these are going on an N/A 1st gen neon from puerto rico. the head has yet to get a valve job or resurface, its going in a couple days to get them and i still need to unshroud and clean up the combo chambers. the manifold is made from a stock manifold that i modified. the owner is shooting for ~260 whp out of a 13:1 compression 2.4 bottom end. its going to be a beast. what do u guys think?

 

homeboy has got some skilz. what did the head flow on the bench

 

the last head i took to get flowbenched did 279 cfm on the intake side @ .450" of lift and the exhaust did 233 cfm at the same lift. that wasat 28" on a superflow 600 and the head had stock valves, 3 angle seats and no unshroudng work done. so im guessing with bigger valves, unshrouding of the seats, and some trick cuts (maybe full radius which this head is getting) it will get up around or over 300 cfm. removing the bosses and guides from the ports should also help that goal of mine.

 

i must say the work looks awesome!! the intake many looks very good as well, that design keeps the 1st runner from starvation. i have herd different things about knife edging the dividers on the intake side when on a N/A application, some say good and others bad.. what are your thoughts on that.. ps. im still on the learning curve here..

 

ive heard the same thing about the splitter but i dont have flow data to see if this is true or not. ive always done my splitters like that and havent had any problems yet.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by all_motor_mike &raquo;</TD></TR><TR><TD CLASS="quote">the last head i took to get flowbenched did 279 cfm on the intake side @ .450" of lift and the exhaust did 233 cfm at the same lift. that wasat 28" on a superflow 600 and the head had stock valves, 3 angle seats and no unshroudng work done. so im guessing with bigger valves, unshrouding of the seats, and some trick cuts (maybe full radius which this head is getting) it will get up around or over 300 cfm. removing the bosses and guides from the ports should also help that goal of mine.</TD></TR></TABLE>

What did it flow stock? I have never had that head on the bench so I am just curious. Those are really good numbers. I had no idea those heads flowed that well. Looking at that exhaust port I would have never guessed that.

 

i did not flow it in stock form but what ive found/ heard/ read/ the 2.0 dohc heads do around ~230 cfm on the intake and ~175 cfm on the exhaust. do the math and thats about 23% on the intake side and 33% on the exhaust side over stock specs.

 

if youd dimpled the injector slots id have said you stole those pictures from larry. beautiful work.

i think it'd be well worth your time to blend all the crap in the chamber.. definately roll the topcut into the chamber walls if nothing else. same head as the 2.4 stratus?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike_belben@yahoo.com &raquo;</TD></TR><TR><TD CLASS="quote">
i think it'd be well worth your time to blend all the crap in the chamber.. definately roll the topcut into the chamber walls if nothing else. </TD></TR></TABLE>



If you have some junk valves (or valves you dont mind turning into junk) youre already 1/2 way there...

 

and thats what im doing. i cut the valves down so they sit so low on the seat that they will not get in the way when i unshround them.

 

Man oh man would you cream yourself if you ever saw one of darrel ***'s heads. My buddy Aaron @ Real Tune Performance is running one on his 2.7L srt4. You've done a beautiful job from what I can visually compare but there are still way more tricks to be done. You should easily hit your goal of 260 whp. Guys were making about 240hp with stock cams on a 2.4L back in '02.

I'm sure you wouldn't want to hear it after all the work but the eclipse/talon head with the intake and exhaust reversed actually flows better than the neon/stratus head.

More can be removed from the exhaust splitter and if you can do it filling the dimple in the chamber is also beneficial.

Again though, nice work.

 

i used to use protector valves but found that they always got in the way of the burr and started freehanding them after the valvejob was in place. it was more nerve wracking initially but after a while became completely comfortable.

your first shot of the intake upside down shows the nice wide track youve laid in between the divider and the guide boss. i take the same approach in trying to make a cleaner path for the flow on the roof and i think you can also increase port volume without killing velocity that way. then i started trying a channel on the outside of the divider too, which ended up turning my guide bosses into a set of natural vanes. i have no data whatsoever to back any of it up.. but some prostock guys gave thumbsup to my pictures and the engines ive done it to were anythin but disappointing.
maybe something you could toy with on a flowbench and see if its worth incorporating.

 

the eclipse heads and the neon dohc heads are the same (well swapped around anyways, u know what i mean).......... i dont under stand how the eclipse head is able to make more power than the neon head. and its not an everyday thing to swap a 420a head onto a neon. maybe in a race app it will yield better results when ur up in the relly high hp ranges but for an all motor daily driver weekend warrior neon i think this head will work just fine. and i can only dream of having the equipment that DC, not to metion the backing of mopar.


Modified by all_motor_mike at 7:07 PM 2/19/2007

 

What kind of tools do you use to port with??

 

That's a great port job, I wish I could do work 1/2 that good.

 

thanks guys. i use carbide burs and cartridge rolls.

 

the work looks good. keep us posted on what the car runs

 

if a neon can do 240 on stock cams with just porting we should be swapping these things into our cars instead of k series motors, sounds alot cheaper.

 

yeah im not beleiving that one............... i just didnt say anything about it. 240 whp on a stock cammed 2.4 (he never said anything about a built bottom end) isnt happening. they have lower compression and more milder cams than the 2.0's and a lower rev range because of he 4" stroke. its a challenge getting 225 whp out of a built 2.4 motor with decently high compression (well for the average tuner). so i call BS on that comment.

 

Sorry I should have specified flywheel hp. The stock cams were the limiting factors in the set ups. They use the 2.0 head w/ 2.4 cams (same bore) Good fasteners and raised compression. I didn't see it w/ my own 2 eyes so I'm not going to put my life on it.

The guy who told me the neon info is one of the top neon builders and one hell of a tuner. His full interior 565whp street srt went 11.1 @ 132 on a very shitty track w/ 25x8 MT's w/ a 2.0 60' yet still drives like a stock-ish car w/ stg 2 turbo cams.

His goal is in the mid 800s and possibly 9s by the end of the year so I'd hope he knows what he's talking about. Especially since he is a mod on the srtforums.

 

I actually wasnt being sarcastic. But realizing later that it would be a 100hp gain i decided to recheck my post.