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Old 12-28-2008, 09:46 PM
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Another turbo question

Well i know this has probably a drug out topic, but right now i'm running an edlebrock 600 carb, aftermarket cam (i dont know what profile) corvette bottom end, 327 heads with 64cc chambers i believe. I'm not aware of the CR but i was wondering what max boost i could possibly run on this set up, I'm only looking to run a single hybrid t04e turbo running maybe 6-12 psi max.

Would this set up be able to hold up to that?

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Old 12-29-2008, 07:04 AM
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Quote:
aftermarket cam (i dont know what profile) corvette bottom end, 327 heads with 64cc chambers i believe. I'm not aware of the CR but
Ayuh,...

Considering you've provided No information about your motor,...

How can you possibly expect a realistic Answer.....

What the 'ell is a "Corvette" bottom end,..??

Which 327 Heads,..??
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Old 12-29-2008, 07:08 AM
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Quote:
Originally Posted by bondo
Ayuh,...

Considering you've provided No information about your motor,...

How can you possibly expect a realistic Answer.....

What the 'ell is a "Corvette" bottom end,..??

Which 327 Heads,..??

LOL, yea I love people who assume that just because it was in a vette its something better- there were a lot of crap engines put in vettes. Some good ones too, but a lot of crap mixed in there.

The easiest way to get a rough guess is to give us a cranking compression number Idle speed and vacuum will help too. Its still rough but its better than nothing.
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Old 12-29-2008, 09:59 AM
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No. Put down the turbo and walk away

Like I've said before, building a turbo engine is an in-depth process that requires planning right down to the ring end gap and bearing tolerances. You haven't even provided us with the SIZE of the engine, you don't know the compression or cam, and most likely everything in that motor is ancient cast parts that have been beaten on for 30 years. Suddenly adding 6-12 psi is a recipe for disaster.

Not to mention, why would you spend $3000 on installing a turbo and put it on an engine that's worth $200?

Wow.
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Old 12-29-2008, 10:45 AM
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Well I know the bottom end is from a 1971 corvette, freshly rebuilt, with new pistons and rods, Just don't know what kind. Thats why i said it's stock.

And considering that my name is 68nova350, i would assume you caught on that my engine is a 350.

the heads are the 327 truck heads with 64cc chambers from a truck

And all i'm been told is that its solid not hydraulic. and i know that has to do with valves. But i was told the cam was aftermarket from my mechanic.
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Old 12-29-2008, 11:32 AM
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Quote:
Originally Posted by 68nova350
And considering that my name is 68nova350, i would assume you caught on that my engine is a 350. .
We also have a HemiZach, a Tuske427, and a Stovebolter... none of whom have the engines their name suggests. My name is Curtis73, but I don't have a 1973 vehicle.

Solid cam implies long duration and lots of overlap. Terrible choice for a turbo. Also, not knowing if the pistons are dished, flat, or domed means it could be 7.5:1 or 10.5:1 compression or anything in between. If it was rebuilt, chances are you have cast pistons that cost about $8 each. I wouldn't boost them. Stock SBC rods are fair since they are forged, and stock cast cranks are fair up to a certain HP level. The heads also don't flow very well, so adding a turbo would be like trying to blow more air through a straw.

I'm not busting chops, but to build a serious turbo motor, here is what you need to know, and then most of it you'll have to modify:

Ring end gap
bearing clearances
cam duration, lift, LSA, installed centerline
compression
ignition curve and lead
type of pistons, rods, crank, and if its a 2 or 4 bolt
head flow
intake design
carburetor flow (and that needs a ton of modification to work with a turbo)
transmission torque capacity
rear axle torque capacity
tire size and compound
suspension geometry

This list can go on for pages. I'm very serious about this... when you say that you have a 350 with unknown compression, unknown cam, unknown internal parts and you want to put a specific turbo on it, that is like saying, "I have a car. I'm not sure what it is but I think its front wheel drive. Can I put a big block Ford engine in it?"

WAY more information is needed.
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Old 12-29-2008, 12:03 PM
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no matter what your setup is. A single T04e in any trim is to small for a 350.

you need a T-series turbo (T61 to T66) to run a single.

you would be most likely better off bolting on a mini-blower.

if a stock low performance 71 350 vette has 8.75:1 cr with 76cc heads then cr would be 9.9:1 cr with 64cc heads. which is, too high for boost for an old 350 and pump gas.

find some 76cc heads and 6 psi of boost should be ok with a mild cam and a msd timing retard system.
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Old 12-29-2008, 12:16 PM
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Ok, so i was reading on another forum twin t25's or 14b's would work. Since i have those i think i may just do that.

I was definitely planning on running different heads. and probably doing a full tear down to make sure what parts i have.

Not knowing to much about this engine isnt a good thing. But as far as i've read, almost any engine can run 5 pounds of boost.
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Old 12-29-2008, 12:29 PM
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I would use twin T3's (super 60's) for a low boost/low rpm 350. max 10 psi of boost and max rpms of 5500. T25 are too small.

a 280zx turbo is a nice car to get those turbo from. they also have an internal wastegate which makes it cheaper. I get them from my local u-pull-it junk yard for 40.00 a piece.

better to use an efi system like megasquirt with a turbo.

would need to change to carbon seals for a draw through carb setup.

if you are on the verge of detonation then adding 5 psi of boost is not a good idea.
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Old 12-29-2008, 12:29 PM
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curtis goes a little overboard sometimes. Just about any 87 octane engine can run 5psi boost as long as you intercool it and have the proper fuel system to go with it. It'll be far from optimal but it'll work. If you would get me the stuff I asked for most of us could guess close to your cam and compression. If you only have 135ish psi cranking compression you should be able to run 5psi fine. If its around 190psi then you'll need some good heads to run it.

This is provided your car idles at about 800RPM with about 15" vacuum (indicating you have a smallish cam).
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Old 12-29-2008, 12:32 PM
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the car idles at 800 at 14 degrees.

i'll see if i can get my compression numbers here soon.
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