Bigblock SIDI?....

[Gareth]

Hi all,

Has anyone out there looked into the feasability of using a 3.6 alloytec with a 3.0 sidi top end?

Im sure the pistons are different in the shape of the crown, so that could pose a problem.

Not even sure if bolt patterns for heads are close, any body played around with these yet?

Love to hear your thoughts, cheers.

[vlad01]

here you go.

http://holmart.com.au/online/prod1080.htm

[Holden202T]

what is the purpose of doing that ? other than maybe it might increase the compression if the heads are different I can't see any other benefit ? wouldn't it just be easier to get a 3.6ltr sidi motor ?

[Gareth]

Thanks for that, wasn't aware that they came in a 3.6, 210 kw standard!!!! - i think we will see more conversions soon...

Ok, anyone know the idea behind the horrible looking single exhaust port per head?

[vlad01]

Thanks for that, wasn't aware that they came in a 3.6, 210 kw standard!!!! - i think we will see more conversions soon...

Ok, anyone know the idea behind the horrible looking single exhaust port per head?

210kw is very detuned for aussie market, stock they can make around 340-350hp with good tune. This is the LFX engine. aka SIDI with integrated exhaust manifolds, lightened internals blah blah.

Good little article on it here.

http://gmauthority.com/blog/gm/gm-engines/lfx/

The most impressive thing I found was the weight, only 157Kg complete engine with accessories.

[Gareth]

Wow, this looks like an even better proposition than i thought, need to keep my eyes open for a buggered one to play with, intergrated exhaust manifolds sound crap... But must work

[Gareth]

Looks too easy to mount turbos to, just a short adaptor from head to turbo!

[vlad01]

yep, but do you need turbos?

last i heard the older non SIDI can be pushed to 500hp NA with over 9000rpm.

I bet the SIDI can do better.

[Circlotron]

I remember so well, back in the day, they were saying exhaust emission controls would mean the end of high performance engines. Looks like exactly the opposite happened.

[Gareth]

Yeah, and with fuel economy!