Martini X Engine build Started

[cozzoi]

Finally the process begun, I will dedicate one day a week for this project
and will report it weekly with pics
-1500 engine with all standard clearances-done
-cleaned and honed-done
-Complete ported, milled and Big valve head- done
-Camshaft with 11.97mm lift- done
-Main bearing and Crankshaft installation- done (except for one missing main bearing bolt) waiting for some Xweb member to get me one.
-Original pistons with Total Seal Gapless Top ring set- done
-Grind pistons to make room for big valves- not yet, can accept suggestions

 

[ianlawson]

Quick question from...........!!

-Original pistons with Total Seal Gapless Top ring set- done

........."old-school" auto mechanic!
How do you fit 'gapless' piston rings over the crown of the piston?? This has had me puzzled since I first heard of these here on XWeb!! :hmm:

cheers, Ian - NZ

 

[Dr.Auto]

The same as regular rings. Difference being.... for the compression ring there are multiple rings in the same land. And when off set from each other in the same land become "gap-less". Refer to the close up pic of piston with rings installed and notice that there are two rings installed in the same land where the single compression ring would normally go.

It's not anymore difficult than fitting the oil control rings.

 

[fiatfactory]

Tipo cylinder head.....

SteveC

 

[cozzoi]

a lot accomplished in the last 2 days

Piston's flycut for big valves & Polished DONE
Volume measurement of cylinder chambers. DONE
Volume measurement of Piston dome. DONE
Check for interference. DONE

Results:

Cylinder Bore size: 86.4

Piston Stroke Length: 63.75

Combustion Chamber volume : 28 cc

Dished Piston volume : 5 cc

Above Piston deck clearance: 0.076

Compressed Gasket Thickness: 1mm

Calculated CR with the above gasket: 10.4 to 1 ??

This is going to be an interference engine.

 

[jjay911]

Wow......................Simply pornographic:italia::italia::italia::italia::italia::italia::italia::italia:

 

[jasco]

OK, I've never seen any of this done. It looks like you are grinding the piston tops to clear larger valves. Are you using a power rotary device, or are you doing it by hand power alone? How do you get all of the pistons the same? Lots of shiny aluminum. Looks awesome! I truly admire you guys that know what you are doing.

 

[bertone9]

Welly welly welly George

This engine rebuild/upgrade 102 for me, I did a few others long ago, but this is Xtreme makeover dude. Yeah!:clap:
I'm learning everytime I look at this forum.
Welly welly welly, George (and friend) you're taking this puppy to Concorso, Eh?
Buona Fortuna Che!

 

[cozzoi]

Hand guided rotary tool and Patterns used to flycut pistons

Pattern used to check roundness and deepness at all times.
Some courage needed to begin, some stress medicine during the process and champagne to celebrate after you are done with the polishing.

 

[CALMOTION]

Tools of the trade

Nice to have the right tools to get things started plus the mind set/knowledge. Are specs similar to what Matt had provided and are you looking at 100HP or more? Great job..Nicely documented

 

[Diabolic]

Hi George Aspron Bracco

What are those rims? How big and how wide are they?
How much do these wheels and where do you get them?

 

[fiatmonkey]

Pattern used to check roundness and deepness at all times.
Some courage needed to begin, some stress medicine during the process and champagne to celebrate after you are done with the polishing.

Well done. I remember reading the PBS "how to" to relieve the pistons for the bigger intake valves and I was like "huh??? No fricken way!" But I also got up the courage and had at it. Took a few clay-tests for me to get it within acceptable margin but all worked out in the end.

Very cool!

 

[Mark]

Those are some "ginormous" cam lobes!

 

[Fred pinczuk]

Very nice!:nod:

 

[cozzoi]

Rims

15x7 front
15x8 rear
all 80mm backspace
Steel rims MRW
http://www.rockcrawler-mrt.com/OFFROADERS OFF ROAD WHEELS buy MRW.html

 

[fiatfactory]

Those are some "ginormous" cam lobes!

They certainly are...I don't see any mention of valve spring coil bind checks in the above build... beware, unless the valves / valve springs have been properly set up for this high lift, you'll damage the cam lobes in no time flat if the springs bind....

Damn those are heavy wheels too... * 24lbs and 26lbs each...thats like 11 and 12kg per wheel!

SteveC

 

[Alex]

Wow

That is just awesome. Keep posting those pic’s.

Someone once said that this is an addiction (I believe it was “Black-Tooth”)…. and I want more….

 

[cozzoi]

cam lobes and springs, interesting question

I don't know the specs on the valve springs, but I actually drove the Fiat Uno with this cylinder head and cam installed on it. It was amazingly fast. (1.6 liter) I brought the head already assembled and I intend to plug and play it.

 

[lookforjoe]

Great pics & documentation!

Just curious - I assume the piston & rings weren't installed with the ring gaps aligned as they were in the photo?

How did you determine that the change in piston weight was uniform across all four?

 

[cozzoi]

piston weight

Yes, I weight all pistons and weight was pretty uniform. Good point!
Rings were aligned as recommended by Total Seal.