some cool stuff here ... except for the blown motor of course. you got some stones of steel doing some of this stuff ... phuck anybody that don't like (understand) the wing ... hope you get things back together and back to the track better than ever !

You seem to have a bit of a language barrier so for that I forgive you, however just because I said it looks ridiculous doesn't mean that I don't understand why it is on there. I was just stating that it looked ridiculous. Awesome project thought. Really cool.

when I took the picture both piston were hold by the same wrist pin.
the top base of the piston looked to be the same height.

I would say the CR should remain pretty much the same as the VHR engine...
the VHR piston are more flat with 2 valve relief
the HR piston have a bit of a dome with 4 valve relief
my guesstimate would be 10.8:1
unless a known engine builder correct me on this !


http://www.the370z.com/members/megan...-0mm-stoke.jpg

http://www.the370z.com/members/megan...-hr-piston.jpg

no problem, :tup:

I just find those kind of comment a bit useless for a track car built progress

who care if it look ridiculous or too big for the car ? ,,
if you have the power its never too big !!!

as long as it work the way it is intended the rest is only a bonus.

trust me if I had some big pocket, things would be different.

Its been a while that I worked on the spare HR engine.
Anyway, today I completed the first HR head for cams clearancing
it took me a freaking long time completing one, probably 6 hours
the second one shouldnt be this long.



this picture is a bit after I started

http://www.the370z.com/members/megan...e-big-cams.jpg


once completed !
http://www.the370z.com/members/megan...e-big-cams.jpg

nice to see some progress! Thank the Lord for military leave....

Guess I know who to call when I want to build a motor. :tup:

Good job!

Did you ever do any before and after testing of your TB's? I'm curious to know how much of a difference that would make on the streets during WOT with supporting mods

Yup I have done 2 tests at 2 different occasions on a dyno.
I have a dynosheet of the last time that I tested it duing my Dyno Day test in my Picture Album
I remember that day I did test the HR intake manifold VS VHR intake manifold & Oem TB Vs my custom TB.


thanks,
the problem with this is what if I mess up your engine by mistake. ;(
This is my first time working like this on an engine
Im gonna have to see if my engine will hold or blow !!! hehe

Ok, we'll see if your engine holds before you build another. ;) :icon17:

I spend the morning doing some port match on the intake runner / lower intake manifold

With all the time spent on this , I hope the result will be worth it !!



this picture is to show the unmodified intake runner
you can also see a little bit the lower part of the intake manifold arent alligned perfectly with the actual intake runner
http://www.the370z.com/members/megan...xt-picture.jpg


do I need to explain how bad this is ?
I hope those Nissan engineer didnt do this on purpose !.
http://www.the370z.com/members/megan...not-really.jpg


after some dremel work !
http://www.the370z.com/members/megan...uch-better.jpg



This VHR intake manifold, you guys will see it back sometimes next year !
Its still under construction but not a priority right now.

I checked out your dyno sheets that you posted and you gained 7hp from just boring out your TB's correct? Or was that combined with your ported manifold? My question is what other mods did you have on the car when you had it dynoed with JUST the ported TB's. I would just like to know the gains of those without any other mods. Also, is there any better throttle response from doing that, that you have noticed? Thanks for your replies

the gain of 7-9whp is with this
Custom straight flow exhaust w/ Xpipe
PPE step header
custom CAI (similar to the stillen V3)

but it was also seen when I had the stillen shorty + test pipe over a year ago.

the gain has been seen on both intake manifold
my first attemp to port the HR manifold was only to smooth the edge of inside the intake runner when they glue the base to the intake manifold.
the VHR was modified yesterday.

as far as throttle response , my answer would be it was unchanged.

I havent done much today but I decided to go check the blown VHR head and its VVEL cams.

then the last picture show the VHR Vs HR valve spring and size.



pictures are worth a thousand words.

look at the far left VVEL cam and finger,, then compare it to the 2 others .. you will see what is missing or broken ... I couldnt find anything related to it , which mean it was totally disintegrated

http://www.the370z.com/members/megan...integrated.jpg

http://www.the370z.com/members/megan...integrated.jpg


VHR Vs HR spring & size.

http://www.the370z.com/members/megan...pring-size.jpg

ok cool! One last question I just want to make sure im clear on this. Did you dyno the car with the first 3 mods listed, get a xxx.xrwhp number and then dyno it AGAIN after you ported the TB's? Sorry for all the questions, I just want to make sure I know what you did and what agins are made with what. Thanks for the replies bud :tup: