Jump to content
HybridZ

My official L31DETT RHD thread.


Recommended Posts

  • Replies 473
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Popular Posts

Ok, so look here for updates every couple days As Ill just keep adding to this thread for my updates of my progress on the L31DETT RHD car. I got the intercooler installed, as well as the alluminum r

There is ALOT of cost in time that has gone into this project. Over 500 Man hours Between my father and I for sure. We have been doing LOTS of calculations, trial and error, quality controll, etc.

testing at 28" sucks more!!!!!:mrgreen:

 

its a difference of pressure, 28" is a full atmosphere or ~14 PSI IIRC.. 25" is a bit less.

 

i can see there being more pressure, wont that skew the results? it seems that would be like comparing apples to oranges if the #'s are skewed.

 

jimbo

 

Comparing flow bench numbers for two different heads is comparing apples to oranges. Comparing flow bench numbers from the same head on two BENCHES is comparing apples to oranges.

 

Flow benches are tools to use in determining the difference made in machine work on one head.

 

Take head, flow test it, work on it, flow test it again to see if you helped or hurt performance.

 

Comparing flow test numbers is sketchy to say the least; it is ONE very loose specification on a very complex piece of equipment (the cylinder head.)

Link to post
Share on other sites

28" H20 = 1.0106 psi

 

1 atmosphere = ~407.2" H20 = 14.7 psi = 29.92" Hg (Mercury)

 

So I assume they're talking about gage pressure (pressure above / below atmospheric) versus absolute pressure.

 

Some trivia: If you had a vacuum on the top of a column of water in a tube, you could only "suck" the water high enough to get a column ~407" high. This is why we put well pumps at the bottom of the well versus the top. Even if you had an infinitely strong pump, you can't raise (suck) the water above 34 feet since you cannot get a pressure below a complete vacuum.

 

 

-Hugh

Link to post
Share on other sites
testing at 28" sucks more!!!!!:mrgreen:

 

its a difference of pressure, 28" is a full atmosphere or ~14 PSI IIRC.. 25" is a bit less.

 

 

 

Comparing flow bench numbers for two different heads is comparing apples to oranges. Comparing flow bench numbers from the same head on two BENCHES is comparing apples to oranges.

 

Flow benches are tools to use in determining the difference made in machine work on one head.

 

Take head, flow test it, work on it, flow test it again to see if you helped or hurt performance.

 

Comparing flow test numbers is sketchy to say the least; it is ONE very loose specification on a very complex piece of equipment (the cylinder head.)

 

 

Why do you think I compared a P90 to a KA head on MY bench, SAME bench.

Link to post
Share on other sites

wow Ive been out of the loop for a while and I am utterly amazed. It looked sketchy from the early shots, but this is undeniable proof that careful and extensive calculations can make the impossible possible. as a student in mechanical engineering, I aspire to accomplish a feat of this magnitude, and you have proven yourself (at least in my eyes) to be included in the permanent history of the Z car.

 

PS: was the head made from 2 KA heads, the ends of one and the center of another? or was is it the same end from 2 heads and the center from another???

Link to post
Share on other sites
Go read what these smart guys are saying. I love how they can critisize when they know NOTHING about internal combustion engines!

 

 

As someone said on there,

 

"I would of welded up the headbolt holes"

 

 

Holy geeze.

 

http://www.genmay.com/showthread.php?t=754004

 

...and when you dyno it, they'll say you fudged the dyno calibration to make it read an extra 300hp.

...Ask me how I know:mad::mad::mad::mad:

Link to post
Share on other sites

My gawd, my pc has been OFF for 1 whole week and now he's gonna be on TV?!?! I picked a bad week to start a new job!

 

Congrats. And these guys calling the project ghetto don't know what in the world they're talking about. Apparently anything they don't think will work is deemed ghetto it seems. I bet they would have called the moon landing ghetto...

Link to post
Share on other sites

Ok, I just got home. I got 1300 miles of driving with the car, then it breaks down 5 miles from my house, GRRRRRRRRRRRRRR. After lots of testing, it turns out the DB37 connector fell off the Megasquirt, AHHHHHHHHHHHH. But it ran perfect, just perfect. I have an oil leak, out the valve cover gasket, and out of the front turbo, but other than that perfect. I didnt loose a DROP of water. The show was a blast, I sorta lost count on how many Magazene articles took a story on it, I had a blast. Although I didnt get to walk around the jccs show at all. I raced a couple cars on the way home, which one was a souped up LS400, that thought he was fast, yea no competition. HAHA. I had it to about 145 in 5th gear, pulls pretty hard. Although the wastegate cant pull enough pressure off of the hot side of the turbos as the boost creeps in high gear.

Link to post
Share on other sites

I was suprised not to see you at the show John C. Jeff Priddy called me abount noon and said he was trying his best to get off of work, but didnt get a chance to. I was manily impressed about the no water leaks, as that was the main concern with this project. There is no oil in the head except for the first two inches from the front. My electric fan pretty much cant flow enough air for 100 degree heat in traffic backups, as the temp guage starts creaping after about 20 minutes of just sitting there and barely moving, so I will add a pusher also. Valve cover gasket is a oring.

Link to post
Share on other sites

×
×
  • Create New...