Polish n Port - Skyline Owners Club

**Dan** · 5th October 2008, 07:38 PM

Is there any real gain to this and were does it and how much?

**Ahapartridge** · 5th October 2008, 07:41 PM

If you were removing your head anyway Dan then it would be a definite god move to port match the inlet/exhausts and a general tidy up, if you were not planning on removing the head for other reasons then I would say it would be an expensive job for not massive gains.

**Dan** · 5th October 2008, 08:00 PM

Well, the head is coming off anyway...

**Lambo Door Kits Ltd.** · 5th October 2008, 08:20 PM

I have heard that to go beyone 500bhp, this is a must, but your talking around £600-£700 to have done professionally.

**Dan** · 5th October 2008, 08:30 PM

WOW, didnt think it was quite that much to have done!

**Lambo Door Kits Ltd.** · 5th October 2008, 08:43 PM

Cheaper if someone has a CAD system I think but not many people do.

**Dan** · 5th October 2008, 08:59 PM

Hmm, will have to ask about and see if anyone knows things, thought it would be like 150 or something! ooops. Ah well. Going to be spending enough as it is.

**Ahapartridge** · 6th October 2008, 07:05 AM

You can do a bit yourself as far as the Port matching and a bit of a tickle up to smooth off any rough marks with a dremel or a drill with some stones.

Are you stripping the head down completely ie valves out etc?

I thought you was a mechanic, should you be asking these sorts of questions?

**Ahapartridge** · 6th October 2008, 07:06 AM

Quote:

Originally Posted by Lambo Door Kits Ltd.

I have heard that to go beyone 500bhp, this is a must,

Not a must at all, It would certainly not do any harm but I think the real gains would be through cam choice

**Checkpoint** · 6th October 2008, 06:52 PM

Some Evo heads cost about £2000 for machine work, (if your bhp is heading for four figures) and that's just a 4 cylinder.

Like Pete says, it won't do any harm to give it a tidy up while it's off.

IIRC they have run 1000bhp in the states on a std RB26 head.

**Lambo Door Kits Ltd.** · 6th October 2008, 07:50 PM

Quote:

Originally Posted by Ahapartridge

Not a must at all, It would certainly not do any harm but I think the real gains would be through cam choice

Oh right, just Andy W told me the head can't cope with the airflow at 500 bhp or more withour head work. Perhaps i got it wrong. I am in lala land sometimes.

**Spearmint** · 6th October 2008, 07:52 PM

The stock flow on an RB25 is enough for around the 500ath mark maybe a little more.

You won't see much past 520ath anyway.

Though in the case of an RB26 there isn't much point as mentioned in the posts above.

**Dan** · 6th October 2008, 10:43 PM

Well the head will be being stripped down once I know where my finances are.

I will be doing it myself as pointed out I am a mechanic... But, Ive never ever looked at porting and polishing. Looks like I might have me a go at it though

(Polishing that is)

**Dan** · 6th October 2008, 10:46 PM

Also she was pushing 406 I think ath. I don't think I am going to be able to do anything with the head to get any more power, just make it all stronger.

**ivor** · 7th October 2008, 03:24 AM

go onto amazon and pick yourself up a few books on it they are interesting even if aimed at chevy lumps
Amazon.co.uk: How to Build, Modify and Power Tune Cylinder Heads (Speedpro): Peter Burgess, David Gollan: Books

5th October 2008, 07:38 PM	#1
Dan Admin Administrator Membership No. 227 Join Date: Dec 2005 Location: All the way down south County: Dorset Drives: R32 GTR, MGZS, XJ600S and a bloody expensive pushbike! Posts: 4,132	Polish n Port Is there any real gain to this and were does it and how much?
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5th October 2008, 08:00 PM	#3
Dan Admin Administrator Membership No. 227 Join Date: Dec 2005 Location: All the way down south County: Dorset Drives: R32 GTR, MGZS, XJ600S and a bloody expensive pushbike! Posts: 4,132	Well, the head is coming off anyway...
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5th October 2008, 08:20 PM	#4
Lambo Door Kits Ltd. Lambo Door Kits Ltd. Authorized Trader Join Date: Jan 2008 Location: St. Andrews County: Fife Drives: R33 GTST Posts: 1,572	I have heard that to go beyone 500bhp, this is a must, but your talking around £600-£700 to have done professionally.
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5th October 2008, 08:30 PM	#5
Dan Admin Administrator Membership No. 227 Join Date: Dec 2005 Location: All the way down south County: Dorset Drives: R32 GTR, MGZS, XJ600S and a bloody expensive pushbike! Posts: 4,132	WOW, didnt think it was quite that much to have done!
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5th October 2008, 08:43 PM	#6
Lambo Door Kits Ltd. Lambo Door Kits Ltd. Authorized Trader Join Date: Jan 2008 Location: St. Andrews County: Fife Drives: R33 GTST Posts: 1,572	Cheaper if someone has a CAD system I think but not many people do.
	__________________ http://www.lambodoorkits.co.uk http://www.carbon-designs.co.uk Authorized dealers for Ibherdesign, Blitz, cusco, HKS, Jun, C-West, The list goes on. Supplier of Carbon Goodness!

5th October 2008, 07:41 PM	#2
Ahapartridge Half Man Half Partridge Club Member Membership No. 067 Join Date: Dec 2005 Location: In th'ouse County: Cheshire Drives: A 350 without the zee Posts: 4,857	If you were removing your head anyway Dan then it would be a definite god move to port match the inlet/exhausts and a general tidy up, if you were not planning on removing the head for other reasons then I would say it would be an expensive job for not massive gains.

5th October 2008, 08:59 PM	#7
Dan Admin Administrator Membership No. 227 Join Date: Dec 2005 Location: All the way down south County: Dorset Drives: R32 GTR, MGZS, XJ600S and a bloody expensive pushbike! Posts: 4,132	Hmm, will have to ask about and see if anyone knows things, thought it would be like 150 or something! ooops. Ah well. Going to be spending enough as it is.
	__________________ Need a website, domain or hosting - let me know!

6th October 2008, 07:05 AM	#8
Ahapartridge Half Man Half Partridge Club Member Membership No. 067 Join Date: Dec 2005 Location: In th'ouse County: Cheshire Drives: A 350 without the zee Posts: 4,857	You can do a bit yourself as far as the Port matching and a bit of a tickle up to smooth off any rough marks with a dremel or a drill with some stones. Are you stripping the head down completely ie valves out etc? I thought you was a mechanic, should you be asking these sorts of questions?

6th October 2008, 06:52 PM	#10
Checkpoint 01241 879999 Authorized Trader Join Date: Feb 2007 Location: Arbroath County: Angus Drives: Cayenne Turbo, R34GTT, R33GTST x 2, Pajero SWB 2.8td, Ducati 996, Posts: 1,352	Some Evo heads cost about £2000 for machine work, (if your bhp is heading for four figures) and that's just a 4 cylinder. Like Pete says, it won't do any harm to give it a tidy up while it's off. IIRC they have run 1000bhp in the states on a std RB26 head.
	__________________ 9.2 @ 165mph on low boost 13.6 @ 103mph in a 2.5 ton 4x4 It was me! www.checkpointgarage.com www.dentistmapped.com

6th October 2008, 07:52 PM	#12
Spearmint Per Ardua Ad Astra Area Rep Membership No. 461 Join Date: Jan 2006 Location: A shithole County: Northamptonshire Drives: Project Spearmint Posts: 7,417	The stock flow on an RB25 is enough for around the 500ath mark maybe a little more. You won't see much past 520ath anyway. Though in the case of an RB26 there isn't much point as mentioned in the posts above.
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6th October 2008, 10:43 PM	#13
Dan Admin Administrator Membership No. 227 Join Date: Dec 2005 Location: All the way down south County: Dorset Drives: R32 GTR, MGZS, XJ600S and a bloody expensive pushbike! Posts: 4,132	Well the head will be being stripped down once I know where my finances are. I will be doing it myself as pointed out I am a mechanic... But, Ive never ever looked at porting and polishing. Looks like I might have me a go at it though (Polishing that is)
	__________________ Need a website, domain or hosting - let me know!

6th October 2008, 10:46 PM	#14
Dan Admin Administrator Membership No. 227 Join Date: Dec 2005 Location: All the way down south County: Dorset Drives: R32 GTR, MGZS, XJ600S and a bloody expensive pushbike! Posts: 4,132	Also she was pushing 406 I think ath. I don't think I am going to be able to do anything with the head to get any more power, just make it all stronger.
	__________________ Need a website, domain or hosting - let me know!

7th October 2008, 03:24 AM	#15
ivor Skyline Owners Club Club Member Membership No. 353 Join Date: Jan 2006 Location: on a war canoe Drives: weapon systems Posts: 1,162	go onto amazon and pick yourself up a few books on it they are interesting even if aimed at chevy lumps Amazon.co.uk: How to Build, Modify and Power Tune Cylinder Heads (Speedpro): Peter Burgess, David Gollan: Books

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