Cylinder heads

Elmo370z · 07-16-2018, 09:07 PM

Anyone have any info about knife edging the intake side of the heads.

Jhill · 07-16-2018, 10:20 PM

I’ve never even heard of that on any car. You don’t mean knife edging the crank?

Elmo370z · 07-17-2018, 12:28 AM

Quote:

Originally Posted by Jhill

I’ve never even heard of that on any car. You don’t mean knife edging the crank?

No the heads

BGTV8 · 07-17-2018, 06:11 AM

Done on oldschool heads with siamiesed inlets.

I ran a 1964 EH Holden in Historic Touring cars 15-20 year ago and this was a 3-litre striaght 6 with a 9-port head. The inlets were siamesed so you have 3 inlet openings feeding 6 cylinders and 6 individual exhaust ports ... and the inlets were knifed edged to get flow separation into each of the inlet valves.

All ports on the same side of the head and the ports went
1 exhaust
1 and 2 inlet
2 exhaust
2 and 3 inlet
3 exhaust
etc etc

Very old-skool !!

Only useful knowledge for old f4rts

That said, VQ engines are 4-valve and knife edging the port separator on the inlets could conceivably give benefit to an all-motor/NA build ....

zer099 · 07-17-2018, 11:13 AM

I'd be surprised if someone has. What I have learned just trying to get people to touch our heads and do a valve job is difficult because they are all afraid of the VVEL ladder. Doesn't head the FSM has do not touch written all over it.

BGTV8 · 07-19-2018, 02:21 AM

Is good if you have the VVEL delete option though

Elmo370z · 07-19-2018, 02:37 AM

Quote:

Originally Posted by BGTV8

Is good if you have the VVEL delete option though

Hate the vvel.

Elmo370z · 07-19-2018, 02:46 AM

Quote:

Originally Posted by zer099

I'd be surprised if someone has. What I have learned just trying to get people to touch our heads and do a valve job is difficult because they are all afraid of the VVEL ladder. Doesn't head the FSM has do not touch written all over it.

A good shop can do the work

07-16-2018, 09:07 PM	#1 (permalink)
Elmo370z A True Z Fanatic Join Date: Apr 2013 Location: st. petersburg Posts: 5,709 Drives: 09 nissan 370z Sp M6 Rep Power: 295378	Cylinder heads Anyone have any info about knife edging the intake side of the heads.

07-17-2018, 06:11 AM	#4 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,514 Drives: 09 Nissan 370Z M6 Rep Power: 39973	Done on oldschool heads with siamiesed inlets. I ran a 1964 EH Holden in Historic Touring cars 15-20 year ago and this was a 3-litre striaght 6 with a 9-port head. The inlets were siamesed so you have 3 inlet openings feeding 6 cylinders and 6 individual exhaust ports ... and the inlets were knifed edged to get flow separation into each of the inlet valves. All ports on the same side of the head and the ports went 1 exhaust 1 and 2 inlet 2 exhaust 2 and 3 inlet 3 exhaust etc etc Very old-skool !! Only useful knowledge for old f4rts That said, VQ engines are 4-valve and knife edging the port separator on the inlets could conceivably give benefit to an all-motor/NA build .... Rusty and Elmo370z like this. Last edited by BGTV8; 07-18-2018 at 04:59 AM. Reason: Add smart-arsed comment

07-17-2018, 11:13 AM	#5 (permalink)
zer099 Base Member Join Date: Oct 2015 Location: Dawsonville, GA Posts: 88 Drives: '98 200sx; '09 G37x Rep Power: 10	I'd be surprised if someone has. What I have learned just trying to get people to touch our heads and do a valve job is difficult because they are all afraid of the VVEL ladder. Doesn't head the FSM has do not touch written all over it. Elmo370z likes this. __________________ 2009 G37X \| 326 AWHP \| 264 AWTQ

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07-16-2018, 10:20 PM	#2 (permalink)
Jhill Track Member Join Date: Mar 2016 Location: San jose Posts: 854 Drives: 2013 370z sport Rep Power: 3384	I’ve never even heard of that on any car. You don’t mean knife edging the crank?

07-19-2018, 02:21 AM	#6 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,514 Drives: 09 Nissan 370Z M6 Rep Power: 39973	Is good if you have the VVEL delete option though