has anyone ever welded the combustion chambers for a flush quench pad? i know you would have to mill the pistons to account for clearance, but it seems easy enough.

thought, comments, questions, EXPERIENCE??

 

shaving the pistons after increasing the quench pads on the head would defeat the purpose of welding up the CC.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedra500 &raquo;</TD></TR><TR><TD CLASS="quote">shaving the pistons after increasing the quench pads on the head would defeat the purpose of welding up the CC.</TD></TR></TABLE>

why do you say that. isnt the purpose of the flat quench area to redirect the mixture back down and to the center of the cylinder? so why would giving a head quench when it doesnt really have any defeat the purpose? you dont see B18 heads recessed.

P.S. ive got a used water pump $10 + shipping, PM for pics

 

already got a pump, but thanks. Yes you are correct that the purpose of the quench pads are to spin the air back towards the center of the combustion chamber to promote fuel atomization however if you shave the piston you still have the same amount of room between the quench pad and piston as you did before, so it really would change the flow inside the CC. However decreasing that clearance so that you have minimal clearance between the piston and the quench pad would give you that change. I say go for it, I would start off by claying your motor to check your factory clearance. Then check and see what kind of feasible numbers you could run. I would recommend some stronger the clearances get tight. Also decide on what rpm range you will be revving to so you can make sure you account for rod stretch at that point. Let us know if you decide to do it, I would like to see the results.

 

Here was one that JG Engine Dynamics did for one of my H22 heads. I have a new head being done by Alaniz also with welded chambers. Ill post results when everything is put together and on the dyno....

 

and the point in this is to allow for a higher compression rate since the floor of the piston is now closer to the quench area?

 

compression isnt really the goal. but creating a turbulent, well distributed mixture close to the center of the bore. when you add material to the head, you have to take material away from the piston, or lower the compression height.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotorRandy &raquo;</TD></TR><TR><TD CLASS="quote"> Here was one that JG Engine Dynamics did for one of my H22 heads. I have a new head being done by Alaniz also with welded chambers. Ill post results when everything is put together and on the dyno....

</TD></TR></TABLE>

awesome, perfect example. please let me know how it turns out for you.

 

Randy,

any reason why you chose to use standard faced intake valves and flat faced exhaust valves?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bluedlude &raquo;</TD></TR><TR><TD CLASS="quote">compression isnt really the goal. but creating a turbulent, well distributed mixture close to the center of the bore. when you add material to the head, you have to take material away from the piston, or lower the compression height.

awesome, perfect example. please let me know how it turns out for you.</TD></TR></TABLE>

In my case i think compression was the goal. I've always thought that welding the combustion chambers will decrease the chamber volume cc's in turn increasing the compression ratio. the piston im using is pretty aggressive too....




These are going to be finished up by Alaniz as well....

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">Randy,

any reason why you chose to use standard faced intake valves and flat faced exhaust valves?
</TD></TR></TABLE>

Not sure why JG decided to do that but the is long gone now and Alaniz is going to be working with us to get the right head for our race program

 

damn wild pistons there. what compression will that setup put you at? any special crank rod combo? sorry you got me interested.

i dont remember where i read that dished valves help pull the intake charge into the cylinder?

 

All I can do is link, the pictures are to big to just post in the thread.

http://mlbz521.scorchgaming.co...5.jpg
http://mlbz521.scorchgaming.co...3.jpg

 

are you running that head right now?

 

Nope, it's sitting right now..
I need a shell to drop the engine into, but I don't have the room keep it.. Four roommates besides myself and four cars at our house.. Unless I kept it in the back yard... Heh, That and I don't have the money for everything to finish it and to get it tuned right now.. So it's just waiting.. Depressing...

 

That head looks nice, but those are pretty extreme looking pistons. What CR are they supposed to be rated at with a stock head? Is there any reason you chose such an extremely high static CR rather than achieving the same dynamically?

 

low duration cams dont make as good of power at high RPMs. and that the only way to iincrease dynamic compression.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MLBZ521 &raquo;</TD></TR><TR><TD CLASS="quote">Nope, it's sitting right now..
I need a shell to drop the engine into, but I don't have the room keep it.. Four roommates besides myself and four cars at our house.. Unless I kept it in the back yard... Heh, That and I don't have the money for everything to finish it and to get it tuned right now.. So it's just waiting.. Depressing... </TD></TR></TABLE>

I feel your pain. money is such a big problem.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec4max &raquo;</TD></TR><TR><TD CLASS="quote">

I feel your pain. money is such a big problem.</TD></TR></TABLE>

we are all in the same boat, hence my slow build in the sig

 

^^Yea.... Who needs money anyways...

Here's some more depressing images..

http://mlbz521.scorchgaming.co...5.jpg
http://mlbz521.scorchgaming.co...4.jpg

What a tease..

 

When money is the problem, Milling is the solution




Modified by H2D at 11:34 AM 8/18/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotorRandy &raquo;</TD></TR><TR><TD CLASS="quote"> Here was one that JG Engine Dynamics did for one of my H22 heads. I have a new head being done by Alaniz also with welded chambers. Ill post results when everything is put together and on the dyno.... </TD></TR></TABLE>


Hey Randy do you have a write up of your build?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Aaron.Hillman &raquo;</TD></TR><TR><TD CLASS="quote">When money is the problem, Milling is the solution




Modified by H2D at 11:34 AM 8/18/2007</TD></TR></TABLE>

...... get ready for some cam degreeing on that mug!!!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Aaron.Hillman &raquo;</TD></TR><TR><TD CLASS="quote">


Hey Randy do you have a write up of your build?</TD></TR></TABLE>

I dont really plan on doing one..... I was just planning on posting up my dyno plot and let people speculate....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotorRandy &raquo;</TD></TR><TR><TD CLASS="quote">

...... get ready for some cam degreeing on that mug!!! </TD></TR></TABLE>

That is no problem, I degree the cams on all my builds, on the car or on the stand doesn't matter.

I usually don't butch a head like that. That was an experiment that really worked.





<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">I dont really plan on doing one..... I was just planning on posting up my dyno plot and let people speculate.... </TD></TR></TABLE>

How much HP are you expecting and how much C/R is on it?




Modified by Aaron.Hillman at 1:06 PM 8/18/2007

 

I dont really like predicting my WHP #'s. I just let the dyno do the talking.... as far as CR's go .... i should be in the 14:1 range.

 

Pirate's combustion chambers had nice quench after recessing them to clear the pistons sticking out of the deck: