Thread: 200 I6 help

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I'm seriousely considering compleatly rebuilding my 200 I6 as at my autoshop class I have all the tools and resources to do it, and it has 104k on the odo, and it needs it, I was going to just get a new cyl head ( 1 with bigger chambers to lower comp for Turbocharging ) and re ring the pistions. now I'm thinking that I will get new dished cast pistions and the a cyl head with a .040 thick head gasket, of course all new bearings, probably a stock 250 camshaft as it makes the smaller engines a slight bit hotter, but still very streetable. this will be running a draw through T3 super 60 turbo, and because of this I'v read that you need a boost refrenced power valve, and that I would need a Holley Blower carb, but the smallest carb they sell is 600 CFM, is that to big figuring in that a draw through setup needs extra CFM? the static compression will be 8.4:1

how do I modify a carb to see boost? if I don't modify it, it would see vac, and the power valve would make the mixture go lean, under boost that would be detrimental. I know that it is possible to make them see boost, just not shure what is done.

Matt, I know you've seen this formula for cfm/boost before. Let's look at it again....

The size of carb(s) or CFM required for a given application can be calculated by the following formula A: {(CID x RPM) ÷ 3456} x {Boost ÷ 14.7) + 1} = CFM required. The amount of CFM required will determine carburetor size and quantity. If you try to use a carb with less CFM than required, performance and economy may be greatly reduced.

Using this formula and plugging in 200 cid, 5,000 rpm's and 6 lbs of boost, you find that you will need 404 cfm. With 6 lbs of boost and 8.4 static c.r., your final compression ratio under boost will be 12.0:1, the limit for pump gas.

What you're interested in is a blow-thru system where the turbo only compresses air and the carb is reworked to withstand the pressure. Spend the dime and call these guys and get the straight scoop, then report back here please. I'd like to know what they have to say.
http://www.performancecarburetors.com/blowthru.htm

Originally Posted by techinspector1

Matt, I know you've seen this formula for cfm/boost before. Let's look at it again....

The size of carb(s) or CFM required for a given application can be calculated by the following formula A: {(CID x RPM) ÷ 3456} x {Boost ÷ 14.7) + 1} = CFM required. The amount of CFM required will determine carburetor size and quantity. If you try to use a carb with less CFM than required, performance and economy may be greatly reduced.

Using this formula and plugging in 200 cid, 5,000 rpm's and 6 lbs of boost, you find that you will need 404 cfm. With 6 lbs of boost and 8.4 static c.r., your final compression ratio under boost will be 12.0:1, the limit for pump gas.

What you're interested in is a blow-thru system where the turbo only compresses air and the carb is reworked to withstand the pressure. Spend the dime and call these guys and get the straight scoop, then report back here please. I'd like to know what they have to say.
http://www.performancecarburetors.com/blowthru.htm

I was planning on running the Draw thru because the Turbo I have is set up for it, and also so that I wouldn't have to refrence the fuel pump. I know the mods for a blow through carb and on www.fordsix.com/forum there are basic instructions on how to. I was planning on running 6 PSI of boost, using an external wastegate. Is there any disadvantage to running a Draw Through setup? Thanks for the Help. I know that Kelly Mclearen runs a '63 Falcon with a 250 I6, running a blow through 350 CFM Holley 2300 2bbl, other mods to the engine such as forged pistions and the block is oringed, but she runs 11.25 in the 1/4, and the car is streetable. runs like 11 PSI of boost.

"Is there any disadvantage to running a Draw Through setup?"

Nobody does it anymore. They all say it won't work right. I don't know, never did it. Talk to the guys at the carb shop.

Originally Posted by techinspector1

"Is there any disadvantage to running a Draw Through setup?"

Nobody does it anymore. They all say it won't work right. I don't know, never did it. Talk to the guys at the carb shop.

I sent them an Email yesterday asking that question, havn't checked my Email yet

I just got back from Performance Carburators, they could build me a 450 CFM holley 4bbl both draw through and blow through, $600 ither way. said that Blow through will make more power but the fuel preassure has to be refrenced with boost. Maby I'll go blow through and get a rebuildable 350 CFM Holley 2300 2bbl, and convert it to Blow through. Only thing I'll have to add then is a Blow Off valve. I'll probably get a new T3/T4 Turbo off Ebay, there is a guy who buy's true Garrets factory direct and sells them for about $350, the normal price for 1 of the Cheap China turbo's. probably intercool also.

OK, new question guys. I'm really considering EFI after some thinking. I'v heard that 1980's 2.8 V6 GM Throttle Body Injection swaps on Ford small 6's and most other Even fire 6cyls, including Mopar / 6's. my question is, will the 2.8V6 computer be able to run with Forced Induction?

UPDATE. I found out that I could easilly lower the compression to 7.6:1 using the 62cc heads and the dish pistions, with a .050 head gasket which is made. Guy who co wrote the Falcon 6 Performance Handbook cleared that up for me.