- Joined
- Dec 25, 2002
- Location
- mont, AL
So mine reads low apparently, but this is awful.
Got a 91 530 casting, T cam'd head from the junkyard a couple weeks ago to play around with and see what I could learn. Maybe do some cheap light/moderately ported and balanced heads, nothing too fancy.
Last night I finally got around to base-lining the thing. Its awful, but the news isn't all that bad.
For the sake of comparison, a stock 16v flows out at between 190 and 200 on the intake side (I can't remember what it does on the exhaust side, 170 or so? it blows a little better than it sucks, generally)
with no cam, and me plunging the intake valve open ~an inch, maybe more, it maxed out at 135 cfm @ 28. eeek. Exhaust was about 105 @ 28 blowing out.
So, I tossed the T cam in, to see what things would look like. it was a pleasant surprise (I guess...), but don't read too much into this..
130 @ 28 at max lift on the intake side T cam
95 @ 28 at max lift on the exhaust side T cam
All numbers @ 28
Results so far:
Intake
lift Ported Stock %diff
.050 34 30 +13.3
.100 62 56 +10.7
.150 90 82 +9.7
.200 111 101 +9.9
.250 127 118 +7.6
.300 140 125 +12
.350 145 122 +18.8
.400 148 123 +20.3
.450 153 123 +24.4
.500 159 124 +28.2
Exhaust:
lift Ported Stock %diff
.050 28 22 +27%
.100 46 38 +21
.150 62 55 +12.7
.200 78 70 +11.4
.250 90 80 +12.5
.300 99 90 +10
.350 105 93 +12.9
.400 109 100 +9
.450 114 102 +11.7
.500 117 106 +10.3
Whenever I swap 16v heads, I'll try and make it a point to toss it on there with stock cams and the solid lifters to see what it'll do with the stock profiles and perhaps the hotrod cams that i've got as well. Couldn't really figure out the best place to put this, its not exactly performance (yet), and I didn't take any pictures, so it doesn't exactly go in showroom, so OT it is..
Got a 91 530 casting, T cam'd head from the junkyard a couple weeks ago to play around with and see what I could learn. Maybe do some cheap light/moderately ported and balanced heads, nothing too fancy.
Last night I finally got around to base-lining the thing. Its awful, but the news isn't all that bad.
For the sake of comparison, a stock 16v flows out at between 190 and 200 on the intake side (I can't remember what it does on the exhaust side, 170 or so? it blows a little better than it sucks, generally)
with no cam, and me plunging the intake valve open ~an inch, maybe more, it maxed out at 135 cfm @ 28. eeek. Exhaust was about 105 @ 28 blowing out.
So, I tossed the T cam in, to see what things would look like. it was a pleasant surprise (I guess...), but don't read too much into this..
130 @ 28 at max lift on the intake side T cam
95 @ 28 at max lift on the exhaust side T cam
All numbers @ 28
Results so far:
Intake
lift Ported Stock %diff
.050 34 30 +13.3
.100 62 56 +10.7
.150 90 82 +9.7
.200 111 101 +9.9
.250 127 118 +7.6
.300 140 125 +12
.350 145 122 +18.8
.400 148 123 +20.3
.450 153 123 +24.4
.500 159 124 +28.2
Exhaust:
lift Ported Stock %diff
.050 28 22 +27%
.100 46 38 +21
.150 62 55 +12.7
.200 78 70 +11.4
.250 90 80 +12.5
.300 99 90 +10
.350 105 93 +12.9
.400 109 100 +9
.450 114 102 +11.7
.500 117 106 +10.3
Whenever I swap 16v heads, I'll try and make it a point to toss it on there with stock cams and the solid lifters to see what it'll do with the stock profiles and perhaps the hotrod cams that i've got as well. Couldn't really figure out the best place to put this, its not exactly performance (yet), and I didn't take any pictures, so it doesn't exactly go in showroom, so OT it is..
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