had a play on the flow bench today

[james_c2 0]

not sure if this should be in general or engine

 

was using the flow bench today testing a couple of my heads:

 

first up standard 9a head

 

ported and polished kr head i did earler this year

 

comparison

 

these were done with the valves in so I recon the p+p worked well, especially for the inlet,going to do a bit more work on the exhaust round the throat/ were it changes direction as this is the biggest restriction in the head and i feel porting it futher could see it flowing 115-120cfm once done

 

when comparing to other results, some showing high 140s + with standard valves have been flown with valves out, as a comparison a jawa race head with 55mm ports and 35mm inlet valves flows 160cfm @ 11mm lift and type 1 race heads using 44mm inlet valve flowed 110cfm @ 10mm

 

will put some pics i took along the way when i find my phone lead

 

from what i can see as standard the head will respond alot better to longer duration, lower lift cams, i.e kr over abf, especially the exhasust as it is flowing roughly 97% its potential at 8mm lift