Posts Tagged ‘Crower’

Hey guys,

I got another update from C-Tech Performance. As most of you know we have building a all motor b18a1. Basically showing everyone how to build a tuner car motor in a for a street car. Heres the update:

For your imformation / Exh. Seat pitted, left exh. Seat ground,
Head resurface 1&2. Head resurface will be included to show
difference between warp and twist. This head is twisted.

Lets start with flow bench 2, the head gets clamped to base with a tube
to match bore diameter, this imitates valve shrouding and the angle of the
air going in and out of valves. The dail indicator shows valve lift, the
clay around Int. port smooths the sharp edge of the port.

Next is Int. seat 45, Int. seat 45 & 60, Int. angles 15,45,60. This
just shows the 3 angles that smooth the transition of the air going in and
out of the head. I put black marker on last one then ground the 15 & 60
angles to better show the 45. The valves also get multi angles, the Int.
valves are already cut with a 30 backcut, but the exh. was not cut. Grinding
backcut and backcut angle show Exh. valve being ground on a 37.5 angle for
this application. You might have to zoom in to see the angle better.
Exh valve 2 seat marking shows marking where valve face and seat meet,
this mark should show all the way around valve face.

This tells you that the valve is seated and where the seat hits, the closer
to the edge the better the flow but you give up some life on the valve grind
when you run on the edge.

Checking stem height and grinding stem tip 2 is the last procedure
before assembly, The stem height is distance from spring seat to valve tip.
If the tip is to high the valve will push the follower up past the lash
adjuster range and if to short you wont have enough adjuster to take up
lash. The tip height also effects valvetrain geometry but I’ll get into that
later.

Flow numbers are as follows

Intake Exhast
Lift: 100 150 200 250 300 350 400 450 500 100 150
200 250 300 350 400 450 500
CFM@ 28in 69 105 147 166 180 194 207 218 224 62 111
127 151 164 173 175 176 178
1 angle
CFM@ 28in 76 116 159 187 194 203 213 221 225 67 99
135 161 171 176 176 176 176
3 angle

We will post numbers and pictures after revised porting and
pictures of spring set-up and valvetrain geometry.

Backcut angle
Checking stem height 2
Exh seat pitted
Exh valve 2 seat marking
Left exh. seat ground
Flow bench 2
Grinding stem tip 2
grinding backcut
Head resurface 1
head resurface 2
Int seat 45 ground
Intake Angles 15, 45, 60
Intake seat 45 & 60

This is how you build a tuner car motor the right way. Street cars take on a different type of build most of the time but we wanted to have the best possible all the way around.

Partners Include:
SuperTech Performance www.supertechperformance.com
Certified Racinghttp://www.certified-racing.com/
Crower http://www.crower.com//
Gates Racing http://www.gatesracing.com/
Cometic http://www.cometic.com/
Performance Porting http://www.performanceporting.com/
Carquest
C-tech Performance http://www.c-techperformance.com/
Ralco RZ http://www.ralcorz.com/
Aasco Flywheels http://www.aascomotorsports.com/
Exedy Racing USA http://www.exedyusa.com/
Kamikaze http://www.kamikazeperformance.com/
MSD Ignition http://www.msdignition.com/
Thermo Tec http://www.thermotec.com/
Raxles Inc. http://www.raxles.com/

If you missed the beginning of this story Project B18A1 Part 1