turbo/supercharging blow through 34adm weber

[Anonymous]

hiya guys now you are all prolly gonna reccomend go efi but i dun wanna too expensive and it removes the oldschool part
i have a 2l cortina and am wanting to supercharge it using a sc14 of a toyota engine ive worked out that 10psi is a easy number without stuffing around too much the reason im asking this here is cause the carby is off a xf falcon its a 34 adm weber that bolts straight onto the 4cyl manifold so i thought cool more fuel makes life easier than rejetting the standard 2l carby

now what mods do i need to do to be able to run boost through the carby

many thanks
casey maggee

 

[xctasy]

I've looked at this before. I had a small IHI turbo on my British 2.3V6 TF Cortina, and boosting is a great option. I had only 6 pounds, and it was only a 115 hp engine with high miles. I flicked it to concentrate on my Falcon.

If you want to do no internal mods, then you have to accept a 3.5 pound boost limit, and a measly 15% power boost.The carby will be aok. Go to 6 pounds, and you'll have to boost reference the carb, or place a brazed up box around the carb. Then you get a 30% or so boost. You have to change the fuel pump to a Facet or other carb electric pump to get enough pressure to stop float level and other delivery problems..efi ones are too higher pressure.

If your car started off with a stock 100 hp or so, then you only get 130 hp. But if it was modified to a 264 degree cam like the Erson 134 David Vizard used to recomend, then you could get up to 130 hp with a good big valve head, Sierra rockers, extractors, and the right compression. I'd limit it to the autos 8.2:1, though, and run a good electronic ignition set up from the last Cortina 4's. With the compression drop, there would be 120 hp, and a really solid 160 hp or so boosted. And instead of the lowly 110 lb-ft(150 Nm) an early pre 76 Cortina kicked out, the cam and other mods would give 120 lb-ft (165Nm) and 155 lb-ft (210 Nm) boosted.

If you go for 9 pounds or more, the thing starts to set sail.

I can't help but poison you with what I considered. A silly old pre 1970 221 or 200 six with a 2V head is very light, and would be a perfect set up. Unlike the later Cortina Sixes, these blocks were 42 to 27 mm lower. This would only be 100 pounds heavier, and would not need the big recess in the front radiator support if you used an earlier Commodore radiator. Theres about 90KW/240Nm with a 200 2v, and 95 KW/265Nm with the 221. A six cylinder Top Loader and then boost it. An ADM34 would fit with an adaptor, very nicely.

The SC12 is a great little blower, but you need to start with lots of ponies first!