cnc nissan cylinder heads - Page 2 - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ANDY black s13 · 06-25-2012, 10:59 AM

The $300 is not just the extra metal removed alone,its the time it takes to do the work,wear on the cutters and the machines used,the power the machine consumes all have to be factored into the equation,For quality work them prices are good,Be probably double here in the UK cost wise

Skilz10179 · 06-25-2012, 02:33 PM

$900 for truely quality head work isn't bad. I'm not knockin the price tag really, just the difference between the two stages do to the operations using the same set up and just running a different program...

As for the wear on tooling, cast aluminum is as soft as it gets. Unless you're doing hundreds of heads you're not going to be wearing out tools. I've been a machinist for over 10 years, i'm speaking from experience.

jimefam · 06-25-2012, 02:51 PM

Wow I'd really appreciate the link to the near 400cfm sr20 head? I'm gonna say bs on that one. Also guys remember Cnc is nice and all but the initial head has got to be something proven cause I can port a head like shit and program it into a Cnc and that don't make it good. Another thing is you can't go strictly based off of cfm #'s as that only tells part of the story. That's why it's better to get a head from a shop with a proven car then one who looks good on the flow bench but hasn't proven to be effective. Btw 900 is a great price for a GOOD PNP job Cnc or by hand don't mean shit.

eccnc · 06-25-2012, 06:27 PM

Quote:

Originally Posted by jimefam

Wow I'd really appreciate the link to the near 400cfm sr20 head? I'm gonna say bs on that one. Also guys remember Cnc is nice and all but the initial head has got to be something proven cause I can port a head like shit and program it into a Cnc and that don't make it good. Another thing is you can't go strictly based off of cfm #'s as that only tells part of the story. That's why it's better to get a head from a shop with a proven car then one who looks good on the flow bench but hasn't proven to be effective. Btw 900 is a great price for a GOOD PNP job Cnc or by hand don't mean shit.

you are correct about the copying a shit head into a program and coming out with pretty looking shit. thats why i am testing on our chassis dyno as well as the flow bench

eccnc · 06-25-2012, 06:41 PM

Quote:

Originally Posted by Skilz10179

$300 is a pretty big price difference between stage 1 and stage 2. I could see if it were hand ported but after you have the programs writen they are the same amount of work as far as set up goes.

the main differences between the stage 1 and stage 2 are the 7 angle valve job, that has to be done on a seperate machine, and the cnc combustion chambers

no offense intended just trying to explain the price

joeboo1 · 06-25-2012, 07:06 PM

Interested.......will you be working on the L motors for the 240z, 260z, and the 280z as well???

06-25-2012, 02:33 PM	#32
Skilz10179 Zilvia Member Join Date: Nov 2008 Location: Detroit Age: 41 Posts: 162 Trader Rating: (3) Feedback Score: 3 reviews	$900 for truely quality head work isn't bad. I'm not knockin the price tag really, just the difference between the two stages do to the operations using the same set up and just running a different program... As for the wear on tooling, cast aluminum is as soft as it gets. Unless you're doing hundreds of heads you're not going to be wearing out tools. I've been a machinist for over 10 years, i'm speaking from experience. __________________

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

06-25-2012, 10:59 AM	#31
ANDY black s13 Zilvia Member Join Date: Mar 2012 Location: erith kent england Age: 53 Posts: 153 Trader Rating: (0) Feedback Score: 0 reviews	The $300 is not just the extra metal removed alone,its the time it takes to do the work,wear on the cutters and the machines used,the power the machine consumes all have to be factored into the equation,For quality work them prices are good,Be probably double here in the UK cost wise

06-25-2012, 02:51 PM	#33
jimefam Leaky Injector Join Date: Jul 2008 Location: cumming, ga Posts: 107 Trader Rating: (1) Feedback Score: 1 reviews	Wow I'd really appreciate the link to the near 400cfm sr20 head? I'm gonna say bs on that one. Also guys remember Cnc is nice and all but the initial head has got to be something proven cause I can port a head like shit and program it into a Cnc and that don't make it good. Another thing is you can't go strictly based off of cfm #'s as that only tells part of the story. That's why it's better to get a head from a shop with a proven car then one who looks good on the flow bench but hasn't proven to be effective. Btw 900 is a great price for a GOOD PNP job Cnc or by hand don't mean shit.

06-25-2012, 07:06 PM	#36
joeboo1 Leaky Injector Join Date: Oct 2008 Location: sanfernando valley ca. Age: 41 Posts: 76 Trader Rating: (4) Feedback Score: 4 reviews	Interested.......will you be working on the L motors for the 240z, 260z, and the 280z as well???