2VZ heads on 3VZ block
10-24-11, 08:45 PM
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2VZ heads on 3VZ block
So, I race an ES250 in the Chump Car endurance racing series, and at VIR 24hr the engine blew its bottom end to smithereens. Now I have a 3VZ engine block which I could use which has bad heads. Do anyone have the experience to tell which path is better: A/ To rebuild the 3VZ heads and switch ECU, intake and exhaust for a full 3VZ set-up in the ES250 or B/ Use the 3VZ block but mount the 2VZ heads, intake and exhaust manifolds.
Not having to switch the ECU and its wiring would be a big bonus, and with the front swaybar in front of the engine on the ES250 there will not be much room for the 3VZ front downpipe.
Anyone who knows?
Not having to switch the ECU and its wiring would be a big bonus, and with the front swaybar in front of the engine on the ES250 there will not be much room for the 3VZ front downpipe.
Anyone who knows?
10-25-11, 06:30 AM
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For what it's worth, the quick visual inspection seemed like the heads were the same except for intake and exhaust. So, no, they are not interchangeable but would require exhaust and intake from the respective engine. Combustion chambers, valve diameters, oil and water channels, head bolt pattern etc looked to be the same. I will take a closer look tonight and post what differences I can find.
EEngineer - are you sure about your answer or was it speculation?
EEngineer - are you sure about your answer or was it speculation?
10-25-11, 12:48 PM
#4
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i'm sure bud.
from wikipedia.
from wikipedia.
3VZ-FE
The basic design is a revised 3VZ-E iron-block motor, mated with aluminum DOHC 24 valve heads. It has a forged steel crankshaft and cast connecting rods. The upper intake plenum is of the split-chamber design with Toyota's ACIS variable-intake system feeding three sets of runners for both heads.
Because the VZ originated for truck and SUV use, the 3VZ-FE happens to be a physically tall motor. To make the engine fit in FWD engine bays, Toyota tilted the motor towards the firewall. This "tilt" is so severe (~15 degrees) that reaching the rear bank of cylinders is nearly impossible without first removing the intake plenum.
Parts-wise, the 3VZ-FE shares very little with the rest of the VZ engine family. The main bearings are shared with the 3VZ-E, but little else. Cams can also be interchanged between the 5VZ-FE and 3VZ-FE heads.
The basic design is a revised 3VZ-E iron-block motor, mated with aluminum DOHC 24 valve heads. It has a forged steel crankshaft and cast connecting rods. The upper intake plenum is of the split-chamber design with Toyota's ACIS variable-intake system feeding three sets of runners for both heads.
Because the VZ originated for truck and SUV use, the 3VZ-FE happens to be a physically tall motor. To make the engine fit in FWD engine bays, Toyota tilted the motor towards the firewall. This "tilt" is so severe (~15 degrees) that reaching the rear bank of cylinders is nearly impossible without first removing the intake plenum.
Parts-wise, the 3VZ-FE shares very little with the rest of the VZ engine family. The main bearings are shared with the 3VZ-E, but little else. Cams can also be interchanged between the 5VZ-FE and 3VZ-FE heads.
10-25-11, 04:46 PM
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Perhaps I'm just too used to putting together engines and cars from assorted bits and pieces? :-) Everything can be made to work one way or another. But my friend who built a Mercedes diesel engine and put it in a Citroen DS hadn't expected that he got 5 reverse speeds and only one (slow) speed forward as the engines did not rotate in the same direction...
I rarely trust all Internet info, but from time to time on the forums you can find someone who has tried and have the experiences to share. I will measure the differences between the heads and let you know what I find.
I rarely trust all Internet info, but from time to time on the forums you can find someone who has tried and have the experiences to share. I will measure the differences between the heads and let you know what I find.
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