Weber...? SU..? Injection...?

[HedgeBoar]

My standard carburettor on my samurai has given up... wont idle, and the throttle pump is stuffed so I have to pour petrol down the snorkel to get it started! So, it's time for something a bit better, hopefully both in terms of performance and reliability...

So I'm looking at three options, weber, SU, and injection. Plenty of info out there on webers, I hear they run OK on angles if you modify the float chamber venting but nothing spectactular....

Sounds like SU carbs are much better at running on angles, but can't find much info on performance... and there seem to be adapters available in the UK but nowhere closer...? Anyone had any experience with these?

My preferred option would be to inject it, if I can find the gear in a reasonable time frame for a decent price. I'd much rather fiddle with a nice simple injection system than muck around with carbs that never seem to last a good trip without needing adjustment... I assume the manifold off a 1600mpfi wont fit the 1300? In which case, I presume I'd be after a spfi set up -- how common are these?

Any ideas/past experiences would be appreciated. I realise a 1600 conversion would probably be easier, but I like the 1300 (especially at 7000rpm!), it had a rebuild not so long ago, and I'm not after a whole lot more power (I have 6.5:1 gears for off road, and it does 100km/h fine on the road).

[UBZ]

looked into this myself a little while ago.

Briefly, Webers , some swear by them, some hate them , but every one seems to agree that they take alot of effort to get running right.

SU Carb (side draft) basically a motorbike carb, run alot better on angles than stock , but require manifold mods and alot of setup to get right.

Injection , the way to go .apart from having more electrics. From what i have read you can bolt a Vitara 8v EPI manifold and injection setup straight onto the G13a . or look for one of the rare late model samurai's that came while injection on the 13a from factory.

Also looked at LPG , but benefits were out weighted by cost / hassle.

[HedgeBoar]

Yes I too looked at LPG, would be my first choice if it weren't for the cost and the fact that I'd loose the space where my spare wheel sits! Sooo, the hunt begins for a blown up 8v EPI....

[Rotazuk]

Go the 8v epi . If in the future you lunch the 1300 , easy to swap in the 1600 then

Chris

[HedgeBoar]

would this fit? says it's off a baleno....

http://www.trademe.co.nz/Trade-Me-Motor ... 767921.htm

[HedgeBoar]

Oh hang on, that looks like it's mpfi..... what about this? What enigne did the mk1 swift have?

http://www.trademe.co.nz/Trade-Me-Motor ... 306561.htm

[UBZ]

Oh hang on, that looks like it's mpfi..... what about this? What enigne did the mk1 swift have?

Mk1 swift had 2 engines , 8v SOHC G13a and 16v DOHC G13b GTi
East west config, Didn't think the 8v came with injection though.

manifold on trade me is for the G13b GTi ,It won't bolt up to the G13a

[sj408]

Had the same problem with mine went with the SU as injection not available for F8-10 engines.
As for availablity of the manifold conversion make your own.
This conversion can be rapped up in an arfternoon for about & $100-150 depending on how much the carb costs you & how much you have to bribe a mate to glue some steel together.
Tunnning these carbs is piss easy & they tend to stay tuned.

Benifits to a carb setup :

Nothing to change apart from carb.
NO extra pesky electics to get wet or fail while out havin fun.

Benifits to injection :

Keeps running on ALL angles
Gotta love the sound of any engine sittin on the Revlimiter

Just my 2c
Darryl

[HedgeBoar]

Hmm the SU carb option does look like it'll be much easier to source parts for in the short term -- I really want to get the thing going soon so I don't miss another winter!

I could certainly weld up an adapter without much trouble...

What size SU carb did you use sj408? Presumably my 1300 would need a slightly larger one....

[sj408]

Correct there Hedgeboar.
I used 1100 carb soldered the jet up and redrilled it 1 size down, Then thined the needle to match , Took a couple of times to get it near right but works good now. not many places I can't get that the 413 go .
You would want one off of a 1300.
Talk to the boys at swift or one of the wreckers that still deals in the older stuff.
If you need a hand just holla

[Cleary]

If you want to go SU then go talk to an older mechanic or Austin/ Mini specialist. I had a SJ413 engined rally truck with (I think) a 1&1/4 inch SU. Ran at all angles - plenty of power and easy to tune. Only negative is that the SU works on a venturi system - so it needs revs to create vaccuum to get more revs. This means that they need to wind up (progressively). This is in contrast to an EFI - where you can just stand on the gas and the computer sorts it out for you and you can get up to the rev limiter quicker (which zuk's love).

Webbers are good, but again you need to talk to someone who knows them. I have heard that they are very fussy about fuel pressure (and need it regulated down quite a low - I think).

Personally, I would go with an 8V G16A head, but you will also need a computer and wiring. It's not that complicated, but it helps to have a wiring diagram...

[HedgeBoar]

OK cheers guys, I'll see what I can dredge up in the way of parts and let you know how I get on.

[Heath]

I'd go 8V 1600 head too. Better torque (bigger valves) than std, get a TBI (single injector where carb would be), computer and fuel pump (VL comodore will do). Easy to wire up (about 4 wires from memory), even easier if you get the loom as well. Or spring for the whole multi point system and loom, but be warned the 8v head (16v head wont fit 1300 engine) and the mpi system manifolds are different so will need some bodging.

8V is easier and keeps it all pure zuk too (except for the pump )

Or look for a mitsi carb. Can't remember the model but aparently they were damn near interchangeable. Do a search online - google is your friend here - as its been done by zillions of zuk owners wanting more power.