 | Projects North West Datsun Enthusiasts Forum : Member Rides : Projects Topic: 620GRX |
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620GRX
Novice 
Joined: 24 August 2007 Location: United States Posts: 10 |
 Topic: 620GRXPosted: 05 September 2007 at 4:00am |
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I'm going to try and post my truck it was ok before i got in a wreck ( my excuse) to finish my truck
1) I'm putting in a 240z dash
2) 3/4 roll cage
3) custom console w/ pantera style shift gate
4) 4 wheel dics brakes from GM Tahoe ( i work for GM dealership)
5) miig lights and LEDs ( F1 rain light)
6) painless wiring kit
last but not least motor I will make 275HP when done ( yes I'm a king fan)
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datzenmike
Expert 
Joined: 14 April 2006 Location: Canada Posts: 1098 |
Posted: 05 September 2007 at 9:33pm |
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Should be interesting, I put an '84 4X4 dash in my 620. It was discussed on here a year ago and a 280 Z dash was also mentioned but not tried. What motor are you putting in to get 275 hp out of 'cause the L20B is only good for a little over half of that. Turbo'd it might approach that much, but in order to keep it together so much would have to be spent on it that an engine transplant would be cheaper.
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'78 620 flatbed,'79 dizzy, Bosch 90 amp alt.,p.s.,Z 5 speed, '80 transfer case,toyo 4:10 ft. axle with 4 piston calipers,'85 4x4 wire harness and dash,2oo sx elect. windows, 12.50x33 tires on 82 frame
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620GRX
Novice
Joined: 24 August 2007 Location: United States Posts: 10 |
Posted: 05 September 2007 at 10:01pm |
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Hi Datzenmike
well the block i have is a z24 with a diesel crank, carrillo rods, ( at the shop as we speak) punched out 30 over, decked, assy, bal w/ flywheel lighten to spin faster, center force clutch I think stage 2, the head I'm doing my self at work I got stainlesssteal valves isky springs titaniun seats, ported and all the bells and whisles I have two SU carbs .
and my I have a coil for each spark plug like the GM 8.1 motor .
there's more I have it down on paper .
I have to thank steve at sunrise motors for some of the spec's i needed.
if youlike I could pass on the spec's
OH the motor should spin over 8 thou rpms two years ago a motor let go at 10.4 rpm
a transplant would take the fun out of building my GRX motor. thanks bert.
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datzenmike
Expert
Joined: 14 April 2006 Location: Canada Posts: 1098 |
Posted: 05 September 2007 at 11:37pm |
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Originally posted by 620GRX Hi Datzenmike well the block i have is a z24 with a diesel crank, carrillo rods, ( at the shop as we speak) punched out 30 over, decked, assy, bal w/ flywheel lighten to spin faster, center force clutch I think stage 2, the head I'm doing my self at work I got stainlesssteal valves isky springs titaniun seats, ported and all the bells and whisles I have two SU carbs .
and my I have a coil for each spark plug like the GM 8.1 motor .
there's more I have it down on paper .
I have to thank steve at sunrise motors for some of the spec's i needed.
if youlike I could pass on the spec's
OH the motor should spin over 8 thou rpms two years ago a motor let go at 10.4 rpm
a transplant would take the fun out of building my GRX motor. thanks bert. My mistake  you seem to have it together. You will be running a turbo or s/c to get those numbers, right? The factory found that the L head would support about 200hp and so developed a twin cam 16 V head that would fit all L series and probably the Z series as well. The LZ14B made about 200 hp at 8,000 and 236 at 11,000 normally aspirated. Below is the LZ20B... I don't have the hp for the normally aspirated motor but the turbo LZ20B was better than 550. Here is the 16 V head for it...  Beautiful isn't it? Almost unlimited breathing, totally unlimited with a turbo. This head design led to the FJ series and is similar to the KA24DE head too. Yeah, post your spec sheet, bet it's good reading. mike |
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'78 620 flatbed,'79 dizzy, Bosch 90 amp alt.,p.s.,Z 5 speed, '80 transfer case,toyo 4:10 ft. axle with 4 piston calipers,'85 4x4 wire harness and dash,2oo sx elect. windows, 12.50x33 tires on 82 frame
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motav8td
Groupie 
Joined: 04 February 2007 Location: United States Posts: 77 |
Posted: 06 September 2007 at 12:04am |
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I got a question? How much for the build? What if I want a regular rebuild on a l20b maybe with forged pistons and a mild port on the head. I could just leave the engine there.... Thanks! Mota...
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datslow521
Novice
Joined: 03 May 2007 Location: United States Posts: 12 |
Posted: 06 September 2007 at 9:49pm |
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what is that head from?
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rotary powered 521
71 510 wagon l20b |
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datzenmike
Expert
Joined: 14 April 2006 Location: Canada Posts: 1098 |
Posted: 06 September 2007 at 11:07pm |
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Originally posted by datslow521 what is that head from? It's a Nissan LZ twin cam 16V head developed for use on L and Z series motors and should not be confused with the OS Giken head which is some what similar. Datsun LZ twin cam heads were developed in the power hungry, early 1970's. The LZ head was designed to give a power boost to the tried, tested and incredibly successful Datsun L series engines. The obvious way to increase output of the very strong L series bottom end was to improve its breathing.
The LZ engine was to form the basis of legends in many forms of motor sports, due to its superior design and versatility. Using the L series bottom end, allowed it to be used in so many different capacity variations. Crankshaft strokes available for different variations of the L and Z series engines that could be used with the LZ head are : - 59.9 mm L13, 66 mm L14, 73.7 mm L16, 78 mm L18, 86 mm L20B, 89mm Z22, 92 mm Z24. Bore sizes can be varied from 83 mm to 90 mm. This allowed the engine to be raced in most capacity categories including : -
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'78 620 flatbed,'79 dizzy, Bosch 90 amp alt.,p.s.,Z 5 speed, '80 transfer case,toyo 4:10 ft. axle with 4 piston calipers,'85 4x4 wire harness and dash,2oo sx elect. windows, 12.50x33 tires on 82 frame
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