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  #16 (permalink)  
Old 05-07-2013, 12:39 AM
the youngone
 

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I looked in the piston skirt and found numbers. .. 1260p1 does it say anything?

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  #17 (permalink)  
Old 05-07-2013, 02:27 AM
the youngone
 

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And if i measure the. Skirt its 4.026377952760254 inches
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Old 05-07-2013, 03:38 AM
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Sounds like a +.030" oversize block.

Whoops now we gots a prob.. can't have a 3.99" bore and a 4.026" piston. Better re check sizes. 4.026377952760254 inches won't slide in a 3.998425196854712 in. hole.. Not even with a really big hammer..

Last edited by BOBCRMAN@aol.com; 05-07-2013 at 03:52 AM.
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Old 05-07-2013, 04:16 AM
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Where do you measure the piston .. Skirt?
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Old 05-07-2013, 04:30 AM
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Across the skirt at, or just below, the piston pin centerline..

Also is the piston no. on the bottom of the dome or on the inside skirt? Sometimes will determine if piston is cast or forged. Actually a pic of inside piston and I can determine material/construction.
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Old 05-07-2013, 04:23 PM
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Some measurments

I measure te cilinder bore. Of the block wit a special tool. And it was 4.030708661421676 inches The piston i will measure it tomorro . But it slides in the bore . Also i have rust ! And a scratch. Dont know it its ghone with honin .. What do you say
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Old 05-07-2013, 04:25 PM
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Pics

Here pics from the. Scratch and the rust in the walls
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Old 05-07-2013, 04:27 PM
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Pic of scratch

Can i remove the scratch with the hone stone?
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Old 05-07-2013, 04:29 PM
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Scratch

I can only post 1 pic at te time ..
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Old 05-07-2013, 05:54 PM
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I worry about the rust more than the scratch.. Biggest problem will be that of trying to maintain bore size. Remember the more the cylinder is honed, the more loose the piston gets..

If you are like most. You have a budget for this build. On a purely street engine. MINOR rust pits won't be noticed much, if at, all while running. Nor will the scratch. A small bit of oil consumption between changes. For a few thousand miles, till the bores wear some.

Performance/race and the remaining minor rust pits and scratch will cause compression leakage. Oil contamination of a hot combustion chamber. Detonation. Worse oil use. Blue exhaust smoke. Power loss.

Several other options $$$ including. Knurl piston shirt and hone cylinder .002-.005 "to fit. Hone block to .040" and new pistons/rings. Sleeve the offending hole back to fresh .030". Tho this will distort the adjacent bores some.

You pays your money and takes your choice!
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Old 05-07-2013, 06:51 PM
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Originally Posted by Wezz View Post
and can u guys see of the block is milled.. its looks like a milling pattern ..? can i chek is its already bored over?
How the hell did the bores get so rusty and yet the decks look like they were milled ten minutes ago???

In any event, the deck surface finish is important to how (or if) the head gasket seals. Too rough isn't good and no, I cannot tell you if that deck finish is OK or not. If I had to guess I'd say it's prollably OK for a composite type gasket, not so much for a MLS.
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Old 05-07-2013, 07:32 PM
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The bore does not seem to be stock. A stock 350 bore should be right about 4.000. You measured at just over 4.030. You measured the piston at just under 4.030. The piston, you say, fits the bore. Bobcrman is right. This is a .030 overbore.

PatM

Edit:did you just delete a post?
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  #28 (permalink)  
Old 05-07-2013, 08:13 PM
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Uhm no didnt. Remove a post .. Te decks are look like it becouse i. Cleaned it with gasoline and 500 grit sandingpaper.. Now the isea of what i want from this engine. It is a few years project . So it can cost some money. I would like to get 400 hp out of it .

But so the engine is already 0.30 over .. Whats the next size . In combination. And what is a good set of nee pistons . And what wil it cost.
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Old 05-07-2013, 08:32 PM
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Quote:
Originally Posted by Wezz View Post
Uhm no didnt. Remove a post .. Te decks are look like it becouse i. Cleaned it with gasoline and 500 grit sandingpaper.. Now the isea of what i want from this engine. It is a few years project . So it can cost some money. I would like to get 400 hp out of it .

But so the engine is already 0.30 over .. Whats the next size . In combination. And what is a good set of nee pistons . And what wil it cost.
Next size is .040 as stated. 400 hp can use hypereutectic piston. Design depends on cylinder heads, camshaft and fuel quality.
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  #30 (permalink)  
Old 05-07-2013, 10:31 PM
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Ok But first k try it with this bore .. Anyone tryd a hand hone ?
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