16v oversize valve seats
09-19-2016, 07:43 AM (This post was last modified: 09-19-2016 07:56 AM by harkes.)
Post: #1
16v oversize valve seats
Hey

So, can such a thing be found - do I need any at all? I have a set of oversize Ferrea that I'd like to upgrade with together with some higher lift cams. Gotta find that last 0.1hp Tongue

- Niels


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09-19-2016, 09:40 AM
Post: #2
16v oversize valve seats
Check out this thread.... http://club4ag.com/forums/viewtopic.php?f=13&t=19447
Nothing is impossible if you have the $$$$$$$ Smile

Cheers... jondee86

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.
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09-19-2016, 10:52 AM
Post: #3
16v oversize valve seats
I kinda knew it could be done, but is it necessary for, what essentially is a street car? Are the F/A engines running oversize valve seats?
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09-19-2016, 05:44 PM
Post: #4
16v oversize valve seats
(09-19-2016 10:52 AM)harkes Wrote:  I kinda knew it could be done, but is it necessary for, what essentially is a street car? Are the F/A engines running oversize valve seats?

every 4AG with Atlantic type O/S valve coming from Loynings uses O/S seats... some steel, some beryllium copper.

They run O/S seats so the the bowls can grow too....

[Image: AEU86 AE86 - 16v oversize valve seats]


Stock intake valve seats are just shy of 32 mm, while the exhaust seat is a little short of 28.5mm. Ferrea OS valves are 32mm, and 27.5. By the time you make the stock seats/bowls the same ID of the OS seats/bowls, the seat itself is too thin and may not stay in the head. Even a little bit of movement in the seat can cause catastrophic results

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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09-20-2016, 03:11 AM (This post was last modified: 09-20-2016 03:40 AM by harkes.)
Post: #5
16v oversize valve seats
Copy that. Thanks Dan. Do you know where Lyonings get their seats from? You maybe even have part numbers?

Man...that last 0.1hp is gonna get expensive - maybe I'll just turn off the lights and do another dyno pull LOOL
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09-20-2016, 09:42 AM
Post: #6
16v oversize valve seats
I wouldn't go through so much trouble just to tip it over 200hp.
Surely there must be other options left open to extract a little bit more performance
out of the engine? Low drag alternator / underdrive pulley or something of the kind..

FABRICA MI DIEM, PVNC!
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09-20-2016, 10:14 AM
Post: #7
16v oversize valve seats
(09-20-2016 09:42 AM)Ivan141 Wrote:  I wouldn't go through so much trouble just to tip it over 200hp.
Surely there must be other options left open to extract a little bit more performance
out of the engine? Low drag alternator / underdrive pulley or something of the kind..

Haha - that was a joke Ivan Wink I think I can safely round up and say the 200hp goal has been achieved. But this is "only" with 8,4mm lift cams and stock valves so now I have decided to raise the ceiling.
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09-20-2016, 12:25 PM
Post: #8
16v oversize valve seats
Which cams do you use and what's your CR if I may ask.

AE86 ex-daily
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09-20-2016, 04:02 PM
Post: #9
16v oversize valve seats
(09-20-2016 12:25 PM)Bean Wrote:  Which cams do you use and what's your CR if I may ask.

Honestly I am not sure. I bought them second hand as Schrick 288 but I dont think they are. More likely 300 (in Toda terms). I have spend hours investigating the numbers on them with no result. My CR is 11.3.


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09-20-2016, 05:04 PM
Post: #10
16v oversize valve seats
harkes Wrote:Do you know where Lyonings get their seats from?

They make them for themselves... from what I've seen they have a long tube of steel/copper that they "slice" off sections to use for seats.

(09-20-2016 04:02 PM)harkes Wrote:  
(09-20-2016 12:25 PM)Bean Wrote:  Which cams do you use and what's your CR if I may ask.

Honestly I am not sure. I bought them second hand as Schrick 288 but I dont think they are. More likely 300 (in Toda terms). I have spend hours investigating the numbers on them with no result. My CR is 11.3.
[Image: AEU86 AE86 - 16v oversize valve seats]

those look like "big" cams... they appear to be larger then 8.4mm... (just guessing....) Do you know how close they come to the edge of the bucket cylinder casting??

This is the 272/235 - 9.4mm cam - note it is VERY close, but the bucket has not had to be modified for clearance
[Image: AEU86 AE86 - 16v oversize valve seats]



Btw.... I assume you are still using the piston/rod combo? Then you don't have to worry about valve interference if you decided to go OS....

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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