4AGZE head skimming

[roadsailing]

stratified charge might be the way to go, but it is hardly as simple as filing a couple of grooves in your head, assuming each works i know which method i would be using!

props to you for giving this a go ben, as i said in your PF thread, keep us posted out the results!

[nick.parker]

Doesn't it have an inherent problem with the injector taking up valuable head real estate?

Some 4 stroke HPDI is done through injection ports in the cylinder wall. Orbital mainly applies Air Assisted DI to 2 -stroke engines and since two strokes _ussually_ only have a spark plug in the head its not a problem.

Nick - cool stuff, are you going to donate the hardware?

It already crossed my mind once to DI the AW11 .

Cheers, Nick

[Ben Wilson]

Some 4 stroke HPDI is done through injection ports in the cylinder wall.

Don't you fire the injector near TDC? That sounds like a bigger issue than dodging valves.

Ever thgouht about combining the spark plug and injector into one unit*?

* - No idea how this would work, but it's probably possible...

[nick.parker]

Ever thgouht about combining the spark plug and injector into one unit*?

Yep, Orbital tried once in the past..but gave up. It would be a ultimate way to go for sure, to add DI to an existing setup. I don't know all the reasons (technical) why this was abandoned.

Don't you fire the injector near TDC? That sounds like a bigger issue than dodging valves.

Well put it this way, with a 200kpA air injection pressure you can't inject whenever you want (read 'must be well before tdc on compression stroke' - as opposed massive high pressure diesel injection?) Cheers, Nick

[Ben Wilson]

Have you got any pics of the side mounted injector? I'm having trouble visualising where you would mount it without causing ring sealing issues - I suppose you could go in diagonally above the top ring but then you'd have port interference problems.

[Sam_Q]

I am really interested in this grouve theory also. Either way I cant do it to mine because a 20v blacktop has next to no squish area at all.

[roadsailing]

http://www.performanceforums.com/for...php?t=67210986

check that out, you should be able to do it on your 20 valve also, there should be some form of squish area somewhere.

[Sam_Q]

I have next to nothing, I have a pic which I will post shortly

[Sam_Q]

here you go:

[Sam_Q]

well I have been doing some reading and I have found many people have tried this and have universally had good results. Not one person so far has tried it without sucess, interesting...

[roadsailing]

sam, only place i can really see for a groove in your head is between the exhaust valves, dunno if i would be keen on putting one there though.

[Sam_Q]

no I cant say I am either.

heres some link s for people

http://forums.turbobricks.com/showthread.php?t=66779



http://mpgresearch.info/viewforum.ph...dda77f98bd7c59




http://somender-singh.com/

his main website, look in the forum for examples. I am going to ask Somender himself about my head

[jezza323]

let us know how you go Sam

[jezza323]

and a question for Ben Wilson, what did you use to cut the grooves in your head there?

[Sam_Q]

well I cant try it because I dont have any squish area. As for the groves the common concensus is that a triangular file is best. Ben I recomend widening those grooves.