Toymods Car Club Inc: Tech & Conversions => 7A-FE to 7A-GE or GZE Conversion Check List

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Johnny
Forums Junkie

Location:
Sydney, OZ
Registered:
May 2002

Re: 7A-FE to 7A-GE or GZE Conversion Check List

Sun, 25 July 2004 09:16

Quote:

Sounds good in theory, but i wouldn't do it, 7A series is weak, your putting a stronger head on a weak bottom, don't get the turbo 7A mixed with the local, as i read they upgraded some internals.

Might as well spend your money on bolt-on kits. And upgrade the internals of the original, but thats $$$

Internals...They aren't any different to a stocker, The crank will hold, conrods, well, no bloody way will they handle anything past 10 psi, the design are crap (ie that's why I run aftermarket) the big end bolts in the rod are taped, unlike the GE's which are actual bolts!!

Quote:

One weekend is realistic when the guy that is helping you is a retired mecho!

One word... BULLSHIT, hasn't clue what's he's in for... I'm probably the only one here that can say yes I built one and had it running...
Firstly they aren't the same block, the 7A is
a)Taller
b) use a two piece sump
c) the shape where the sump bolts on each block is a different shape
secondly, if you slap the GZE head on, you'll wind up with a comp of less than 7:1, which is completely useless even for a S/c setup, you'll need to swap the pistons over, which by the way, aren't a direct swap either, 7A use and interference Gudgeon Pin. 4A's use a floating Gudgeon... you want the floating setup as they are less stressful on the pistons. Other things to consider, A/C, P/S and that all important alternator, which also won't fit once you've swapped heads... This was on an N/A version too, how are you going to run the S/C? everything on the 7A and GZE do sit in different positions,and not all the holes are in the same location either....I'm lucky I have full engineering workshop at my disposal to make and modify brackets for this stuff. what about the lower timing gear?, again the 7A and 4A are different, timing covers won't fit (I left them off!)
CAMSHAFT TIMING?? everywhere you read this needs to be set up properly, and its not just a matter of setting the engine to TDC and lining up the marks, sorry, you need to find the cam specs, then you'll need to know what lift that engine needs at TDC...ie you'll need dial indicators, vernier gears, that how I did it, but there are otherways too (And I did stuff it up too in the beginning!!) ECU, a standard 7AFE ECU WILL NOT support these engines, you can get away with a GZE one, but wiring it in alone will take a day or two if your experienced, A/M well even a baboon can do it within two days!! I'm sorry but these ARE the REAL issues... and there in NO WAY it can be done in a weekend unless you have 20 people running around!!

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