Blow Through Carby Set Ups...Disadvantages?

[astro boy]

yeah mate it's just a 32/36 dgv weber with a 150x150x80mm vacuum box firmly fixed to the top with a 50mm entry for the boost pipe.

i was hoping some 0.8mm gasket paper will be enough but thought if there is something i can use that i don't have to worry about it than all the better.

as for the hose i just have some of that pov pack black flexible hose, like for pod filters n stuff, should be alright.

[Hurricane]

ok so ur runin it in a box then, never done a setup like this before. hope it all works out.

the pipe ur talkin about should be fine.

[andrew_mx83]

the whole carby is in a box or just the air cleaner bit?

[astro boy]

just the air cleaner

[Hurricane]

u ready need to run the whole carby inside a box, so then the inside and outside pressures are equalized, if not the boost pressure with push the fuel out of the carby and u will get nothing.

unless ur goin to run fuel pressure above boost pressure, but im not sure this can be done with the carby ur using as it will push fuel out of the accelerator pump.

also its not a good idea to run boost into the airfilter, as its a massive restrition and will probly push the airfiltin into the carby..

dan.

[andrew_mx83]

i assume u would have the filter pre-turbo and just the box on top of the carby.

but +1 for putting the whole thing in a box.

[Duk]

Or he can just pressurize the fuel bowl and run a rising rate FPR. As long as the throttle shafts don't leak and the float doesn't collapse, that's the way factory blow thru carbies are set up.

[andrew_mx83]

factory turbo lotuses (lotii?) run the whole carb in a pressurised box

[Duk]

factory turbo lotuses (lotii?) run the whole carb in a pressurised box

No they didn't http://www.lotusespritturbo.com/Lotu...910_Engine.htm

[andrew_mx83]

well there you go then


wow its been a while since i saw one of those, such a beautiful motor to drive but horrible to own & work on.
never drove/worked on a turbo one but in N/A guise with twin 45's (912 engine) it was amazingly flexible & revvy and would put any jap turbo 4 banger to shame..... til it went bang

Lots
Of
Trouble
Usually
Serious

[river]

Hi,

Maybe Lotus learned something from the Jap engines, when back in the 70s they put Lotus cam covers on the 18R-G (or 2T-G) because they couldn't build a better, more reliable engine.

seeyuzz
river

[andrew_mx83]

i had a quick play on a gemini with a blow-thru downdraught weber tonight, i probably shoulld have taken some pics

[astro boy]

filter will be running pre turbo, that's a no brainer.
will try to make it work without eclosing the entire carby as i already have a box made up to sit on top.
yet to modify the carby as i'm not 100% sure how to make it work.

andrew mx83- how was the gemi set up? similar to what i'm doing?

[wrench]

I've also been told with blow through carby setups that the fuel bowl in the carby can get pressurised, i think that was the main reason i got talked away through blow through carby systems. Anybody heard of that before?
Like has been said before, your carby does have to be in good condition otherwise it will just leak.

[NME308]

Hi there guys,
There is a lot of misinformation being bandied around here about blow through carby's etc...

For those who have NOT done blow through before or have not ever worked through the theory before PLEASE checkout the hangar18 website http://www.hangar18fabrication.com/blowthru.html - while it is aimed primarily at Holley carbys it will give you the basics for any carb.

Pope has condensed the info off hangar18 into a nice downloadable file in this thread http://toymods.org.au/forums/showthr...18#post1087396 so please avail yourselves of the information!

Cheers,
Jason