Pobjoy Counterweighted T4 Crank for a new project!

Craig Torrens · 2006-08-29T12:24:53+00:00

I thought I would show a photo of my Pobjoy T4 counterweighted crank for my next project !! The motor will be around 2.2lt with a short stroke and big bore combo.:P [ Edited on 29-8-2006 by Craig Torrens ] [ Edited on 29-8-2006 by Craig Torrens ]

BrisDubba Fahrvergnugen

877 posts · joined Oct 2005 · 13 Oct 2007, 10:01 am

#616293

Yep will be interesting to see how it goes - but Nick you gotta get out more boy !!

bond wrote:cool thread craig - look forward to watching the build. keep the pics comming.

sexy pistons!

nick

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amazeer Bishop of Volkswagenism

3,029 posts · joined Nov 2005 · 16 Oct 2007, 12:31 pm

#616789

You need some new pistons, those ones have big holes in the top. I suspect there was a bit of valve float in the old engine. You shouldnt use stock springs over 6750rpm.

Beetspeed Slammed & Awesome Dubber

75 posts · joined Nov 2004 · 25 Nov 2007, 7:19 am

#622114

amazeer wrote:You need some new pistons, those ones have big holes in the top. I suspect there was a bit of valve float in the old engine. You shouldnt use stock springs over 6750rpm.

😂

I am going to try a 66x103 also, but will put a turbo to it as well 😎
The 66mm cranks are extemely strong by itself; I won't have counterweights welded to it myself, but will use lightenend rods with 22mm pin and light pistons too ;-)

'75 1303 'Renner' 2.2 T4 turbo

amazeer Bishop of Volkswagenism

3,029 posts · joined Nov 2005 · 25 Nov 2007, 8:55 am

#622125

get a cut off wheel on your angle grinder and cut some grooves around the main bearing journals. You'll get better lubrication above 6 psi.

LOWBUG Insano Dub Head

738 posts · joined Jul 2003 · 26 Nov 2007, 6:01 pm

#622379

I was a little confused at the begining of this post, as I thought a T4 crank was from a five cylinder water cooled engine but I understand now.

Craig Torrens 6 times Australian, 7 times State Hillclimb Class Champion

8,040 posts · joined Jan 2003 · 26 Nov 2007, 7:47 pm

#622396

oooops sorry !