how many horses?
Discussion
ferlin said:
I have a late 60's, 350 ci small block chevrolet, 4 bolt main older type with the larger valve setup,a holley 4 barrel carb and twin rayjay turbo chargers running straight through exhausts.Not sure about cams ect so who would like to give me a rough idea of horsepower please.
I have a program 'Desktop Dyno'
I selected a street 350 as the basis and added a single Rayjay 300E.
639hp at 6500rpm
576 lb/f at 5000rpm
If you had more info the figures would be more reliable.
Steve
steve_D said:
I have a late 60's, 350 ci small block chevrolet, 4 bolt main older type with the larger valve setup,a holley 4 barrel carb and twin rayjay turbo chargers running straight through exhausts.Not sure about cams ect so who would like to give me a rough idea of horsepower please.
I have a program 'Desktop Dyno'
I selected a street 350 as the basis and added a single Rayjay 300E.
639hp at 6500rpm
576 lb/f at 5000rpm
If you had more info the figures would be more reliable.
Steve
wow! thats a good programme!!Must be at least that then.
Thanks Steve
steve_D said:
I have a late 60's, 350 ci small block chevrolet, 4 bolt main older type with the larger valve setup,a holley 4 barrel carb and twin rayjay turbo chargers running straight through exhausts.Not sure about cams ect so who would like to give me a rough idea of horsepower please.
I have a program 'Desktop Dyno'
I selected a street 350 as the basis and added a single Rayjay 300E.
639hp at 6500rpm
576 lb/f at 5000rpm
If you had more info the figures would be more reliable.
Steve
Yeah i also have that program, its pretty decent at giving a good guess.
Way too much power is almost enough...
Go to www.mortec.com and find the casting numbers for your heads, that will give you the most info on how they flow.
Without knowing more about the engine, I would hazard that a nearly stock 350 on two turbos could push 550'ish before you need to start beefing it up. Get a forged crank, rods, and pistons, and you're good for an easy 650.
Then intercoolers, fuel injection, and nitrous... come on... you know you want to... the sky is the limit (or in my case, the bank is the limit!)
Gary
Go to www.mortec.com and find the casting numbers for your heads, that will give you the most info on how they flow.
Without knowing more about the engine, I would hazard that a nearly stock 350 on two turbos could push 550'ish before you need to start beefing it up. Get a forged crank, rods, and pistons, and you're good for an easy 650.
Then intercoolers, fuel injection, and nitrous... come on... you know you want to... the sky is the limit (or in my case, the bank is the limit!)
Gary
You need to consider the rpm's that you plan to use. Rajay's/Rotomasters etc are all a bit old these days plus Desk Top dyno doesn't allow for 2 turbo's as far as I'm aware which rather screws things up.
Best you can do is approximate the cfm required, number of turbos and density ratio. That will put you in the ball park. Look for a book by Hugh McInness called turbocharging. He simplifies some of these options.
I reckon you will have between 450/550 hp and a shedfull of torque if your compression's been lowered.
Best you can do is approximate the cfm required, number of turbos and density ratio. That will put you in the ball park. Look for a book by Hugh McInness called turbocharging. He simplifies some of these options.
I reckon you will have between 450/550 hp and a shedfull of torque if your compression's been lowered.
I am running a single RayJay 301E10 on a 350 smallblock and make about 475-500hp at 9 psi. This is maxing out the turbo and its much happier at lower boost - about 6psi where it makes 425-450hp.
This is on pump gas with water injection and 7.9:1 compression.
If you get the numbers on the turbos, you can figure out the wheels that are in them and the exhaust A/R.
Most any pair of Rayjays would be fine for a 350ish cubic inch motor, but some only flow enough air for about 250hp each, and some flow enough for over 500.
This is on pump gas with water injection and 7.9:1 compression.
If you get the numbers on the turbos, you can figure out the wheels that are in them and the exhaust A/R.
Most any pair of Rayjays would be fine for a 350ish cubic inch motor, but some only flow enough air for about 250hp each, and some flow enough for over 500.
Closest you will find to that easily is a 'big' Escort Cosworth Turbo, TB34, which uses the compressor slightly bigger than you specify, although still on a T3 0.48AR turbine housing.
0.63 housings are available, though not sure who is best to buy from. They are available from the US easy enough.
I have 2 of these turbos, without exhaust turbine housings, if you are interested. I have 0.48 Saab style turbine housings, although they arent that good a design.
Compressor section is TB34, T04B, S-trim, on a T3 turbine shaft.
Garret pt# Garret TB34 452069-0001
compressor minor 1.9", compressor major 2.75"
These are currently awaiting repair, due to very minor oil starvation damage, after my own engine melted a piston, and blew the oil from the sump.
Both turbine shaft, and compressor section are in mint condition.
Thrusts and bearings are very lightly marked, as is bearing housing. These will be repaired/replaced as necessary if a buyer is interested.
Thes cost me about £1600 new. Offers ??
mail me if you are interested
stevieturbo@yahoo.co.uk
0.63 housings are available, though not sure who is best to buy from. They are available from the US easy enough.
I have 2 of these turbos, without exhaust turbine housings, if you are interested. I have 0.48 Saab style turbine housings, although they arent that good a design.
Compressor section is TB34, T04B, S-trim, on a T3 turbine shaft.
Garret pt# Garret TB34 452069-0001
compressor minor 1.9", compressor major 2.75"
These are currently awaiting repair, due to very minor oil starvation damage, after my own engine melted a piston, and blew the oil from the sump.
Both turbine shaft, and compressor section are in mint condition.
Thrusts and bearings are very lightly marked, as is bearing housing. These will be repaired/replaced as necessary if a buyer is interested.
Thes cost me about £1600 new. Offers ??
mail me if you are interested
stevieturbo@yahoo.co.uk
what sort of power are you after and what car is it going into? try having a look at these to forums. there is some interesting stuff on them regarding forced induction of US V8s (manly LS1s but may give you some ideas).
www.ls1tech.com
www.corvetteforum.com
hope this helps and keep us posted
thanks Chris.
www.ls1tech.com
www.corvetteforum.com
hope this helps and keep us posted
thanks Chris.
The turbos would be without turbine housings anyway. As I said, the ones I have are 0.48, and not much good anyway.
You would need to source your own turbine housings.
Or it may just be cheaper to buy complete turbos from the US to suit your needs.
www.forcedinductions.com/
You would need to source your own turbine housings.
Or it may just be cheaper to buy complete turbos from the US to suit your needs.
www.forcedinductions.com/
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