173

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Original submission by T Mar 21st 2007:

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Holden 173 Engine. Note 173 cast into the block between the Alternator and the Engine Mount. Image by Tim. Click to Enlargen.

173 Engine:

These engines were originally fitted to HQ Holdens and had no external badge to identify them. Toranas that were factory fitted with them carried the 2850 badge externally.
173 Cubic Inches Displacement
Bore 3.500"
All the red sixes have the same 3.00" stroke except the 201, 202 and 3.3 which have a 3.25" stroke.Blue and black 3.3's also have a 3.25" stroke.  149, 161, 173, 179, 161 and 186 Engines have Main Bearing journals the same size. The last 173's used the larger 202 size main bearing journals.
Holden 173 Engine disembled, typical of all Red 6 Engines. Note the Rockers are Adjustable because it is a 149 Head. Standard 173 Heads use Non-Adjustable Rockers. Image by Bubsy. Click to Enlargen.
 

Links:

Bubsy's Shed
 

Red 173 Identification chart.

 MODEL Introduced
mm/yy
 Finished
mm/yy
 Engine prefix Capacity
CuIn (cc)
 Power
bhp (kw)@rpm
 Torque
ft.lbs.(Nm)@rpm
 Compression
 HG 7/70 7/71 GE 173(2850) 112(84)@4400 160(217)@2000 8.3
 HG 7/70 7/71 GD 173(2850) 118(88)@4400 168(228)@2000 9.4
 HQ 7/71 10/74 QE 173(2850) 112(84)@4400 160(217)@2000 8.3
 HQ 7/71 10/74 QD 173(2850) 118(88)@4400 168(228)@2000 9.4
 HJ 10/74 7/76 QE 173(2850) 112(84)@4400 160(217)@2000 8.3
 HJ 10/74 7/76 QD 173(2850) 118(88)@4400 168(228)@2000 9.4
 
 
2850 badge on an LX Torana fitted with an Holden 173 Engine. Image by Neil . Click to Enlargen.

 
173 Engine. Note the portion of the head removed between
the no 1 and 2 spark plugs. Image by Vernonv. Click to Enlargen.
The red 173 was introduced with the HQ to replace the 161 HG. Just as the 202 replaced the 186.
173 combustion chambers are the same size as 161. The 173 rocker gear is non adjustable (adjustable on 161) and the spark plugs have tapered seats (gasket seats on 161).
173 engines were fitted to HQ-WB, LJ/H/X-UC Toranas and VB/C/H Commodores. 
173 Casting. Photo by Q-Ball. Click to Enlargen.
 

Links:

Bubsy's Shed

Terms:

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