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Location:
Brisbane - Chapel Hill
Registered:
June 2002
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Anyone here stroked/overbored a 4A-GZE effectively?
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Sun, 08 December 2002 10:41
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As above, I was wondering how it went. I have no idea where i could get someone to do the hard parts here in brisbane (welding the crank etc, boring it out, checking all the clearances etc...) I'd be wanting to do as much of it as possible, and not only for the purposes of reducing cost.
I'm interested in the extra low down torque, esp with a 12psi+ pulley kit and probably some headwork. The car would be a daily driver, so i dont intend on revving its guts out. Just a fun car to get me around... Plan to modify the engine as far as I can go with the STOCK computer.
I'm guessing a set of custom forged pistons would cost me upwards of 1000+ ? I dont even know where I could get pistons for it in brisbane...
Any help appreciated.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Location:
Eskilstuna, Sweden
Registered:
May 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Sun, 08 December 2002 12:02
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Interesting website................. 
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Location:
Brisbane - Chapel Hill
Registered:
June 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Tue, 10 December 2002 04:37
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hey cool1, you dont have the correct web address for perfourmance do you? google didnt help me :/ They are in brisbane huh?
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Location:
Sydney, OZ
Registered:
May 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Tue, 10 December 2002 06:19
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While your at it ask them if they can do a 7A 2.0L, The price I got so far is $3500 US!!!
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Tue, 10 December 2002 07:52
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Sorry about that peoples! Its all fixed now 
And yes its in Brisbane! Underwood to be exact!
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Location:
The Central Coast
Registered:
October 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Wed, 11 December 2002 05:45
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People do 7AGE's why not try doing a 7AGZE?
4AGZE's are known not to rev too high compared to the original N/A motors, so combine that with a 7AGE characteristic of more torque and less revability, I'd say you'd get heaps more torque overall!
May be a problem sourcing low compression forged pistons to suit. I wonder if 4AGZE ones'll fit hmmmm....interesting idea though.
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Location:
Canberra
Registered:
May 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Wed, 11 December 2002 12:47
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I think the un-revvy nature of the 4AGZE is due to intake breathing capability (restriction) rather than physical engine design.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Wed, 11 December 2002 13:21
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My (turbo'd) one didn't like 11,000rpm very much... Rod bolts stretched, came loose, and several weeks later died very inconveniently...
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Location:
Canberra
Registered:
May 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Thu, 12 December 2002 11:53
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nice one mrshin! 
did you intentionally rev it that hard?
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Location:
Brisbane - Chapel Hill
Registered:
June 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Thu, 12 December 2002 11:58
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hmmm, ok, what is the 7A-FTE (?) from? I gather it's just an evolution of the (4)A-series block is it?
On another note, what are the legalities of boring out blocks. If i have a 1.6L and bore it to 1.8 ... do i register it as 1.8 too? or is it just for me and the engine builder to know?
And another thing ... and I dont think I have recently searched for it so apologies if previously answered, but what is the concensus on the 20V block, on a std 4A-GZE bottom end (and supercharged of course...)
TIA
Esteban
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Location:
Sydney, OZ
Registered:
May 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Fri, 13 December 2002 06:00
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Rigoli Perfomance and Ray Hall have both all done 4AGE and 7AGE Turbo& S/C, 20V and 16V conversions before, By far the easiest way to stoke the 4A is use a 7A block. Boring a 4AGE will only get you to just over 1600cc, using the HSK stroker kit@ $3000 a pop, will give you close to 1700cc or just over with boring. If you want to keep the S/C, keep use a 16V and Don't bother using a 20V head and S/C, The 20V responds better to Turbo. Just My 2c..
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Location:
The Central Coast
Registered:
October 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Fri, 13 December 2002 06:19
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For those that don't know the 7A motor comes from the later model 1.8L fuel injected models.
Basically it's a 7AFE motor, narrow twin cam, being a homologation (spell?) from the 4A block, the GE head basically bolts directly on, a couple of things that need to be changed is the length of the timing belt (Porsche 944 belt fits!) and the timing belt pully. Some other things need to be changed that I can't remember right now. But it's pretty simple on the scale of conversions.
Go to here for more info. http://www.twelve100.com/faq%20and%20tech_pages/5A %20and%207A.htm
The easiest way to get performance out of the 7AFE is put the GE head on. That's basically exactly like stroking the 4AGE.
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Location:
Brisbane - Chapel Hill
Registered:
June 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Mon, 16 December 2002 06:41
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Excellent. A 7A-GZE Hybrid for me then I think. Just a couple of queries tho...
Any suggestions on the best place to get a 7A-FE? What sort of money am I looking at?
As for pistons, what pistons should I use? I need the low compression, and the forgednessness ... Is there a simple solution to my problem?
Timing belt, yeah that's a sinch it seems. Next question would be, where can I find someone I can _trust_ to rebuild the bottom end? (assuming I do, with forgies etc ... perhaps oversized too) And what is it likely to cost. Damn money ...
I think the engine would be built for low end torque, by the sounds of it. Would a 2 inch steel mandrel-bend exhaust provide it with enough exhaust gas velocity?
I'd imagine that for the moment I would recondition the GZE head too. What about the inlet tract? I suppose as it's forced, it dosent matter too much.
Anyone know a good cam? I'd have to get some variable cam sprokets and some dyno time too i suppose. I still want to use the original ECU and maybe a 12-14psi pulley kit. Anyone see any problems I might have?
TIA
apologies: length
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Location:
Sydney, OZ
Registered:
May 2002
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Re: Anyone here stroked/overbored a 4A-GZE effectively?
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Mon, 16 December 2002 08:09
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Well, The 7AGE should look like this...
 This is the one I currently have close to completion.
For your sake, their are a few differences worth noting. Pistons, use the same ones for that head, ie GE pistons with GE Head. Since you want a GZE, use the GZE pistons and head, or aftermarket forgies will cost over $1100. Also GE/GZE pistons are a Floating type, While the FE has interference fitting Pistons, So the FE rods need a slight mod to fit GE/GZE pistons. T/Belt, Yes the 944 is needed as 7A is a taller block. Price wise, So far The most expensive one I have bought has been a 10,000km Jap import @$750, If you look around, you can get them (As a dud) for as little as $150-200.
Yes , vernier gears would be smart, get the head cleaned up, ported, ($660) etc. Your standard ECU will hold up in standard form but with cams, extra boost, I would recommend an aftermarket ECU.
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