4agze vs 4age block

olson-g · 09-23-2009, 10:24 PM

my 88 supercharged Mk I developed a huge appetite for coolant in the last 6 months. Not leaking, but using 1 litre in 100 miles. Head gasket?, but no milk in oil, and compression about 130 psi in each cylinder. Going through the archives I found examples of blown head gaskets with similar results, combustion gas leaking into coolant over pressurizing radiator cap.
TEST: ran hose from radiator overflow tube taped to outside of car with outlet near drivers window. At idle, low speed no problems; but 10 seconds after max power water/steam comes pouring out of overflow. Obviously a small leak from cylinder to coolant- ok at idle, but at power pressure leaks through and builds up in coolant system.

Remove head, gasket looks ok. ? looks like small horizontal crack in #2 cylinder. gee darn. this is more expensive
will a later 4age replace the 4agze block? Any items to look for?
Plan A: put all my AGZE internals (crank, pistons, head) on a 4AGE block
problems?
thanks
gene olson
so cal

espguitarist33 · 09-23-2009, 10:43 PM

i know for a fact make sure it is a 7-rib block other then that idk

mr2tim · 09-23-2009, 11:28 PM

Mr Willis are you there?

Papo J · 09-24-2009, 08:28 AM

The NA block does not have a bung for the knock sensor unless it comes from a high comp corolla or geo, everything else should work just fine.

mr2_mk1.5 · 10-05-2009, 04:05 PM

sorry for hijacking this thread but are you saying that a geo and by geo you mean one that uses a 1.6L engine like say a late 80's tracker uses the same block as a 4age because if thats the case then i got some fun work to do

Papo J · 10-05-2009, 07:19 PM

Quote:

Originally Posted by mr2_mk1.5

sorry for hijacking this thread but are you saying that a geo and by geo you mean one that uses a 1.6L engine like say a late 80's tracker uses the same block as a 4age because if thats the case then i got some fun work to do

The GEO Prizm GSI was the only GEO to get the toyota 4A-GE engine, it was the small port high comp engine.

toyotaspeed90 · 10-06-2009, 03:31 PM

^^ eh, close enough for this discussion.

the predecessor to the geo prizm was the chevy nova... which in the 80's had a 4ac or a bigport 4age.... the prizm's in 88-89 had the 4af, prizm's (all but gsi) in 90-92 had a 4afe, and the gsi's had a smallport 4age.

if the head is off of the block you can tell based on what the pistons look like. There are only tiny little valve cutouts in the US gze pistons. The gze's should have a knock sensor in them (location depends on what generation you have) but as another mentioned, so do the high comp/smallport n/a 4age's.

mr2_mk1.5 · 10-17-2009, 09:50 PM

I actually did a little research and for anyone interested.....

1990–1992 Geo Prizms were powered by the 4A-FE or optional 4A-GE engine.
1993–1997 Geo Prizms were powered by the 4A-FE or optional 7A-FE engine.
1998–2002 Chevy Prizms were equipped with Toyota's 1.8 L 1ZZ-FE
2000–2002 models included VVT-i

09-23-2009, 10:24 PM	#1 (permalink)
olson-g No Skills Join Date: Apr 2008 Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (1/100% )	4agze vs 4age block my 88 supercharged Mk I developed a huge appetite for coolant in the last 6 months. Not leaking, but using 1 litre in 100 miles. Head gasket?, but no milk in oil, and compression about 130 psi in each cylinder. Going through the archives I found examples of blown head gaskets with similar results, combustion gas leaking into coolant over pressurizing radiator cap. TEST: ran hose from radiator overflow tube taped to outside of car with outlet near drivers window. At idle, low speed no problems; but 10 seconds after max power water/steam comes pouring out of overflow. Obviously a small leak from cylinder to coolant- ok at idle, but at power pressure leaks through and builds up in coolant system. Remove head, gasket looks ok. ? looks like small horizontal crack in #2 cylinder. gee darn. this is more expensive will a later 4age replace the 4agze block? Any items to look for? Plan A: put all my AGZE internals (crank, pistons, head) on a 4AGE block problems? thanks gene olson so cal

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

09-23-2009, 10:43 PM	#2 (permalink)
espguitarist33 Cage Fighter Join Date: Nov 2008 Location: west chester PA Posts: 528 Thanks: 4 Thanked 7 Times in 7 Posts iTrader Rating: (2/100% )	i know for a fact make sure it is a 7-rib block other then that idk

09-23-2009, 11:28 PM	#3 (permalink)
mr2tim SUPERcharZed ToyZ RacZer Join Date: Mar 2008 Location: South Florida Posts: 1,789 Thanks: 8 Thanked 118 Times in 111 Posts My Google Map iTrader Rating: (6/100% )	Mr Willis are you there?

09-24-2009, 08:28 AM	#4 (permalink)
Papo J 6SPD GTE Join Date: Sep 2006 Posts: 588 Thanks: 2 Thanked 50 Times in 49 Posts iTrader Rating: (0/0% )	The NA block does not have a bung for the knock sensor unless it comes from a high comp corolla or geo, everything else should work just fine.

10-05-2009, 04:05 PM	#5 (permalink)
mr2_mk1.5 Cage Fighter Join Date: May 2009 Location: Regina, Saskatchewan Canada Posts: 165 Thanks: 0 Thanked 10 Times in 9 Posts iTrader Rating: (1/100% )	sorry for hijacking this thread but are you saying that a geo and by geo you mean one that uses a 1.6L engine like say a late 80's tracker uses the same block as a 4age because if thats the case then i got some fun work to do

10-06-2009, 03:31 PM	#7 (permalink)
toyotaspeed90 No Skills Join Date: Jun 2006 Location: Bellingham, WA Posts: 2,401 Thanks: 0 Thanked 148 Times in 143 Posts My Google Map iTrader Rating: (0/0% )	^^ eh, close enough for this discussion. the predecessor to the geo prizm was the chevy nova... which in the 80's had a 4ac or a bigport 4age.... the prizm's in 88-89 had the 4af, prizm's (all but gsi) in 90-92 had a 4afe, and the gsi's had a smallport 4age. if the head is off of the block you can tell based on what the pistons look like. There are only tiny little valve cutouts in the US gze pistons. The gze's should have a knock sensor in them (location depends on what generation you have) but as another mentioned, so do the high comp/smallport n/a 4age's.

10-17-2009, 09:50 PM	#8 (permalink)
mr2_mk1.5 Cage Fighter Join Date: May 2009 Location: Regina, Saskatchewan Canada Posts: 165 Thanks: 0 Thanked 10 Times in 9 Posts iTrader Rating: (1/100% )	I actually did a little research and for anyone interested..... 1990–1992 Geo Prizms were powered by the 4A-FE or optional 4A-GE engine. 1993–1997 Geo Prizms were powered by the 4A-FE or optional 7A-FE engine. 1998–2002 Chevy Prizms were equipped with Toyota's 1.8 L 1ZZ-FE 2000–2002 models included VVT-i