valve guide poll - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

kismetcapitan · 4th July 2008, 05:38 PM

just another fact-finding thread to try and collect some empirical data...

btw, choice 3 regards losing an engine due to factory-installed OEM guides failing.

paul cawson · 4th July 2008, 05:53 PM

Yes I had one break up very annoying. Would replace them every build I do from now on

GT-R Glenn · 5th July 2008, 12:39 AM

Correct me if I am mistaken.
Factory guides are iron and can crack and break pieces off.
Silicon Bronze or Tobin bronze guides dont crack or have pieces snap off....

ShaggyR32GTR · 5th July 2008, 06:59 AM

Quote:

Originally Posted by GT-R Glenn

Correct me if I am mistaken.
Factory guides are iron and can crack and break pieces off.
Silicon Bronze or Tobin bronze guides dont crack or have pieces snap off....

I had uprated guides in mine, engine was taken out and all but one of the guides had cracked, lucky no damage was done. Would of made a mess at 2bar boost up the drag stip. Thought while engine was out would refresh bottom end, found two of my main bearing knackered, think the clearences were too tight. Bring on the 2.8 stroker now

Work in progress

kismetcapitan · 5th July 2008, 08:55 AM

do you know what your bearing clearances were?

ShaggyR32GTR · 5th July 2008, 09:46 AM

Quote:

Originally Posted by kismetcapitan

do you know what your bearing clearances were?

I will check and let you know asap. Cheers Toby.

R32 Combat · 5th July 2008, 10:38 AM

I made mine from bronze alloy.

The stock guides are sintered iron which is self lubricating but brittle.

Bronze is self lubricating and not brittle. It's a no brainer really.

GT-R Glenn · 5th July 2008, 10:38 PM

The "name" brand ones cost $1000 a set, and making them is piss easy for any good machine shop, you could easily get a set made for 1/3 of that.

SR BEAST · 6th July 2008, 05:17 AM

Does any other valve guide fit the rb26 from another nissan engine ? vg30 ..etc ?

I need to change my oem ones on my other head and our dealer doesn't carry the rb26's

andy@amt · 24th August 2008, 08:46 PM

When you lift the valve higher you get more valve rock in the guide iron ones
tend to crack because of this thats why you need to use bronze to eliminate
this from happening.
thanks
andy@amt

2rismo · 25th August 2008, 07:52 AM

RB's don't usually break intake guides but exhaust sides are another story. You should make the poll so that you can tick two options.

I.e. I've never had a guide fail but I've upgraded for the new engine and they're fine.

View Poll Results: valve guide failure?
I've never had a factory OEM valve guide fail or crack.	5	31.25%
I've found one or more factory-installed guides cracked, but no engine failure	3	18.75%
I found my guides cracked when they disintegrated into my engine, destroying my block	3	18.75%
I've upgraded my valve guides and they are good	4	25.00%
I've upgraded my valve guides and they cracked, but no other damage	1	6.25%
I've upgraded my valve guides and the damned things broke into pieces, taking out my engine with it	0	0%
Voters: 16. You may not vote on this poll

4th July 2008, 05:38 PM	#1 (permalink)
kismetcapitan GTR Register Member Join Date: Nov 2005 Location: Seoul Korea Posts: 6,316	valve guide poll just another fact-finding thread to try and collect some empirical data... btw, choice 3 regards losing an engine due to factory-installed OEM guides failing. Last edited by kismetcapitan; 4th July 2008 at 05:43 PM.

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4th July 2008, 05:53 PM	#2 (permalink)
paul cawson New Users Join Date: Jul 2003 Location: Essex Posts: 2,061	Yes I had one break up very annoying. Would replace them every build I do from now on

5th July 2008, 12:39 AM	#3 (permalink)
GT-R Glenn GTR Register Member Join Date: Nov 2002 Location: Waiuku NZ Posts: 1,176	Correct me if I am mistaken. Factory guides are iron and can crack and break pieces off. Silicon Bronze or Tobin bronze guides dont crack or have pieces snap off....

5th July 2008, 08:55 AM	#5 (permalink)
kismetcapitan GTR Register Member Join Date: Nov 2005 Location: Seoul Korea Posts: 6,316	do you know what your bearing clearances were?

5th July 2008, 10:38 AM	#7 (permalink)
R32 Combat New Users Join Date: Jan 2004 Location: Berkshire Posts: 4,332	I made mine from bronze alloy. The stock guides are sintered iron which is self lubricating but brittle. Bronze is self lubricating and not brittle. It's a no brainer really.

5th July 2008, 10:38 PM	#8 (permalink)
GT-R Glenn GTR Register Member Join Date: Nov 2002 Location: Waiuku NZ Posts: 1,176	The "name" brand ones cost $1000 a set, and making them is piss easy for any good machine shop, you could easily get a set made for 1/3 of that.

6th July 2008, 05:17 AM	#9 (permalink)
SR BEAST GTR Register Member Join Date: Mar 2005 Posts: 258	Does any other valve guide fit the rb26 from another nissan engine ? vg30 ..etc ? I need to change my oem ones on my other head and our dealer doesn't carry the rb26's

24th August 2008, 08:46 PM	#10 (permalink)
andy@amt GTR Register Member Join Date: Sep 2003 Location: chesterfield Posts: 101	When you lift the valve higher you get more valve rock in the guide iron ones tend to crack because of this thats why you need to use bronze to eliminate this from happening. thanks andy@amt

25th August 2008, 07:52 AM	#11 (permalink)
2rismo GTR Register Member Join Date: Jun 2006 Posts: 57	RB's don't usually break intake guides but exhaust sides are another story. You should make the poll so that you can tick two options. I.e. I've never had a guide fail but I've upgraded for the new engine and they're fine.