!KLDE head VS KLZE head!

[Mad]

May be you have already known it, but I was suprised. I checked heads on our vacuum stend for heads(it is like dyno for engines) and had surprising results!
Look:

pink - stock KLZE head
blue - stock KL head
red - improved KL head on stock valves


red - stock KLZE head
green - improved KLZE head on stock valves.

Stock kl head = Improved KLZE head on stock valves.

[maac0953]

wow thats cool man.

so you think DE oval ports flow better then ZE square ports?

and DE heads improved?????? do you mean ported and polished up a bit?


i plan on buying klg4 heads and doing my best to port& polish them for when i boost in a few months

do you think it will help me spool up quicker? it should right

[Mad]

I am sure, absolutly! DE heads are better.
De heads improved is red on 1 picture. Yes we ported and polished them, worked with edge of valves(i dont how it in english) and improved combustion chamber. I ll show improved heads photos later.
geometry of head is more important then size of intake and exhaust.

[polarexpress17]

wow man that is an awesome find!

[maac0953]

great cause ZE heads suck anyways cause they have thinner retainers and break at hi revv's. its been proved on here and my friends last 2 ze's shot valves threw the pistons.lol

iam sticking to DE's. nuts.

[valant_94gt]

very interested, i'd like to know some more in-dept info.

-v

[armydude_ehrler]

Hell ya i'd like to have get info on this.
i was just about to get a ZE.
i think i might just wait a little longer.

[Mad]

great cause ZE heads suck anyways cause they have thinner retainers and break at hi revv's. its been proved on here and my friends last 2 ze's shot valves threw the pistons.lol

iam sticking to DE's. nuts.

May be, but i never had problems with retainers. We always use custom
duralumin retainers.

What information do you need?

[jasons96pgtze]

great cause ZE heads suck anyways cause they have thinner retainers and break at hi revv's. its been proved on here and my friends last 2 ze's shot valves threw the pistons.lol

iam sticking to DE's. nuts.

Yes ze heads tend to fail because of their retainer and spring design but that issue can easily be fixed by switching to klde springs and retainers or getting interprep springs and using stock de retainers..

Now back on topic.. This is indeed interesting info and im glad you posted it up.. I have a set of de heads that i ported on the intake side to ze specs and then ported and polished on the exhaust side for my 2nd turbo engine im building.. So im glad i went with a good choice.. It just makes me wonder what allows them to flow more over the bigger port ze heads??

[641PGT]

Yes ze heads tend to fail because of their retainer and spring design but that issue can easily be fixed by switching to klde springs and retainers or getting interprep springs and using stock de retainers..

Now back on topic.. This is indeed interesting info and im glad you posted it up.. I have a set of de heads that i ported on the intake side to ze specs and then ported and polished on the exhaust side for my 2nd turbo engine im building.. So im glad i went with a good choice.. It just makes me wonder what allows them to flow more over the bigger port ze heads??

Well... I really don't know a ton about THESE engines... but I've been big into motocross my whole life, and have had many engines built... and this fact, I assume, would apply to any sort of engine. It's not always about the size of the port... When we'd have stuff ported (cylinders on two strokes and heads on four strokes), the porters would always stress that you can't just go and make the ports bigger. In some cases, they would actually make ports smaller. Don't think that bigger ports=more power. It's far more complicated than that. It's about the vacuum that the ports can pull, I think, and it's not as easy with huge ports unless the rest of the engine suits those conditions, as well. Make sense?

[jasons96pgtze]

Yes it makes sense thanks for explaining that to me.. However, i feel that my engine would make more power with ze heads over de heads because my whole engine is designed using ze parts.. In high boost applications like mine i dont see how de heads could be better than ze heads but i guess i could be wrong.. This is interesting info for sure tho..

[Tech73]

I not going to say I know anything about this but there is one thing I noticed when I had the ZE and DE heads beside each other. The intake ports where the injectors spray are different. The DE's are wider/bigger than the ZE's.

[jasons96pgtze]

I not going to say I know anything about this but there is one thing I noticed when I had the ZE and DE heads beside each other. The intake ports where the injectors spray are different. The DE's are wider/bigger than the ZE's.

Maybe this is allowing the fuel to atomize better in the combustion chamber..

[Dutchy]

*johnny depp voice* "that's interesting..."

[jestr]

ok from what i know smaller ports = more volocity= more air travel= better atomized fuel. if you want you head done right you need a flow meter and time.. i do not think forced induction really needs smaller ports it might restrict to much... keep in mind when its time to do your head have all your parts in mind maybe talk to the shop you are getting them done at for there advice. if not you might be losing to much power over all.. once you are ready to slap a motor together for what ever you want and you are commited to this type of build then get your heads done..

also i believe valve seat angle plays some into this also