In regards to flowballs, wands and strings, your going to hear a lot about them but good luck finding anyone that can tell you what they are telling you, in most cases you can not repeat the effect of the aperatous that you stick in the port. The best use I have found for flowballs is to measure chamber clearance around the valve. As shown in this thread.steve cowan wrote: ↑Thu May 03, 2018 4:42 am hi guys,
been tinkering with this cast head,thin down the guide slightly
i opened the Pinch from 0.980'' to 1.02''
MCSA was 1.91'' now 1.98'' did not factor in corner radius
IS CORNER RADIUS MEASURING IMPORTANT?????
layed down SSR approx 0.020'' and widened at the apex,
i found it difficult to get comfortable trying to shape SSR,i have a reverse cone carbide but struggled,i used a long shank cone shape bit then emery taped to try and shape a bit,practice yes i understand.any tips guys??
i still have not flowed the as cast port,have not flowed the exhaust yet either,hopefully on the weekend.
USING A FLOW WAND,piece of string on a piece of wire,i want to share my observations from today on the bench.
1/ At any depression and lift (.100'' - .650'' ) lift, string remains stable on the floor of the port over the SSR and past the valve into the chamber area.
2/ ROOF - ALL DEPRESSIONS
string is pushed towards the valve and does not go near the guide boss.
3/ MIDDLE OF PORT - ALL DEPRESSIONS,
divider wall-stable
pushrod side-stable
mid-port string bounces up-down,side to side it looks violent but it is not noisy.
NOW THE BIG ONE-
i have been having trouble keeping clay on the divider it gets sucked in,
i persevered and could get it to 15''
the software has parameters for correction of no radius,clay,inlet guide,intake manifold.
reflowed with no clay 216 cfm velocity 401 ft/sec at apex SSR
reflowed with clay at 5'',10'',15'' software corrects 232 cfm i did not check velocity,
the port sounded smoother,is this normal to gain from a clay radius ????
i retested 3 x times same result.
i am excited but curious any thoughts guys??
i sent an e-mail to jamesons equipment to see if they will send to australia i am looking for inlet radius guides,flow balls,valve opening tool,exhaust pipes.
any other companies worth checking out ?
thanks in advance for any feedback
steve c
https://www.speed-talk.com/forum/viewtopic.php?f=1&t=46308
On your clay if you roll out a log of a 1/2" or better in diameter and long enough to be bent around the port opening you can make one that can be removed and kept in tact so you can make sure it don't effect future testing. I like to keep that as consistent as possible, if I take my head to be verified by someone else I leave that intake so the test is more repeatable. Here is one of mine, it overlaps the valve cover rail to prevent it from sliding as it warms up and you can better shape it with wet fingers.