Holden grey motor speed/power record holders

Posts relating to early (Pre 1985) Hotrodding History in Australia, including Hotrod and Custom Shows plus early Drag Racing, Speedway, Hillclimbs etc.
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turns
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Re: Holden grey motor speed/power record holders

Post by turns »

Hi Harv

Remember there were heaps of capable spanner men back then that were into boats. A mate of mine was right into it back then but he was into Dodge 6 engines. Here is a link that refers to the era I mean.

http://www.cawpba.com/

There were some hot Grey motors back then however I don't know of the most powerful.

Cheers Turns
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olfrt
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Re: Holden grey motor speed/power record holders

Post by olfrt »

Have a look at this Harv. Runs low 12's in full street trim. Have a look through the various videos on 'Youtube'.
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Harv
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Re: Holden grey motor speed/power record holders

Post by Harv »

Thanks Turns. The vintage boat guys are cool, but agree that it is hard to measure horsepower in that type of racing (other than holding course/class records). A mate has a wooden hulled version, running a Repco head (he also has a hydroplane with a Merlin :mrgreen: ).

G'day olfrt,
That's Mark Riek's humpy. It has pulled 200-ish rear wheel horsepower on a dyno, with a standard head (port and polished). Frightening out of a grey - Repco was only pulling that figure at the crank. I'm going to need around 220 ponies at the crank for mine to meet the 10.99 Modified cut off, so it seems doable.

Cheers,
Harv
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Re: Holden grey motor speed/power record holders

Post by Harv »

An update on the quickest grey motor quarter mile pass. At the 27th of January 1980 meeting at Surfers Paradise (Ampol 3), Dennis Paul ran a 10.83s quarter mile pass in the grey powered Resurrection FED in E/dragster. The FED normally ran around 11.3, but the stars aligned for this run. He beat a red-motored powered T-bucket in this round, but was beaten in the subsequent round.

The grey had been taken out to 3.25” bore (155ci), running 12.5:1 Repco pistons with full floating pins. Factory cylinder head, ported and oversized red motor valves with home-made pedestal roller rockers. Lightened steel flywheel and large harmonic balancer. Bert Jones cam. Triple 1½” SUs on alky. Bosch twin-point dizzy. Standard rods, sand blasted (similar to shot peining in intent). Standard crank, balanced with main cap braces. Custom HV oil pump using Holden 308 gears. All-synchro 3-speed using only second and top. Shortened banjo running a 4.1:1 fine spline centre.

I have absolutely no reason to doubt Dennis’ story, as the background, equipment and era match up (some stories I hear about other grey powered records do not stack up for power/weight). I’d be interested though if anyone has either records from the track (unlikely), or if there was any magazine coverage of the event.

Cheers,
Harv
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jeffa
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Re: Holden grey motor speed/power record holders

Post by jeffa »

Thanks for keeping the updates coming Harv.
Watching with interest. I had a Grey in my FC many years ago. Blew it up when one of the oil pump gears split in two and snapped the tongue off the distributer drive. Engine kept going. Didn't notice the feeble oil light...
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thatold.chevy
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Re: Holden grey motor speed/power record holders

Post by thatold.chevy »

You'd be wanting a fat (like 20mm plate) mains girdle and probably a half-grout-filled block up to the bottom of the water pump inlet.

i'd also be drilling, tapping and connecting the oil mains galleries between all cylinders with brake bundy or similar to equalise oil pressure front to back.

i hate shared inlet ports personally - high power sixes should be able to treat the front 3 cylinders like one engine, and the rear three like another - so don't run triples but BIG double SUs or jetted up 97s - you'll get the lower RPM torque you need without sacrificing top end. each carb will see hit-miss-hit-miss-hit-miss and your mid-range volumetric efficiency will improve.

the repco crossflow head use twin carbs for this very reason and splits the engine into two 3cyl for tuning.

if you don't do something about the shared inlet ports, then i'd suggest fuel injection (mechanical or electronic depending on how period you want to be). the shared exhaust ports also make it very difficult to properly tune the same hit-miss needed for a proper 3-2-1 system.

grey motors are proper econobox, low stress motors - like the early (pre 36) stovebolts - although the blue-flame motors of that era have hop-up ideas that directly translate to the little grey motor.

even a roller-profile longer duration / lower lift cam is better than the old school high lift and snap shut profiles.

but it's nothing that a good dose of boost can't fix - "flow and this and that" goes out the window once 4psi + starts being forced down it's throat.

either that or chuck an LPG barra in it with headers and a tune for low 200HP and something that doesn't strip ring gears off your flywheel when starting.
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Re: Holden grey motor speed/power record holders

Post by Harv »

The build is fairly serious so far for a grey.

Virgin crank crack tested and girdled, , crank throws machined to swap float control so that big end floats and small end is located by pistons. Ross SFI balancer with crank drilled and tapped for retainer. Lightened steel SFI flywheel. Eagle Mitsubishi H-beam rods, custom forged slugs to bring it to 9.5:1 static. Two-stage dry sump and custom pan, though unsure yet if the weight gain is worth the power... may run wet sump. Clive custom ground cam from two different profiles to maximise duration whilst minimising overlap. Steel timing gear. EJ block for the larger mains and distributor oiling. Block taken out to 3.25" bore (155ci), static water jacketed (no pump) but not grouted. Repco head and roller rockers to prevent exhaust valve walk. Head loctited. Stainless 1.5" zoomies. Norman 110 huffer running 10psi suckthrough. McGee fuel injection specifically made by Hedley for the Repco head. Vertex magneto locked out and fettled for higher amps. All ARP fasteners with the exception of the countersunk engine plate screws. Shorty slide-and-glide worked over by Al's Race Glides. Dominator 5000rpm convertor, SFI blanket. Shorted Hilux diff, 4.7:1 and spooled, 28" MT slicks. May need to run nitrous over the boost, but can only do so in IHRA (not ANDRA) tracks.

Cheers,
Harv
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zuffen
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Re: Holden grey motor speed/power record holders

Post by zuffen »

That sounds like a cheap sort of build.

Seriously you've got some good gear there and I hope it all works out and you can hit your target.
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