73 'rona Posted July 16, 2007 Share Posted July 16, 2007 So I've plumbed an sc14 super-charger into the factory 6r engine in my corona. Worked out the bugs and basically ended up with a consistant flow of compressed air blowing all the fuel out of any hole it can find in the carb. Ha oops. People keep talking about 'blow through"carbs, but when I push them further they don't really seem to know what they're on about. Basically what I want to know is can I make the setup run with the original carb or do I "need" a special one? What's the difference between 'Blow Through" and "Draw Through"? Quote Link to comment Share on other sites More sharing options...
Unclejake Posted July 16, 2007 Share Posted July 16, 2007 Draw through = the carb is not pressurised. Blow through = exactly what is happening to you. Quote Link to comment Share on other sites More sharing options...
dirty_leppa Posted July 16, 2007 Share Posted July 16, 2007 mite pay to have a talk to a old skool V8 man. they would have a pretty good idea as to what to do as they have been doing this for years. or just muck around and see if something works. maybe try using a good silicon joiner and hose clamps where the charger pipe connects to the carb Quote Link to comment Share on other sites More sharing options...
Unclejake Posted July 16, 2007 Share Posted July 16, 2007 I have mainly seen blow through on SU carbs. Old V8 Fords etc. could be had with blow through using Paxton Superchargers and Ford brand Holley 94s. One other option is to lower your compressor speed by changing pulleys until the carb can manager it. Lowering the float bowl setting MIGHT help too. I know nothing about what you are trying to achieve - I am just guessing. Quote Link to comment Share on other sites More sharing options...
Ogre Posted July 16, 2007 Share Posted July 16, 2007 alot og guys on http://www.sigma-galant.com have blow through turbo setups. and yeah they all seem to use SUs Quote Link to comment Share on other sites More sharing options...
73 'rona Posted July 16, 2007 Author Share Posted July 16, 2007 Unclejake Posted: Mon Jul 16, 2007 6:53 pm Post subject: -------------------------------------------------------------------------------- I have mainly seen blow through on SU carbs. Old V8 Fords etc. could be had with blow through using Paxton Superchargers and Ford brand Holley 94s. One other option is to lower your compressor speed by changing pulleys until the carb can manager it. Lowering the float bowl setting MIGHT help too. I know nothing about what you are trying to achieve - I am just guessing. I think i'm in over my head here... What is the SU carb? ( please excuse my ignorance!) I'm running about 6PSI into it. and I'm basically just trying to see if I can get a little more power out of the old girl... I've got the charger plumbed straight into the top of the carb ( no intercooler at this stage) and I've just pulled it to bit's and tried to seal up any obvious leaks... I really have very little knowledge of carbs in general but i'm guessing that making this actually work is going to be alot harder than just sealing all the gaps and hoping for the best? Quote Link to comment Share on other sites More sharing options...
sholdowa Posted July 16, 2007 Share Posted July 16, 2007 alot og guys on http://www.sigma-galant.com have blow through turbo setups.and yeah they all seem to use SUs The Esprit Turbos use special sidedraughts - dellortos I expect as they preferred them to Weber - which are sealed to allow them to be pressurised. Quote Link to comment Share on other sites More sharing options...
Gaz Posted July 16, 2007 Share Posted July 16, 2007 Unclejake Posted: Mon Jul 16, 2007 6:53 pm Post subject: -------------------------------------------------------------------------------- I have mainly seen blow through on SU carbs. Old V8 Fords etc. could be had with blow through using Paxton Superchargers and Ford brand Holley 94s. One other option is to lower your compressor speed by changing pulleys until the carb can manager it. Lowering the float bowl setting MIGHT help too. I know nothing about what you are trying to achieve - I am just guessing. I think i'm in over my head here... What is the SU carb? ( please excuse my ignorance!) SU is a brand of carb. People also use Stromberg carbs dont they? Guess its cause of the diaprames which presurises it.. fuck knows.. Triumphs had them along with many other brit cars. Quote Link to comment Share on other sites More sharing options...
Burntrubber Posted July 16, 2007 Share Posted July 16, 2007 Webers are good I used a DGAV downdraft carb with no major mods only leaked a little around shafts. Quote Link to comment Share on other sites More sharing options...
WDE_BDY Posted July 16, 2007 Share Posted July 16, 2007 DELETED Quote Link to comment Share on other sites More sharing options...
Burntrubber Posted July 16, 2007 Share Posted July 16, 2007 Nah its brass floats you don't want plastic ones are all good. Quote Link to comment Share on other sites More sharing options...
Gaz Posted July 16, 2007 Share Posted July 16, 2007 Ah also.. have seen on here many years ago someone posted about a kit for one of the webbers to make it suitable for boost. Dunno how crediable it was and cant member anything else apart from seeing it. Sorry for the bum help Quote Link to comment Share on other sites More sharing options...
Ke36 Posted July 16, 2007 Share Posted July 16, 2007 Generally Toyota carbs won't take boost, look for a carb from a factory setup like Charade but you might need two due to the size. The other option is using a carb inside a sealed box so the inside and outside of the carb see the same pressure, seen it used with Holleys on V8's etc. Make sure your fuel pressure is high enough and no plastic floats as they can collapse.Callum what he said ^^ someone in town maybe able to mod the factory carb to be airtight and work (i.e not leak) ,but easiest option ive seen people do is the box have seen this done on a toyota engine will post pics when i can there on my comp at home not sure what you fill the floats with cos ud have to amke sure it would sit the same as with air in them with suck through, dunno how well that would work with supercharge on it only ever seen turbos?assume its the same dealio though plus su carb suck through setups are crap mate had a turbo 4k with one and it was Quote Link to comment Share on other sites More sharing options...
Ogre Posted July 16, 2007 Share Posted July 16, 2007 most of the older mitsis where blowthrough carb, hence why i put that post up, the guys in ozz are against injection for some reason.Dont know what mitsi used for the carbs, just normal solex ones rejetted to suit i think Quote Link to comment Share on other sites More sharing options...
fuel Posted July 16, 2007 Share Posted July 16, 2007 No, alot of the turbo carb Mitsis were SUCK through. Take the MK1 Mirage Turbo and the early Cordia 1.6 GSR Turbos for example - they had the turbo between the manifold and the carb (which was an AISAN carb). The exhaust was routed from the exhaust manifold around over the gearbox up to the turbo on the inlet manifold. Made for an interesting setup which caused turbos to have a short life. Have a look at this, off a early 4G32 Cordia GSR Turbo - http://www.trademe.co.nz/Browse/Listing ... =108046137 I think it was only the Sigma GSR Turbo (in Australia, where they primarily used Solex carbs instead of AISAN like Japan and NZ) which was blow through carb turbo. Quote Link to comment Share on other sites More sharing options...
Rusted Posted July 16, 2007 Share Posted July 16, 2007 SU- Skinners union. The idea for the SU carb came from a meat grinder. Quote Link to comment Share on other sites More sharing options...
CUL8R Posted July 16, 2007 Share Posted July 16, 2007 http://www.vord.net/mgparts/albums/engi ... .sized.jpg SU carb Zeniths and Strombergs are also the same style, they are a "slide" type carby , at least I think thats the name for them. Commonly found on British cars 60's to late 70's, triumphs, Mini's, Vauxhalls etc etc. Cheers,Chris Quote Link to comment Share on other sites More sharing options...
Yowzer Posted July 16, 2007 Share Posted July 16, 2007 I think everyone already covered what I was gonna say, but yeh I think the sealed box around the carb is the cheapest option, however ya will still need to make sure fuel pressure is higher than boost. There are carbs that are designed for boost, or atleast modified for it floating around, and they probably dont cost too much 2nd hand if ya know where to look. Quote Link to comment Share on other sites More sharing options...
cubastreet Posted July 16, 2007 Share Posted July 16, 2007 SUs are cheap too, ahve a look out on tardme. Larger ones were found in pairs on jags and the rover v8. A lot of people like them cos they're easier to tune than webers. Just one tapered needle to change rather than pairs of jets and correctors. Quote Link to comment Share on other sites More sharing options...
Mr Revhead Posted July 16, 2007 Share Posted July 16, 2007 id look for a carb off say a mitsi cordia etc as mentioned its a sealing issue. throttle shaft needs to be sealed. with a K series carb thats all you need to do, not sure on others Quote Link to comment Share on other sites More sharing options...
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