target 200whp or above


I don't quite understand what you mean by high displacement and low compression.

The 16B has a high dome and has relatively low compression if that's what you mean? But it's also an 81mm piston.
 
I mean the B16B block equipped with 85mm (CF4 piston). The low compression of engine due to open the head chamber more bigger than piston size.
 
Are you talking about having to resleeve your block before you put 85mm pistons into an 81mm setup?

If that is the case, then you have to plane/shave the head and/or deck the block to raise the compression.

I wouldn't bother with all these compromises and would just get the proper pistons to begin with.
 
raging angel, looking at the pic u've posted (the one with the duck tape), closed airbox does hv its advantage...
 
ntahlerz said:
raging angel, looking at the pic u've posted (the one with the duck tape), closed airbox does hv its advantage...
Click to expand...

We observed a 5-8whp loss when the filter was exposed and not blocked off from the heat.

We were already using E85 ethanol which cools the intake charge and still saw this loss.

As stated before, if the rules allowed it, we would have sealed the bottom of the box to enable ram air, which realistically might have produced another 3whp MAYBE...but this is club racing, where motor preparation is extremely limited. Even if it's 0.5whp gain...we'll take it!
 
how about if using thermowrap on the exhaust header without closed air box?Does have any effect on horsepower?
 
mattop_speed said:
how about if using thermowrap on the exhaust header without closed air box?Does have any effect on horsepower?
Click to expand...

the block radiates heat too, so I would guess the header wrap helps but over time the engine bay will heat up enough to tap engine power.

Dense cold air is GOOD! :nice:
 
wrapping the header is definitely a good idea. The best of course is to have it coated with something like from swaintech and then fabricate a heatshield.

It might be commonplace to see on a Honda, but the header/motor design is kind of dumb in some respects because it heats
1) the radiator
2) potentially the intake
3) power steering
4) oil pan

So isolating the main heat source is definitely a good idea.
 
RagingAngel said:
wrapping the header is definitely a good idea. The best of course is to have it coated with something like from swaintech and then fabricate a heatshield.

It might be commonplace to see on a Honda, but the header/motor design is kind of dumb in some respects because it heats
1) the radiator
2) potentially the intake
3) power steering
4) oil pan

So isolating the main heat source is definitely a good idea.
Click to expand...

...which is why I think a K is a better design.
 
If using a B20 crankshaft,and make a knife edge on the crank...Is a good setup for Drag? Does have effects on the torque and horsepower? I would like to have my friends opinion or suggestions...
 
my engine setup...
b18c gsr
p73 pistons
skunk2 tuners stage2
skunk2 valve spring
skunk2 pro intake manifold
rsr header

dyno dynamics 193 whp....

if you dyno with dynojet the figure would be 200whp++
 
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