3216090 Cylinder head flow and volume numbers

[jeepsr4ever]

We flowed a set of stock 3216090 single rocker dogleg heads and got these numbers

Cylinder head chamber volume 59.8cc
Intake valve 2.025 (stock)
Exhaust valve 1.68 (stocK)

Lift/Intake/Exhaust
.200 139 110
.300 184 134
.350 199 146
.400 207 148
.450 213 149
.500 217 152
.550 219 154
.600 221 155
.650 222 154

Heads were boiled and blasted before flowing

[Goose]

Hmm, those numbers would indicate that going much beyond .550 lift is a losing game..(spring bind , keeper issues etc) with a very small increase in flow. with stock heads anyway. :-|

[82Waggy]

Flowed with or without intake fairing and exhaust stub?

[tufcj]

Are these the ones that you are planning on CNC porting?

Bob
tufcj

[1980_Cj7]

59.8cc? Is that stock or did you open up the heads some? I've been using 58cc for our stock 6090 heads in running compression ratio figures to try to determine what we'll end up with. If they truly are 59.8, that will help us a little in keeping the CR workable with pump gas.

[Blown7]

59.8cc? Is that stock or did you open up the heads some? I've been using 58cc for our stock 6090 heads in running compression ratio figures to try to determine what we'll end up with. If they truly are 59.8, that will help us a little in keeping the CR workable with pump gas.

While you have the engine apart, CC your heads so you won't have to guess.

Jeff

[1980_Cj7]

59.8cc? Is that stock or did you open up the heads some? I've been using 58cc for our stock 6090 heads in running compression ratio figures to try to determine what we'll end up with. If they truly are 59.8, that will help us a little in keeping the CR workable with pump gas.

While you have the engine apart, CC your heads so you won't have to guess.

Jeff

Jeff, how do you do that? Can I just fill the combustion chambers with water and measure how much they hold? I have some 60cc hypodermic syringes, I could fill the heads from them and get a fairly accurate measurement. And no, I don't have a serious habit, ha, ha, they are from giving my horses injections. Or, is there a better way?

I keep reading about opening up heads, unshrouding valves, etc. Is this something we could try at home with a die grinder and Dremel tool, or are much more sophisticated methods required.

[Blown7]

59.8cc? Is that stock or did you open up the heads some? I've been using 58cc for our stock 6090 heads in running compression ratio figures to try to determine what we'll end up with. If they truly are 59.8, that will help us a little in keeping the CR workable with pump gas.

While you have the engine apart, CC your heads so you won't have to guess.

Jeff

Jeff, how do you do that? Can I just fill the combustion chambers with water and measure how much they hold?

No surface tension will give you a bad reading. Best way is to tip the head at about a 20-30 angle so the top of one the edges of the combustion chamber is the highest. Cut a piece of plexiglass bigger than the combustion chamber with a 3/16 dia hole at the top of the cumbustion chamber. Use Vasoline to stick the Plexi to the head around the chamber, (push down hard to "wring", make sure the Vasoline does not get into the chamber (reduces the CC reading) Fill the chamber with Denatured Alcohol from a graduated (whats the name of that long thing??????? with a valve??) can't ever remember it even though I own one??? Anyway fill to even with the bottom of the Plexi slow (sometimes you gotta rock the head to get all the air out) if your Vasoline seal doesn't hold, clean and try again
Read your measurements.
This is a simplified version it can be aggrevating just takes time
It's best to have someone show you the first time.

I have some 60cc hypodermic syringes, I could fill the heads from them and get a fairly accurate measurement. And no, I don't have a serious habit, ha, ha, they are from giving my horses injections. Or, is there a better way?

I keep reading about opening up heads, unshrouding valves, etc. Is this something we could try at home with a die grinder and Dremel tool, or are much more sophisticated methods
required.

You could port match, but the other things need to be controled and you could very well do more damge than good.