economy than its port-injected counterpart. The LLT engine has a compression ratio of 11.4:1, and has been certified by the SAE to produce 302 horsepower (225 kW) at 6300 rpm and 272 lb·ft (369 N·m) of torque at 5200 rpm on regular unleaded (87 octane) gasoline. This engine debuted on the 2008 Cadillac STS and CTS.[9][10] GM will use a LLT in all 2009 Lambda-derived crossover SUVs to allow class-leading fuel economy in light of the new Corporate Average Fuel Economy (CAFE) standards. In the Lambdas, LLT engine produces 288 horsepower (215 kW) and 270 lb·ft (366 N·m) of torque.[11][12][13]

And a little vid of its lovely V6 sound:

Latest version producing 312 hp (233 kW) @ 6400 rpm and 278 lb·ft (377 N·m) @ 5200 rpm on 87 octane fuel. Sure it would get close or even above 100 hp/l on > 95 octane fuel and proper setup.
Maybe a bit too high tech for your application, but if I was looking around for a new V6 this one would be my engine of choice.

**smiley_666** · 04-05-2011, 12:22

looks to be the same engine as in the SIDI Holden Commodore here in aus. Should be easyer to get one from here than the states

**Daniel83** · 04-05-2011, 13:19

It most likely is, it's part of the GM High Feature Engine (HFV6) family found in a variety of cars from GM, Holden, Opel, Saab, Alfa Romeo, Saturn, Cadillac, Buick, Chevy etc.
The LLT is a bit difficult to find around here indeed but I guess it doesn't make a big difference if the engine comes from the US or from Australia as long as you live in Finland...