BritishV8 Forum

General Category => Engine, Transmission, & Rear Axle assy. => Topic started by: hoffbug on July 23, 2008, 07:57:54 PM

Title: cast cranks... How much can they take
Post by: hoffbug on July 23, 2008, 07:57:54 PM
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?
Title: Re: cast cranks... How much can they take
Post by: NixVegaGT on July 24, 2008, 12:02:35 PM
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...
Title: Re: cast cranks... How much can they take
Post by: BlownMGB-V8 on July 24, 2008, 12:08:25 PM
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
Title: Re: cast cranks... How much can they take
Post by: crashbash on September 09, 2008, 02:06:55 PM
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.
Title: Re: cast cranks... How much can they take
Post by: Wotland on September 10, 2008, 08:53:53 AM
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) (http://www.servimg.com/image_preview.php?i=56&u=11148396)
Title: Re: cast cranks... How much can they take
Post by: NixVegaGT on September 11, 2008, 11:52:05 AM
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?
Title: Re: cast cranks... How much can they take
Post by: Wotland on September 12, 2008, 06:32:22 AM
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. http://www.tr7smeets.centerall.com/page267_4.php
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.