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rebuilt 202 with varajet 2 not running properly

Started by _seanperrett_ , Apr 19 2014 04:23 PM

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33 replies to this topic

#1 _seanperrett_

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Posted 19 April 2014 - 04:23 PM

Hi there guys,

just finishing off my lj torana sedan and just went to run up my newly rebuilt 202, and its not running well. It has a varajet 2 carb on it. it came off another 202 but when I turn over my new motor it revs up to about 2000rpm then runs for about 10-20 seconds then dies. Am I wasting my time with the varajet? should I just bin it and put a new 350 holley on it. I was sceptical about putting on a secondhand carb and now I am kicking myself. Is there anything I should try before I go buy a new carb?

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#2 N/A-PWR

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Posted 19 April 2014 - 04:34 PM

the two Varajets I had could never run right,

They even drank fuel like two Motors running, even Mechanic's won't tune them - they may have been great when they were new, but not now.

So now with a Holley again, idles, more fuel efficient, and smooth running. Dave I

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#3 _Bomber Watson_

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Posted 19 April 2014 - 04:36 PM

Just make sure you cut the carb flange off and spin it 90 so the throttles face the right way, No Holley manifold has this right.

If your using the stock varijet manifold then even better.

Cheers.

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#4 N/A-PWR

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Posted 19 April 2014 - 04:38 PM

Hi DJ,

I got the stock Varajet Manifold with the Holley adapter plate. Dave I

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#5 _seanperrett_

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Posted 19 April 2014 - 04:46 PM

well that looks like that's settled. now next question, the motor was rebuilt and bored out 60 thou with fairly flat top pistons, mild street cam, block decked, 12 port head, port matched etc etc. should be a nice motor once running nicely. what carb would best suit this motor? holley 350? or something a little bigger?

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#6 _Bomber Watson_

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Posted 19 April 2014 - 04:50 PM

....Fairly flat top pistons, mild street cam? Cummon mate some details would be nice not piss drivel.

Cheers.

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#7 N/A-PWR

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Posted 19 April 2014 - 04:52 PM

a brand New 500 2bbl Holley,

one power band all the way 3100rpm to 7500rpm, and idles at 650rpm. Dave I

has to be a 208ci, 30/70 cam and 250psi compression

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#8 warrenm

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Posted 19 April 2014 - 05:39 PM

The Varajet will run on a 202 when the correct mods are done. They tend to run lean when std on a modified engine. I've fitted a few with good success but too hard to tune over the internet. If it was my engine, I'd use a WW Stromberg, Weber from a F##d 6 then last a 350 or 500 Holley depending on engine mods.

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#9 _Lazarus_

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Posted 19 April 2014 - 09:00 PM

Read these - (maybe you should too Dave)

http://www.oldjohnno.id.au/page24.html

http://www.oldjohnno...au/page240.html

There was a guy on here somewhere having troubles with his Varajet and said he got a reco one off ebay and now is running good. There is also a guy on ebay somewhere who sells new or rebuilt Webers and says he will pretune them to your specs. They are around $500 plus adaptor but are considered a very good alternative by many including OJ.

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#10 rodomo

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Posted 19 April 2014 - 09:45 PM

They are fiddly to tune. Sounds like you might not have the hot wire to the choke connected?

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#11 N/A-PWR

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Posted 19 April 2014 - 10:14 PM

I had the Choke wired, made no difference - is the idle circuit

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#12 rodomo

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Posted 19 April 2014 - 10:17 PM

Explain idle circuit please Dave?

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#13 N/A-PWR

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Posted 19 April 2014 - 10:20 PM

Now, well it is that electronic valve sorry being the idle circuit, choke was wide open sorry Rob. Dave I

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#14 UCSLE

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Posted 19 April 2014 - 10:24 PM

sounds like you have blocked the vent tube on the Varajet . Varajets wont run properly with out the vent tube connected , the choke wired up and the anti diesel solenoid wired up .

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#15 N/A-PWR

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Posted 19 April 2014 - 10:32 PM

Gees and Damn Troy, well a Holley is simple for me, and works just fine, the other will cause too much pain

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#16 UCSLE

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Posted 19 April 2014 - 10:48 PM

Just make sure you cut the carb flange off and spin it 90 so the throttles face the right way, No Holley manifold has this right.

If your using the stock varijet manifold then even better.

Cheers.

just get one of these 350 holleys .........if you can find one

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#17 N/A-PWR

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Posted 19 April 2014 - 10:57 PM

he he

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#18 _Bomber Watson_

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Posted 20 April 2014 - 07:27 AM

Yep or that.

I'd lean toward a 500 though.

Cheers.

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#19 _seanperrett_

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Posted 20 April 2014 - 08:43 AM

Thanks for all the quick replies. I have the choke and the solenoid hooked up. Ill be down in the shed today having a bit more of a look. I have done a bit of research via the internet and seems like the holley is the quick easy idiot proof alternative but the weber off a f#@!on is the best for performance and economy. Am I correct in assuming this?

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#20 N/A-PWR

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Posted 20 April 2014 - 10:09 AM

Yes, was a common thing to do Sean:-

Found this too

http://recarb.com.au...62d94077fc64d97

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#21 _Ned Loh_

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Posted 23 April 2014 - 09:26 AM

Any carb in poor condition won't run well. A Varajet 2 in good condition and properly tuned will run as well as anything else (& perhaps even better than some of the options thrown up so far) for your application.

The only plus for the holley is that people seem to know how to tune them, and parts are easily available.

Not really sure why the varajet gets a bad wrap. I guess it's because they are working with something 30 years old and in poor condition, and they seem to be a bit of mystery to many tuning wise. A little bit like the q-jet perhaps.

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#22 N/A-PWR

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Posted 23 April 2014 - 07:38 PM

I got a bit of info on the Varajet, where the idle is when the fuel cut solenoid is on and the secondary butterfly is cracked just open for idle the pamphlet said. Dave I

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#23 _Bomber Watson_

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Posted 23 April 2014 - 07:56 PM

Any carb in poor condition won't run well. A Varajet 2 in good condition and properly tuned will run as well as anything else (& perhaps even better than some of the options thrown up so far) for your application.

The only plus for the holley is that people seem to know how to tune them, and parts are easily available.

Not really sure why the varajet gets a bad wrap. I guess it's because they are working with something 30 years old and in poor condition, and they seem to be a bit of mystery to many tuning wise. A little bit like the q-jet perhaps.

You got it in one, i can tune a Holley, a BXV Stromberg (to an extent), or a SU. But im #@$^%& if i can get my head around a Varajet.

So for that reason, for me personally, the carb spinning mod and a nice 500 2bbl would be the option of choice.

Plus i already have pretty well every Holley tuning part known to man kind.

But hey, everyones different.

Cheers.