| Slant Six Forum https://slantsix.org/forum/ |
|
| Looking for flow numbers https://slantsix.org/forum/viewtopic.php?t=11999 |
Page 1 of 1 |
| Author: | Pacer225/6 [ Mon Feb 28, 2005 11:14 pm ] |
| Post subject: | Looking for flow numbers |
Hi. Can anyone help me? I'm looking for some Slant head flow numbers to compare with my own results that I gained from the head porting project I worked on during my Xmas holidays. I would just like to see if I'm heading in the right direction before I start playing with my next test head. Here's where I'm up to, all numbers are at 28" and with a 1.72" Chev Intake / 1.5 Chev Exhaust. Lift -----Int-------Exh --.05----29.6------25.3 --.10----60.3------54.5 --.15----94.0------77.5 --.20---116.5-----96.8 --.25---140.0----112.0 --.30---163.2----124.0 --.35---179.9----134.5 --.40---186.8----142.4 --.45---190.6----145.4 --.50---185.6----147.4 --.55----N/A------151.4 Thanks Andrew |
|
| Author: | sandy in BC [ Tue Mar 01, 2005 8:19 am ] |
| Post subject: | |
Welcome Andrew! I was hoping this info wasn t lost when the other site went down. Did you modify the combustion chamber in any way? |
|
| Author: | Pacer225 [ Tue Mar 01, 2005 8:29 pm ] |
| Post subject: | |
The only combustion chamber mod I've tried so far was this. I placed an old head gasket on the head and scribed near the intake valve. If you imagined the chamber as a clock face, the spark plug as the 12.00 o'clock position and intake valve on the left hand side, I blended from the scribe mark down to the valve seat between about the 7.30 to the 10.00 o'clock position. I felt it was worth the effort for the CFM gains made. Andrew P.S. I did make some exhaust templates but I've damaged my digital camera and I can't download the photo's it takes. |
|
| Author: | Doctor Dodge [ Wed Mar 02, 2005 8:51 pm ] |
| Post subject: | |
As a rule of thumb, I use 200 on the intakes and 150 on the exhaust side. This is based on a well ported, big valve head at 27 inches. I looks like you are pretty close to that. DD |
|
| Author: | Pacer225 [ Thu Mar 03, 2005 8:26 pm ] |
| Post subject: | |
Thanks for the reply DD. Those numbers will give me something to aim for. I did get 202 CFM out of one practice intake port but I wasn't happy with the loss of low lift flow, now that I know 200 CFM is what you would expect I'll keep working on it. What lift were you getting your numbers at? Have you noticed in the past a tendency for flow in the stock to mildly modified intake ports to quite suddenly stall in the .400" to .450" lift range? Thanks Andrew |
|
| Author: | Doctor Dodge [ Thu Mar 03, 2005 9:37 pm ] |
| Post subject: | |
.500 to .525 lift is about the max. To get good flow at those lifts you will loose some of the low end velocity. DD |
|
| Author: | Guest [ Thu Mar 03, 2005 10:17 pm ] |
| Post subject: | |
Thanks again DD Any advice regarding combustion chamber mods other than what I have already listed above? Thanks Andrew |
|
| Page 1 of 1 | All times are UTC-08:00 |
| Powered by phpBB® Forum Software © phpBB Limited https://www.phpbb.com/ |
|