cracked mains bearing cap help?

[Tarmac]

So I got a complete block and head in the boot of the sj I purchased. Now the eng is burning a lot of oil. I thought the bottom end (from the boot) looked gd, bores etc, but have pulled it apart an no 5 main cap has a visual crack that appears to have been welded prev ( diff shade of ally around the crack)

Can you buy new mains bearing caps?? or get 2nd hand in reas con still?? I realise both = a line bore, pulled it apart tonight by torch light from the back of suzy or do I have to weld it up (again)

[zukmeista]

Don't waste money on it, scrap it and put a 1600 in. The 1300 is a dead end.

[Tarmac]

Dunno, I have a soft spot for the little ally mtr now. Took the cap to a reco firm and was told not to weld, but emery tape till it goes then crack testing and hope its a deep scratch. Sounds like sourcing another cap etc is more than its worth - there is a few bucks of ally in a g13 - also why can I find info on SOHC 8v g13s when the one in the car and the head I have are def 2cams 8valves 1 timing gear driving them both? or am I looking at it wrong? Zukmeista did you find some 16x6 rims, If you have some centers you can use how bout steel dx d22 nav rims if you can find them cheap - I cant imagine they are desireable for much else. tall and skinny are the new

[zukmeista]

No, there is only one cam. The 'cams' you think you are looking at are rocker shafts, the cam is in the center at the bottom. I did find some rims, 16x7's, bought them on trademe for $220 yesterday

[BlakeJ]

saw those rims you got that was a sweet deal, dont see them in 16" very often. Im looking for 1 shitty 16" flatdeck rim at the mo for my tractor grips, already have one

[zukmeista]

saw those rims you got that was a sweet deal, dont see them in 16" very often. Im looking for 1 shitty 16" flatdeck rim at the mo for my tractor grips, already have one

I bought two on trademe, wanted one for a spare, the other one is yours if you want it.

[BlakeJ]

how much you reckon to ship to chch

[zukmeista]

Dunno, I haven't got them yet, but when I do I will get a price for you.

[Tarmac]

2cams guess I win penis of the day / shld have known better... Them yanks still seem to get some gd power out of the g13, if I can trick a wrecker outta a 32 36 web then I will pursue this angle, if I can find 1

[northdude]

just get a second hand cap off a dead motor bolt it up with bearings and crank and all caps see if crank turns if it doesnt line bore it if it does take it apart and measure clearences or get some one that knows how to do it do it for you

[zukmeista]

2cams guess I win penis of the day / shld have known better... Them yanks still seem to get some gd power out of the g13, if I can trick a wrecker outta a 32 36 web then I will pursue this angle, if I can find 1

Honestly, it's not worth trying. I have tried getting more power out of the 1300 but all you will do is use heaps more fuel. With a 1600 you can get more power and torque, and potentially use less fuel.

[northdude]

id like to have a look at a head off one of those motors as thats were you get power increases if you do the right things the last small motor i did went real well with a few mods i like the challenge of building small motors especialy when you get told it cant be done

[zukmeista]

id like to have a look at a head off one of those motors as thats were you get power increases if you do the right things the last small motor i did went real well with a few mods i like the challenge of building small motors especialy when you get told it cant be done

No-one said it can't be done, it's just not worth spending the coin on it when you can just bolt another motor in that has more power.

[UBZ]

I would prefer a worked 1300 over the 1600 anyday.
Quad carbs
the 1600's are so sluggish in comparison .
Apart from a slight torque increase , you don't get alot for the weight increase IMO

There are plenty of people working and fitting G13's as small aeroplane engines with impressive results .

[zukmeista]

I would prefer a worked 1300 over the 1600 anyday.
Quad carbs
the 1600's are so sluggish in comparison .
Apart from a slight torque increase , you don't get alot for the weight increase IMO

There are plenty of people working and fitting G13's as small aeroplane engines with impressive results .

Have you driven a 1600? I have an 8-valve and it is so much better than the 1300 it's not funny. And the 16-valves are supposed to be better again.

[northdude]

my 1.6 16valve is a bit of a slug compared to the 1300 i worked

[zukmeista]

Maybe, but don't forget the extra 500kg's the motor is probably having to move being a LWB Vitara.

[UBZ]

Have you driven a 1600? I have an 8-valve and it is so much better than the 1300 it's not funny. And the 16-valves are supposed to be better again.

Yes . they are a more powerful and produce more torque. but they don't rev as freely as the 1300.
And you can feel the weight difference in the front on angles etc .
I always wanted a worked G13a , but have got Hooked on the F-series engines which rev even better agian

[zukmeista]

Mine revs quite happily, the aussies reckon they rev much better with a 1.3 flywheel than a 1.6 cos the 1.6 one is bigger. As for the weight difference, it would be about as much as fitting a winch.

[BlakeJ]

im not here to argue, i respect UBZs shit cos i love his trucks and hes a clever man. I put a 16v g16 in my samurai and i f@$king love it. with extractors, good exhaust and the g13 flywheel it is a completly different truck from when it had the g13, that thing was slow and shit, yea it was an old motor, but the swap is pretty easy other than the wiring. But if you want the challenge of building a mean g13 that would be cool, different strokes for different folks. I did the g16 cos i wanted power cheaply, and it pulls mean, actually does skids on the road now ive sorted the clutch out.

[Tarmac]

"Crack" goes the can of worms If the cap is fkd its going to the scrappys (line bore sounds too much) but if its ok then I think I will pursue it.. The g13s seem gd for a 1.3 8 valve they must be to make their stock power with lowish comp, I feel the most gains will be made from more comp / 9.5 ish, 421 manifold + pipe, a weber n maybe a wee cam in that order. 1600s are good but also a little hard to find for a gd price... even rooted vits are getting expensive

[Tarmac]

If it is rooted then I have a nissan van bellhousing that fits an RB man box I have... and sr20 na rwd engines are only around 750 complete but weigh a lot more

[northdude]

id try another cap if you can get hold of one japanese machining tolerences are pretty good and consistant i cant remember having to line bore a japanese engine that weve swaped a crank in or cap chevs etc are a different story you could try lightening the flywheel pity you werent in auck i could have a look at the head and see if it would be worth doing some port work not familiar with that g motor another thing you could do is radius the inlet manifold where the air fuel mix does a right angle turn after the carb bit hard to describe theres lots of little things that you do and when combined make a noticeable difference

[northdude]

so what did you end up doing with your engine