Mk 2 astra head Help

[F188CHG]

Hi guys i have a ported astra 1.3 head will it be a straight forward swap for the head on my 1.6 cavalier wot head gasket will i need and wot should i expect on the bhp gain 3-5 ish ??? Thanks Guys Alasdair :wink:

[F188CHG]

Any 1 :o

[Riggy]

i would of thought it woul be a loss matey

[F188CHG]

You think cant be much worse than the cavay head its pish :lol:

[Riggy]

ah cavvy head lol didnt see that , is it carb or injection


would have still thought that the valves would be bigger on the 1.6 though

[F188CHG]

Carb

[Stuart]

port shape will be better, and the CR will be increased BUT the 1.6 head has larger valves.... so you will lose there


id say you will not gain/lose anything...

[F188CHG]

Wot dose cr stand for will the bigger valves go in to the 1.3 head??? :?

[Stuart]

cr means compression ratio.

the valves will fit, but you'd need the seats recutting and then they would need blending into the head... looking at about ?200ish to get that all done for naff all gain.

also bear in mind that your square port 1.6 carb inlet manifold wont line up right with the 1.3head.

[F188CHG]

So i worlg need a manifold from a sr :?

[Stuart]

yep

[F188CHG]

I was planning on putting the 1.3 ported head a piper cam & pully do you think its worth my while i have a weber,de cat pipe and a magnex system on the cavay engine at the mo :wink:

[Stuart]

id say get a 1.6 gsi head as opposed to the 1.3 head.

otherwise your simply throwing good money after bad adding the extras onto the 1.3 head on a 1.6 bottom end.

read the tuning guides at the topof the page

[F188CHG]

Ok gsi/gte head it is bud 8)

[Adam]

De cat pipe
De-cat on a carb engine :?

Your 1.6carb inlet wont fit a gte/gsi head either, no standard carb inlet will fit it.
You can get t40s and a round port t40 head to fit.

If you want to fit a gte/gsi head you would probably be best to use gte/gsi injection system, but you would need loom, ecu etc then.

[F188CHG]

Yeap its a 93 nova with a late 92 cavalier engine in it wot about a 1.4 sr head i dont wana go on to injection :?

[Stuart]

in all fairnes if your trying to build a fast engine your wasting your time.

the 1.6 carb engine is something like 82 bhp, compared to the injection version thats 100bhp.

you will have to spend a fair bit to get the 82bhp engine to be somewhere near that of the injection one.

the 1.4 SR head owuld be worse than the 1.3 ported head you mentioned.

[F188CHG]

Just looking to bring the carb up to 100bhp :wink:

[Stuart]

its "possible" to get the 1.6 carb to 100bhp, although a tad pointless as it would be massively cheaper to swap it for a gte.gsi engine lol

id say its gonna cost about ?300ish to make the carb upto 100bhp, whereas the gte/gsi engine will cost about ?100....

[F188CHG]

Nova i know wot your saying bud, but ive just put this engine in and i dont wana change again at the moment think the next change will be when im ready for a 2.0 16v

[Adam]

Just stick with the head you have then, and save money.