Tomei Cam Question - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

max power rb · 14th August 2008, 02:00 PM

Is it necessary to have to buy the Tomei lifters when you buy the Tomei cams with 10.25 lift? Would using the stock lifters be ok?

Andy_P · 14th August 2008, 02:42 PM

I hope not....I've just bought the Tomei poncams....tuner guy didn't mention about buying them....but that's a gtst....yours might be a GTR of course.,...then it's all different

Alecci · 14th August 2008, 03:27 PM

I was told that I needed to upgrade the lifters when going above 9.25mm lift. They also recommend that you upgrade the valve springs as well.

max power rb · 14th August 2008, 03:31 PM

sorry that i didnt mention, its for a rb26dett r32 motor, anyways some people say its recommended some say its a must. i dont feel like spending that extra $400 if i dont have too.

Chris Wilson · 14th August 2008, 08:05 PM

You must buy the Tomei lifters, to get the extra lift the cams are ground with a smaller base circle diameter, which means you need lifters with added depth between cam lobe pad and shim extension. The higher lift Tomei cams need the cylinder head machining to clear the cam lobes, too.

kismetcapitan · 14th August 2008, 08:09 PM

true, but with Poncams no mods are necessary, although uprated springs can't hurt. I think the lift, 9.15mm, was chosen because it's the max you can get without having to modify the head or buckets, etc.

UK_SPAWN · 14th August 2008, 08:10 PM

id listen to him, something that complicated must be right

.. hehe no but seriously .. buy them! its an extra $400 or probably something a lot more expensive when things go wrong..

:edit: maybe nothing will go wrong then

but still ...

cokey · 14th August 2008, 08:34 PM

They are not manditory... but if you are going to use all or more of the revs

, then for peace of mind they may be a worthwhile investment.

see now I'm convinced.. Group buy folks ?????

max power rb · 15th August 2008, 01:22 AM

oh well whats another 400 dollars when i already spent 10,000

SamuraiSam · 15th August 2008, 04:26 AM

There is a lot of completely incorrect information in this thread. Kismetcaptain is right: Only use the Tomei lifters on Tomei Procams which have a smaller base circle than stock. With Poncams (Stock base circle) the stock lifters are what you need to run.

R.I.P.S NZ · 16th August 2008, 09:41 AM

What he said ^^^^^^^^^

GT-R Glenn · 16th August 2008, 11:01 PM

PON cams are designed as a straight drop in cam.
And as such use stock base circle, like Sam said.

Chris Wilson · 17th August 2008, 11:07 AM

AFAIK all Tomei RB* cams with 10.25 or more lift are small base circle and need the extended followers in order not to need ludicrously thick (and thus none stock size) shims.

SamuraiSam · 18th August 2008, 03:13 AM

Quote:

Originally Posted by Chris Wilson

AFAIK all Tomei RB* cams with 10.25 or more lift are small base circle and need the extended followers in order not to need ludicrously thick (and thus none stock size) shims.

Yes, those would be called Procams which I mentioned in my earlier post

I guess they have models of Procam that seem to have the same specs as the Poncam (the 252° and 260°) which have std. base circle diameter so you are correct the 10.25 and up.

14th August 2008, 02:00 PM	#1 (permalink)
max power rb GTR Register Member Join Date: Dec 2007 Posts: 22	Tomei Cam Question Is it necessary to have to buy the Tomei lifters when you buy the Tomei cams with 10.25 lift? Would using the stock lifters be ok?

16th August 2008, 09:41 AM	#11 (permalink)
R.I.P.S NZ GTR Register Member Join Date: May 2004 Location: Rotorua NZ Posts: 2,322	What he said ^^^^^^^^^ __________________ R34 GTR: Quickest full street trim skyline in NZ, 9.7 @ 137 on 1st test pass, first meeting in the UK, 10.4 @ 144. RIPS 240z, WRH8.36 / 163 @ 1.9 bar, stock crank, stock block, petrol RIPS 240z, RIPS RB30, quickest/fastest Jap street car in NZ 8.36/163mph 1.9 bar. NZs quickest Pro Import on petrol. RB engine building, alloy and stainless fabrication, affordable skyline tuning and high capacity repowers, worldwide shipping arranged. e-mail rips@inspire.net.nz www.ripsracing.com

16th August 2008, 11:01 PM	#12 (permalink)
GT-R Glenn GTR Register Member Join Date: Nov 2002 Location: Waiuku NZ Posts: 1,298	PON cams are designed as a straight drop in cam. And as such use stock base circle, like Sam said. Last edited by GT-R Glenn; 16th August 2008 at 11:05 PM.

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14th August 2008, 02:42 PM	#2 (permalink)
Andy_P GTR Register Member Join Date: Feb 2007 Location: Kent Posts: 120	I hope not....I've just bought the Tomei poncams....tuner guy didn't mention about buying them....but that's a gtst....yours might be a GTR of course.,...then it's all different

14th August 2008, 03:27 PM	#3 (permalink)
Alecci GTR Register Member Join Date: Jul 2003 Location: Sweden Posts: 285	I was told that I needed to upgrade the lifters when going above 9.25mm lift. They also recommend that you upgrade the valve springs as well.

14th August 2008, 03:31 PM	#4 (permalink)
max power rb GTR Register Member Join Date: Dec 2007 Posts: 22	sorry that i didnt mention, its for a rb26dett r32 motor, anyways some people say its recommended some say its a must. i dont feel like spending that extra $400 if i dont have too.

14th August 2008, 08:05 PM	#5 (permalink)
Chris Wilson GTR Register Member Join Date: Aug 2001 Location: Shropshire Posts: 1,551	You must buy the Tomei lifters, to get the extra lift the cams are ground with a smaller base circle diameter, which means you need lifters with added depth between cam lobe pad and shim extension. The higher lift Tomei cams need the cylinder head machining to clear the cam lobes, too.

14th August 2008, 08:09 PM	#6 (permalink)
kismetcapitan GTR Register Member Join Date: Nov 2005 Location: Seoul Korea Posts: 6,588	true, but with Poncams no mods are necessary, although uprated springs can't hurt. I think the lift, 9.15mm, was chosen because it's the max you can get without having to modify the head or buckets, etc.

14th August 2008, 08:10 PM	#7 (permalink)
UK_SPAWN GTR Register Member Join Date: Nov 2007 Location: Nottinghamshire Posts: 155	id listen to him, something that complicated must be right .. hehe no but seriously .. buy them! its an extra $400 or probably something a lot more expensive when things go wrong.. :edit: maybe nothing will go wrong then but still ...

14th August 2008, 08:34 PM	#8 (permalink)
cokey GTR Register Member Join Date: Sep 2003 Location: edinburgh Posts: 1,129	They are not manditory... but if you are going to use all or more of the revs , then for peace of mind they may be a worthwhile investment. see now I'm convinced.. Group buy folks ?????

15th August 2008, 01:22 AM	#9 (permalink)
max power rb GTR Register Member Join Date: Dec 2007 Posts: 22	oh well whats another 400 dollars when i already spent 10,000

15th August 2008, 04:26 AM	#10 (permalink)
SamuraiSam GTR Register Member Join Date: Oct 2007 Posts: 390	There is a lot of completely incorrect information in this thread. Kismetcaptain is right: Only use the Tomei lifters on Tomei Procams which have a smaller base circle than stock. With Poncams (Stock base circle) the stock lifters are what you need to run.

17th August 2008, 11:07 AM	#13 (permalink)
Chris Wilson GTR Register Member Join Date: Aug 2001 Location: Shropshire Posts: 1,551	AFAIK all Tomei RB* cams with 10.25 or more lift are small base circle and need the extended followers in order not to need ludicrously thick (and thus none stock size) shims.