so i ported a 1g head and got it flow benched.......

[all_motor_mike]

i think the numbers were alright for this being the first time for one of these heads. theres still more to get out of it thats for sure. this head had 1mm o/s valves in it and a 3 angle valve job on both sides. but for some reason the exhaust side was cut with stones???? (my boss had his buddy do it) anyways the next one i got lined up will have a different valve job done by my guys and the throats actually opened up some to take advantage of the o/s valves it will be getting and a little more porting and then hopefully i will be seeing some numbers above 280-285 on the intake and closer to 250 cfm on the exhaust. heres the numbers for this head along with the pics...................


what u guys think?


intake

.100"- 87.05
.200"- 168.94
.300"- 229.99
.400"- 256.63
.500"- 269.80


exhaust

.100"- 78.05
.200"- 166.19
.300"- 207.69
.400"- 227.01
.500"- 239.08

heres the intake............

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AMM

 

[all_motor_mike]

heres the exhaust..........

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AMM

 

[cruisintalonawd]

Thats pretty good

 

[spooled_u_1st]

Looking good in there.

 

[CanadianTSi]

I never understood why they flowbench our heads to .500 lift...How many DSM Cams do you see with .500 lift?

 

[all_motor_mike]

I never understood why they flowbench our heads to .500 lift...How many DSM Cams do you see with .500 lift?

cant say ive seen any dsm's go that high with lift and for that matter any other sport compact cars........ ok maybe some all motor hondas but thats about it i think. anyways u got it on the flow bench why not take an extra couple of seconds to see how the head will flow all the way to .500". actually in some cases u might not even make it to .500" before flow starts falling off. when i post the next numbers where would you like my max lift number to stop at?


AMM

 

[tqmx1]

The only way you will know how good a job you did is flow bench a stock head. A friend has a machine shop (with flow bench) and does all sorts of hardley heads. and every once and awaile gets a set in feom a so called expert porter. When the head is put on the bench it flows less than a stocker!! And then you should see all the after they spent the big $$$ and now they have to pay him bigger $$$ to fix it.

How many inches of 02 were they using on the bench?

 

[alex99gst]

This thread could be a good bit of information too.

http://www.dsmtuners.com/forums/art...1g-head-flow-numbers-intake-designs-long.html

 

[all_motor_mike]

This thread could be a good bit of information too.

http://www.dsmtuners.com/forums/art...1g-head-flow-numbers-intake-designs-long.html

that polk guy flowed a completly stock head and got 280 cfm.......... thats weird cause i was under the impression that a good flowing 1g head would be in the area of 280 cfm on the intake and im not sure about the exhaust. the head was flowed at 28" h20 on a super flow 600. i do indeed need to take a head in and get it flow benched in completly stock form so i can see what it does on the superflow............. im really not worried about the numbers and how they compare to others flow benched numbers but i do want to know what percentage of flow that this head and others that i do will have over a stock head. (on the same bench of course)


AMM

 

[turboglenn]

I'm sure everyone is well aware taht max flow does not equal max power. A good head porting guy will balance flow against velocity. I know a guy who "thought" he was a great DSM builder and teh head he ported for my friend caused his 14b to not spool to well over 4k RPM's because he just hogged everything out as big as he could get it. Needless to say my buddy was pissed and had to buy a new head.

Anyway, your port job looks very nice nad well thought out. I wasn't putting that out there to rag on anyone, but some people just think bigger is better when actually it's not. Ina lot of street bike road race motors they actually shrink the ports to gain power over the entire power range by increasing velocity

here's some great reading on porting and making power. Of course they are street ike engines but ours aren't to far off from them being DOHC inline 4's
Homework

 

[99gst_racer]

all_motor_mike - Do you have any "before" flow numbers to use as a reference of your labor? Porting looks nice, BTW.

 

[all_motor_mike]

all_motor_mike - Do you have any "before" flow numbers to use as a reference of your labor? Posting looks nice, BTW.

thanks........ and no i do not have before flow numbers but im going to take another 1g head in next week and have it flowed so i know what my gain is over the stock head. as long as i see a good gain then i will be happy.......... even if the super flow that mine are done on are reading a lot lower than some of the other guys 's benches out there.

and glenn back in the day i too thought that hogging a port out was the way to go and then i started doing it myself and reseaching things and now i know the do's and donts and i very much agree with what u said. i still wouldnt use jb weld in my ports though


AMM

 

[turboglenn]

Yea, im not too fond of JB weld in my intake either

Of course there's a few road race guys i knwo that have 2-3 seasons on their heads and there's been no signs of it coming loose. One of them is an R6 that is a daily rider and track bike. I've gotten to ride it on several occasions and it's definately more powerfull through out the RPM band than any other R6 i've ridden.

 

[groundPork]

Yea, im not too fond of JB weld in my intake either

Of course there's a few road race guys i knwo that have 2-3 seasons on their heads and there's been no signs of it coming loose. One of them is an R6 that is a daily rider and track bike. I've gotten to ride it on several occasions and it's definately more powerfull through out the RPM band than any other R6 i've ridden.

Actually epoxy in the intake ports is an old head porter's method, that i have personally seen hang on from Big block Chevy Pro Stock heads from way back. It will hold if the prep and cure was done correct. and it works. Good point to bring up Glenn.

On that note, i think our ports are too big for most real street use,and explains the not so bonerfied peak numbers. the key is bringin up the low lift numbers. and I can tell that whomever did motor mikes head work is very experienced and very skilled. albeit conservative... as mentioned earlier, the bowls, and throats should be opened to take advantage of the larger valves. but lets be honest who ever got twenty horses (proven on the dyno) on a 4G from porting the head alone? You should be proud Mike.

 

[all_motor_mike]

Actually epoxy in the intake ports is an old head porter's method, that i have personally seen hang on from Big block Chevy Pro Stock heads from way back. It will hold if the prep and cure was done correct. and it works. Good point to bring up Glenn.

On that note, i think our ports are too big for most real street use,and explains the not so bonerfied peak numbers. the key is bringin up the low lift numbers. and I can tell that whomever did motor mikes head work is very experienced and very skilled. albeit conservative... as mentioned earlier, the bowls, and throats should be opened to take advantage of the larger valves. but lets be honest who ever got twenty horses (proven on the dyno) on a 4G from porting the head alone? You should be proud Mike.

i did the porting sir, thanks


AMM

 

[highpsi93tsi]

Shep uses epoxy in his exhaust ports, he has them upside down D shaped as the exhaust hits the turbine better and more efficiently. Same concept as to why people use 2G heads for their straight angle intake port design.

 

[95blackGsTurbo]

Very nice Mike. Gonna have to bring my head to you when I get it back from being decked. And I will utilize that .500" lift section . Well close with the 288's.

 

[all_motor_mike]

Very nice Mike. Gonna have to bring my head to you when I get it back from being decked. And I will utilize that .500" lift section . Well close with the 288's.

sweet, im always up for an offer like that.

 

[SBR Joe]

That port work looks excellent. The numbers you got are about the same as mine.


Joe

 

[all_motor_mike]

why thank you, im assuming SBR did your head joe?


mike

 

[SBR Joe]

why thank you, im assuming SBR did your head joe?


mike

no, it was actually the one that i did when i was flow bench testing it in school. It was my first one and i was basically interested in seeing where the gains came from and how much i saw. I tested mine at .300, .350, and .400 lift because i figured id never go bigger that a 272. Looks great though!



Joe