Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

cast cranks... How much can they take
Posted by: hoffbug
Date: July 23, 2008 07:57PM

Ive never been a fan of cast cranks.. Just how much abuse can the Buick 300 or an offset ground Rover 4.6 crank take?
Do you think it could handle up to 13 to 1 compression and 7000 RPM?

are there any forged options other than the wildcat items?

. I understand these are Ford 302 rough castings that are finished to Rover specs..
Do you think I could have one made in the US?



Edited 1 time(s). Last edit at 07/23/2008 07:58PM by hoffbug.


NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: cast cranks... How much can they take
Posted by: NixVegaGT
Date: July 24, 2008 12:02PM

I like the Ford crank idea. I wonder if they sell a bare forging of the 347 stroke (3.4"). That would be cool. That said: I haven't heard of someone breaking a cast crank in our engines but there are a lot less guys running this engine than the SBC. Right?

I'd like to see where the Ford crank takes you though. Interesting. I got your phone message late yesterday BTW. I'm working on the Vega tonight though…


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: cast cranks... How much can they take
Posted by: BlownMGB-V8
Date: July 24, 2008 12:08PM

The SBB guys (350 mostly) go above 700 hp on the cast crank and I think one car at least is in the 1000 hp range. Haven't heard of the cranks being a problem. Mostly they want better heads, intakes, head gaskets, you know, stuff to make more power. Though there is a project in the works to make a block girdle.

Jim
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crashbash
david bash
st. charles
(215 posts)

Registered:
01/28/2008 10:53AM

Main British Car:
1979 MGB Rdst V8 project, 1968 MGC GT, 1969 MGB Rd olds 215

Re: cast cranks... How much can they take
Posted by: crashbash
Date: September 09, 2008 02:06PM

Any idea if this block girdle project has been completed? Doesn't sound like cast crank should be much of an issue. Just tying it down well.


Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:
Re: cast cranks... How much can they take
Posted by: Wotland
Date: September 10, 2008 08:53AM

crashbash Wrote:
-------------------------------------------------------
> Any idea if this block girdle project has been
> completed? Doesn't sound like cast crank
> should be much of an issue. Just tying it down
> well.

Do you speak of just an alloy girdle plate or block sump girdle ?
http://i20.servimg.com/u/f20/11/14/83/96/sump_g12.jpg


NixVegaGT
Nicolas Wiederhold
Minneapolis, MN
(659 posts)

Registered:
10/16/2007 05:30AM

Main British Car:
'73 Vega GT 4.9L Rover/Buick Stroker

authors avatar
Re: cast cranks... How much can they take
Posted by: NixVegaGT
Date: September 11, 2008 11:52AM

Are you going to use that, Dimitri? Where did you get it again? I think I remember you saying that it was a spare part from a race team?


Wotland
Wotland Wotland

(105 posts)

Registered:
01/07/2008 08:14AM

Main British Car:
Re: cast cranks... How much can they take
Posted by: Wotland
Date: September 12, 2008 06:32AM

It is one of the four Block Sump girdle who waren made by Janspeed - ADA for the Triumph TR8 Biturbo LeMans.
The engine delivered an power of 475BHP. [www.tr7smeets.centerall.com]
Two block sump girdles waren used by Janspeed-ADA (one for the LeMans project and the other in one TR7 for rallycross).
One sump was sent to TVR and the last to Wildcat (Ian Richardson).
I bought it last year from an guy in UK.



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