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Registered:
October 2003
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USING 20 VALVE HEAD FOR A 4AGTE
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Thu, 30 October 2003 08:47
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Guys im going to be running a 4agze block with a custom turbo manifold and t25 turbo and all the other fruit, just wanted to know if its worth while using a 20 valve head or sticking to the normal 4ag head? has anyone used a 20 valve head on the gze block and had success, can it be done, is it possible and the rewards good?
Any information would be excellent, thanks for the feedbak guys
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Location:
Eskilstuna, Sweden
Registered:
May 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Thu, 30 October 2003 09:16
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To me it would be a bit of a waste having a turbo charged 20v head etc. Not that I am speaking from experience though. But I thought the idea of the 20v was to help an engine breath and rev well. And for an NA motor this is important for power making.
But since you will be turboing it and hence force feeding the motor the extra expense of tuning and de-bugging a 20v over a 16 head would not be worth it in the end in terms of final power figure.
Having said that if you have the money and time it would be a rare build-up.
Cheers
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Registered:
January 2003
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Registered:
October 2003
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Thu, 30 October 2003 10:56
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Thanks for the quick reply and information guys, well just checked out that website and man that things is a beast..., so its out of the question wether it can be done ...as it has been done.. anybody has done it and has a write up or tech article or experience in using/building a 20 valve head for the gze block?. just wanting to know wether any problems come across in using the 20 valve head matchin up to the block as well as tuning ?
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Location:
Newcastle
Registered:
March 2003
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Thu, 30 October 2003 22:01
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i'll send sam an email and see what i can find out for ya.
regards Craig
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Location:
Parramatta
Registered:
July 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Thu, 30 October 2003 22:04
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i do know that rigoils use that partiular setup and they have a 11 sec corrolla out of it so it must work!?!?!
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Registered:
October 2003
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Fri, 31 October 2003 08:57
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yeah i gather a 20 valve head should work on the 4agze block, but need more info, thanks for the reply fellas
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Location:
Eskilstuna, Sweden
Registered:
May 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sat, 01 November 2003 00:19
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What pistons will you use, I imagine they will have to be custom being that you want low compression and don't want the fifth valve finding the piston......... 
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Registered:
October 2003
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sat, 01 November 2003 01:25
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I am currently running the 4agze from ae101 using a small port, head port and polished, im running stock pistons which gave way and i have taken the motor apart, i have oring block, balance crank, shot peened rods, strenghten the block etc, but thinking of using a 20 valve head to get more out of it..i will be replaceing the pistons and rods with something forged not sure of brand yet, but im trying to find out info about using 20 valve head on gze block
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Location:
Campbelltown, NSW
Registered:
November 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sat, 01 November 2003 06:19
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Hey dude grab the new ZOOM when it comes out on the front cover is a Ke-70 running a 4A-GTE 20v with a supra box and GT30 series turbo. It does 11.44@123mph down the quater with 294Kw at the wheels. It may help if not its a good read.
GO THE ROLLA!!!!
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Location:
Canberra
Registered:
May 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sat, 01 November 2003 07:53
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Thats awesome! Do you know the car? Tell us more 
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Location:
Campbelltown, NSW
Registered:
November 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sun, 02 November 2003 07:19
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Nah dude dont know the car its from NZ. Its a 4A-GZE strengthend bottom end with a silvet top 20v comp of 8.0/1 GT30 turbo pumping 1.5BAR into the little sucker. SARD 720cc injectors do thee fueling duties and the firing is done by EVO coils.
The whole show is run by a MoTeC M48 ECU.
If want to know more....... buy the mag its got a fair bit of toyota stuff in it.
ENJOY!!
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Location:
Canberra
Registered:
May 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sun, 02 November 2003 07:21
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Where do you get the magazine so early? I wasnt expecting to see it until around the 20th of November 
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Location:
Campbelltown, NSW
Registered:
November 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sun, 02 November 2003 07:28
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Im subscribed
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Location:
Brisbane
Registered:
March 2003
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Mon, 03 November 2003 02:02
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The 4AGTE seems to becoming a popular conversion, i'm actually having one put into a ke25 atm, will be much fun once its all done. Can't wait to see what power i put out with my setup.
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Location:
Parramatta
Registered:
July 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Mon, 03 November 2003 02:31
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that is some very serious power out of a 1.6 4 cyl hard to belive but god damn!
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Mon, 03 November 2003 02:45
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hmm 294kw at the wheels...
1.6L, assuming close to 100% efficiency
= 160Nm
with 1.5 bar boost (assuming it all gets in there)
=160x2.5 = 400Nm
294kw at the flywheel would be 6910rpm
if it made max power at 8000rpm, thats about 340kw at the flywheel...
so guessing 10% loss, that works out to be
323kw@7600rpm at the flywheel
assuming it has 95-100% efficieny, it's doable.... very high, but doable.....
Cya, Stewart
ps
kw = (engine size x 100 x (1+ boost) x rpm) / 9402
where engine size is in litres, boost is in Bar or atm
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Registered:
June 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Mon, 03 November 2003 02:47
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Is the KE70 from a place called Speedtech here in NZ??
Matt black with a huge FMIC??
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Location:
Sydney
Registered:
May 2003
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Tue, 04 November 2003 05:24
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please exercise caution if considering advise and/or utilizing their services
their ethics arent exactually what would be called australian
the boys screwed what tony built up
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Registered:
November 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Fri, 18 June 2004 18:00
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I have been searching through this site for more information on this 4A-GE 20V on 4A-GZE block. I have yet to see any relevant facts other than photos of it being down. Well at the shop we a piecing together plans for such a hybrid, we have a AE101 Toyota Levin Silver Top,4AGZE shortblock a Rebuild kit for the GZE block because we are not sure what the mileage is like and a rebuild kit for the 20V head since some of the seals are a mess.
Now I have searched the site looking for information on the headgasket type that is used for this hybrid also any other necessary modification that was done. SO far I haven't seen any of these bits in here. Anyone who has the knowledge drop a few lines.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Location:
Seattle area, USA
Registered:
June 2002
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sat, 19 June 2004 08:32
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Witzl is right.. the 16 valve big port head would be my choice. Heavily port and O/S valves, slight cams..
300+rwkw is possible.
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Location:
Baulko Hillo
Registered:
April 2004
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Re: USING 20 VALVE HEAD FOR A 4AGTE
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Sat, 19 June 2004 08:58
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What about Yogi's car??? Isn't that the set up this guy is inquiring about.
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