Carb for 2.25 SIII

[BigJon]

What do the brains trust think is a good carb for a 2.25 SIII?
We have one here at the moment fitted with a Weber, for which parts are no longer available.

Any suggestions?

Cheers.

[isuzurover]

Which Webber? The single barrel one?

The 2.5P engines came with a 32/34 DTML Webber - which works quite well. You need the inlet manifold that goes with it.

The Zenith 36IV is not too bad (if you do the "fix") and can be bought new for $200ish.

And a Stromberg CD from a 2.6l 6cyl engine works well too, but you need to make a custom adaptor that mounts it at a 30-45degree angle.

[Blknight.aus]

zenith 36IV...

[Bigbjorn]

A 1 3/4" SU with jet and needle as per Austin 1800 spec. is very good. You need to fabricate an adaptor which is not too difficult.

[mark2]

A single barrel downdraft stromberg from an early Holden 6 will bolt straight on, even the linkages fit up. However, you MUST fit an adjustable main jet (about $20 from most parts places). You can get these carbs from most wreckers for about $10 and rebuild kits from anywhere.
I tried Solexs, Zeniths, and the single barrel Weber as well as the holden carb. The holden carb produced by far the most power and was reliable and cheap. Its a bit taller than the rest and the elbow for the air cleaner ducting may need some massaging on top to clear the bonnet which is easily done or just use a small holden air cleaner. With a set of extractors and this carb, I could easily sit on 110.
The single barrel Weber ran very smoothlyh but with greatly reduced power. It may not have been jetted correctly however, but it was the version produced specifically for the 2.25. I really wanted it to work but in the end gave up on it and gave it away.

I have also heard good things about the Stromberg CD from the sixes or V8 as mentioned previously but they are not a bolt on as Ben said.

[Michael2]

zenith 36IV...

I agree, Zenith 36IV has been very reliable.

I've got a Weber 32/36 at the moment, which has been good so far, I did it for a power gain, but a cam grind gives a bigger power gain, after that the change in Carby was negligible.

[Blknight.aus]

webbers and hollies can provide more power or more economy depending on how you tune them but ive had problems with them offroad...

[JDNSW]

Holden carb works well on road, but doesn't stand steep slopes - OK for short slopes but will die on long steep slopes up or down.

John

[Mick-Kelly]

Can someone give me some more info on the holden carb. It sounds interesting. A decent cruising speed would be a good thing.

[BigJon]

I think it will end up with a Holden carb. I will let you know how it goes.

[FenianEel]

zenith 36IV...

Where do you source these?

I haven't been able to get one anywhere. Tried parts joints, wreckers, LR specialists etc

[Xtreme]

zenith 36IV...

I agree - provided you ensure that where the top cover meets the main body there is no warping, allowing air to be sucked in near the throat and the motor to run rich when negotiating an ascent.
I used to test/check with feeler gauge and if any gap was present, I'd strip down, file flat and finish with wet & dry paper on a sheet of glass. Then reassemble - didn't even need to replace the gasket - motor ran as sweet as a bird, and returned around 20MPG.

[Michael2]

In my experience, the Zenith is MUCH better than the Holden carby.

As for where to get them, I may have one or two in the shed. I was going to keep one for the SIII on it's manifold, incase, when I sell it, the buyer doesn't like the Weber. There may be a 2nd unit in the shed, I'm not sure.

I bought a good Zenith 36IV from Fred Smith Automotive (03) 9720 4999 some years ago. He may still have some.

PM me if you decide to go with a Zenith & can't get one anywhere.

[isuzurover]

[COLOR=Navy][B]In my experience, the Zenith is MUCH better than the Holden carby.

Same in my experience. I bought one (NEW) from FWD in brisbane - was about 8 years ago though, price was under $200.

The IIA shorty I built for dad has a 32/34DMTL webber I mentioned earlier (from a 2.5P). It is also a good carby - but surprisingly, I raced dad (snail racing ;) ) a few times for fun, and my heavy x-mil 109" with a rebuilt engine was as fast or faster than his light 88" - despite his twin-barrel carby!

[MarknDeb]

As for where to get them

http://www.fwd.com.au/index.php


CARBURETTOR ZENITH

PL113 Zenith Carburettors Reconditioned on a change
over basis. We require old carburettor back. A
deposit of $185.00 will be charged until we
receive the old unit back . . . . . . . . . . . . . . . . . . . .$203.50ea.