Stroker block clearance

[Riceburner]

I'm building a stroker up at the moment and I have read about potential block clearance issues. I'm running an LD crank, Datsun spirit light weight 139.5mm rods and Pistons.

 

I noticed when I tore down an LD engine that the block had been clearanced by the factory (see pics). It appeared to be the main oil gallery. What sort of clearance to the block is sufficient for an engine at high RPM and how thick will the gallery walls be?

 

Cheers, Gareth.

[dat2kman]

Only way to find out is to dummy assemble crank and rods into blck, and check.

Die grind only where needed, and the minimum of amount.

[Scoota G]

I read the title and thought you were selling a bunch of them LOL!

[luvemfast]

^^^^^^^^^^

This guy! 

[Riceburner]

Hahaha, I wish!

 

Yeah I am doing a dummy assembly to see if any other bits will cause an issue.

 

In terms of clearance, is 1mm ok or would 3mm be better incase anything stretches under load. I was wondering if there is a specific minimum clearance measurement.

[Gordo]

Hey Gareth, is your car going ATM . Or is this the motor that you are working on?  Cheers.

[Riceburner]

Gordo, no unfortunately not. It's in bits and pieces again 

 

Regarding numbers on clearance I found this http://www.zcar.com/forum/10-70-83-tech-discussion-forum/277137-stroker-rod-bolt-clearance.html

 

It's says "0.080 to 0.100" clearance through full arc of rotation" So that's what I'll check for.

 

 

 

 

[dat2kman]

2 to 2.5 mm f clearance hey!

Must be some movement going on, unless it's girdled,,,,,

 

( actually there is, at 1.0 mm clearancing, there is evidence of touching marks on a smoothly ground and painted interior surface, from the big end caps! Bit of walking going on, no girdle fitted,,,,,)