Sr20vet rwd conversion which pistons? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kk101 · 03-29-2020, 02:35 AM

Hi guys I?m building. Rwd sr20vet using p12 head and p12 turbo cam with super tech shimless valves +1mm

I just found out the pistons we using are CP DET pistons so there is no valve relief

The motor is assembled and spun by hand no sound of hitting, but I?ve heard that I need to use sr20vet pistons.
Is this true ?

RZRSHARP_240SX · 03-29-2020, 09:01 AM

I am currently running det stroker pistons on my vet. And I have no issues as long and your clearances are good you shouldn’t have a issue.

kk101 · 03-29-2020, 09:30 PM

dumb question but does the lift change once the vvl is activated at higher rpm ?

RalliartRsX · 03-30-2020, 09:02 AM

Yes....hence the variable valve LIFT in the terminology.

You will have to clay your engine WITH the high lobe activated. It serves no purpose to turn the engine over on the low lobes as that tells you zilch on valve clearance......

kk101 · 03-30-2020, 08:09 PM

Quote:

Originally Posted by RalliartRsX

Yes....hence the variable valve LIFT in the terminology.

You will have to clay your engine WITH the high lobe activated. It serves no purpose to turn the engine over on the low lobes as that tells you zilch on valve clearance......

How?s this achieved ?

jr_ss · 03-31-2020, 07:41 PM

Hook up an air source to the VVL oil feed line to lock the rockers while you turn the motor over

kk101 · 04-02-2020, 04:55 PM

re checked the clearance and it does hit when the vll is engaged.

is it safe to just fly cut the pistons for the valve relief or am i better of swapping with sr20ve pistons

*brndck* · 04-03-2020, 08:15 AM

Quote:

Originally Posted by kk101

re checked the clearance and it does hit when the vll is engaged.

is it safe to just fly cut the pistons for the valve relief or am i better of swapping with sr20ve pistons

whats your budget? if you have to pay for a shop to disassemble the engine, and a machine shop to cut reliefs, it can get expensive.

if you can do your own disassembly and machine work, then its obv cheaper.

if you want to skip the cost of machining all together, just buy new pistons that are designed for this application.

PRT73 · 04-06-2020, 05:20 PM

what did you use as the thickness of the head gasket?

Kaisen · 04-14-2020, 07:40 PM

You can get the CP SR20VE pistons with the valve relief for a peace of mind

03-29-2020, 02:35 AM	#1
kk101 Join Date: May 2008 Location: Melbourne Age: 32 Posts: 30 Trader Rating: (1) Feedback Score: 1 reviews	Sr20vet rwd conversion which pistons? Hi guys I?m building. Rwd sr20vet using p12 head and p12 turbo cam with super tech shimless valves +1mm I just found out the pistons we using are CP DET pistons so there is no valve relief The motor is assembled and spun by hand no sound of hitting, but I?ve heard that I need to use sr20vet pistons. Is this true ?

03-31-2020, 07:41 PM	#6
jr_ss Post Whore! Join Date: Dec 2005 Location: Pa Posts: 6,052 Trader Rating: (34) Feedback Score: 34 reviews	Hook up an air source to the VVL oil feed line to lock the rockers while you turn the motor over __________________ My SR20VET

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03-29-2020, 09:01 AM	#2
RZRSHARP_240SX Leaky Injector Join Date: Mar 2008 Location: Calgary Age: 32 Posts: 64 Trader Rating: (0) Feedback Score: 0 reviews	I am currently running det stroker pistons on my vet. And I have no issues as long and your clearances are good you shouldn’t have a issue.

03-29-2020, 09:30 PM	#3
kk101 Join Date: May 2008 Location: Melbourne Age: 32 Posts: 30 Trader Rating: (1) Feedback Score: 1 reviews	dumb question but does the lift change once the vvl is activated at higher rpm ?

03-30-2020, 09:02 AM	#4
RalliartRsX Post Whore! Join Date: Apr 2006 Location: Maryland Posts: 4,753 Trader Rating: (32) Feedback Score: 32 reviews	Yes....hence the variable valve LIFT in the terminology. You will have to clay your engine WITH the high lobe activated. It serves no purpose to turn the engine over on the low lobes as that tells you zilch on valve clearance......

04-02-2020, 04:55 PM	#7
kk101 Join Date: May 2008 Location: Melbourne Age: 32 Posts: 30 Trader Rating: (1) Feedback Score: 1 reviews	re checked the clearance and it does hit when the vll is engaged. is it safe to just fly cut the pistons for the valve relief or am i better of swapping with sr20ve pistons

04-06-2020, 05:20 PM	#9
PRT73 Join Date: Dec 2007 Location: FRANCE Age: 35 Posts: 41 Trader Rating: (0) Feedback Score: 0 reviews	what did you use as the thickness of the head gasket?

04-14-2020, 07:40 PM	#10
Kaisen Leaky Injector Join Date: Feb 2015 Location: Singapore Age: 31 Posts: 67 Trader Rating: (0) Feedback Score: 0 reviews	You can get the CP SR20VE pistons with the valve relief for a peace of mind