Inliners International Forums General Discussion Engines turbo charging a 250

I have a 64 chevelle that has a 230 and I'm looking and going to install a 250 in it and I want to put in twin turbos on it. I am going to hot rod the rest of the engine but I would like to know if anybody has done this before or any advice would be nice.
Thanks
Bill

bill, a single large turbo would be much easier to work with. i've getting my 292 ready for a turbo. i now have the turbo, cam, and many of the other related pieces. i'd be happy to exchange ideas with you. i'm also fuel injecting mine. tom

It looks like your putting it in a 65 El Camino. If you are do you have to cut the hood to get a 292 in there? I wasn't sure if it would fit with the hood. Is your turbo an aftermarket one or is it off of something?
Bill

I have long term goal of turbo charging my inline 250. It kinda looks like the easiest way to make unnatural amounts of power. The low compression, non-crossflow head and main bearing per rod are perfect for a turbo set up. Given the cast pistons and whatnot aren't, but what can you do.

I've read in a number of places (and it makes sense) that one larger turbo tends to be more efficent than two smaller ones. Secondly, by the time you incorperate waste gates and blow off valves and all the plumbing and whatnot you're already talking about quite a bit of custom work. I imagine two turbos would be more difficult by quite a bit. And anything that's harder with no gain doesn't make sense to me. just my opinion though, maybe for show quality it'd be worth something to somebody?

My first goal is fuel injection. There's more on that in the other post running (on aiming injectors) but I figure overall if I want to get my money out of a turbo, I need fuel injection.

I'd like to do the fuel injection but I dont have the funds to do that. I think from what I have heard so far that I will go with a single turbo. What is a good turbo to use?

Get Corky Bell's book on turbocharging and read it. It will save you a lot of time and misadventures.

Hey Everyone, I am currently building a turbocharged 250 for my 67 camaro. I am going to do it in Two stages -
1. I have a turbocharger off a 1985 Riveria T-Type (basically a Grand National)with a waste gate I am going to bolt on. I am looking for a offy intake and put a edelbrock or carter afb 4 barrel on it (there design works well with blow-through turbocharging). I am going to pick up an aeromotive boost referenced fuel pressure regulator with a holley electric pump tied to it. I will be using the stock exhaust manifold.

The motor is completely stock at this point except a head I got off ebay that has new valves and I will slightly port the head. I still haven't decided how I am going to retard the timing in reference to boost pressure. MSD makes a nice boost retard box. I can't find any boost retard/vaccuum advance systems for my HEI (or any other distrubtor) like people keep talking about. I will also put in a intercooler to help detonation and increase performance.

2.-IF this works well and it gives me enough power I will rebuild the engine with forged pistons (retaining 8:1 compression ratio) to allow me to turn up the boost pressure to make real power. I will do some more port work, four angle valve job, better cam, etc. Then I will work on fuel injection (I am on a budget so probably megasquirt).

I am on a budget and I am still not totally sold on the idea that the 6 will give me enough power ( I love the look of the 6 and that its different, but I love power!). Thats why I am doing it in stages. I don't want to make a big investment and get nothing in return. I have a 327 in my garage I will put in if I can't get this 6 to go decent and yet stay reliable.

I have been researching this for a few years and read the book by Hugh Mcinnes (last name spelling?). Its a great book. He doesn't really get into fuel injection though which I think would be the ideal setup. I also have the book Chevrolet Six Cylinder performance manual - can't remember the author. Good book. I suggest reading it. The author goes into turbocharging, supercharging and nitrous.

Sorry for the long post!
Good Luck!

Jeremiah

Jeremiah [/QB][/QUOTE]

Hugh's book was good many years ago. Read corky Bell's book.

if u want to use two turbo's i would suggest using a smaller turbo that will spool up rather fast in the lower RPMs like maybe a 2.2 probe turbo to spool up a larger turbo like a T3 or something...but as far as detonation goes, u can upgrade ignition to retard timing under boost or u can install water injection that turns on when under boost...u could possibly run the jet size larger for crappy gas mileage, but then u wont be running out of fuel when u spool up either...and as far as pistons fo u can get some really nice forged ones for 650.00 - http://www.cquesttechnologies.com/fspp

I wonder how far the cast pistons will go on boost. Realistically if I kept good and rich in the boost and maybe ran a little intercooling there wouldn't be much to break them. It's just when you get detonation that things break.

u could most likely run easy 7 lbs of boost...9 if u mod a few other parts...its more about how u prevent the detonation as well though, like u said...but when u put a certain amount of power through i think a good idea would be to upgrade the valvetrain...get some better rocker springs at the least...i would get roller rockers and the works though just so u have a clear consience that its not gonna fail cause of that.

Yeah, that's probably true. I read some where that when you start talking about significant boost then you need to think about the valve train. 12 lbs of boost on the back of an intake valve is going to be pushing down with a fair bit of force, even more so is pushing on the bottom of the exhaust valve.
I also know that turbo motors usually just keep making power as the RPMs go up. I could just see myself getting power crazy and keeping on the pedal so long as I felt the rush....... and looking down and seeing way past redline just in time to hear something break

Ed, I have a friend who worked for Corky Bell when he was here in Dallas and the guy was Great.I think I remeber something about a book he was trying to get together but never knew it was published. Where are they available? Paul

Book is 'Maximum Boost' Designing & Installing Turbocharger Systems. Available thru Amazon or his website: bellengineering.net or BEGi Performance Engineering.

i don't have regular internet access. my turbo is a turbonetics 62-1. i am using a intercooler , wastegate and blow off valve. i am also using port fuel injection and timing controlled thru a modified hei. the 292 just fits under the hood. i had to use a flat valve cover oil cap instead of the normal breather. if using a carb an air cleaner is difficult to fit. i had to notch the lower part of the hood and run a edelbrock triangle shaped foam air cleaner. tom

a really good item to use for turbo charging is the metal bonnet from a tempo, topaz or taurus...i got mine from a tourus for a ram air setup...its solid metal and is very strong and is quite easy to plumb line to from the turbo...although usually the hole needs to be enlarged to fit the carb unless u have a Carter RBS 1bbl carb which would not be good enough i dont think for turbocharging anyways. and its about as tall as the triangle eldebrock filter...maybe even a bit lower.

How about some px?

I would love to see pics of these. Maybe one of these days I´ll add FI and a Turbo to my 292.

u want pix of the bonnet from the taurus that i mentioned? I'll see what i can do...but here are some turbo sixes. sorry to 56K modem users.

OK Guys - a basic tutorial on posting pictures:

Until we can afford a BB that has some more functionality, PLEASE insure that your images are no more than 640 x 480in size. It is your responsiblity to size the image with whatever imaging software (PhotoShop, Picture It, etc) you use, BEFORE you send it your web site or photo album. Then, when you link to that album with the "image" button in this B-Board, it will display a properly sized image.

Make sure that your image is optimized for the web. Most imaging software includes something like a "Save for Web" feature. This dramatically reduces the image size to a compressed format. We still have a lot of users with not only 56K but 28.8K modems. Please keep this in mind.

If you run into problems with editing a post, contact the webmaster or forum moderator. We are here to help you, within reason. That does not include writing HTML code to size an image.

I'm really sorry about that Jack, I sent an email to u guys, so hopefully the problem will be fixed and i can resize the pics. I will remember to make them smaller next time.

No problem - some BB's do this sizing automagically, but we're the bargain basement model! We should have posted these guidelines when we made the last upgrade, but it's hard to integrate this kind of stuff into the FAQ.

actually I was wanting pics of turbo 6s. Those are cool, but do you have any Chevy pics (250/292 would be greatest).

that last one with the pvc pipeing and the rad cap to keep track of boost pressure. thats scary wheres the duct tape. . . im hoping thats just a trial?

sorry, I dont have chevy turbo pix...but the idea is the same, just on the other side. actually the pcv setup isnt bad at all...a turbo doesnt generate so much pressure that its all gonna blow when u boost...its a cheap and effective method..actually the radiator cap is a good idea too, i never thought of that before. PCV piping is what i would use too though, it handles heat quite well, and its not really gonna get all that hot anyways, but its tough stuff, I have a few things in my car that are made from pcv, and its mounted faily close to my exhaust, no problems and its been on for about 6 months now.
but heres the site for the last turbo pic...it has everything about it...so enjoy the read (I actually forgot about that link which is why i never posted it before)

i just don't know about using PVC pipeing for a Turbo. the air going thru the turbo is going to get quite hot so for short runs it wouldn't be bad but for a long trip id be a little scared. from what ive read some were some pvc pipeing can give off nasty fumes when heated to much.
as for the rad cap its a little red neckish but i guess it will do what it suposed to.

I went on to www.matweb.com and did a search for "PCV." I looked at about 5 of the entries for PVC, all of which seemed to be what we were talking about. I was looking for Maximum Service Temperature, Air, which was about 170 average, and 203 max for the PVC types I looked at. This would mean that the absolute max temp you wanna run is 170F and that's with ZERO safety. If you've running PVC pipe you're probably not talking about enough boost to heat intake air temps that high. What scares me is heat soak when you shut down the turbo. It seems like the turbo might heat enough from the exhaust that it'll cook the plastic touching it. He looks like he has some room there though.

Personally I don't think I'd run it. It looks like you could get away with it but I'm not sure I would do it. I'll just stick with predictable steel. But that's just my opinion.

yea...steel would definitely be the best way no matter how u look at it i guess. although if that setup was on my car it might be fine cause the PCV would be right in the path of my airflow, since i have a hoodscoop, so that would cool it down too. i dont suppose steel is all that much more expensive so u might as well do it right and make it strong as u can the first time, it would sure suck to have the PCV go on u when u floored it. i havent seen metal piping that is short and bent nice like that, although its probably out there, not sure what it would cost though.

Slayer,

You wrote: i havent seen metal piping that is short and bent nice like that, although its probably out there,

Use exhaust pipe tubing. It's avaliable in many sizes and bend radius. Cut and weld to suit your application.

Jim

haha..i've never actually checked the exhaust tubing section before, heck I just started working on the car a year ago...havent got to the exhaust stage yet, lol...but yea, ok, I'll check it out. doh i feel stupid, lol.

Slayer, I get that feeling all the time. I've been working on cars for about 2 years now. Somethings I know a bit about, sometimes I know nothing about.

'Red neckish,' is this a new term? I haven't seen it used before?

"I'm not a redneck, it's just a sunburn."

well, I am DEFINATELY a redneck .

i dont consider myself a redneck but i think it would be freakin sweet to stick a push bar (or whatever those things are called that go on trucks in front of the grill) on the front of my car, lol. but i think i found a chevy pic of a draw thru turbo setup

What chevy is it? It can't be the 194-230-250-292 cause I see 6 individual intake runners. Still, it's cool. I've had so much trouble designing my intake because of those darn siamesed intakes. Not to mention the bolt patterns on the block. I wanted to have a 3X2 EFI setup until I realised how hard it would be to simply bolt it on.

Thats not a chevy. Looks more like a mustang.
Chevy2s have a 4bolt shock Mount.}[oooooo]

Trueslayer,
Who's car is that with the Eaton M-90 supercharger in a draw through setup? I am builing one right now for my 292. Any updates on the long term reliability would be great. I was told that the teflon coating on the rotors wouldn't hold up to the gasoline.

Suck through systems are obsolete. Read Corky Bell's book.

Technically speaking the engines talked about most on this board are obsolete. But here we are none the less. Sometimes things that some people think are old or outdated hold different value for others. I love my old, outdated, obsolete 6 cylinder.