The 4A-GE engines for the 1985 product year are called "blue major" as opposed to the later "crimson prime" engines, since the paint shade over the valve handles differs, to point out different engine revision, using various port measurements, diverse airflow metering, and various insignificant variations around the engine.
Toyota Pickup Vans: Though not a overall performance motor vehicle, equipping these vehicles Along with the 4AGE included a astonishing degree of performance, proving that utility doesn’t need to imply uninteresting.
The stock sixteen valve head has undergone loads of growth time concerning cam configuration- in contrast to a displacement boost (finished properly), a Erroneous camshaft alternative will cause a very unsatisfactory established-up.
This engine was the main inside the collection to utilize Toyota's dual camshaft process often called Superior-Mecha Twin Cam, exactly where the timing belt drives the exhaust camshaft plus the exhaust camshaft then drives the inlet camshaft by using scissor gears.[18][19][twenty] The inlet camshaft functions to be a slave camshaft into the exhaust camshaft (the latter performing being a grasp camshaft for the engine), which led to your procedure becoming unofficially known as the "slave-cam procedure".
The The natural way aspirated engine’s possible has become observed at 280 horsepower at twelve,000 RPMs, but introducing compelled induction raises the bar significantly, combining that high rev capability with instead substantial amounts of Enhance can be the method for big quantities of electric power.
Also the opening with the Blacktop inlet ports are roughly four to 5mm broader at their entrance over the Silvertop offering a larger cross sectional area.
Equally engines have virtually similar exhaust cams. Having said that the Blacktop has 0.23mm larger elevate on the consumption. The cams is often swapped between the engines In case the VVT cam equipment is also swapped, but there will be no place as both cams are nearly similar so there could well be no genuine achieve. Blacktops cams even have a fascinating aspect in that The bottom circle (reduced side) of every one of the cam lobes are machined such that they have only a small ridge to get a friction surface area.
To allow for the several cam belt tensioner (see “Camshafts belt tensioner”) the Blacktop cam belt is a person tooth shorter at a hundred and ten in comparison with the 111 on the Silvertop.
The engine operates very well however the delivery was late two days. A total mess. I had to upset my application and go away function in the midst of the damn working day, just to come sign for your offload.
Pictured around the still left is the Silvertop port along with the Blacktop port at the right, even so the Blacktop head has been given some porting to remove sharp edges internally.
When fitting an aftermarket camshaft depending upon the level of elevate some materials may perhaps have to be faraway from the head all over this spot, mainly because of the deeper recesses with the Blacktop heads they can have cams with a higher lift equipped right before modifications are vital.
The Blacktop has the opposite, Additionally, it has the difference of getting the lid hook in to the bottom of your airbox foundation prior to swinging shut and remaining clamped down.
The rods are probable website failures also when subjected to authentic 4AG RPM Procedure. It can be an training in creativeness but a total sidestep for any serious efficiency-oriented application. If you like the torque of your 7AF, use the whole engine.
Among the swiftest delivery instances for international prospects. So far as I’m concerned Craig and the fellows at JnJmotors are the absolute go to’s for all my 4AGE swaps.