How to Port and polish a 500hp Nissan SR20DET Head Part2
*****3 PARTS***** I show you a port job on a SR20DET S13 Nissan head,plus
some good infomation for you on porting these heads and on tooling tips...
Cylinder Head 105 - Valve Job Basics
Valves not sealing? Valves not bent? This is how you fix that problem.
In this video I outline the basic valve job procedure. Cleaning the
valves, cleaning the seats, cleaning the combustion chamber and lapping the
valves in to make a better seal.
Here I cover the process start-to-finish. It's the same exact process for
pretty much all non-rotary combustion engines. It takes patience and
perseverance to do this job, but anyone can do it. Reference your service
manual for measurements and service limits. Everything else that's not in
your service manual is in this video.
I apologize for not having broken busted crap to work with in this video.
It's more beneficial to all of you when bad fortune falls on me because it
gets well documented, and many people watching these videos are looking for
answers. If you have bent valves, you will discover it quickly once you
chuck one up in the drill. You'll see the face of the valve wobble around
while it spins. You'll see evidence of this damage on the valve seat. If
it's bad, you may see damage on the valve guides in the form of cracks or
missing pieces where the valve guides protrude through the head ports.
Give all that stuff a good visual inspection. ...and if you doubt yourself,
never hesitate to get a second opinion or consult a machine shop. They
will have access to expensive tools that you wont find in your average
Cylinder Head 201 - Radius Cut Valve Job
This video covers the complete valve job process that your machinist might
perform. If the 100 series videos didn't help you identify and correct a
problem with your cylinder head, then this is the next step. This video is
brought to you with permission from my machinist in full 1080HD, and covers
cleaning up the head inside and out, preparation and setting up a radius
cutter, cutting all 16 valve seats, valve grinding, and spans 3.5 hours of
actual work in under 30 minutes. There's nothing like this anywhere else
THANK YOU BALLOS PRECISION MACHINE. Thank you for the professional
explanation and execution of a job excellently-done, and un-precedented
access to your facilities.
A valve job is done by re-grinding or replacing valves, and then having new
seats cut to match the faces of the valves you're using. There are several
different machines that might be utilized to achieve this result, but the
process is the same no matter how it's done. There are seat cutters that
utilize cutting stones. There are valve seat cutters with 3 separate
angles installed 120° out-of-phase, and there are single cutters with all
3 angles (radius cutter) that cut with one blade in one pass. The machine
demonstrated here is a Sunnen VGS-20 Radius Cutter. This machine (now out
of production) produces a gradual curved seat that's superior to the shape
of a traditional 3-angle seat. While a radius cutter does contain the 30,
45 and 60 degree angles, it does so without leaving any sharp edges between
My valve selection includes Supertech 1mm oversized nitride-coated
stainless steel undercut and back-cut intake valves, and 1mm oversized
Inconel back-cut Exhaust valves.
Inconel is a high-temperature alloy utilized in marine and forced-induction
performance engines that can handle more abuse than steel can without
melting. The other characteristics of the valves which are discussed
typically yield bigger gains in airflow than simply using a bigger hole and
a bigger valve.
Why I did this to a perfectly-good cylinder head:
I changed cams. Because the valves were previously recessed during another
valve job 9 years ago, my valve installed height was increased and this
raised the operating positions of my rocker arms. My new camshaft
selection dictates using the stock valve install height. The only
solutions to this valve install height problem are to either replace the
valve seats, or install oversized valves. I opted for the latter.
UPDATE!! 1997 nissan s14 kouki sr20det build (part2) with dyno video!
*skip to 18:18 to see video of the car running
*skip to 24:53 for Dyno video
so after my last video the car ran good for about 2 weeks. long story
short, the tune that my last shop did set my motor up for detonation so
cylinder #1 dropped a significant amount of compression. the other 3 did as
well but not to such a degree.
it took me around 7-8 months to gather enough money to go with forged
internals rather than OEM.
i was on the verge of purchasing all the parts when i came across what i
thought was too good to be true.
someone in north carolina had a nice 1996 nissan 240se shell and fully
built block for sale. he was asking right around what it would of cost me
to rebuild my motor and considering i was getting a entire car and many
aftermarket parts with it, it was a no-brainer for me... I WAS SOLD!
here are SOME of the parts included with the 1996 240 shell:
-Freddy intake manifold/$140
FULLY ASSEMBLED BLOCK (BLUEPRINTED AND RACE BALANCED)
-9:1 forged cp pistons $470
-Brian crower 1200hp "I beam extreme" 19mm GT-R +625 ARP hardware/ $630
-ACL race rod and main bearings /$121.60
-nissan thrust washer /$12
-B&M short shifter/$200
-Megan turbo elbow/$55
-stock inj w/ fuel rail/$80
-Intercooler and piping/$140
-t25 stock turbo/$100
-sr20 stock maf/$45
-sr20det stock oil pan/$30
-winning specialties harness/$200
-stance rear upper control arms
-stance coilovers/ $1000
-greddy blow off valve
-turbosmart Boost controller
and some other stuff..
picked it all up and the rest was history.
car made some healthy numbers after everything was dialed in, the head will
get built next and them I'm gonna be going for 450hp so subscribe for
hope you enjoyed and thanks for watching
Dyno tuned by rolo at
CFT turbo in orlando
Cutting and Grinding Valve Seats
Anthony & Raj @ DIYautotech taking you through the steps on the Rotler SG-8
on how to properly cut valve seats on your cylinder heads.
If you have any questions or concerns, please leave a comment below.
We'll see you next time!
Nissan SR20-DET Block Resurfacing
John Edwards discusses some of the reasons why aluminum blocks require
resurfacing and how it's done on the Sunnen HBS-1300 @ Costa Mesa R&D
Automotive Machine 949.631.6376
Chevy LT-1 Cylinder Head Full Porting Stage IV
This is the full blown Stage IV Max Street porting of the LT-1 Cross-Flow
Cylinder Head. Part One....In this we cover the begining to end of
unshrouding and polishing the combustion chambers. Thanks to Tom Kish for
the use of his heads and the extra time he allowed for me to film and
perform these mods, and his permission to display his heads and work
performed. This procedure removed 3cc of material, and blended the chambers
to discourage detonation. This is part one of three of mods to turn a
stock 170cc LT-1 heads into Edelbrock, AFR killers. The valve size remains
the stock 1.94 and 1.50 sizes. To follow more go to www.headbytes.com