Who is running stock ports?
After seeing what Turblown did with the stock port engine, it got me thinking about leaving stock ports for my next build. Who here is running stock ports and making good power? Also would it be stupid to port the exhaust and not the intake?
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I have made 550rwhp on stock ports on normal pump fuel and that was almost 5 years ago now.
Could easily make more with the right turbo and enough boost. |
Originally Posted by rx72c
(Post 11724089)
I have made 550rwhp on stock ports on normal pump fuel and that was almost 5 years ago now. Could easily make more with the right turbo and enough boost.
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28psi at that particular time.
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^ how long (miles) did your motor last at 28 psi? What kind if turbo you were runing? Was that car a daily driver or a weekend car? And do you always run it at 28 psi? I beleive you had some sort of auxiliary injection, you were injecting a lot of water (I may be wrong)?
On stock parts 550 WHP is pretty impressive! Good job! Andrew |
Water injection. Car got driven every few days (mainly got belted)
Motor never died. that setup was like that for around 18 months before the block was sold to a customer which is still going. |
Larger intake ports shift the powerband and do increase volumetric efficiency at high speed, while costing some low end. With stock ports you can use the turbo to make up for that, if you have the right set up.
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Guy out here made I think 731whp on stock ports with a BW S475 and e98 I think.
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Originally Posted by 2RotorsNaDream
(Post 11724759)
Guy out here made I think 731whp on stock ports with a BW S475 and e98 I think.
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I think the stock ports for a street car is good. My engine has a small street port from the owner before me, but I don't think it makes that much of a difference. if I had the choice, I would leave the port alone, that is just me.
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Originally Posted by 94bajakid
(Post 11724899)
holy shit. REW or t2?
Originally Posted by lOOkatme
(Post 11725312)
I think the stock ports for a street car is good. My engine has a small street port from the owner before me, but I don't think it makes that much of a difference. if I had the choice, I would leave the port alone, that is just me.
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There are 100% stock ports then there are the more efficient blue printed stock ports which I have.
Do the same for the stock ports that most do with the larger ports: (1) port matching of all intake manifolds to each other and to the engine block (2) grinding off/smoothing out all rough edges and corners inside the ports, polishing is the extreme of this (3) removing the exhaust ports extended edges from the exhaust stream. None of this affects timing of the ports but reduces turbulence and this increases flow. |
Originally Posted by 2RotorsNaDream
(Post 11725713)
Same here, I did a BW S366 setup with stock ports purposely to get better response and driveability. Should still make upwards of 500whp and that's enough power for me.
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Originally Posted by cewrx7r1
(Post 11726210)
There are 100% stock ports then there are the more efficient blue printed stock ports which I have.
Do the same for the stock ports that most do with the larger ports: (1) port matching of all intake manifolds to each other and to the engine block (2) grinding off/smoothing out all rough edges and corners inside the ports, polishing is the extreme of this (3) removing the exhaust ports extended edges from the exhaust stream. None of this affects timing of the ports but reduces turbulence and this increases flow. |
Originally Posted by arghx
(Post 11726923)
yup, you are mostly addressing imperfections in the manufacturing process while not getting into the tradeoffs of changing port timing.
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Have not finshed my build yet but I will be running stock intakes that have been polished with a bw s366. I have however enlarged the exhaust ports. Hoping to hit 500
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Originally Posted by 94bajakid
(Post 11732592)
any reading material on how to do this? Or is it pretty obvious when the engine is apart?
then you can put the gasket on the engine, and then the intake, and match them to each other |
407rwhp @ 16psi stock port s4 T-II, unleaded gasoline and ball bearing t04s p-trim
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Originally Posted by rx7jocke
(Post 11734198)
407rwhp @ 16psi stock port s4 T-II, unleaded gasoline and ball bearing t04s p-trim
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full boost by 4000rpm to 7500+, i could have it a bit earlier but my ebc is set to delay full boost a little (we are talking a few hundred rpms only).
at 4000rpm i do have over 200rwhp |
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