20v BT valves choice
05-20-2019, 02:26 PM
Post: #1
20v BT valves choice
Hi everyone,
I'm doing a rebuild of my 20v BT.
My next step is to buy new valves.
As I already got TODA spring, what valves would you recommend with that valve spring ? Stock valves, Supertech valves (has been told they are noisy), Ferrea valves or other brand ??
I'm still running stock camshaft too.
Thanks for your help.
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05-20-2019, 04:09 PM
Post: #2
20v BT valves choice
(05-20-2019 02:26 PM)izanagi Wrote:  Hi everyone,
I'm doing a rebuild of my 20v BT.
My next step is to buy new valves.
As I already got TODA spring, what valves would you recommend with that valve spring ? Stock valves, Supertech valves (has been told they are noisy), Ferrea valves or other brand ??
I'm still running stock camshaft too.
Thanks for your help.

Why do you want new valves??

unless your plans include building this for substantially more power, stick with the OEM valves (known quality).

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
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05-20-2019, 05:08 PM
Post: #3
20v BT valves choice
(05-20-2019 04:09 PM)oldeskewltoy Wrote:  
(05-20-2019 02:26 PM)izanagi Wrote:  Hi everyone,
I'm doing a rebuild of my 20v BT.
My next step is to buy new valves.
As I already got TODA spring, what valves would you recommend with that valve spring ? Stock valves, Supertech valves (has been told they are noisy), Ferrea valves or other brand ??
I'm still running stock camshaft too.
Thanks for your help.

Why do you want new valves??

unless your plans include building this for substantially more power, stick with the OEM valves (known quality).

Because after checking the size of the valve stem (according to the FSM), mine doesn't reach the size recommended. They are thinner.
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05-20-2019, 06:32 PM
Post: #4
20v BT valves choice
I agree with what's already been said, stick with OEM valves. I've never known there to be anything wrong with the original valves for any application so far, especially if you're running stock cams.
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05-21-2019, 08:21 AM
Post: #5
20v BT valves choice
(05-20-2019 04:09 PM)oldeskewltoy Wrote:  
(05-20-2019 02:26 PM)izanagi Wrote:  Hi everyone,
I'm doing a rebuild of my 20v BT.
My next step is to buy new valves.
As I already got TODA spring, what valves would you recommend with that valve spring ? Stock valves, Supertech valves (has been told they are noisy), Ferrea valves or other brand ??
I'm still running stock camshaft too.
Thanks for your help.

Why do you want new valves??

unless your plans include building this for substantially more power, stick with the OEM valves (known quality).

Should I buy new OEM valves ?
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05-21-2019, 04:42 PM
Post: #6
20v BT valves choice
Stem and guide "work" together..... the same FSM lists maximum valve/guide clearance. I'd recommend using that before you condemn the valves.

Exhaust valve - 0.1mm (.0039")

Intake valve - 0.08mm (.0031")

If they still are too small..... the choice is yours... replacing OEM valves, with OEM can get pricey, or you go oversize with Supertech....

As to Supertech... OEM valves the intake stem is larger, but with the Supertech the exhaust stem is larger........ not sure why that is....

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
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05-21-2019, 04:59 PM
Post: #7
20v BT valves choice
(05-21-2019 04:42 PM)oldeskewltoy Wrote:  Stem and guide "work" together..... the same FSM lists maximum valve/guide clearance. I'd recommend using that before you condemn the valves.

Exhaust valve - 0.1mm (.0039")

Intake valve - 0.08mm (.0031")

If they still are too small..... the choice is yours... replacing OEM valves, with OEM can get pricey, or you go oversize with Supertech....

As to Supertech... OEM valves the intake stem is larger, but with the Supertech the exhaust stem is larger........ not sure why that is....

I'm gonna check and let you know. Thank you very much for your help.
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05-21-2019, 10:52 PM (This post was last modified: 05-22-2019 12:03 AM by izanagi.)
Post: #8
20v BT valves choice
(05-21-2019 04:42 PM)oldeskewltoy Wrote:  Stem and guide "work" together..... the same FSM lists maximum valve/guide clearance. I'd recommend using that before you condemn the valves.

Exhaust valve - 0.1mm (.0039")

Intake valve - 0.08mm (.0031")

If they still are too small..... the choice is yours... replacing OEM valves, with OEM can get pricey, or you go oversize with Supertech....

As to Supertech... OEM valves the intake stem is larger, but with the Supertech the exhaust stem is larger........ not sure why that is....

After checking every valve stem, they are all between 4.92 and 4.93 mm. Inside valve guide is 5 mm.
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05-22-2019, 01:30 AM (This post was last modified: 05-22-2019 01:31 AM by oldeskewltoy.)
Post: #9
20v BT valves choice
(05-21-2019 10:52 PM)izanagi Wrote:  
(05-21-2019 04:42 PM)oldeskewltoy Wrote:  Stem and guide "work" together..... the same FSM lists maximum valve/guide clearance. I'd recommend using that before you condemn the valves.

Exhaust valve - 0.1mm (.0039")

Intake valve - 0.08mm (.0031")

If they still are too small..... the choice is yours... replacing OEM valves, with OEM can get pricey, or you go oversize with Supertech....

As to Supertech... OEM valves the intake stem is larger, but with the Supertech the exhaust stem is larger........ not sure why that is....

After checking every valve stem, they are all between 4.92 and 4.93 mm. Inside valve guide is 5 mm.

sounds like you are no more then .08mm.... as long as valve margins are within spec ...it's your call, but I'd likely re-assemble with new seals and call it good.

Dan -

You can |Sad .... OR you can ask for help!!!

OST Porting service - http://hachiroku.net/forums/showthread.php?t=19991
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05-22-2019, 08:47 AM
Post: #10
20v BT valves choice
(05-22-2019 01:30 AM)oldeskewltoy Wrote:  
(05-21-2019 10:52 PM)izanagi Wrote:  
(05-21-2019 04:42 PM)oldeskewltoy Wrote:  Stem and guide "work" together..... the same FSM lists maximum valve/guide clearance. I'd recommend using that before you condemn the valves.

Exhaust valve - 0.1mm (.0039")

Intake valve - 0.08mm (.0031")

If they still are too small..... the choice is yours... replacing OEM valves, with OEM can get pricey, or you go oversize with Supertech....

As to Supertech... OEM valves the intake stem is larger, but with the Supertech the exhaust stem is larger........ not sure why that is....

After checking every valve stem, they are all between 4.92 and 4.93 mm. Inside valve guide is 5 mm.

sounds like you are no more then .08mm.... as long as valve margins are within spec ...it's your call, but I'd likely re-assemble with new seals and call it good.

I have new seals. Thank you so much for the advice.
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