Roots blower help needed!!
Roots blower help needed!! My boss is building a Weiand roots blown 383 for his 67 camaro. Its the 177 model. His engine is going to be built with all forged components and 8.5:1 compression. The techline at weiand stated that with 8.5:1 on 93 octane the most boost he can run is 6-7psi with a total timing of 28-34 degrees. Why is it plenty of FI guys here an on other sites can run 12-15psi on pump with LT1's and LS1's with centrifigals and turbos, but a roots blown forged 383 shouldnt go over 6-7psi?? Seems odd. I think they said his dynamic compression shouldnt be above 12:1 according to weiand.
I also told my boss to run lower timing (like 18-20 degrees) and just run more boost.
Does the weiand guy know what he is talking about?
I also told my boss to run lower timing (like 18-20 degrees) and just run more boost.
Does the weiand guy know what he is talking about?
Originally Posted by Shon Herron
It might be heat issues, the other styles normally run some sort of intercooler or do not produce as much heat as that type of set up.....
Now that I think about, i dont know of any blower kits out there that recommend running more than 6-7psi with charge cooling. Thats a good point. If that is the case, I assume my boss could make a ton more power with an intercooled vortech.
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Originally Posted by Pro Stock John
-Iron heads? They retain more heat.
-Iron block? They retain more heat.
-No intercooler?
-Also the better the cylinder head the less timing you need.
-Iron block? They retain more heat.
-No intercooler?
-Also the better the cylinder head the less timing you need.
Dart Pro 1 230cc Aluminum heads
It seems like it comes down to 6psi of unintercooled roots blower versus 12-15psi intercooled Vortech T trim. He just doesnt want it to be lazy off the line. I told him he'll roast his street tires with an N/A 383, let alone a blown one. He is caught up on the flat torque curve of the roots. I am trying t tell him that 12-15psi interooled T trim will murder a 6psi unintercooled 177 pro street blower.
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Joined: Nov 2001
Posts: 4,857
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From: Austin, TX
Originally Posted by RealQuick
I am trying t tell him that 12-15psi interooled T trim will murder a 6psi unintercooled 177 pro street blower.
If he wants flat, tell him to skip all that BS blower and put a turbo on.
