Outer Limits 4x4 Board

Hey all just wondering what carbys people are using for a blow thru carby turbo setup?? will the stock one work without callapsing the float. i really want to keep the stock carby. any help would be great. also pics of this setup would be good to see to thanks

Sierra?

yer mate sierra

Do you have any experience with setting up blow through carbies on other engines? Why do you want to keep the stock carby? Most people can't get them to work properly atmo let alone with boost running through them.

Personally I think trying to set up a blowthrough carby on a 4wd is a waste of time, especially on a Sierra with so many cheap ways of running efi. I reckon by the time you backed the boost down low enough to make the carby run properly you would gave more power more reliably with a 1.6 efi conversion atmo.

Just my 2c. I have no experience with turbo conversions on g series motors, but from what I have seen they generally have a short, expensive life.

Steve

I've seen to0 many unsucessfully blow throughs ( admittedly years ago ) to have any interest in them. The best i saw was a Webber made for blow through operation but IIRC was using low boost.

Even draw through can be challenging, carbies have an operation range largley governed by their throat diameter.... pick one small enough to run well on a small engine at low output and its not going to like big airflows when on boost and vice versa. EFI isn't perfect either but you can run staged injectors etc etc if it turns into a major truma.

For all the pain, and given the ready availability of EFI systems, i'd suggest that's the way to go.

There are many great blow through carbies available these days especially coming out of america, problem is they are just about all for V8's and much to big for a zook motor lol. That said you could maybe go the Vortech carby enclosure route, but I assume you'd have to custom make your own to fit.

Which pretty much says it all....... in the days of cheap effective efi systems why anyone would actually make let alone use a carby escapes me.

Perhaps is a historical counter-reaction... in the days of carbies people drooled over injection and it was the primative mechanical stuff.... now with carbies being rare........

And even a "good" blow through ( and i'm not convinced thats possible ) doesn't fix the ingintion issues.

Electronics rules.