Toyota SC-14 Supercharger
Description and Operation
Both of these superchargers are roots-type positive displacement= superchargers.
The rotors are fluorine resin coated. The units have their own lubricati= ng oil, =20 130cc. Stock boost is regulated to about 0.7 bar, and the units are normall= y=20 driven at 1.25 times crank speed (4A-GZE has a 7500rpm redline). Oversize= pulleys are available.
The Toyota 4-AGZE motor was used in the 86-89 MR2 Supercharged edition M= R2s. The motor is a modified 4-AGE unit coupled to an electronically engage= d roots type supercharger manufacturer currently unverified) and a Nippon D= enso air-to-air intercooler. Static compression ratio of the motor was drop= ped from 9.4:1 to 8.0:1. The camshafts are identical to a normally aspirate= d car, although their timing may be different. The motor is fitted with a d= ifferent type of injector with a higher flow capacity. Boost level is set a= t 8 PSI and achieved at 4000 RPM and higher, however the supercharger creat= es usable boost from idle through redline.
The supercharger is driven by a serpentine belt off of the crankshaft an= d shares=20 its drive belt with the water pump.
The supercharger adds heat to the intake charge both by conduction of ho= using heat since the supercharger is bolted onto the engine and also by pre= ssurizing the intake charge. With the bypass valve open and the supercharge= r disengaged the intake system raises the intake charge temperature by abou= t 30 degrees F once everything is up to operating temperature. Running unde= r full boost with an outside air temperature of 50 degrees F the air temper= ature of the SC outlet can get as high as 270 degrees.
Vent holes are placed at three points in the housing. One in the rear ge= ar housing and one to each of the shaft ends of the vanes on the front of t= he supercharger. The vents are all connected together via external metal tu= bes and hosing. An air valve is connected to all the vents, which can purge= them to the intake system after the airflow meter but before the throttle = body.
Supercharger Clutch
The supercharger clutch works in the same way as an air conditio= ning compressor clutch. The pulley itself spins freely on the supercharger-= input shaft. A coil=20 of wire sits behind the pulley and a metal disc sits in front. The front di= sc is connected to the actual input shaft of the supercharger. When the coi= l is energized, the disc is drawn against the rotating pulley and they then= rotate together as a unit until the coil is de-energized.
The manufacturer intended this clutch to be operated based on intake man= ifold vacuum.=20 If vacuum drops below 8"Hg the supercharger clutch is engaged. The clutch s= hould stay on=20 until the intake manifold vacuum has risen to over 10"Hg for a period of 5 = seconds. This time delay is required to avoid cycling of the clutch during = shifts and momentary throttle transitions. A delay circuit is required to r= eplicate this behaviour when fitting these units to other vehicles
The manifold vacuum during highway driving will be low enough that the S= C clutch will stay engaged all the time with an appropriate controller circ= uit of this type
Physical and Functional Data
Type Year Model Length Width Height Weight = Displacement
SC14 85-89+ 1G-GZE 311mm 148mm 254mm 11.9kg = 1420cc
SC12 86-89+ 4A-GZE ~249 148 254mm 10.8kg = 1200cc
Maintenance Data
Supercharger bearings
For the small bearing (shorter shaft, sealed only one side)
Koyo part number: 03NU0514-7
Inner diam: 0.668"
Outer diam: 1,772"
Thickness: 0.548"
For the thicker one, sealed both sides
Number unreadable, but seal number 03NU0518-2 (the "8" is a guess)
Same inner and outer diameter,
Thickness: 0.705"
10,000rpm +
Lubricant
The gears are run in Toyota supercharger oil, Toyota part number= 08885-80108. Total gear housing capacity is 130ml. Other types of lubrican= ts may work satisfactorily. It is not unreasonable to expect a decent hypoi= d gear oil to work. A 90-weight synthetic gear oil appears to be the closes= t commonly available equivalent.
Disassembly
Two special tools are required for disassembly of the supercharg= er; SST 09504-00011 for keeping the pulley from rotating while you undo the= nut that holds the clutch hub to the supercharger. If you have an impact w= rench you might be able to get by without this for removal. However you wil= l still need something to hold the pulley when you tighten the nut down upo= n re-assembly. SST 09814-22010 for removing the ring nut that holds the clu= tch pulley on. You can't get by without this short of having a set of ring = nut sockets or custom building the equivalent tool.
Calculating Blower Characteristics
Assuming the same blower:crank RPM ratio, and assuming the same = inlet/outlet
temps,
Pbig =3D Psmall * (Dbig / Dsmall)
Psmall =3D boost pressure with small blower in *absolute* units
Dsmall =3D displacement of small blower, any units
Dbig =3D displacement of big blower, same units as above
Pbig =3D boost pressure, in absolute units, with big blower
If you had 10 psi with the SC12. That's 24.7 psia at sea level.
With an SC14. (1.42L vs. 1.2L )
24.7 * (1.42 / 1.20) =3D 29.2 psia, or 14.5 psi boost at sea level.
This is only a basic calculation and doesn=92t take into account tempera= ture and altitude
The supercharger oil is around $35.00 (US) per kit
Kit comes with 2oz can of oil and a filler pump.
There is no substitute for the s/c oil… You must get the toyota oil!
I don't know what is in it, but is good stuff
The service intervals for the s/c oil is 60,000 miles. But it is a good idea to check the level of oil at every engine oil change to make sure you are not low.


Комментарии 5
как раскрутить болты на задних шестернях? какие сальники подходят, какие подшипники назад можно поставить? заранее благодарю за ответ
У меня стоит на обоих машинах тх12 так что размеры там скорее всего не соврадут с сц14
По разбору вот тебе ссылка на отчет для итона
vwts.ru/forum/158439
Там думаю найдеш ответы на вопросы
благодарю
какую то херь для американцев выложил переводи теперь)))))че за замут кого очкуешь?!
давай писать на русском будем и от себя, а не копировать текст хз откуда, если хочешь поделиться кидай ссылки на английского рода сайты… без обид, просто сидим втроем и все сошлись во мнении думаю не мы одни !
Выложил оригинальный текст в блог из открытых ресурсов. Это не БЖ машины. Выкладываю материалы по просьбе таких же втроем сидящих. В БЖ к машине все на русском и весь текст за моим авторством.
Цель таких записей сохранить текст в том виде в котором я на него ссылался в личке или коментариях. Если приводить ссылку с открытых ресурсов, то весьма частая проблема это исчезновение ресурса с течением времени. За несколько лет сталкивался с этим неоднократно.
Так что к блогу у меня нужно относиться как есть, надо читаем не надо смотрим БЖ к машинам)
Скажу больше таких записей в блоге у меня очень много, просто они скрыты)