What Boresize Does A Rb20det Have? Plz Help!

[sriTurbo]

Hi All,

I have a 1990 r32 gtst with the nice rb20det. Now i was searching on the internet to find a nice metal headgasket. There's only one with i don't know and that the bore of the engine. All i can find that is 78,0mm. But all the headgaskets are 80.5mm or 83,5mm. Can anyone tell me which one i need?

Cheers Patrick.

[Lukas 33]

Hey man. Here is some copy pasta from wiki. The URL http://en.wikipedia.org/wiki/Nissan_RB_engine

Bore and stroke

All Nissan engines follow a naming convention, identifying the engine family (in this case, RB), displacement, and features present- see the list of Nissan engines for detail.

The stock dimensions for the RB engines;

• RB20 - 2.0 L (1998 cc, bore: 78.0 mm, stroke: 69.7 mm)
  
• RB24 - 2.4 L (2428 cc, bore: 86.0 mm, stroke: 69.7 mm)
  
• RB25 - 2.5 L (2498 cc, bore: 86.0 mm, stroke: 71.7 mm)
  
• RB26 - 2.6 L (2568 cc, bore: 86.0 mm, stroke: 73.7 mm)
  
• RB30 - 3.0 L (2962 cc, bore: 86.0 mm, stroke: 86.0 mm)
  

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Where have you looked to find only those sizes? Im not an RB20 person so don't quote me on anything. Like I said, straight copy pasta from wiki

Edited December 16, 2009 by Lukas 33

[sriTurbo]

That's the same that i find. But on nengun or rhdjapan the Tomei headgasket for the rb20 is with bore size 80.5 and 83.5. I don't really know which one i need.

chrs

[Rekin]

This is what ive found;

The following is intended for hcr32 and hnr32 owner or any car sporting the rb20det.

Vehicle model: hcr32 and hnr32

Engine type: rb20det

Displacement (cc): 1998

Combustion chamber: pent-roof type

Valve arrangement : DOHC belt drive

Bore x stroke mm: 78.0 x 69.7

Compression ratio : 8.5

Compression pressure: (kg / cm2) / (rpm) 12.0 / 300

Maximun output (net) (ps / rpm): 215 / 6400

Maximun torque (net) (kg-m / rpm): 27.0 / 3200

Fuel consumption ratio (g / GS.h) / (rpm): 215 / 2400

Dimensions m/t (l / w / h) (mm): 845x660x685

Dimensions a/t (l / w / h) (mm): 830x660x685

Idle speed (rpm): 800

Ignition timing a/t (BTDCdegrees / rpm): 15 / 650

Ignition timing m/t (BTDCdegrees / rpm): 20 / 650

Firing order: 1-5-3-6-2-4

Valve clearance cold (mm) intake: 0.45 +/- 0.003

Valve clearance cold (mm) exhaust: 0.38 +/- 0.003

Throttle chamber bolts torque setting (kg-m) first stage: 0.9 - 1.1

Throttle chamber bolts torque setting (kg-m) second stage: 1.8 - 2.2

Flywheel run-out limit (mm): 0.10

Con rod nut tightening stage 1 (kg-m): 2.3 - 2.9

Con rod nut tightening stage 2(kg-m): 3.9 - 4.5

[sriTurbo]

That's the same as to above post. Also 78.0mm bore. So waht headgasket do i need than. I would think i need an 78.0mm headgasket but they are not for sale only the 80.5 and 83.5 for a rb20det.

chrs