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Now With 9 inch LSD Diff
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575 Posts
Discussion Starter #1
Hi all

I know that it is usually with N/A engines the best to put bigger valves and all that in. My question is just wondering if you should do it to turbo engines. I know a person who is building a reasonably powerful I6 turbo and he is wondering if the engine builder is doing the right thing putting bigger valves into it.

all help much appreciated.
 

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100 SPEED LIMITED SILVAEA
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1,043 Posts
yep pay attention to the exhaust side more then the inlet, larger valves on the exhaust, and focus on getting the inlet to exhaust ratio up above 75%

so just clean up the inlet port, and then concentrate on the exhaust sides flow.

cheers.joe.
 

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Now With 9 inch LSD Diff
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575 Posts
Discussion Starter #4
thanks a lot guys

so does that mean if you put to bigger valves in the inlet side it will stuff it or can you do it but it is just not necessary??
 

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Two SC 61's = trouble
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6,360 Posts
Porting and flow is possibly more important than valve size. Besides heaps of torque and power is there totaly with std head.Usually turbo motors don't have to rev that high to make power .Though that depends on turbo sizing etc..EA[ohc] motors on have roller cam etc..Pay attention to timing chain etc...
 
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