4AGE - Advanced Specs

[takai]

Just creating this thread so that a lot of the less commonly known specs can be noted down for future reference.
Measured up the head on my spare smallport the other day and here is some of the bits i measured:

Head capacity: 39cc
Cylinder spacing (center to center): 89mm

Feel free to post other measurements as well.

[Garth AE86]

ah! awesome been looking for these! thanks!

[myne]

Cam lobe base circle : 28.08mm
(as measured by me with a digital vernier) I assume it's supposed to be 28.00mm

[LeeRoy]

Engine:
Capacity: 1587cc
Bore: 81mm
Stroke: 77mm
Firing order: 1-3-4-2

Manifolds: Distortion Limit
Inlet: 0.05mm
Exhaust: 0.30mm

Cylinder Head:
Valve seat angle: 45deg
Valve seat contact width: 1.0-1.4mm
Distortion limit of cylinder block: 0.05mm

Valves and Springs:
Valve stem diameter:
Inlet: 5.970-5.985
Exhaust: 5.965-5.980mm
Valve stem to guide clearance:
Inlet: 0.025-0.060mm. Limit: 0.08mm
Exhaust: 0.030-0.065. Limit: 0.10mm
Valve length:
Inlet: 99.60mm. Limit: 99.10mm
Exhaust: 99.75mm. Limit: 99.25mm
Valve face angle: 44.5deg
Valve head margin limit: 0.5mm
Valve Spring free length: 41.09mm
Valve Spring distortion limit: 1.8mm
Valve Spring installed height: 34.7mm
Valve Spring min tension @ installed height: 143N

Camshaft and Bearings:
Bearing journals: 5
Journal diameter: 26.949-26.965mm
Bearing oil clearance: 0.035-0.072mm. Limit: 0.10mm
Cam Lobe height: 35.41-35.51mm. Limit: 35.11mm
Camshaft end float: 0.080-0.190mm. Limit: 0.25mm
Camshaft runout limit: 0.04
Cam follower:
Diameter: 27.975-27.985mm
Oil clearance: 0.015-0.046mm. Limit: 0.07
Timing Belt tensioner spring: Free Length: 43.5mm
Tension @ 50.2mm extention: 93-103N
Valve Clearance (cold)
Inlet: 0.15-0.25mm
Exhaust: 0.20-0.30mm

Thats all for now
- LeeRoy

[takai]

Oh yeah, torque specs.
Stock Bolts: 22ft/lbs and then 90* + 90*
ARP Studs: 68ft/lbs.

[Black]

Cylinder Block
Type: 4cyl inline (obviously )
Material: Cast iron
Cyl Bore diameter: 81.00-81.03mm. Limit: 81.23mm
Bore Taper and ovality limit: 0.02mm
Cyl head face distortion limit: 0.05mm

Pistons and Rings
Piston diameter: 80.89-80.92mm
Oversize piston avail. :0.50mm
Piston oil clearance: 0.10-0.12mm
Number of rings:
Compression: 2
Oil control: 1

Crankshaft and Bearings
Main bearings: 4
Crankshaft end float: 0.02-0.22 mm Limit: 0.30 mm
Main bearing journal diameter: 47.982 - 48.000 mm
Main bearing oil clearnace: 0.015 - 0.033 mm Limit: 0.10 mm
Main bearing journal and crank pin taper and ovality limit: 0.02mm
Crankshaft runout limit: 0.06 mm
Main bearing undersize available: 0.25mm
Crank pin diameter: 41.985 - 42.000 mm
Crank pin bearing oil clearance: 0.020 - 0.051 mm Limit: 0.08 mm
Crank pin bearing undersize available: 0.25 mm
Connecting rod endfloat: 0.15 - 0.25 mm Limit: 0.30mm

Cheers Black

[LeeRoy]

Torque Wrench Settings:
Cylinder Head Bolts
First Stage: 29Nm
Second stage: +90deg
Third Stage: +90deg
Camshaft Bearing Cap bolts: 13Nm
Camshaft Sprocket Bolt: 59Nm
Inlet Manifold Bolts and nuts: 27Nm
Exhaust Manifold bolts and nuts: 39Nm
Timing Belt tensioner pulley bolt: 37Nm
Main Bearing bolts: 60Nm
ConRod nuts
First Stage: 39Nm
Second Stage: +90deg
Flywheel Bolts: 74Nm
Oil Pump pickup pipe bolts and nuts: 9Nm
Oil Pump cover screws: 10Nm
Oil Pump Retaining bolts: 21Nm
Crankshaft Puley Bolt: 137Nm
Crankshaft Seal carrier bolts: 9Nm
Sump bolts and nuts: 5Nm
Oil Cooler Pressure Reg:
Plug: 37Nm
Adaptor Bolt: 54Nm
Banjo Bolt: 29Nm
Spark Plugs: 18Nm

I would also like to stress that when these torque setting are getting read that both the bolts and holes are free from grime and gunk etc as when the bolts are getting done up if they bind even at all then you will get a false torque wrench setting and you will blow gaskets etc - not good at all.

Happy Mechanicing
- LeeRoy

[LeeRoy]

I also found out today from toyota that the head bolts are not "torque to yield", meaning they can be reused provided the threads on them are clean and free from dirt, grime, etc as posted above.

- LeeRoy

[WHITCHY]

Just adding the thread size for the head bolt/stud holes if anyone ever needs it.
M10x1.25
Cheers.
-Whitchy-

[kingmick]

Oh yeah, torque specs.
Stock Bolts: 22ft/lbs and then 90* + 90*
ARP Studs: 68ft/lbs.

arp head studs is 60ft/lbs

[kingmick]

I also found out today from toyota that the head bolts are not "torque to yield", meaning they can be reused provided the threads on them are clean and free from dirt, grime, etc as posted above.

- LeeRoy

i would not recommened reusing them! i have a box full of them in my shed! not worth destroying an engine for the sake of a few dollars spent on new bolts!

[takai]

My packaging came with a dodgy little slip which said 68ft/lbs, so thats what i was going off.
Also, from the other thread here are some piston weights:
JE: 340g [custom turbo]
ROSS:350g [custom turbo]
CP: <insert weight here>
Wiseco: 294g [custom NA]
340g [custom turbo]
ACL(mahle): 359g [atmo (piston 284g, pin 75g)]
345g [turbo (piston 270g, pin 75g)]
Arias: 288g [off the shelf atmo]
303g [of the shelf turbo]

[ToySprinta]

Are these torque settings the same for a GZE??
Cheers
Steve

[30psi 4agte]

Just creating this thread so that a lot of the less commonly known specs can be noted down for future reference.
Measured up the head on my spare smallport the other day and here is some of the bits i measured:

Head capacity: 39cc
Cylinder spacing (center to center): 89mm

Feel free to post other measurements as well.

Dont have a deck height do ya ??

In my calculations to achieve a comp ratio of 8.92:1 (as close as i could get to 8.9)
I have used......

Bore: 81mm
Stroke: 77mm
Deck height : .95mm
Gasket thickness : 1.2mm
Head volume: 39cc

This is a bit of a "educated" guess. So if anyone can confirm this please do .

Ill let you know where im going with this later

[Mr Revhead]

I also found out today from toyota that the head bolts are not "torque to yield", meaning they can be reused provided the threads on them are clean and free from dirt, grime, etc as posted above.

- LeeRoy

that is incorrect! they are most certainly are torque to yeild
they can be reused, but must be measured, ill post up specs tonight when im near my manual. however they are also very cheap to buy new and well worth the security