Just got a deal on 2 twin turbo setups for a 460 Ford from another puller. He was alcohol injected and was having nothing but problems. I would like to go back to carburation and go to a draw thru system. Has anyone had any experience with turbos and 460s? Does any one have a source on forged dished 460 pistons that don't cost and arm and 2 legs? thanks

Bountyhunter

 

There a 460 twin turbo site by somebody who runs them in passenger cars. Very detailed, and current about a month ago. I can't find the site in my directory, but maybe someone else has it. Or maybe a search.

 

I'm using the tried & true TRW replacements(ash tray). Eventually will have my 88cc BT heads on it but will use D0VE-A's with bigger chambers. Gonna be a blow through for awhile too. Got a line on a carb bonnet & will use my 935DP on it. Mines using shorty headers, upside down on the wrong side to go to the turbos & 3" dowmpipes to get it under the truck. Figure from experience with 460's a reliable, to the wheels, about 600 ponies with the BT's & little boost. You gonna boost one you better get a good Motorsport block... I have pics for the 14-71 explosion last week on the dyno... not pretty :-X23

 

Try this link for a twin turbo 460 Eric
http://www.geocities.com/MotorCity/Garage/1378/fairymont.html

 

[updated:LAST EDITED ON 06-Nov-02 AT 04:37 PM (EST)]Draw through systems have many downsides, and would not recommend going that rout. Blow through has worked far better for me giving better throttle response and far better drivability. With a blow through system the carb can stay in the stock location and use stock linkage, with draw through it cannot. Another plus to a blow through system is you can use an intercooler. Using an intercooler is not possible with a draw through system because the fuel from the intake charge drops out and pools in the intercooler and ducting. Introducing fuel before a turbocharger is a bad idea in my opinion. I have seen turbo's from draw through systems wehere the engine backfired and ignited the air fuel mixture downstream of the carb and turned the turbo into an expensive bomb. Ruined compressor housings, bent fins on compressor wheels, and twisted turbine shafts are all possible results of a backfire in a draw through system. With a blow through system you have to use a boost sensetive fuel pressure regulator to turn the fuel pressure up with the boost. If you don't do this the boost pressure will work against the fuel pump and blow all the fuel out of the float bowl of the carb. Aeromotive makes really nice boost senseing regulators, Mallory makes one also.


1978 F-150 4x4
1998 Crown Vic Police Interceptor

 

What carbs are you running with a blow thru system? Do you have any pictures? Did you just build a pressure box around the carb? Lots of questions.

Bountyhunter

 

[updated:LAST EDITED ON 11-Nov-02 AT 09:10 PM (EST)]Demon- 975 CFM Race Demon GC (General Competition)

I met a guy running a carbed turbo Mustang, and he told me good things about ( www.performancecarburetors.com )
You tell them your application and they will build you a carb to match.

1978 F-150 4x4
1998 Crown Vic Police Interceptor

 

[updated:LAST EDITED ON 11-Nov-02 AT 09:33 PM (EST)]The reason some people box the carb is so the outside of the carb is under the same pressure as the inside of the carb so fuel does not blow out around the throttle shaft's under boost. You can have a groove machined in the carb body to accept a small o-ring around the throttle shaft's to seal them but I dont think it's needed unless the carb is old and the bushings are worn around the shaft's. If you use a new carb with good bushing's around the throttle shaft's you won't have any problem. At least I havent. I also have a Dune Buggy with an OLD Weber progressive 2 barrel that I run 15psi through and it leaks slightly, but not enough to be a hazard, or enough to make me go through the trouble of building a box around it.
I have a bonnet on my carb that is home made, but it looks very similar to this one.( www.performancecarburetors.com/bonnets.htm )

1978 F-150 4x4
1998 Crown Vic Police Interceptor

 

[updated:LAST EDITED ON 11-Nov-02 AT 09:44 PM (EST)]Oh yea, Get both of these books. They are available online and most book stores can order them if they don't have them in stock.

"Turbochargers" by Hugh MacInnes
and
"Maximum Boost" by Corky Bell

There is tons of really good info in them, and if you are serious about any turbo project you should have them.

1978 F-150 4x4
1998 Crown Vic Police Interceptor