253 questions
Hey all just wondering if anyone knows of any topics or anything of a 253 with a decent amount of power. I'm doing up a 253 and wanna see what other kinds are out there. Also does anyone know what kind of carby i'd have to go for forced induction or any places i could get mine rebuilt for it or if any kits are available to do it myself. I've never turbo'd or supercharged a carby before so this is new to me, cheers
The Lion will never Die!
how much power do you want out of it, I'd advise to just source a 308 and spend the $$$ on that
You can make good strong tourqe/power out the 253...basicly its a 308, shorter stroke and 3.8in bore... if you rebuilding there plenty of rebuild kits avalible on the market depending how much you want to spend.. best talk to a good engine builder..
Floor it and swerve driving skool
Yeah i was thinking of going a 308 but i had this engine a while and i'm not looking at overly amounts of power was just curious about forced induction since these things can rev a lil harder. At the moment it has 308 heads and a bigger cam, and a differnt dizzy can't remember what kind though. So thought a turbo would be great
The Lion will never Die!
The 308 and 253 have the same stroke, they only differ in the bore size, the 253 is about a 3.5" or 3.6" and the 308 is a 4" bore.Originally Posted by NZVK308
captain halfajob
god, another case for the search function. this is the most commonly debated topic on the forums isnt it?
anyway, a 308 is cheaper to get a bunch more power, goes straight into the spot the 253 was without any mods, you cant drive eiter on your p's in melbourne so no licence differences, other than for races specific for 253 i dont know why anyone would bother with a 253, there is nothing you can do to a 253 that you cant do to a 308 for a better outcome.
there is a reason that they dropped that V8 for a 6. think about it.
I saw a 253 with twin turbo a while ago on a differnt forum making heaps of power but can't find it now unfortunately. I'm mainly asking if anyone knows about the forced induction carby. I did search for it but i couldn't find any topics about the carby, cheers
Exhaust Guru
I only saw one actual question, not 253....
Jaywa, I'm soon to start a 253 into a VH which will end up with a single turbo on it but I'm going to cheat and make it easy by using injected heads and manifold on it so I don't have to worry about a blow through carby. But you can still do it with a carby, You can either use a sealed box people sell for holleys or modify the carby itself, both options in the end are probably more expensive than just converting it to injected. There's not a lot of power difference between the 253 and 308 if you are willing to set the 253 up as a high reving package, which is something it can do better than the 308.
To convert it to injection you will need, heads, manifold/rail/injectors, ignotion module, a loom, ecu and a dizzy to suit the loom you get and a camshaft (I'm going to use the stock one from my VP). I'm going to cut/flip the nose of a banana manifold to the other side and run the cooler pipes into it from that side. It's a long term slow thing for me but I have most of the parts allready, still collecting some but not many. Can't see any reason why it wont make 300 rwkw
captain halfajob
i have to be honest and say that after i read that 6 times, i realised what you meant and pissed myself laughing.
ok, so on with the next 252 questions pls ;P
haha i was like 'wtf' but i get it now. bunch of funny buggers around here
Haha very funny i meant the engine lol. Yeah i wanna stay with carby just cause i couldn't be arsed to do so much work on a vb. I don't like it that much lol. Sounds like a good idea though green foam
I think the hassle of converting it to injection is nothing compared to getting a carby turbo setup working well
Tells it like it is.
We covered this not so long ago - clean up the heads, brock Group A/bathurst manifold, Quatrajet carb, nice set of extractors and a mild cam. Take the carb and dizzy to a carby expert and get them tuned and re-graphed to suit one another (and the cam).
That setup got me into the low 14's in a Torana around 15 years ago.
Reaper
Tells it like it is.
WTF??? double post.
Reaper
I haven't been on to long on this site so it's all new. Yeah would prob be easier to just drop a 304 in or 308 but i've had the motor for a while. Oh ok sweet thanks for that. Might look into getting that done, cheers
captain halfajob
well, even after i posted up the whole "308's are better, cheaper" blah. i have to admit, i would love to see an efi 253 with a turbo. it really wouldnt be that much work to go efi (i think) cos the whole top end would bolt straight on (right?)
THEN i would say, "hey man, nice 253 ya got there"
I found some really cheap 304 efi stuff so looks like i'll just go efi. At least i have the VP to go off haha. I just gotta find the heads now
Did you get the dizzy and cam and everything?
ari666, it all bolts straight on, the only thing is the combustion chamber hangs over the bore a bit but it doesn't seem to cause any real drama, I might end up smoothing the bore a bit to match it better but I'll cross that road when I cross it
Nah not the dizzy. I got an aftermarket cam in it that should work well though
Banned
308 and 253 have same stroke the diffrence is apart from bore size is rotating assembly wheight get a 308 at the same wheight or less than it will rev just as hard or harder
as for cams you canot run overlap with forced air induction
jakes performance in canberra can help with the carb call them they renound around australia
You can run overlap, just not race car amounts of it
Banned
what is the point if the valves overlap then the psi will flow out the exuast so you will loose psi
You still need a cam with enough duration to make power up high and to do that you are going to end up with some overlap, there's not enough time for much/any boost to get out at high rpm, that all happens in an instant, there's also a huge restriction in the exhaust (being the turbo) with alot of backpressure holding everything in
Banned
the answer is to max lift the intake and shorten the dur of the exuast
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