Re: Navarro six, block weirdness

[farna@xxxxxxx]

It depends on the thickness of the pistons -- mainly the skirts and how much is behind the bottom of the ring grooves. I doubt they can be ground down 0.10" though. Looks like you'll need to order custom pistons or bore the block. Is the block CAST that thick or does it have sleeves? Will be hard to tell if the block was decked after the sleeves were installed, and it likely was. For high boost a heavy cylinder wall is preferred. IIRC Navarro was running 20+ psi in the Indy engine. I think there was a limit on boost. I also seem to recall reading that he started running at high boost then the rules changed to limit boost to a lower amount before the engine was actually run in any races. 

On July 15, 2005 Tom Jennings wrote:

> This Navarro block, the bore is undersize. I measured it three
> times.
> 
> 3.595" diameter, all concentric, no ridge or damage. Weird. Makes
> for some damn thick cylinder walls though!!
> 
> So none of the pistons I have are from this motor -- they're all
> 3.75" (well, they measure 3.735").
> 
> Can forged pistons be reground? They have practically zero hours
> on them.  I've got nine stock diameter Venolia forged 199 pistons.
> 
> Found all the wrist pins plus a dozen extras (floating type) and
> 2X solid lifters and adjustable pushrods.


=============================================================
Posted by wixList Archiver -- http://www.amxfiles.com/wixlist