Anyone try to fit a 74mm TB on stock AP1 manifold?
#1
Anyone try to fit a 74mm TB on stock AP1 manifold?
Hi,
I'm aware that there are negatives associated with increasing to 74mm but I have a 2.4L stroker. I recently upgraded to a 3.5" intake that will soon expand to 4" just before the TB (to slow the air down, increasing pressure, before tapering into the throttle body).
I'd like to upgrade the intake manifold but there are fairly limited options that aren't $2k or more.
SO long story short: I'd like to temporarily pair a 74mm skunk2 TB with my stock AP1 manifold. But I have my doubts the throttle plate won't hit the AP1's 64mm intake manifold inlet. Yet Skunk2's site says their 74mm will fit the 00-05 s2000...
But this post says that a 69mm TB is the largest that can be paired to a stock AP1 manifold.
Thoughts?
I'm aware that there are negatives associated with increasing to 74mm but I have a 2.4L stroker. I recently upgraded to a 3.5" intake that will soon expand to 4" just before the TB (to slow the air down, increasing pressure, before tapering into the throttle body).
I'd like to upgrade the intake manifold but there are fairly limited options that aren't $2k or more.
SO long story short: I'd like to temporarily pair a 74mm skunk2 TB with my stock AP1 manifold. But I have my doubts the throttle plate won't hit the AP1's 64mm intake manifold inlet. Yet Skunk2's site says their 74mm will fit the 00-05 s2000...
But this post says that a 69mm TB is the largest that can be paired to a stock AP1 manifold.
Thoughts?
#3
Once I get the TB (wednesday) I'll at least measure how wide the throttle plate is at WOT (where it'd stick out of the back of the TB) so we can get some closure on this question.
#4
The 74mm TB just wouldn't be all that useful unless the stock intake manifold were ported as large as possible (apparently 69mm).
#5
Originally Posted by snitm' timestamp='1473612675' post='24059585
Once I get the TB (wednesday) I'll at least measure how wide the throttle plate is at WOT (where it'd stick out of the back of the TB) so we can get some closure on this question.
The 74mm TB just wouldn't be all that useful unless the stock intake manifold were ported as large as possible (apparently 69mm).
#6
I'd at least take some 200 grit sandpaper and clean that up a bit. How are you planning to get the little metal shavings out of the manifold? Vaccum?
#7
With the 1st runner protruding in front of the TB and lack of space elsewhere, I may not see much airflow improvement, but throttle response should definitely be better.
As for cleanup, I used shop towels to block the plenum and runners. But shavings/metal dust was still a problem. So I used a garden hose and after that I used my kid's old little swimming pool to repeatedly dunk the entire manifold (filled with water, shook, dumped).
Amazingly, after the repeated dunking and flushing I found a piece of an old AEM AIT sensor's plastic shroud that had broken/heated off. I just assumed it went into the combustion chamber of my old motor and burned up.. turns out it somehow went in the IACV air pathway (1 in a million shot). I used tweezers to pull it out of the IACV point on the manifold.
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#8
My 70mm BDL self destructed so I enlarged the manifold and added a 74mm SkunkII.
More welding and grinding and it is ready to go. The TB needed to have the idle air passages blocked so I used JB Weld.
It works great and my last dyno was 554 rwhp and 334 torque with a few pounds of boost.
More welding and grinding and it is ready to go. The TB needed to have the idle air passages blocked so I used JB Weld.
It works great and my last dyno was 554 rwhp and 334 torque with a few pounds of boost.
#9
My 70mm BDL self destructed so I enlarged the manifold and added a 74mm SkunkII.
More welding and grinding and it is ready to go. The TB needed to have the idle air passages blocked so I used JB Weld.
It works great and my last dyno was 554 rwhp and 334 torque with a few pounds of boost.
More welding and grinding and it is ready to go. The TB needed to have the idle air passages blocked so I used JB Weld.
It works great and my last dyno was 554 rwhp and 334 torque with a few pounds of boost.
what did you use to get the IM's inlet so uniform and smooth?
Why did you feel the need to JB weld those passages? Also, looks like you blocked the passage for the MAP sensor.. odd. I didn't do any of that..
Last edited by snitm; 11-07-2016 at 10:00 AM.
#10
Originally Posted by Sideways' timestamp='1474477178' post='24066946
My 70mm BDL self destructed so I enlarged the manifold and added a 74mm SkunkII.More welding and grinding and it is ready to go. The TB needed to have the idle air passages blocked so I used JB Weld.It works great and my last dyno was 554 rwhp and 334 torque with a few pounds of boost.
I have a map sensor elsewhere. A two inch drum sander does a nice job.
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