Piston - Cylinder Clearance

Hi guys.... My engine builder has the block stripped and has started getting the bores ready for the new pistons. He does have a question that I can't answer. How much clearance from the pistons to the bores? He's thinking a few thou, but we all want to be sure. 3/1000's of an inch? 5/1000's of an inch? What say the masters of all things X? As always, thanks.

I guess I should add that its a 1300 engine

Check page 10-64 in manual

Look at page 10-64 in the "Connecting Rods and Pistons" section of the online manual:

http://www.socalx.com/xhelp/X1-9_101-05_10-63.pdf

I "think" it has the measurements you are looking for, but I am not one of the experts.

many thanks.

I'll print those few pages and bring them in. I think this might be for a 1500, but I'm sure its the same for the 1300. Hopefully, others will chime in and confirm. Thanks...

As the online manual says ... 0.030 - 0.050 mm (*)

(*) measured 27.5mm down from the crown (borgo pistons) or 20mm (Mondial pistons) (this footnote is in the X19 five speed shop manual)

SteveC

Just for more info - 1300 section

I scanned the similar section from my 74-78 shop manual so you can compare the specs. The last page is a little crooked, but has all the info.

What I have seen

If you are building a stock engine and keeping it that way go for the min. Clearance. But if you are changing a camshaft, upping the compression, changing anything to obtain more performance then I would go to the higher side of the spec.

This engine bakes back there and pushing it causes the clearance to shrink up just a bit too much and scoring can occur in the bore. Pushing the hell out of the engine is a blast, but then getting stuck in stop and go traffic on a hot summer day, isn't for this engine with tight fitting bores.

TonyK.

Grimsby Ontario Canada.

Many thanks....

I'll print all this out and bring it to the engine shop first thing in the morning.