4A-GE 20v oversize valves

[myne]

Toyocrash; If TRD dont make them, I dare say there's no benefit to having them.
I think your engineer hasnt dealt with these engines before. It's not like TRD havent had 10 years to make and refine performance parts for the 20v.

[oldcorollas]

Toyocrash; If TRD dont make them, I dare say there's no benefit to having them.
I think your engineer hasnt dealt with these engines before. It's not like TRD havent had 10 years to make and refine performance parts for the 20v.

geez, shoulda told CelicaRA45 that TRD was the be all and end all for the 3SG

seriously tho... what TRD sell, and what is optimum for a race engine can be totally different things. TRD parts are mass marketed, easily available bits and are not a pinnacle in engineering.. they are just better than stock

[myne]

And yet they miss such an obvious money spinner just for the hell of it?
It's not like valves are particularly hard to design or make.
At the end of the day they're out to screw every last dollar out of the enthusiast, so why would they deliberately choose not to make any?

[oldcorollas]

because....
a) there is little to be gained for such an expensive exercise (ie changing 12 valves and valve seats for a 1-2mm diameter increase), for the common street racer boy.
b) it is not a bolt on/bolt in prospect, which also counts as a negative for the average street racer boy.
c) for street applications, there is not so much to be gained since ppl are mostly at lower rpm, and would not even notice with their SOTPdyno.
d) because of above reasons, there is no point for TRD to research and develop (in terms of production) larger valves because they won't sell many.

on the other hand, Toycrash is building the motor for a race car.... so every little bit counts.

TRD are trying to make money out of the boy racer who has more money than sense... how many people on toymods actually buy TRD products (not including caps and shirts etc ) not many because there are often cheaper ways to do it if you have the sense to do 5 mins research.

[Toycrash]

And why TRD havent tried bigger valves?
What racing classes TRD had this engine? I think if you read the class regulations and restrictions, you'll see there is regulation for STOCK size valves etc.
TRD wont develope engine unless it's driven under some restrictive racing class for fairly new wehicles.
I dont have such restrictions

And if YOU guys cant do something, dont judge ppl that really can.
I am no means engine specialist, but my engineer is.

[Mr Revhead]

sorry toycrash/oldcorollas but i beleive you are very wrong in your assesment of TRD.
they are not a "boyracer" company, sure they have a few bling products, but the majority of there stuff is very good and suits its purpose very well

most their engine stuff is made for racing.... eg group A and the JGTC and N2 classes.
for the 16v they did bigger valves etc for both classes, they also made group A and N2 bits for the 20v but not bigger valves. so there is classes they competed in where it was allowed. there was just no need for it. you must be running one hell of a peaky engine to need bigger exhausts

[Celica RA45]

what you will have to do is get some blanks from ferrea valves in the states ,you would need the measure ments and dia size and they will make them to suit ,i use these valves in my 3sge motors as the titatium has a life with high lift cams and not a good idea to go down that road super alloy 1s are fine

[Toycrash]

I am simply amaized with you people... And somewhat disapointed.

Like i said before, i didnt want tech lecture!



Ferrea seems to have 5.5mm stem, close enough. I'll look in to them, thanks for first good tip

[oldcorollas]

sorry toycrash/oldcorollas but i beleive you are very wrong in your assesment of TRD.

OT but...
after flipping thru this years catalogue (which i just happen to have with me ), i stand by my comment..
i'm not saying "it's not good", i'm saying "it's not best".
apologies for OT.

[Toycrash]

OT but...
after flipping thru this years catalogue (which i just happen to have with me ), i stand by my comment..
i'm not saying "it's not good", i'm saying "it's not best".
apologies for OT.

LOL true soul mate
ppl must remember there is TRD parts and then there is TRD parts...

But as said before they had restrictions, we dont. Maybe they were intake or exhaust or directly valve size, but belive me they had them.

And for 16v the oversize valves are most likelly to the Atlantic engine(developped for it)

ps. go measure 16v vs. 20v exhaust valves and compare them to 16v vs. 20v intake valve overall diameter...

[Mr Revhead]

no, they didnt have restrictions... group A and N2 rules allow for increased valve size. with the 20v they chos enot too... i wonder why?

and TRD japan didnt make the atlantic parts, that was TRD USA. a seperate division.
im talking about the TRD japan products

now im not saying for your application you wont need them (i dont know what your up to) but youd be the first iv ever heard of that does.

so yeah, it woul dseem your going to need some custom ones

[oldcorollas]

fwiw, the discontinued 20V exhaust valve number is 13715-AE001
they just say it is a higher durability part, lighter, improved ihalation resistance and compatible with standard part.....
耐久性向上、軽量化、吸入抵抗向上、ノーマルと使用可

it was listed as discontinued in 2003, and i can't find archived pages before that, and there are buggerall link sabotut hem on the net... big seller huh?

[FMS01]

Dude in USA developing OS valves for 20V at the moment.
Club4AG.com is also your friend

Cheers,
Julian.

[exquisit]

toycrash welcome to the politics of toymods
=)
u have pm

[Starfire]

Toymodders going off topic? Nah... that would never happen

While we all agree that there is little point to bigger valves in a 20v you will get some improvement. When you are racing and the rules allow every advantage you can get is a big one.

The law of diminishing returns comes in to play but you still get a return.

I would love some details about what else is being done to this monster of an engine