Hi all!
Rather than go down the a14/a15 route and having to get the car re-engineered what are some reliable power options I could make to get some more as a daily driver out of my a12 what's a reasonable over bore size thatd still give me some room in the future and any recommended cam mods?

cheers
tom

Go a mild cam with not too much lift.
A set of flat top pistons and 1-2 mm over size bore.
Downdraft weber
Extractors
Oval port head (h89/75)
Lightened flywheel
Have everything balanced to complete it.
It all depends on how much you'd like to spend... At the end of the day the sky's the limit but each of the above mentioned should make for a nice little package. Currently I'm pretty much running that an it's a really nice mild street/ daily package...

http://datsun1200.com/modules/newbb/v ... id=429090#forumpost429090

its probably got 76mm pistons as it had also extractors
and weber 32/36 carb but seller kept those. The history
of the engine is unknown apart from the hot specs.

im currently in the process of doing this too, im match porting my head to manifold, 32/36 downdraft, h75 head, double valve springs, rocker spacers, 73.5mm flat tops, shaved head, lightened flywheel, HD clutch, blanaced and 0.8mm head gasket. hoping for anything between 85-100hp, good streetable engine with a small bit of poke over factory.

P.S.

hey Dion 120y sorry Im not familiar with the concept of rocker spacers what do they do to help performance?

well i was told that if your getting up high rpm it keeps the rockers from shifting side to side. because it replaces the spring between each rocker

or save a heap of cash and make more power and still be 100% drivable and do an a12 turbo

easy and cheap! ,just did a turbo setup on a toyota 4k and it was well worth the 200 dollars spend doing it

just buy a stromberg cd175 carby or a 1'3/4 su carby and then make a j pipe off the stock manifold ,then use a carbon seal equipt turbo or even one without a carbon seal ,then theres oil line and stuff

super easy to to and goes like a shower of #OOPS# ,plus its not hard to srive like a cammed na motor can be and is still reliable is its tuned ok

we found if you use a stromberg off a volvo the jetting is realy close for the 4k and should be just the saem for an a12


cheers

now that sounds like the best idea! bit of decomrpession and away you go!

Spacers are indicated if you are revving over 7,000 RPM.

Go with a mild cam for low RPM usage.

If you want a power increase over the stock cam, which means revving the engine higher, use a GX cam or equivalent (6500 RPM usage).

I recommend the stock cam. It is perfect for reliable power in the 3000-6000 RPM range.


> what's a reasonable over bore size thatd still give me some room in the future

Well since you can go 76 mm in the future, any regular overbore size is fine: 73.5 or 74.0 or 74.5. If the bore are still good, skip overbore and just hone it and new rings. (a +1 mm overbored is good for approximatly 9-tenths horespower (.9) increase).

Valve springs oval port head oval port head/manifolds and ute diff 4.1:1 ratio and you would have a nice little toy that would rev when you wanted it but still return good economy if you stick with the stock cam

if you want a bit more fit the falcon Weber but make sure you spend the time to jet it up right or it will be hard to drive

you should be able to get the head and manifolds for a couple of hundred and the valve springs for hundred more diff probably couple hundred

pretty cheap fun good luck