Thread: which head??

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ok here is the actual page to the heads I have mentioned each one has a clkickable link for the info

im looking at the pro 1 72cc heads

http://www.dartheads.com/sbchpro1.aspx

no I want whats best for my setup.. I was just posting what I read on there for u guys to help me decifer the differences

Dave

Denny,L.O.L. 230 CC, talk about poor throtle responce.You are really trying to start things now.I would run these heads if you had 434 small block and you turned to 7,500 r.p.m.s.Denny,I am glad you have a good sense of humor.

lol I saw that and my eyes about popped out of my head.. lol.. I think the 180cc or 200cc would be best.. u guys agree.. fi so which should I choose??

Dave

I think I will go the 180cc then.. this will mainly be a weekend warrior for show and crusin.. maybe on nice summer days drive to work etc.. but I would like to hit the track with it as well atleast a few times...

Dave

If I were building a naturally aspirated motor, I'd be concerned about intake runner size and matching it to the rpm range where I'd be operating the motor. With artificial aspiration where I'd have positive manifold pressure, it wouldn't matter much if I overdid the size of the intake runners. If I were going to size the housings to make boost from....say....3,000 to 7,000, I'd just use a looser torque converter and a cam and springs to allow the higher revs.

I wouldn't limit myself to a certain combustion chamber size either, because I could dial in the c.r. with the dish size in the pistons.

and to ad.. the pistons I am getting will limit me to a 72cc head in order to run 8:1 compression

I will be using SRP JE's

Dave

yeah I knew TT was better then supercharged... its funny to see he runs a water to air cooler lol....

great article thx for that....

to bad it dont help with head info lol

Dave

gottcha...now I was thinking this will prolly require injection setup instead of carbs.. regardless of head.. u agree

Dave

well it looks like the dart pro 1 180cc heads will be hard to get...

but the 200cc heads are quite available

do u think I will notice or loose a signifigant amount to matter

Dave

I think it's more than a "what head?"-question. It's also more than a "I will be using these pistons"-statement. Instead of starting off with things you want to have you should start off with the question: "what performance do I want to get out of my engine?"
What counts most is what the engine wants, not what you want. If the engine says it would prefer other pistons and would run better and faster with them, then that's the way to go. If you're planning to put twin turbos in you seem not to be very limited in terms of money. So you can get not only good stuff which has a name and sounds cool, but you can get down and look for parts that GO TOGETHER WELL. That includes things like optimizing your combustion chamber shape. Don't use pistons that mask the spark plug too much. Go for heads with little squish. Try to get a nice combustion shape when the piston is at TDC so that the flame front can run trough the chamber quickly and uniformly but not too quickly.
Remember: Heads are more than flow-numbers and port sizes. With a blower you shouldn't be too worried about port sizes, but you should always be worried about port shape, you will get the flow from the turbos. But you want swirl to get the mixture homogeneous so that it burns well. You can always build an engine with 400 HP. Everybody can do that, it's not difficult if you have the money. But with the same amount of money and parts that harmonize nicely you could get 500 HP out of the same displacement. I wouldn't necessarily stick with Dart, I would shop around a see what's best FOR YOUR ENGINE.
And for performance you won't see much difference between carb and injection as long as you don't go and dish out 2k for sequential electronic injection with loads of whatnot nobody understands. For those systems you have to be a computer expert, not an engine builder. Go with carbs, maybe dual. That would be my guess.
That's just my opinion and I'm no real judge on engine building, I'm also just getting started on the subject. But I started by reading some good books on engine building, there's quite a lot you can learn without having to make all the mistakes yourself
Hope i could help,
Max

thx max... what all heads do u guys recomend then.. the only reason I went with dart is cause a local shop around here sells them and my cost is LOW due to buying them through my work...

what other heads are good quality IYO

Dave

so in other wards... 180cc is what I shoudl aim for

Dave

well with the 180 72cc iron eagle dart head I can get (not aluminum) cost on those bar is 265.00 each.. so shoudl I just go with those.. they have heart shape combustion chambers to if that matters

ok so cast iron would'nt be bad...

now do u youirself perfer one brand head over another???

remember I am from the import world so this is all new to me...

Dave