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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
Posted by: djw090
Date: March 02, 2012 07:05AM

"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?


Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:


Re: RV8 Custom crank
Posted by: Wotland
Date: March 02, 2012 08:28AM

I had the confirmation Terrier used steel forged crank by an ex JRA engineer.


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"
Posted by: roverman
Date: March 02, 2012 12:28PM

Since we're chasing rainbows, why not the forged Iceberg cranks for the deisel conversion of the RV8 ?


rrrover 5L
John Caine
Australia
(28 posts)

Registered:
08/16/2010 08:44AM

Main British Car:


authors avatar
Re: RV8 Custom crank
Posted by: rrrover 5L
Date: March 07, 2012 06:56AM

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.
Posted by: roverman
Date: March 07, 2012 11:42AM

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.


Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:


Re: RV8 Custom crank
Posted by: Wotland
Date: March 08, 2012 03:22AM

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.


rrrover 5L
John Caine
Australia
(28 posts)

Registered:
08/16/2010 08:44AM

Main British Car:


authors avatar
Re: RV8 Custom crank
Posted by: rrrover 5L
Date: March 08, 2012 06:28AM

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



jfjfjf2
Julian Fussell
Somerset
(17 posts)

Registered:
02/18/2012 01:00PM

Main British Car:
TVR Griffith '94 RV8 5ltr

Re: RV8 Custom crank
Posted by: jfjfjf2
Date: March 08, 2012 08:18AM

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
Posted by: roverman
Date: March 08, 2012 06:46PM

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.


Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:


Re: RV8 Custom crank
Posted by: Wotland
Date: March 09, 2012 06:33AM

SBF SVO have it also on #3 no ?


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 ?
Posted by: roverman
Date: March 09, 2012 11:20AM

Sbf, I do belive. This aids in using the sbf raw forgings for sbb/rover cranks. roverman.


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
Posted by: roverman
Date: March 09, 2012 02:14PM

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.


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

authors avatar
Re: RV8 Custom crank
Posted by: BlownMGB-V8
Date: March 09, 2012 03:39PM

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 ?
Posted by: roverman
Date: March 09, 2012 04:45PM

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.


Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:


Re: RV8 Custom crank
Posted by: Wotland
Date: March 10, 2012 02:38AM

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.



Greg55_99
Greg Williams

(101 posts)

Registered:
11/01/2007 07:12PM

Main British Car:


Re: RV8 Custom crank
Posted by: Greg55_99
Date: March 12, 2012 01:19PM

A Buick 350 crank won't "bang" a P76 block. Well, not so much with stock Buick rods anyway...

http://forum.britishv8.org/file.php?6,file=2336

Greg


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
Posted by: roverman
Date: March 12, 2012 06:37PM

Greg, Bravo ! Appears to have same pan width as regular rover ? What are the mains sized at ?


Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:


Re: RV8 Custom crank
Posted by: Wotland
Date: March 13, 2012 07:29AM

P76 main bearing size is actually 2.5495" .

Yes same pan width as regular rover.


rrrover 5L
John Caine
Australia
(28 posts)

Registered:
08/16/2010 08:44AM

Main British Car:


authors avatar
Re: RV8 Custom crank
Posted by: rrrover 5L
Date: March 13, 2012 08:07AM

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.
Posted by: roverman
Date: March 13, 2012 11:38AM

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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