djw090 David Witham Warwick UK (115 posts) Registered: 06/12/2008 11:20AM Main British Car: MGB 1974 and MG ZT 160 turbo 2005 |
Re: RV8 Custom crank
"Terrier truck crank is steel forged"
That is an interesting comment. The Leyland Terrier was manufactured in the UK and is listed as using the 4.4L version of the RV8. That size was only otherwise used in Australia with local maufacture. Earlier posters have indicated the Australian engines to have cast cranks. If the Terrier was using engines brought in from Australia you might expect it to use the same crank. However, you could understand it having a special crank if it was an "odd" size being made in the UK just for the Terrier. Does anyone have any information on this? |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: RV8 Custom crank, project "Iceberg"
Since we're chasing rainbows, why not the forged Iceberg cranks for the deisel conversion of the RV8 ?
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Re: RV8 Custom crank
David, having stripped many Terrier engines in search of the mythical forged crank, I'm yet to find one:-(
Leyland used to quote a part number and price of $1300.00 for them in the late 70's, but understandably, no takers. Terrier engines were distinguished from P76 one's by red as opposed to blue rocker covers. Somewhat ironically, Leyland Australia closed an MGB manufacturing & assembly line in 1972 to make the P76.... Art, most if not all of those Iceberg cranks were purchased by Vitesse developments here in Melbourne in 1988 and used in 4.2 conversions mainly fitted to brand new Range Rovers. The chap who ran this business's name escapes me, but I think he returned to UK. I have one of these cars & did think the crank had a forged & hardened appearance at the flange end when I replaced a flex plate...Never had the sump off...I did enquire with one of the Vitesse employees whether it was a forging & he said no, but if they are, then there's plenty around...Might have to buy a whole car though....They were fitted with Motec ecu, too. If someone has connections with an ex Rover special projects employee, it may be possible to get some more information on this. cheers, John |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: RV8 Custom crank, straight ahead.
Nothing diverts forward momentum like a well placed tangent. That being said, the "sample" 4.6L rover crank is being shiped to Scat, this week. Meanwhile, I shall make a basic dimensional drawing. Onward, roverman.
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Re: RV8 Custom crank
John,
You speak of John Smith. It is the ex JRA engineer who told me Terrrier crank is forged. John now lives in Uk at Newry (Nothern Ireland). Now about "Iceberg crank", I have one used in Tuscan Challenge engine. It is just cast in better molecular structure. Cheers. |
Re: RV8 Custom crank
Hmmm, next time I come across a Terrier engine I'll take a REALLY critical look at the crank....Maybe I've mistaken a parting line for a molding line.
That being said, Leyland sponsored John Mc Cormack's Leyland powered F5000 efforts out here back in the 70's and I'm fairly sure they had Laystall make cranks due to lack of off the shelf forging?? A friend has the Elfin MR7 car. The ex F1 McLaren version which won the Formula 5000 series here ended up back in UK as an F1 again. Legendary engineer Phil Irving had input into engine and cylinder head development for these cars. Several sets of "Heron" heads were produced,too. Cheers John |
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jfjfjf2 Julian Fussell Somerset (17 posts) Registered: 02/18/2012 01:00PM Main British Car: TVR Griffith '94 RV8 5ltr |
Re: RV8 Custom crank
Art - Good news about crank to Scat, thanks for stepping into the breach. I got the crank out of my old engine but the cost of sending it over and retrieving it with the possibility of it being a wild goose chase is prohibitive. I was just about to order from over here but I'll hold off for now. Cross over manifold arrived today, now have to decide on throttle bodies.
Julian |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: RV8 Custom crank, locating the thrust bearing
Why did they put it "there" ? Rover V8's and sbb's have it on #3. This happens to be the "nodal" area of the crank as far as power pulse/torsional deflections. I suspect this why Buick/Olds engineers chose #3 to reduce flange wear, do to harmonics. The flip side of this is, all of the pressure plate clamp load is transfered to this area, when clutch is disengaged. This means a zigzag loading of up to 3k lbs. tranfers back to flywheel. Sbc, on the other hand has thrust bearing at #5. Perhaps for this reason ? Cheers, roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: RV8 Custom crank/ sbf ?
Sbf, I do belive. This aids in using the sbf raw forgings for sbb/rover cranks. roverman.
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: RV8 Custom crank + a dummy crank
John C. You "might" want to grind a junker 340/350,(3.7" stroke) sbb crank to a Honda journal size, to check your block clearance issues ? As I think about this, you could easily "fab" a plastic/alum. dummy/ partial crank,(2 mains,2 rod's), just for clearance checking. Rover's are narrower at the pan rail than sbb's. Good Luck, roverman.
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BlownMGB-V8 Jim Blackwood 9406 Gunpowder Rd., Florence, KY 41042 (6468 posts) Registered: 10/23/2007 12:59PM Main British Car: 1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS |
Re: RV8 Custom crank
Don't know about pan rail clearance but cam lobe clearance is the usual issue. It gets real tight with aftermarket rods.
Jim |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: RV8 Custom crank, Q-lite ?
Jim and clan, Your speaking of 3.850" stroke with 2.0" rod journals ? Not a good option for Rover V8. As we have seen, 300 block is better suited for this much stroke. I suspect even a 3.7" stroke with a 2" journal will "bang" a rover block. Most folks springing for a forged custom crank, will want lot's of rev. potential. BadAssed torque is 455 territory. Onward, roverman.
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Re: RV8 Custom crank
Art, in UK Rob Robertson at V8D built 5.5 RV8 with a stroke of 3.7" for a bore of 3.8" with 5.7" small journal SBC rods. Crank is full counterweight cast and can rev happy to 6500RPM. Cheers.
Edited 1 time(s). Last edit at 03/10/2012 02:40AM by Wotland. |
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roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: RV8 Custom crank
Greg, Bravo ! Appears to have same pan width as regular rover ? What are the mains sized at ?
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Re: RV8 Custom crank
STD P76 rods are decent forgings, too....Good for 6500 in road use...A shot peen & some ARP bolts wouldn't hurt, either.
Do you have a 4.0/4.6 block to try that crank in? 3.7 bore + 3.850 stroke would give 5.4L?? |
roverman Art Gertz Winchester, CA. (3188 posts) Registered: 04/24/2009 11:02AM Main British Car: 74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L |
Re: RV8 Custom crank, 10lb crank, 5 lb sack.
John, too many tangients already. Not a good swap IMHO. 3" mains down to 2.5" ? Deck way too short, piston skirts will bang counterweights. Poor rod ratio/etc. 300 iron block is better suited. Just ask Jim B., our resident task master of sbb;s. Onward, roverman.
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