16v head cfm numbers
#1
Thread Starter
Three Wheelin'
16v head cfm numbers
As i'm working on preparing the car for big hp numbers in the future, i'm wondering what the cfm numbers for the 944 are. For the 8v and the 16v head.. Anyone has those?
#2
#3
Rennlist Member
Some 928 4v numbers (Not sure how valve size compares to the 944 stuff since I know the 2v heads differed):
https://rennlist.com/forums/928-foru...tml?styleid=13
https://rennlist.com/forums/928-foru...tml?styleid=13
*Intake
LIFT______STOCK______MODIFIED
0.050"_____42cfm______53cfm
0.100"_____105cfm_____103cfm
0.200"_____187cfm_____234cfm
0.300"_____248cfm_____291cfm
0.400"_____267cfm_____342cfm
0.500"_____297cfm_____370cfm
0.600"_____306cfm_____382cfm
LIFT______STOCK______MODIFIED
0.050"_____42cfm______53cfm
0.100"_____105cfm_____103cfm
0.200"_____187cfm_____234cfm
0.300"_____248cfm_____291cfm
0.400"_____267cfm_____342cfm
0.500"_____297cfm_____370cfm
0.600"_____306cfm_____382cfm
lift intake port velocity exhaust port velocity
100 102.8 76.4 94.8 131
200 204.3 151.8 173.9 207
300 288.2 214.1 236.2 281
400 330.5 245.6 247 294
500 350.4 260.3 250 298
600 354.2 263.2 252.4 301
stock head was 274 cfm at .500
all measurements done at 28"
100 102.8 76.4 94.8 131
200 204.3 151.8 173.9 207
300 288.2 214.1 236.2 281
400 330.5 245.6 247 294
500 350.4 260.3 250 298
600 354.2 263.2 252.4 301
stock head was 274 cfm at .500
all measurements done at 28"
#5
Rainman
Rennlist Member
Rennlist Member
those 16v numbers are bonkers
#7
Rennlist Member
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#9
Rennlist Member
I'd forgotten that car. Looked very positive. Would have like to see the 100-200kmh times to perhaps equalise dyno figures. Running that hp at the wheels with stock pistons on 98 oct at 1.6bar is indeed fantastic!
#11
670WHP means 788HP in the engine. That works out to 303hp on an non turboed S2 engine. I find that VERY hard to believe. For a comparison my turboed S2 engine made 353whp at 0.8 bar and should be just over 500whp at 1.6bar. This means close to 230hp as a NA engine, which is a more reasonable number.
#13
Rennlist Member