|
04-02-2010, 08:44 PM
|
#1 |
|
Senior Member
Join Date: Jul 2009
Location: goose creek sc
Posts: 818
|
ported heads technical question
has anyone installed ported heads, especially ones with oversized valves, noticed a decrease in engine vacuum at idle? if yes how much? thanks
__________________
  02 lightning all stock 99 mustang gt Tork Tech terminator kit making a little boost |
|
|
|
04-02-2010, 08:47 PM
|
#2 |
|
Neo is Jesus
Join Date: Jan 2007
Posts: 13,265
|
Where more aggressive cams used also?
__________________
Gap A Hoe Racing
 |
|
|
|
|
04-02-2010, 10:16 PM
|
#3 |
|
Senior Member
Join Date: Jul 2009
Location: goose creek sc
Posts: 818
|
well, i had stage 2 patriot performance heads and i upgraded to stage 3 heads with larger valves and more porting. i used the same cams in both but i have lost about 8 in of vacuum. i do have a more efficient intake manifold also with a slightly larger supercharger. i upgraded from an m90 to an m112. the low vacuum is giving me a rough idle. i suspect the heads are at least helping with the loss.
__________________
02 lightning all stock 99 mustang gt Tork Tech terminator kit making a little boost |
|
|
|
|
04-03-2010, 09:23 AM
|
#4 |
|
Senior Member
Join Date: Jul 2009
Location: goose creek sc
Posts: 818
|
they are cms (vt) stage 2 blower cams so the are a little aggressive
__________________
02 lightning all stock 99 mustang gt Tork Tech terminator kit making a little boost |
|
|
|
 |
| Thread Tools | |
| Display Modes | |
|
|
Linear Mode
