*INFO* 1.2 8v Tuning Guide

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Originally Posted by turbojolt

i don't think they increase fuel the are meant to increase fuel pressure which changes the fuel spray as it come out of the injector


from what i have heared about them anyway

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no they increase fuel pressure therefore they make the injectors inject more fuel. will do funk all on a carb car

o right well i heared wrong then lol

would a 1.3 carb need to be down jetted to match the 1.2 engine

Dont think so mate, I'd try it without rejetting first. Should be ok iirc

what other mods do you have planned?

List of stuff I'm thinking of doing....to make a kind of stealthy engine.

- Skimming.....both Head and Cam carrier.
This would cost me around 60-80 quid I rekon. Giving higher lift on cam, theoretically, and increasing compression ratio. Need to measure CR first to make sure everything's hunky dorey.

- 1.3 SR camshaft kit.
Cam and followers to be installed.

- GTE/GSI exhaust system, from manifold back. This should give good exhaust flow, much better than standard system. May then try out a Eurorallye exhaust system mated to the front end of the GTE/GSI system.

- Either SR or 32/34 Weber carbs. This will probably be a bit further in the future.

- Eventually might try the 1.3 crank and rods in it, however 1.3 engines are like rocking horse **** so I'm not holding out hopes, unless I can find one which needs rebuilding, so I can nick the relevant parts.

I'm hoping to get close to SR performance. I know it would be much more advisable to XE the thing, but I fancy doing some of this stuff just as an exercise. Plus I think I would be lethal with 150 brake lol

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Originally Posted by Riggy

1300 crank and rods , increase the capacity to a 1.4 lol :thumb:

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i didn't know this, very interesting. would work well with the other goodies i have goin on my 1.2.

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Originally Posted by burgo

no they increase fuel pressure therefore they make the injectors inject more fuel. will do funk all on a carb car

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hence sri inlet

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Originally Posted by MattyW

i didn't know this, very interesting. would work well with the other goodies i have goin on my 1.2.

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just bare in mind that altho yes it does give you a 1.4, it achieves this by having quite a large stroke and therefore a lazy engine. you'd be better off with a normal 1.4 bottom end

is the sr crank and rods the same as in the 1300 mk2 astras


any one thinking of doing the 1.3 crankshaft and con-rods should have a look here clicky there is a set of balanced and polished 1300 sport con-rods for only £60



also before tuning a 1.2 8v engine would it not be a good idear to change all the oil and filters timing belt maybe run a bottle of engine flush through the system maybe flush the cooling system change the dizzy the spark plugs and ht leads just to make sure it was in really good condition before spending money on it