coventry climax V8

[KemppiFrog]

If I had to shift stuck pistons I would clamp a fat steel plate across the cylinder with a hole in it for a hydraulic fitting, fill the cylinder to the top with oil, screw in a fitting and pump the piston out with a porta-power type pump.

I liked that idea, but then thought about how few pistons can be pulled out of the bottom of the bore (in my limited experiece) I once did it for an MG PA that we couldn't find a head gasket for. But since then?

Also intrigued about the flat heads. Would that be a cost thing? Or development of the bowl in piston idea? It might be common in diesels, but back then, not so much in performance engines (Didn't know about the Jag V12)

 

[bill_gj]

I thought that performance V8s almost always had chamber-in-head. Flat faced heads were a way of cheapening the head manufacturing for mass produced engines and gave the pistons too much mass when the chamber went into the crown.

 

[lotus 30]

If I had to shift stuck pistons I would clamp a fat steel plate across the cylinder with a hole in it for a hydraulic fitting, fill the cylinder to the top with oil, screw in a fitting and pump the piston out with a porta-power type pump.

i decided against that as it is a ali block and there is not another one if it cracks. the liners are only thin cast iron and there is a waterway between the cylinders so not a lot of strength there also the pistons had to come out the top of the liner the webbing in the block would not allow the piston past.

 

[lotus 30]

From my visit to climax engine services today. These engines were to run on Gas Diesel petrol so all the compression was to be dealt with in the piston crown. I was lucky enough to find some exhaust valves the will do the job with a bigger valve shim on the top. These engines were to be produced in 2cyl 4cyl and v8 it is a 90 deg block. The cylinder heads can be fitted on other bank of the block to make them universal.My engine was running in a generator and on gas so it is low comp

 

[KemppiFrog]

EEk! Good luck...

 

[Pete.]

I'd babbitt a slide hammer fixing in there and try to drift them out.

 

[ronan]

Could the old liners not be bored out with a boring head in a mill ? Or enough meat taken out of them to get them to collapse.

 

[lotus 30]

Got em all out posted the pic so you could see what i had to deal with never damaged a piston and got 5 liners out in one piece but they are not usable to much corrosion

 

[ronan]

Didn't realize the pistons were stuck, an old trick i have heard of thats supposedly never failed, is very hot olive oil chucked down the bores.

 

[bill_gj]

Clever design. Proud to be Britsh, donchaknow.