Jump to content

Stahl Header Vs. Tii Manifold Response


jgerock

Recommended Posts

There have been multiple inquiries on the subject of whether or not adding a header will improve performance of an M10 engine - especially when compared to a ti/tii cast iron manifold.  Certain older Roundel magazines have included comparisons and opinions.   Here is the response from Jere Stahl in the January 1990 Roundel.

 

StahlletterJan1990_zps5d8faef2.jpg

 

Stahlletterpg61Jan90_zpsdf658fa9.jpg

 

Stahlletterpg62Jan90_zps2a250ad0.jpg

Link to comment
Share on other sites

I think you would be better off with the 1 3/8" header with that little cam and small carbs.  You might loose a few HP at the top end but you will gain a lot in torque in the mid range.  Looks at the torque figures and where it peaks between the 1 3/8 and 1 1/2 headers on the Tii.  The smaller header is a much better compromise for a street car. 

 

Look at the AVERAGE torque through an RPM range:

1 1/2"  header  2000-5000 rpm 115.8 lb/ft average

1 3/8"  header  2000-5000 rpm 124.2 lb/ft average 

1 1/2"  header  2000-6500 rpm 99.15 lb/ft average

1 3/8"  header  2000-6500 rpm 116.2 lb/ft average

 

You need to move a LOT more air to make the larger header pay off. 

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • Upcoming Events

×
×
  • Create New...